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/*!
* Knockout JavaScript library v3.3.0
* (c) Steven Sanderson - http://knockoutjs.com/
* License: MIT (http://www.opensource.org/licenses/mit-license.php)
*/
(function(){
var DEBUG=true;
(function(undefined){
// (0, eval)('this') is a robust way of getting a reference to the global object
// For details, see http://stackoverflow.com/questions/14119988/return-this-0-evalthis/14120023#14120023
var window = this || (0, eval)('this'),
document = window['document'],
navigator = window['navigator'],
jQueryInstance = window["jQuery"],
JSON = window["JSON"];
(function(factory) {
// Support three module loading scenarios
if (typeof define === 'function' && define['amd']) {
// [1] AMD anonymous module
define(['exports', 'require'], factory);
} else if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
// [2] CommonJS/Node.js
factory(module['exports'] || exports); // module.exports is for Node.js
} else {
// [3] No module loader (plain <script> tag) - put directly in global namespace
factory(window['ko'] = {});
}
}(function(koExports, amdRequire){
// Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler).
// In the future, the following "ko" variable may be made distinct from "koExports" so that private objects are not externally reachable.
var ko = typeof koExports !== 'undefined' ? koExports : {};
// Google Closure Compiler helpers (used only to make the minified file smaller)
ko.exportSymbol = function(koPath, object) {
var tokens = koPath.split(".");
// In the future, "ko" may become distinct from "koExports" (so that non-exported objects are not reachable)
// At that point, "target" would be set to: (typeof koExports !== "undefined" ? koExports : ko)
var target = ko;
for (var i = 0; i < tokens.length - 1; i++)
target = target[tokens[i]];
target[tokens[tokens.length - 1]] = object;
};
ko.exportProperty = function(owner, publicName, object) {
owner[publicName] = object;
};
ko.version = "3.3.0";
ko.exportSymbol('version', ko.version);
ko.utils = (function () {
function objectForEach(obj, action) {
for (var prop in obj) {
if (obj.hasOwnProperty(prop)) {
action(prop, obj[prop]);
}
}
}
function extend(target, source) {
if (source) {
for(var prop in source) {
if(source.hasOwnProperty(prop)) {
target[prop] = source[prop];
}
}
}
return target;
}
function setPrototypeOf(obj, proto) {
obj.__proto__ = proto;
return obj;
}
var canSetPrototype = ({ __proto__: [] } instanceof Array);
// Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup)
var knownEvents = {}, knownEventTypesByEventName = {};
var keyEventTypeName = (navigator && /Firefox\/2/i.test(navigator.userAgent)) ? 'KeyboardEvent' : 'UIEvents';
knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress'];
knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave'];
objectForEach(knownEvents, function(eventType, knownEventsForType) {
if (knownEventsForType.length) {
for (var i = 0, j = knownEventsForType.length; i < j; i++)
knownEventTypesByEventName[knownEventsForType[i]] = eventType;
}
});
var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406
// Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness)
// Note that, since IE 10 does not support conditional comments, the following logic only detects IE < 10.
// Currently this is by design, since IE 10+ behaves correctly when treated as a standard browser.
// If there is a future need to detect specific versions of IE10+, we will amend this.
var ieVersion = document && (function() {
var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i');
// Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment
while (
div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->',
iElems[0]
) {}
return version > 4 ? version : undefined;
}());
var isIe6 = ieVersion === 6,
isIe7 = ieVersion === 7;
function isClickOnCheckableElement(element, eventType) {
if ((ko.utils.tagNameLower(element) !== "input") || !element.type) return false;
if (eventType.toLowerCase() != "click") return false;
var inputType = element.type;
return (inputType == "checkbox") || (inputType == "radio");
}
// For details on the pattern for changing node classes
// see: https://github.com/knockout/knockout/issues/1597
var cssClassNameRegex = /\S+/g;
function toggleDomNodeCssClass(node, classNames, shouldHaveClass) {
var addOrRemoveFn;
if (classNames) {
if (typeof node.classList === 'object') {
addOrRemoveFn = node.classList[shouldHaveClass ? 'add' : 'remove'];
ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {
addOrRemoveFn.call(node.classList, className);
});
} else if (typeof node.className['baseVal'] === 'string') {
// SVG tag .classNames is an SVGAnimatedString instance
toggleObjectClassPropertyString(node.className, 'baseVal', classNames, shouldHaveClass);
} else {
// node.className ought to be a string.
toggleObjectClassPropertyString(node, 'className', classNames, shouldHaveClass);
}
}
}
function toggleObjectClassPropertyString(obj, prop, classNames, shouldHaveClass) {
// obj/prop is either a node/'className' or a SVGAnimatedString/'baseVal'.
var currentClassNames = obj[prop].match(cssClassNameRegex) || [];
ko.utils.arrayForEach(classNames.match(cssClassNameRegex), function(className) {
ko.utils.addOrRemoveItem(currentClassNames, className, shouldHaveClass);
});
obj[prop] = currentClassNames.join(" ");
}
return {
fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],
arrayForEach: function (array, action) {
for (var i = 0, j = array.length; i < j; i++)
action(array[i], i);
},
arrayIndexOf: function (array, item) {
if (typeof Array.prototype.indexOf == "function")
return Array.prototype.indexOf.call(array, item);
for (var i = 0, j = array.length; i < j; i++)
if (array[i] === item)
return i;
return -1;
},
arrayFirst: function (array, predicate, predicateOwner) {
for (var i = 0, j = array.length; i < j; i++)
if (predicate.call(predicateOwner, array[i], i))
return array[i];
return null;
},
arrayRemoveItem: function (array, itemToRemove) {
var index = ko.utils.arrayIndexOf(array, itemToRemove);
if (index > 0) {
array.splice(index, 1);
}
else if (index === 0) {
array.shift();
}
},
arrayGetDistinctValues: function (array) {
array = array || [];
var result = [];
for (var i = 0, j = array.length; i < j; i++) {
if (ko.utils.arrayIndexOf(result, array[i]) < 0)
result.push(array[i]);
}
return result;
},
arrayMap: function (array, mapping) {
array = array || [];
var result = [];
for (var i = 0, j = array.length; i < j; i++)
result.push(mapping(array[i], i));
return result;
},
arrayFilter: function (array, predicate) {
array = array || [];
var result = [];
for (var i = 0, j = array.length; i < j; i++)
if (predicate(array[i], i))
result.push(array[i]);
return result;
},
arrayPushAll: function (array, valuesToPush) {
if (valuesToPush instanceof Array)
array.push.apply(array, valuesToPush);
else
for (var i = 0, j = valuesToPush.length; i < j; i++)
array.push(valuesToPush[i]);
return array;
},
addOrRemoveItem: function(array, value, included) {
var existingEntryIndex = ko.utils.arrayIndexOf(ko.utils.peekObservable(array), value);
if (existingEntryIndex < 0) {
if (included)
array.push(value);
} else {
if (!included)
array.splice(existingEntryIndex, 1);
}
},
canSetPrototype: canSetPrototype,
extend: extend,
setPrototypeOf: setPrototypeOf,
setPrototypeOfOrExtend: canSetPrototype ? setPrototypeOf : extend,
objectForEach: objectForEach,
objectMap: function(source, mapping) {
if (!source)
return source;
var target = {};
for (var prop in source) {
if (source.hasOwnProperty(prop)) {
target[prop] = mapping(source[prop], prop, source);
}
}
return target;
},
emptyDomNode: function (domNode) {
while (domNode.firstChild) {
ko.removeNode(domNode.firstChild);
}
},
moveCleanedNodesToContainerElement: function(nodes) {
// Ensure it's a real array, as we're about to reparent the nodes and
// we don't want the underlying collection to change while we're doing that.
var nodesArray = ko.utils.makeArray(nodes);
var templateDocument = (nodesArray[0] && nodesArray[0].ownerDocument) || document;
var container = templateDocument.createElement('div');
for (var i = 0, j = nodesArray.length; i < j; i++) {
container.appendChild(ko.cleanNode(nodesArray[i]));
}
return container;
},
cloneNodes: function (nodesArray, shouldCleanNodes) {
for (var i = 0, j = nodesArray.length, newNodesArray = []; i < j; i++) {
var clonedNode = nodesArray[i].cloneNode(true);
newNodesArray.push(shouldCleanNodes ? ko.cleanNode(clonedNode) : clonedNode);
}
return newNodesArray;
},
setDomNodeChildren: function (domNode, childNodes) {
ko.utils.emptyDomNode(domNode);
if (childNodes) {
for (var i = 0, j = childNodes.length; i < j; i++)
domNode.appendChild(childNodes[i]);
}
},
replaceDomNodes: function (nodeToReplaceOrNodeArray, newNodesArray) {
var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;
if (nodesToReplaceArray.length > 0) {
var insertionPoint = nodesToReplaceArray[0];
var parent = insertionPoint.parentNode;
for (var i = 0, j = newNodesArray.length; i < j; i++)
parent.insertBefore(newNodesArray[i], insertionPoint);
for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {
ko.removeNode(nodesToReplaceArray[i]);
}
}
},
fixUpContinuousNodeArray: function(continuousNodeArray, parentNode) {
// Before acting on a set of nodes that were previously outputted by a template function, we have to reconcile
// them against what is in the DOM right now. It may be that some of the nodes have already been removed, or that
// new nodes might have been inserted in the middle, for example by a binding. Also, there may previously have been
// leading comment nodes (created by rewritten string-based templates) that have since been removed during binding.
// So, this function translates the old "map" output array into its best guess of the set of current DOM nodes.
//
// Rules:
// [A] Any leading nodes that have been removed should be ignored
// These most likely correspond to memoization nodes that were already removed during binding
// See https://github.com/SteveSanderson/knockout/pull/440
// [B] We want to output a continuous series of nodes. So, ignore any nodes that have already been removed,
// and include any nodes that have been inserted among the previous collection
if (continuousNodeArray.length) {
// The parent node can be a virtual element; so get the real parent node
parentNode = (parentNode.nodeType === 8 && parentNode.parentNode) || parentNode;
// Rule [A]
while (continuousNodeArray.length && continuousNodeArray[0].parentNode !== parentNode)
continuousNodeArray.splice(0, 1);
// Rule [B]
if (continuousNodeArray.length > 1) {
var current = continuousNodeArray[0], last = continuousNodeArray[continuousNodeArray.length - 1];
// Replace with the actual new continuous node set
continuousNodeArray.length = 0;
while (current !== last) {
continuousNodeArray.push(current);
current = current.nextSibling;
if (!current) // Won't happen, except if the developer has manually removed some DOM elements (then we're in an undefined scenario)
return;
}
continuousNodeArray.push(last);
}
}
return continuousNodeArray;
},
setOptionNodeSelectionState: function (optionNode, isSelected) {
// IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.
if (ieVersion < 7)
optionNode.setAttribute("selected", isSelected);
else
optionNode.selected = isSelected;
},
stringTrim: function (string) {
return string === null || string === undefined ? '' :
string.trim ?
string.trim() :
string.toString().replace(/^[\s\xa0]+|[\s\xa0]+$/g, '');
},
stringStartsWith: function (string, startsWith) {
string = string || "";
if (startsWith.length > string.length)
return false;
return string.substring(0, startsWith.length) === startsWith;
},
domNodeIsContainedBy: function (node, containedByNode) {
if (node === containedByNode)
return true;
if (node.nodeType === 11)
return false; // Fixes issue #1162 - can't use node.contains for document fragments on IE8
if (containedByNode.contains)
return containedByNode.contains(node.nodeType === 3 ? node.parentNode : node);
if (containedByNode.compareDocumentPosition)
return (containedByNode.compareDocumentPosition(node) & 16) == 16;
while (node && node != containedByNode) {
node = node.parentNode;
}
return !!node;
},
domNodeIsAttachedToDocument: function (node) {
return ko.utils.domNodeIsContainedBy(node, node.ownerDocument.documentElement);
},
anyDomNodeIsAttachedToDocument: function(nodes) {
return !!ko.utils.arrayFirst(nodes, ko.utils.domNodeIsAttachedToDocument);
},
tagNameLower: function(element) {
// For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case.
// Possible future optimization: If we know it's an element from an XHTML document (not HTML),
// we don't need to do the .toLowerCase() as it will always be lower case anyway.
return element && element.tagName && element.tagName.toLowerCase();
},
registerEventHandler: function (element, eventType, handler) {
var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType];
if (!mustUseAttachEvent && jQueryInstance) {
jQueryInstance(element)['bind'](eventType, handler);
} else if (!mustUseAttachEvent && typeof element.addEventListener == "function")
element.addEventListener(eventType, handler, false);
else if (typeof element.attachEvent != "undefined") {
var attachEventHandler = function (event) { handler.call(element, event); },
attachEventName = "on" + eventType;
element.attachEvent(attachEventName, attachEventHandler);
// IE does not dispose attachEvent handlers automatically (unlike with addEventListener)
// so to avoid leaks, we have to remove them manually. See bug #856
ko.utils.domNodeDisposal.addDisposeCallback(element, function() {
element.detachEvent(attachEventName, attachEventHandler);
});
} else
throw new Error("Browser doesn't support addEventListener or attachEvent");
},
triggerEvent: function (element, eventType) {
if (!(element && element.nodeType))
throw new Error("element must be a DOM node when calling triggerEvent");
// For click events on checkboxes and radio buttons, jQuery toggles the element checked state *after* the
// event handler runs instead of *before*. (This was fixed in 1.9 for checkboxes but not for radio buttons.)
// IE doesn't change the checked state when you trigger the click event using "fireEvent".
// In both cases, we'll use the click method instead.
var useClickWorkaround = isClickOnCheckableElement(element, eventType);
if (jQueryInstance && !useClickWorkaround) {
jQueryInstance(element)['trigger'](eventType);
} else if (typeof document.createEvent == "function") {
if (typeof element.dispatchEvent == "function") {
var eventCategory = knownEventTypesByEventName[eventType] || "HTMLEvents";
var event = document.createEvent(eventCategory);
event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);
element.dispatchEvent(event);
}
else
throw new Error("The supplied element doesn't support dispatchEvent");
} else if (useClickWorkaround && element.click) {
element.click();
} else if (typeof element.fireEvent != "undefined") {
element.fireEvent("on" + eventType);
} else {
throw new Error("Browser doesn't support triggering events");
}
},
unwrapObservable: function (value) {
return ko.isObservable(value) ? value() : value;
},
peekObservable: function (value) {
return ko.isObservable(value) ? value.peek() : value;
},
toggleDomNodeCssClass: toggleDomNodeCssClass,
setTextContent: function(element, textContent) {
var value = ko.utils.unwrapObservable(textContent);
if ((value === null) || (value === undefined))
value = "";
// We need there to be exactly one child: a text node.
// If there are no children, more than one, or if it's not a text node,
// we'll clear everything and create a single text node.
var innerTextNode = ko.virtualElements.firstChild(element);
if (!innerTextNode || innerTextNode.nodeType != 3 || ko.virtualElements.nextSibling(innerTextNode)) {
ko.virtualElements.setDomNodeChildren(element, [element.ownerDocument.createTextNode(value)]);
} else {
innerTextNode.data = value;
}
ko.utils.forceRefresh(element);
},
setElementName: function(element, name) {
element.name = name;
// Workaround IE 6/7 issue
// - https://github.com/SteveSanderson/knockout/issues/197
// - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/
if (ieVersion <= 7) {
try {
element.mergeAttributes(document.createElement("<input name='" + element.name + "'/>"), false);
}
catch(e) {} // For IE9 with doc mode "IE9 Standards" and browser mode "IE9 Compatibility View"
}
},
forceRefresh: function(node) {
// Workaround for an IE9 rendering bug - https://github.com/SteveSanderson/knockout/issues/209
if (ieVersion >= 9) {
// For text nodes and comment nodes (most likely virtual elements), we will have to refresh the container
var elem = node.nodeType == 1 ? node : node.parentNode;
if (elem.style)
elem.style.zoom = elem.style.zoom;
}
},
ensureSelectElementIsRenderedCorrectly: function(selectElement) {
// Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width.
// (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option)
// Also fixes IE7 and IE8 bug that causes selects to be zero width if enclosed by 'if' or 'with'. (See issue #839)
if (ieVersion) {
var originalWidth = selectElement.style.width;
selectElement.style.width = 0;
selectElement.style.width = originalWidth;
}
},
range: function (min, max) {
min = ko.utils.unwrapObservable(min);
max = ko.utils.unwrapObservable(max);
var result = [];
for (var i = min; i <= max; i++)
result.push(i);
return result;
},
makeArray: function(arrayLikeObject) {
var result = [];
for (var i = 0, j = arrayLikeObject.length; i < j; i++) {
result.push(arrayLikeObject[i]);
};
return result;
},
isIe6 : isIe6,
isIe7 : isIe7,
ieVersion : ieVersion,
getFormFields: function(form, fieldName) {
var fields = ko.utils.makeArray(form.getElementsByTagName("input")).concat(ko.utils.makeArray(form.getElementsByTagName("textarea")));
var isMatchingField = (typeof fieldName == 'string')
? function(field) { return field.name === fieldName }
: function(field) { return fieldName.test(field.name) }; // Treat fieldName as regex or object containing predicate
var matches = [];
for (var i = fields.length - 1; i >= 0; i--) {
if (isMatchingField(fields[i]))
matches.push(fields[i]);
};
return matches;
},
parseJson: function (jsonString) {
if (typeof jsonString == "string") {
jsonString = ko.utils.stringTrim(jsonString);
if (jsonString) {
if (JSON && JSON.parse) // Use native parsing where available
return JSON.parse(jsonString);
return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers
}
}
return null;
},
stringifyJson: function (data, replacer, space) { // replacer and space are optional
if (!JSON || !JSON.stringify)
throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js");
return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space);
},
postJson: function (urlOrForm, data, options) {
options = options || {};
var params = options['params'] || {};
var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;
var url = urlOrForm;
// If we were given a form, use its 'action' URL and pick out any requested field values
if((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === "form")) {
var originalForm = urlOrForm;
url = originalForm.action;
for (var i = includeFields.length - 1; i >= 0; i--) {
var fields = ko.utils.getFormFields(originalForm, includeFields[i]);
for (var j = fields.length - 1; j >= 0; j--)
params[fields[j].name] = fields[j].value;
}
}
data = ko.utils.unwrapObservable(data);
var form = document.createElement("form");
form.style.display = "none";
form.action = url;
form.method = "post";
for (var key in data) {
// Since 'data' this is a model object, we include all properties including those inherited from its prototype
var input = document.createElement("input");
input.type = "hidden";
input.name = key;
input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));
form.appendChild(input);
}
objectForEach(params, function(key, value) {
var input = document.createElement("input");
input.type = "hidden";
input.name = key;
input.value = value;
form.appendChild(input);
});
document.body.appendChild(form);
options['submitter'] ? options['submitter'](form) : form.submit();
setTimeout(function () { form.parentNode.removeChild(form); }, 0);
}
}
}());
ko.exportSymbol('utils', ko.utils);
ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach);
ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst);
ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter);
ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);
ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf);
ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap);
ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll);
ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem);
ko.exportSymbol('utils.extend', ko.utils.extend);
ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);
ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields);
ko.exportSymbol('utils.peekObservable', ko.utils.peekObservable);
ko.exportSymbol('utils.postJson', ko.utils.postJson);
ko.exportSymbol('utils.parseJson', ko.utils.parseJson);
ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler);
ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson);
ko.exportSymbol('utils.range', ko.utils.range);
ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);
ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent);
ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable);
ko.exportSymbol('utils.objectForEach', ko.utils.objectForEach);
ko.exportSymbol('utils.addOrRemoveItem', ko.utils.addOrRemoveItem);
ko.exportSymbol('utils.setTextContent', ko.utils.setTextContent);
ko.exportSymbol('unwrap', ko.utils.unwrapObservable); // Convenient shorthand, because this is used so commonly
if (!Function.prototype['bind']) {
// Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)
// In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js
Function.prototype['bind'] = function (object) {
var originalFunction = this;
if (arguments.length === 1) {
return function () {
return originalFunction.apply(object, arguments);
};
} else {
var partialArgs = Array.prototype.slice.call(arguments, 1);
return function () {
var args = partialArgs.slice(0);
args.push.apply(args, arguments);
return originalFunction.apply(object, args);
};
}
};
}
ko.utils.domData = new (function () {
var uniqueId = 0;
var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
var dataStore = {};
function getAll(node, createIfNotFound) {
var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null") && dataStore[dataStoreKey];
if (!hasExistingDataStore) {
if (!createIfNotFound)
return undefined;
dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;
dataStore[dataStoreKey] = {};
}
return dataStore[dataStoreKey];
}
return {
get: function (node, key) {
var allDataForNode = getAll(node, false);
return allDataForNode === undefined ? undefined : allDataForNode[key];
},
set: function (node, key, value) {
if (value === undefined) {
// Make sure we don't actually create a new domData key if we are actually deleting a value
if (getAll(node, false) === undefined)
return;
}
var allDataForNode = getAll(node, true);
allDataForNode[key] = value;
},
clear: function (node) {
var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
if (dataStoreKey) {
delete dataStore[dataStoreKey];
node[dataStoreKeyExpandoPropertyName] = null;
return true; // Exposing "did clean" flag purely so specs can infer whether things have been cleaned up as intended
}
return false;
},
nextKey: function () {
return (uniqueId++) + dataStoreKeyExpandoPropertyName;
}
};
})();
ko.exportSymbol('utils.domData', ko.utils.domData);
ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully
ko.utils.domNodeDisposal = new (function () {
var domDataKey = ko.utils.domData.nextKey();
var cleanableNodeTypes = { 1: true, 8: true, 9: true }; // Element, Comment, Document
var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document
function getDisposeCallbacksCollection(node, createIfNotFound) {
var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);
if ((allDisposeCallbacks === undefined) && createIfNotFound) {
allDisposeCallbacks = [];
ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);
}
return allDisposeCallbacks;
}
function destroyCallbacksCollection(node) {
ko.utils.domData.set(node, domDataKey, undefined);
}
function cleanSingleNode(node) {
// Run all the dispose callbacks
var callbacks = getDisposeCallbacksCollection(node, false);
if (callbacks) {
callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)
for (var i = 0; i < callbacks.length; i++)
callbacks[i](node);
}
// Erase the DOM data
ko.utils.domData.clear(node);
// Perform cleanup needed by external libraries (currently only jQuery, but can be extended)
ko.utils.domNodeDisposal["cleanExternalData"](node);
// Clear any immediate-child comment nodes, as these wouldn't have been found by
// node.getElementsByTagName("*") in cleanNode() (comment nodes aren't elements)
if (cleanableNodeTypesWithDescendants[node.nodeType])
cleanImmediateCommentTypeChildren(node);
}
function cleanImmediateCommentTypeChildren(nodeWithChildren) {
var child, nextChild = nodeWithChildren.firstChild;
while (child = nextChild) {
nextChild = child.nextSibling;
if (child.nodeType === 8)
cleanSingleNode(child);
}
}
return {
addDisposeCallback : function(node, callback) {
if (typeof callback != "function")
throw new Error("Callback must be a function");
getDisposeCallbacksCollection(node, true).push(callback);
},
removeDisposeCallback : function(node, callback) {
var callbacksCollection = getDisposeCallbacksCollection(node, false);
if (callbacksCollection) {
ko.utils.arrayRemoveItem(callbacksCollection, callback);
if (callbacksCollection.length == 0)
destroyCallbacksCollection(node);
}
},
cleanNode : function(node) {
// First clean this node, where applicable
if (cleanableNodeTypes[node.nodeType]) {
cleanSingleNode(node);
// ... then its descendants, where applicable
if (cleanableNodeTypesWithDescendants[node.nodeType]) {
// Clone the descendants list in case it changes during iteration
var descendants = [];
ko.utils.arrayPushAll(descendants, node.getElementsByTagName("*"));
for (var i = 0, j = descendants.length; i < j; i++)
cleanSingleNode(descendants[i]);
}
}
return node;
},
removeNode : function(node) {
ko.cleanNode(node);
if (node.parentNode)
node.parentNode.removeChild(node);
},
"cleanExternalData" : function (node) {
// Special support for jQuery here because it's so commonly used.
// Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData
// so notify it to tear down any resources associated with the node & descendants here.
if (jQueryInstance && (typeof jQueryInstance['cleanData'] == "function"))
jQueryInstance['cleanData']([node]);
}
};
})();
ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience
ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience
ko.exportSymbol('cleanNode', ko.cleanNode);
ko.exportSymbol('removeNode', ko.removeNode);
ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal);
ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);
ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);
(function () {
var leadingCommentRegex = /^(\s*)<!--(.*?)-->/;
function simpleHtmlParse(html, documentContext) {
documentContext || (documentContext = document);
var windowContext = documentContext['parentWindow'] || documentContext['defaultView'] || window;
// Based on jQuery's "clean" function, but only accounting for table-related elements.
// If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly
// Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of
// a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>"
// This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node
// (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.
// Trim whitespace, otherwise indexOf won't work as expected
var tags = ko.utils.stringTrim(html).toLowerCase(), div = documentContext.createElement("div");
// Finds the first match from the left column, and returns the corresponding "wrap" data from the right column
var wrap = tags.match(/^<(thead|tbody|tfoot)/) && [1, "<table>", "</table>"] ||
!tags.indexOf("<tr") && [2, "<table><tbody>", "</tbody></table>"] ||
(!tags.indexOf("<td") || !tags.indexOf("<th")) && [3, "<table><tbody><tr>", "</tr></tbody></table>"] ||
/* anything else */ [0, "", ""];
// Go to html and back, then peel off extra wrappers
// Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.
var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>";
if (typeof windowContext['innerShiv'] == "function") {
div.appendChild(windowContext['innerShiv'](markup));
} else {
div.innerHTML = markup;
}
// Move to the right depth
while (wrap[0]--)
div = div.lastChild;
return ko.utils.makeArray(div.lastChild.childNodes);
}
function jQueryHtmlParse(html, documentContext) {
// jQuery's "parseHTML" function was introduced in jQuery 1.8.0 and is a documented public API.
if (jQueryInstance['parseHTML']) {
return jQueryInstance['parseHTML'](html, documentContext) || []; // Ensure we always return an array and never null
} else {
// For jQuery < 1.8.0, we fall back on the undocumented internal "clean" function.
var elems = jQueryInstance['clean']([html], documentContext);
// As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.
// Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.
// Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.
if (elems && elems[0]) {
// Find the top-most parent element that's a direct child of a document fragment
var elem = elems[0];
while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)
elem = elem.parentNode;
// ... then detach it
if (elem.parentNode)
elem.parentNode.removeChild(elem);
}
return elems;
}
}
ko.utils.parseHtmlFragment = function(html, documentContext) {
return jQueryInstance ? jQueryHtmlParse(html, documentContext) // As below, benefit from jQuery's optimisations where possible
: simpleHtmlParse(html, documentContext); // ... otherwise, this simple logic will do in most common cases.
};
ko.utils.setHtml = function(node, html) {
ko.utils.emptyDomNode(node);
// There's no legitimate reason to display a stringified observable without unwrapping it, so we'll unwrap it
html = ko.utils.unwrapObservable(html);
if ((html !== null) && (html !== undefined)) {
if (typeof html != 'string')
html = html.toString();
// jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,
// for example <tr> elements which are not normally allowed to exist on their own.
// If you've referenced jQuery we'll use that rather than duplicating its code.
if (jQueryInstance) {
jQueryInstance(node)['html'](html);
} else {
// ... otherwise, use KO's own parsing logic.
var parsedNodes = ko.utils.parseHtmlFragment(html, node.ownerDocument);
for (var i = 0; i < parsedNodes.length; i++)
node.appendChild(parsedNodes[i]);
}
}
};
})();
ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);
ko.exportSymbol('utils.setHtml', ko.utils.setHtml);
ko.memoization = (function () {
var memos = {};
function randomMax8HexChars() {
return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);
}
function generateRandomId() {
return randomMax8HexChars() + randomMax8HexChars();
}
function findMemoNodes(rootNode, appendToArray) {
if (!rootNode)
return;
if (rootNode.nodeType == 8) {
var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);
if (memoId != null)
appendToArray.push({ domNode: rootNode, memoId: memoId });
} else if (rootNode.nodeType == 1) {
for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)
findMemoNodes(childNodes[i], appendToArray);
}
}
return {
memoize: function (callback) {
if (typeof callback != "function")
throw new Error("You can only pass a function to ko.memoization.memoize()");
var memoId = generateRandomId();
memos[memoId] = callback;
return "<!--[ko_memo:" + memoId + "]-->";
},
unmemoize: function (memoId, callbackParams) {
var callback = memos[memoId];
if (callback === undefined)
throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized.");
try {
callback.apply(null, callbackParams || []);
return true;
}
finally { delete memos[memoId]; }
},
unmemoizeDomNodeAndDescendants: function (domNode, extraCallbackParamsArray) {
var memos = [];
findMemoNodes(domNode, memos);
for (var i = 0, j = memos.length; i < j; i++) {
var node = memos[i].domNode;
var combinedParams = [node];
if (extraCallbackParamsArray)
ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);
ko.memoization.unmemoize(memos[i].memoId, combinedParams);
node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again
if (node.parentNode)
node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)
}
},
parseMemoText: function (memoText) {
var match = memoText.match(/^\[ko_memo\:(.*?)\]$/);
return match ? match[1] : null;
}
};
})();
ko.exportSymbol('memoization', ko.memoization);
ko.exportSymbol('memoization.memoize', ko.memoization.memoize);
ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize);
ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText);
ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);
ko.extenders = {
'throttle': function(target, timeout) {
// Throttling means two things:
// (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies
// notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate
target['throttleEvaluation'] = timeout;
// (2) For writable targets (observables, or writable dependent observables), we throttle *writes*
// so the target cannot change value synchronously or faster than a certain rate
var writeTimeoutInstance = null;
return ko.dependentObservable({
'read': target,
'write': function(value) {
clearTimeout(writeTimeoutInstance);
writeTimeoutInstance = setTimeout(function() {
target(value);
}, timeout);
}
});
},
'rateLimit': function(target, options) {
var timeout, method, limitFunction;
if (typeof options == 'number') {
timeout = options;
} else {
timeout = options['timeout'];
method = options['method'];
}
limitFunction = method == 'notifyWhenChangesStop' ? debounce : throttle;
target.limit(function(callback) {
return limitFunction(callback, timeout);
});
},
'notify': function(target, notifyWhen) {
target["equalityComparer"] = notifyWhen == "always" ?
null : // null equalityComparer means to always notify
valuesArePrimitiveAndEqual;
}
};
var primitiveTypes = { 'undefined':1, 'boolean':1, 'number':1, 'string':1 };
function valuesArePrimitiveAndEqual(a, b) {
var oldValueIsPrimitive = (a === null) || (typeof(a) in primitiveTypes);
return oldValueIsPrimitive ? (a === b) : false;
}
function throttle(callback, timeout) {
var timeoutInstance;
return function () {
if (!timeoutInstance) {
timeoutInstance = setTimeout(function() {
timeoutInstance = undefined;
callback();
}, timeout);
}
};
}
function debounce(callback, timeout) {
var timeoutInstance;
return function () {
clearTimeout(timeoutInstance);
timeoutInstance = setTimeout(callback, timeout);
};
}
function applyExtenders(requestedExtenders) {
var target = this;
if (requestedExtenders) {
ko.utils.objectForEach(requestedExtenders, function(key, value) {
var extenderHandler = ko.extenders[key];
if (typeof extenderHandler == 'function') {
target = extenderHandler(target, value) || target;
}
});
}
return target;
}
ko.exportSymbol('extenders', ko.extenders);
ko.subscription = function (target, callback, disposeCallback) {
this._target = target;
this.callback = callback;
this.disposeCallback = disposeCallback;
this.isDisposed = false;
ko.exportProperty(this, 'dispose', this.dispose);
};
ko.subscription.prototype.dispose = function () {
this.isDisposed = true;
this.disposeCallback();
};
ko.subscribable = function () {
ko.utils.setPrototypeOfOrExtend(this, ko.subscribable['fn']);
this._subscriptions = {};
this._versionNumber = 1;
}
var defaultEvent = "change";
var ko_subscribable_fn = {
subscribe: function (callback, callbackTarget, event) {
var self = this;
event = event || defaultEvent;
var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;
var subscription = new ko.subscription(self, boundCallback, function () {
ko.utils.arrayRemoveItem(self._subscriptions[event], subscription);
if (self.afterSubscriptionRemove)
self.afterSubscriptionRemove(event);
});
if (self.beforeSubscriptionAdd)
self.beforeSubscriptionAdd(event);
if (!self._subscriptions[event])
self._subscriptions[event] = [];
self._subscriptions[event].push(subscription);
return subscription;
},
"notifySubscribers": function (valueToNotify, event) {
event = event || defaultEvent;
if (event === defaultEvent) {
this.updateVersion();
}
if (this.hasSubscriptionsForEvent(event)) {
try {
ko.dependencyDetection.begin(); // Begin suppressing dependency detection (by setting the top frame to undefined)
for (var a = this._subscriptions[event].slice(0), i = 0, subscription; subscription = a[i]; ++i) {
// In case a subscription was disposed during the arrayForEach cycle, check
// for isDisposed on each subscription before invoking its callback
if (!subscription.isDisposed)
subscription.callback(valueToNotify);
}
} finally {
ko.dependencyDetection.end(); // End suppressing dependency detection
}
}
},
getVersion: function () {
return this._versionNumber;
},
hasChanged: function (versionToCheck) {
return this.getVersion() !== versionToCheck;
},
updateVersion: function () {
++this._versionNumber;
},
limit: function(limitFunction) {
var self = this, selfIsObservable = ko.isObservable(self),
isPending, previousValue, pendingValue, beforeChange = 'beforeChange';
if (!self._origNotifySubscribers) {
self._origNotifySubscribers = self["notifySubscribers"];
self["notifySubscribers"] = function(value, event) {
if (!event || event === defaultEvent) {
self._rateLimitedChange(value);
} else if (event === beforeChange) {
self._rateLimitedBeforeChange(value);
} else {
self._origNotifySubscribers(value, event);
}
};
}
var finish = limitFunction(function() {
// If an observable provided a reference to itself, access it to get the latest value.
// This allows computed observables to delay calculating their value until needed.
if (selfIsObservable && pendingValue === self) {
pendingValue = self();
}
isPending = false;
if (self.isDifferent(previousValue, pendingValue)) {
self._origNotifySubscribers(previousValue = pendingValue);
}
});
self._rateLimitedChange = function(value) {
isPending = true;
pendingValue = value;
finish();
};
self._rateLimitedBeforeChange = function(value) {
if (!isPending) {
previousValue = value;
self._origNotifySubscribers(value, beforeChange);
}
};
},
hasSubscriptionsForEvent: function(event) {
return this._subscriptions[event] && this._subscriptions[event].length;
},
getSubscriptionsCount: function (event) {
if (event) {
return this._subscriptions[event] && this._subscriptions[event].length || 0;
} else {
var total = 0;
ko.utils.objectForEach(this._subscriptions, function(eventName, subscriptions) {
total += subscriptions.length;
});
return total;
}
},
isDifferent: function(oldValue, newValue) {
return !this['equalityComparer'] || !this['equalityComparer'](oldValue, newValue);
},
extend: applyExtenders
};
ko.exportProperty(ko_subscribable_fn, 'subscribe', ko_subscribable_fn.subscribe);
ko.exportProperty(ko_subscribable_fn, 'extend', ko_subscribable_fn.extend);
ko.exportProperty(ko_subscribable_fn, 'getSubscriptionsCount', ko_subscribable_fn.getSubscriptionsCount);
// For browsers that support proto assignment, we overwrite the prototype of each
// observable instance. Since observables are functions, we need Function.prototype
// to still be in the prototype chain.
if (ko.utils.canSetPrototype) {
ko.utils.setPrototypeOf(ko_subscribable_fn, Function.prototype);
}
ko.subscribable['fn'] = ko_subscribable_fn;
ko.isSubscribable = function (instance) {
return instance != null && typeof instance.subscribe == "function" && typeof instance["notifySubscribers"] == "function";
};
ko.exportSymbol('subscribable', ko.subscribable);
ko.exportSymbol('isSubscribable', ko.isSubscribable);
ko.computedContext = ko.dependencyDetection = (function () {
var outerFrames = [],
currentFrame,
lastId = 0;
// Return a unique ID that can be assigned to an observable for dependency tracking.
// Theoretically, you could eventually overflow the number storage size, resulting
// in duplicate IDs. But in JavaScript, the largest exact integral value is 2^53
// or 9,007,199,254,740,992. If you created 1,000,000 IDs per second, it would
// take over 285 years to reach that number.
// Reference http://blog.vjeux.com/2010/javascript/javascript-max_int-number-limits.html
function getId() {
return ++lastId;
}
function begin(options) {
outerFrames.push(currentFrame);
currentFrame = options;
}
function end() {
currentFrame = outerFrames.pop();
}
return {
begin: begin,
end: end,
registerDependency: function (subscribable) {
if (currentFrame) {
if (!ko.isSubscribable(subscribable))
throw new Error("Only subscribable things can act as dependencies");
currentFrame.callback(subscribable, subscribable._id || (subscribable._id = getId()));
}
},
ignore: function (callback, callbackTarget, callbackArgs) {
try {
begin();
return callback.apply(callbackTarget, callbackArgs || []);
} finally {
end();
}
},
getDependenciesCount: function () {
if (currentFrame)
return currentFrame.computed.getDependenciesCount();
},
isInitial: function() {
if (currentFrame)
return currentFrame.isInitial;
}
};
})();
ko.exportSymbol('computedContext', ko.computedContext);
ko.exportSymbol('computedContext.getDependenciesCount', ko.computedContext.getDependenciesCount);
ko.exportSymbol('computedContext.isInitial', ko.computedContext.isInitial);
ko.exportSymbol('computedContext.isSleeping', ko.computedContext.isSleeping);
ko.exportSymbol('ignoreDependencies', ko.ignoreDependencies = ko.dependencyDetection.ignore);
ko.observable = function (initialValue) {
var _latestValue = initialValue;
function observable() {
if (arguments.length > 0) {
// Write
// Ignore writes if the value hasn't changed
if (observable.isDifferent(_latestValue, arguments[0])) {
observable.valueWillMutate();
_latestValue = arguments[0];
if (DEBUG) observable._latestValue = _latestValue;
observable.valueHasMutated();
}
return this; // Permits chained assignments
}
else {
// Read
ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation
return _latestValue;
}
}
ko.subscribable.call(observable);
ko.utils.setPrototypeOfOrExtend(observable, ko.observable['fn']);
if (DEBUG) observable._latestValue = _latestValue;
observable.peek = function() { return _latestValue };
observable.valueHasMutated = function () { observable["notifySubscribers"](_latestValue); }
observable.valueWillMutate = function () { observable["notifySubscribers"](_latestValue, "beforeChange"); }
ko.exportProperty(observable, 'peek', observable.peek);
ko.exportProperty(observable, "valueHasMutated", observable.valueHasMutated);
ko.exportProperty(observable, "valueWillMutate", observable.valueWillMutate);
return observable;
}
ko.observable['fn'] = {
"equalityComparer": valuesArePrimitiveAndEqual
};
var protoProperty = ko.observable.protoProperty = "__ko_proto__";
ko.observable['fn'][protoProperty] = ko.observable;
// Note that for browsers that don't support proto assignment, the
// inheritance chain is created manually in the ko.observable constructor
if (ko.utils.canSetPrototype) {
ko.utils.setPrototypeOf(ko.observable['fn'], ko.subscribable['fn']);
}
ko.hasPrototype = function(instance, prototype) {
if ((instance === null) || (instance === undefined) || (instance[protoProperty] === undefined)) return false;
if (instance[protoProperty] === prototype) return true;
return ko.hasPrototype(instance[protoProperty], prototype); // Walk the prototype chain
};
ko.isObservable = function (instance) {
return ko.hasPrototype(instance, ko.observable);
}
ko.isWriteableObservable = function (instance) {
// Observable
if ((typeof instance == "function") && instance[protoProperty] === ko.observable)
return true;
// Writeable dependent observable
if ((typeof instance == "function") && (instance[protoProperty] === ko.dependentObservable) && (instance.hasWriteFunction))
return true;
// Anything else
return false;
}
ko.exportSymbol('observable', ko.observable);
ko.exportSymbol('isObservable', ko.isObservable);
ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable);
ko.exportSymbol('isWritableObservable', ko.isWriteableObservable);
ko.observableArray = function (initialValues) {
initialValues = initialValues || [];
if (typeof initialValues != 'object' || !('length' in initialValues))
throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");
var result = ko.observable(initialValues);
ko.utils.setPrototypeOfOrExtend(result, ko.observableArray['fn']);
return result.extend({'trackArrayChanges':true});
};
ko.observableArray['fn'] = {
'remove': function (valueOrPredicate) {
var underlyingArray = this.peek();
var removedValues = [];
var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
for (var i = 0; i < underlyingArray.length; i++) {
var value = underlyingArray[i];
if (predicate(value)) {
if (removedValues.length === 0) {
this.valueWillMutate();
}
removedValues.push(value);
underlyingArray.splice(i, 1);
i--;
}
}
if (removedValues.length) {
this.valueHasMutated();
}
return removedValues;
},
'removeAll': function (arrayOfValues) {
// If you passed zero args, we remove everything
if (arrayOfValues === undefined) {
var underlyingArray = this.peek();
var allValues = underlyingArray.slice(0);
this.valueWillMutate();
underlyingArray.splice(0, underlyingArray.length);
this.valueHasMutated();
return allValues;
}
// If you passed an arg, we interpret it as an array of entries to remove
if (!arrayOfValues)
return [];
return this['remove'](function (value) {
return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
});
},
'destroy': function (valueOrPredicate) {
var underlyingArray = this.peek();
var predicate = typeof valueOrPredicate == "function" && !ko.isObservable(valueOrPredicate) ? valueOrPredicate : function (value) { return value === valueOrPredicate; };
this.valueWillMutate();
for (var i = underlyingArray.length - 1; i >= 0; i--) {
var value = underlyingArray[i];
if (predicate(value))
underlyingArray[i]["_destroy"] = true;
}
this.valueHasMutated();
},
'destroyAll': function (arrayOfValues) {
// If you passed zero args, we destroy everything
if (arrayOfValues === undefined)
return this['destroy'](function() { return true });
// If you passed an arg, we interpret it as an array of entries to destroy
if (!arrayOfValues)
return [];
return this['destroy'](function (value) {
return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
});
},
'indexOf': function (item) {
var underlyingArray = this();
return ko.utils.arrayIndexOf(underlyingArray, item);
},
'replace': function(oldItem, newItem) {
var index = this['indexOf'](oldItem);
if (index >= 0) {
this.valueWillMutate();
this.peek()[index] = newItem;
this.valueHasMutated();
}
}
};
// Populate ko.observableArray.fn with read/write functions from native arrays
// Important: Do not add any additional functions here that may reasonably be used to *read* data from the array
// because we'll eval them without causing subscriptions, so ko.computed output could end up getting stale
ko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function (methodName) {
ko.observableArray['fn'][methodName] = function () {
// Use "peek" to avoid creating a subscription in any computed that we're executing in the context of
// (for consistency with mutating regular observables)
var underlyingArray = this.peek();
this.valueWillMutate();
this.cacheDiffForKnownOperation(underlyingArray, methodName, arguments);
var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);
this.valueHasMutated();
return methodCallResult;
};
});
// Populate ko.observableArray.fn with read-only functions from native arrays
ko.utils.arrayForEach(["slice"], function (methodName) {
ko.observableArray['fn'][methodName] = function () {
var underlyingArray = this();
return underlyingArray[methodName].apply(underlyingArray, arguments);
};
});
// Note that for browsers that don't support proto assignment, the
// inheritance chain is created manually in the ko.observableArray constructor
if (ko.utils.canSetPrototype) {
ko.utils.setPrototypeOf(ko.observableArray['fn'], ko.observable['fn']);
}
ko.exportSymbol('observableArray', ko.observableArray);
var arrayChangeEventName = 'arrayChange';
ko.extenders['trackArrayChanges'] = function(target) {
// Only modify the target observable once
if (target.cacheDiffForKnownOperation) {
return;
}
var trackingChanges = false,
cachedDiff = null,
arrayChangeSubscription,
pendingNotifications = 0,
underlyingBeforeSubscriptionAddFunction = target.beforeSubscriptionAdd,
underlyingAfterSubscriptionRemoveFunction = target.afterSubscriptionRemove;
// Watch "subscribe" calls, and for array change events, ensure change tracking is enabled
target.beforeSubscriptionAdd = function (event) {
if (underlyingBeforeSubscriptionAddFunction)
underlyingBeforeSubscriptionAddFunction.call(target, event);
if (event === arrayChangeEventName) {
trackChanges();
}
};
// Watch "dispose" calls, and for array change events, ensure change tracking is disabled when all are disposed
target.afterSubscriptionRemove = function (event) {
if (underlyingAfterSubscriptionRemoveFunction)
underlyingAfterSubscriptionRemoveFunction.call(target, event);
if (event === arrayChangeEventName && !target.hasSubscriptionsForEvent(arrayChangeEventName)) {
arrayChangeSubscription.dispose();
trackingChanges = false;
}
};
function trackChanges() {
// Calling 'trackChanges' multiple times is the same as calling it once
if (trackingChanges) {
return;
}
trackingChanges = true;
// Intercept "notifySubscribers" to track how many times it was called.
var underlyingNotifySubscribersFunction = target['notifySubscribers'];
target['notifySubscribers'] = function(valueToNotify, event) {
if (!event || event === defaultEvent) {
++pendingNotifications;
}
return underlyingNotifySubscribersFunction.apply(this, arguments);
};
// Each time the array changes value, capture a clone so that on the next
// change it's possible to produce a diff
var previousContents = [].concat(target.peek() || []);
cachedDiff = null;
arrayChangeSubscription = target.subscribe(function(currentContents) {
// Make a copy of the current contents and ensure it's an array
currentContents = [].concat(currentContents || []);
// Compute the diff and issue notifications, but only if someone is listening
if (target.hasSubscriptionsForEvent(arrayChangeEventName)) {
var changes = getChanges(previousContents, currentContents);
}
// Eliminate references to the old, removed items, so they can be GCed
previousContents = currentContents;
cachedDiff = null;
pendingNotifications = 0;
if (changes && changes.length) {
target['notifySubscribers'](changes, arrayChangeEventName);
}
});
}
function getChanges(previousContents, currentContents) {
// We try to re-use cached diffs.
// The scenarios where pendingNotifications > 1 are when using rate-limiting or the Deferred Updates
// plugin, which without this check would not be compatible with arrayChange notifications. Normally,
// notifications are issued immediately so we wouldn't be queueing up more than one.
if (!cachedDiff || pendingNotifications > 1) {
cachedDiff = ko.utils.compareArrays(previousContents, currentContents, { 'sparse': true });
}
return cachedDiff;
}
target.cacheDiffForKnownOperation = function(rawArray, operationName, args) {
// Only run if we're currently tracking changes for this observable array
// and there aren't any pending deferred notifications.
if (!trackingChanges || pendingNotifications) {
return;
}
var diff = [],
arrayLength = rawArray.length,
argsLength = args.length,
offset = 0;
function pushDiff(status, value, index) {
return diff[diff.length] = { 'status': status, 'value': value, 'index': index };
}
switch (operationName) {
case 'push':
offset = arrayLength;
case 'unshift':
for (var index = 0; index < argsLength; index++) {
pushDiff('added', args[index], offset + index);
}
break;
case 'pop':
offset = arrayLength - 1;
case 'shift':
if (arrayLength) {
pushDiff('deleted', rawArray[offset], offset);
}
break;
case 'splice':
// Negative start index means 'from end of array'. After that we clamp to [0...arrayLength].
// See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/splice
var startIndex = Math.min(Math.max(0, args[0] < 0 ? arrayLength + args[0] : args[0]), arrayLength),
endDeleteIndex = argsLength === 1 ? arrayLength : Math.min(startIndex + (args[1] || 0), arrayLength),
endAddIndex = startIndex + argsLength - 2,
endIndex = Math.max(endDeleteIndex, endAddIndex),
additions = [], deletions = [];
for (var index = startIndex, argsIndex = 2; index < endIndex; ++index, ++argsIndex) {
if (index < endDeleteIndex)
deletions.push(pushDiff('deleted', rawArray[index], index));
if (index < endAddIndex)
additions.push(pushDiff('added', args[argsIndex], index));
}
ko.utils.findMovesInArrayComparison(deletions, additions);
break;
default:
return;
}
cachedDiff = diff;
};
};
ko.computed = ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
var _latestValue,
_needsEvaluation = true,
_isBeingEvaluated = false,
_suppressDisposalUntilDisposeWhenReturnsFalse = false,
_isDisposed = false,
readFunction = evaluatorFunctionOrOptions,
pure = false,
isSleeping = false;
if (readFunction && typeof readFunction == "object") {
// Single-parameter syntax - everything is on this "options" param
options = readFunction;
readFunction = options["read"];
} else {
// Multi-parameter syntax - construct the options according to the params passed
options = options || {};
if (!readFunction)
readFunction = options["read"];
}
if (typeof readFunction != "function")
throw new Error("Pass a function that returns the value of the ko.computed");
function addDependencyTracking(id, target, trackingObj) {
if (pure && target === dependentObservable) {
throw Error("A 'pure' computed must not be called recursively");
}
dependencyTracking[id] = trackingObj;
trackingObj._order = _dependenciesCount++;
trackingObj._version = target.getVersion();
}
function haveDependenciesChanged() {
var id, dependency;
for (id in dependencyTracking) {
if (dependencyTracking.hasOwnProperty(id)) {
dependency = dependencyTracking[id];
if (dependency._target.hasChanged(dependency._version)) {
return true;
}
}
}
}
function disposeComputed() {
if (!isSleeping && dependencyTracking) {
ko.utils.objectForEach(dependencyTracking, function (id, dependency) {
if (dependency.dispose)
dependency.dispose();
});
}
dependencyTracking = null;
_dependenciesCount = 0;
_isDisposed = true;
_needsEvaluation = false;
isSleeping = false;
}
function evaluatePossiblyAsync() {
var throttleEvaluationTimeout = dependentObservable['throttleEvaluation'];
if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
clearTimeout(evaluationTimeoutInstance);
evaluationTimeoutInstance = setTimeout(function () {
evaluateImmediate(true /*notifyChange*/);
}, throttleEvaluationTimeout);
} else if (dependentObservable._evalRateLimited) {
dependentObservable._evalRateLimited();
} else {
evaluateImmediate(true /*notifyChange*/);
}
}
function evaluateImmediate(notifyChange) {
if (_isBeingEvaluated) {
// If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation.
// This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost
// certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing
// their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387
return;
}
// Do not evaluate (and possibly capture new dependencies) if disposed
if (_isDisposed) {
return;
}
if (disposeWhen && disposeWhen()) {
// See comment below about _suppressDisposalUntilDisposeWhenReturnsFalse
if (!_suppressDisposalUntilDisposeWhenReturnsFalse) {
dispose();
return;
}
} else {
// It just did return false, so we can stop suppressing now
_suppressDisposalUntilDisposeWhenReturnsFalse = false;
}
_isBeingEvaluated = true;
try {
// Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal).
// Then, during evaluation, we cross off any that are in fact still being used.
var disposalCandidates = dependencyTracking,
disposalCount = _dependenciesCount,
isInitial = pure ? undefined : !_dependenciesCount; // If we're evaluating when there are no previous dependencies, it must be the first time
ko.dependencyDetection.begin({
callback: function(subscribable, id) {
if (!_isDisposed) {
if (disposalCount && disposalCandidates[id]) {
// Don't want to dispose this subscription, as it's still being used
addDependencyTracking(id, subscribable, disposalCandidates[id]);
delete disposalCandidates[id];
--disposalCount;
} else if (!dependencyTracking[id]) {
// Brand new subscription - add it
addDependencyTracking(id, subscribable, isSleeping ? { _target: subscribable } : subscribable.subscribe(evaluatePossiblyAsync));
}
}
},
computed: dependentObservable,
isInitial: isInitial
});
dependencyTracking = {};
_dependenciesCount = 0;
try {
var newValue = evaluatorFunctionTarget ? readFunction.call(evaluatorFunctionTarget) : readFunction();
} finally {
ko.dependencyDetection.end();
// For each subscription no longer being used, remove it from the active subscriptions list and dispose it
if (disposalCount && !isSleeping) {
ko.utils.objectForEach(disposalCandidates, function(id, toDispose) {
if (toDispose.dispose)
toDispose.dispose();
});
}
_needsEvaluation = false;
}
if (dependentObservable.isDifferent(_latestValue, newValue)) {
if (!isSleeping) {
notify(_latestValue, "beforeChange");
}
_latestValue = newValue;
if (DEBUG) dependentObservable._latestValue = _latestValue;
if (isSleeping) {
dependentObservable.updateVersion();
} else if (notifyChange) {
notify(_latestValue);
}
}
if (isInitial) {
notify(_latestValue, "awake");
}
} finally {
_isBeingEvaluated = false;
}
if (!_dependenciesCount)
dispose();
}
function dependentObservable() {
if (arguments.length > 0) {
if (typeof writeFunction === "function") {
// Writing a value
writeFunction.apply(evaluatorFunctionTarget, arguments);
} else {
throw new Error("Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.");
}
return this; // Permits chained assignments
} else {
// Reading the value
ko.dependencyDetection.registerDependency(dependentObservable);
if (_needsEvaluation || (isSleeping && haveDependenciesChanged())) {
evaluateImmediate();
}
return _latestValue;
}
}
function peek() {
// Peek won't re-evaluate, except while the computed is sleeping or to get the initial value when "deferEvaluation" is set.
if ((_needsEvaluation && !_dependenciesCount) || (isSleeping && haveDependenciesChanged())) {
evaluateImmediate();
}
return _latestValue;
}
function isActive() {
return _needsEvaluation || _dependenciesCount > 0;
}
function notify(value, event) {
dependentObservable["notifySubscribers"](value, event);
}
// By here, "options" is always non-null
var writeFunction = options["write"],
disposeWhenNodeIsRemoved = options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null,
disposeWhenOption = options["disposeWhen"] || options.disposeWhen,
disposeWhen = disposeWhenOption,
dispose = disposeComputed,
dependencyTracking = {},
_dependenciesCount = 0,
evaluationTimeoutInstance = null;
if (!evaluatorFunctionTarget)
evaluatorFunctionTarget = options["owner"];
ko.subscribable.call(dependentObservable);
ko.utils.setPrototypeOfOrExtend(dependentObservable, ko.dependentObservable['fn']);
dependentObservable.peek = peek;
dependentObservable.getDependenciesCount = function () { return _dependenciesCount; };
dependentObservable.hasWriteFunction = typeof writeFunction === "function";
dependentObservable.dispose = function () { dispose(); };
dependentObservable.isActive = isActive;
// Replace the limit function with one that delays evaluation as well.
var originalLimit = dependentObservable.limit;
dependentObservable.limit = function(limitFunction) {
originalLimit.call(dependentObservable, limitFunction);
dependentObservable._evalRateLimited = function() {
dependentObservable._rateLimitedBeforeChange(_latestValue);
_needsEvaluation = true; // Mark as dirty
// Pass the observable to the rate-limit code, which will access it when
// it's time to do the notification.
dependentObservable._rateLimitedChange(dependentObservable);
}
};
if (options['pure']) {
pure = true;
isSleeping = true; // Starts off sleeping; will awake on the first subscription
dependentObservable.beforeSubscriptionAdd = function (event) {
// If asleep, wake up the computed by subscribing to any dependencies.
if (!_isDisposed && isSleeping && event == 'change') {
isSleeping = false;
if (_needsEvaluation || haveDependenciesChanged()) {
dependencyTracking = null;
_dependenciesCount = 0;
_needsEvaluation = true;
evaluateImmediate();
} else {
// First put the dependencies in order
var dependeciesOrder = [];
ko.utils.objectForEach(dependencyTracking, function (id, dependency) {
dependeciesOrder[dependency._order] = id;
});
// Next, subscribe to each one
ko.utils.arrayForEach(dependeciesOrder, function(id, order) {
var dependency = dependencyTracking[id],
subscription = dependency._target.subscribe(evaluatePossiblyAsync);
subscription._order = order;
subscription._version = dependency._version;
dependencyTracking[id] = subscription;
});
}
if (!_isDisposed) { // test since evaluating could trigger disposal
notify(_latestValue, "awake");
}
}
};
dependentObservable.afterSubscriptionRemove = function (event) {
if (!_isDisposed && event == 'change' && !dependentObservable.hasSubscriptionsForEvent('change')) {
ko.utils.objectForEach(dependencyTracking, function (id, dependency) {
if (dependency.dispose) {
dependencyTracking[id] = {
_target: dependency._target,
_order: dependency._order,
_version: dependency._version
};
dependency.dispose();
}
});
isSleeping = true;
notify(undefined, "asleep");
}
};
// Because a pure computed is not automatically updated while it is sleeping, we can't
// simply return the version number. Instead, we check if any of the dependencies have
// changed and conditionally re-evaluate the computed observable.
dependentObservable._originalGetVersion = dependentObservable.getVersion;
dependentObservable.getVersion = function () {
if (isSleeping && (_needsEvaluation || haveDependenciesChanged())) {
evaluateImmediate();
}
return dependentObservable._originalGetVersion();
};
} else if (options['deferEvaluation']) {
// This will force a computed with deferEvaluation to evaluate when the first subscriptions is registered.
dependentObservable.beforeSubscriptionAdd = function (event) {
if (event == 'change' || event == 'beforeChange') {
peek();
}
}
}
ko.exportProperty(dependentObservable, 'peek', dependentObservable.peek);
ko.exportProperty(dependentObservable, 'dispose', dependentObservable.dispose);
ko.exportProperty(dependentObservable, 'isActive', dependentObservable.isActive);
ko.exportProperty(dependentObservable, 'getDependenciesCount', dependentObservable.getDependenciesCount);
// Add a "disposeWhen" callback that, on each evaluation, disposes if the node was removed without using ko.removeNode.
if (disposeWhenNodeIsRemoved) {
// Since this computed is associated with a DOM node, and we don't want to dispose the computed
// until the DOM node is *removed* from the document (as opposed to never having been in the document),
// we'll prevent disposal until "disposeWhen" first returns false.
_suppressDisposalUntilDisposeWhenReturnsFalse = true;
// Only watch for the node's disposal if the value really is a node. It might not be,
// e.g., { disposeWhenNodeIsRemoved: true } can be used to opt into the "only dispose
// after first false result" behaviour even if there's no specific node to watch. This
// technique is intended for KO's internal use only and shouldn't be documented or used
// by application code, as it's likely to change in a future version of KO.
if (disposeWhenNodeIsRemoved.nodeType) {
disposeWhen = function () {
return !ko.utils.domNodeIsAttachedToDocument(disposeWhenNodeIsRemoved) || (disposeWhenOption && disposeWhenOption());
};
}
}
// Evaluate, unless sleeping or deferEvaluation is true
if (!isSleeping && !options['deferEvaluation'])
evaluateImmediate();
// Attach a DOM node disposal callback so that the computed will be proactively disposed as soon as the node is
// removed using ko.removeNode. But skip if isActive is false (there will never be any dependencies to dispose).
if (disposeWhenNodeIsRemoved && isActive() && disposeWhenNodeIsRemoved.nodeType) {
dispose = function() {
ko.utils.domNodeDisposal.removeDisposeCallback(disposeWhenNodeIsRemoved, dispose);
disposeComputed();
};
ko.utils.domNodeDisposal.addDisposeCallback(disposeWhenNodeIsRemoved, dispose);
}
return dependentObservable;
};
ko.isComputed = function(instance) {
return ko.hasPrototype(instance, ko.dependentObservable);
};
var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
ko.dependentObservable[protoProp] = ko.observable;
ko.dependentObservable['fn'] = {
"equalityComparer": valuesArePrimitiveAndEqual
};
ko.dependentObservable['fn'][protoProp] = ko.dependentObservable;
// Note that for browsers that don't support proto assignment, the
// inheritance chain is created manually in the ko.dependentObservable constructor
if (ko.utils.canSetPrototype) {
ko.utils.setPrototypeOf(ko.dependentObservable['fn'], ko.subscribable['fn']);
}
ko.exportSymbol('dependentObservable', ko.dependentObservable);
ko.exportSymbol('computed', ko.dependentObservable); // Make "ko.computed" an alias for "ko.dependentObservable"
ko.exportSymbol('isComputed', ko.isComputed);
ko.pureComputed = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget) {
if (typeof evaluatorFunctionOrOptions === 'function') {
return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget, {'pure':true});
} else {
evaluatorFunctionOrOptions = ko.utils.extend({}, evaluatorFunctionOrOptions); // make a copy of the parameter object
evaluatorFunctionOrOptions['pure'] = true;
return ko.computed(evaluatorFunctionOrOptions, evaluatorFunctionTarget);
}
}
ko.exportSymbol('pureComputed', ko.pureComputed);
(function() {
var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle)
ko.toJS = function(rootObject) {
if (arguments.length == 0)
throw new Error("When calling ko.toJS, pass the object you want to convert.");
// We just unwrap everything at every level in the object graph
return mapJsObjectGraph(rootObject, function(valueToMap) {
// Loop because an observable's value might in turn be another observable wrapper
for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)
valueToMap = valueToMap();
return valueToMap;
});
};
ko.toJSON = function(rootObject, replacer, space) { // replacer and space are optional
var plainJavaScriptObject = ko.toJS(rootObject);
return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);
};
function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {
visitedObjects = visitedObjects || new objectLookup();
rootObject = mapInputCallback(rootObject);
var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof Date)) && (!(rootObject instanceof String)) && (!(rootObject instanceof Number)) && (!(rootObject instanceof Boolean));
if (!canHaveProperties)
return rootObject;
var outputProperties = rootObject instanceof Array ? [] : {};
visitedObjects.save(rootObject, outputProperties);
visitPropertiesOrArrayEntries(rootObject, function(indexer) {
var propertyValue = mapInputCallback(rootObject[indexer]);
switch (typeof propertyValue) {
case "boolean":
case "number":
case "string":
case "function":
outputProperties[indexer] = propertyValue;
break;
case "object":
case "undefined":
var previouslyMappedValue = visitedObjects.get(propertyValue);
outputProperties[indexer] = (previouslyMappedValue !== undefined)
? previouslyMappedValue
: mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);
break;
}
});
return outputProperties;
}
function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {
if (rootObject instanceof Array) {
for (var i = 0; i < rootObject.length; i++)
visitorCallback(i);
// For arrays, also respect toJSON property for custom mappings (fixes #278)
if (typeof rootObject['toJSON'] == 'function')
visitorCallback('toJSON');
} else {
for (var propertyName in rootObject) {
visitorCallback(propertyName);
}
}
};
function objectLookup() {
this.keys = [];
this.values = [];
};
objectLookup.prototype = {
constructor: objectLookup,
save: function(key, value) {
var existingIndex = ko.utils.arrayIndexOf(this.keys, key);
if (existingIndex >= 0)
this.values[existingIndex] = value;
else {
this.keys.push(key);
this.values.push(value);
}
},
get: function(key) {
var existingIndex = ko.utils.arrayIndexOf(this.keys, key);
return (existingIndex >= 0) ? this.values[existingIndex] : undefined;
}
};
})();
ko.exportSymbol('toJS', ko.toJS);
ko.exportSymbol('toJSON', ko.toJSON);
(function () {
var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';
// Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
// are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
// that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
ko.selectExtensions = {
readValue : function(element) {
switch (ko.utils.tagNameLower(element)) {
case 'option':
if (element[hasDomDataExpandoProperty] === true)
return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);
return ko.utils.ieVersion <= 7
? (element.getAttributeNode('value') && element.getAttributeNode('value').specified ? element.value : element.text)
: element.value;
case 'select':
return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;
default:
return element.value;
}
},
writeValue: function(element, value, allowUnset) {
switch (ko.utils.tagNameLower(element)) {
case 'option':
switch(typeof value) {
case "string":
ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node
delete element[hasDomDataExpandoProperty];
}
element.value = value;
break;
default:
// Store arbitrary object using DomData
ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
element[hasDomDataExpandoProperty] = true;
// Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.
element.value = typeof value === "number" ? value : "";
break;
}
break;
case 'select':
if (value === "" || value === null) // A blank string or null value will select the caption
value = undefined;
var selection = -1;
for (var i = 0, n = element.options.length, optionValue; i < n; ++i) {
optionValue = ko.selectExtensions.readValue(element.options[i]);
// Include special check to handle selecting a caption with a blank string value
if (optionValue == value || (optionValue == "" && value === undefined)) {
selection = i;
break;
}
}
if (allowUnset || selection >= 0 || (value === undefined && element.size > 1)) {
element.selectedIndex = selection;
}
break;
default:
if ((value === null) || (value === undefined))
value = "";
element.value = value;
break;
}
}
};
})();
ko.exportSymbol('selectExtensions', ko.selectExtensions);
ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue);
ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue);
ko.expressionRewriting = (function () {
var javaScriptReservedWords = ["true", "false", "null", "undefined"];
// Matches something that can be assigned to--either an isolated identifier or something ending with a property accessor
// This is designed to be simple and avoid false negatives, but could produce false positives (e.g., a+b.c).
// This also will not properly handle nested brackets (e.g., obj1[obj2['prop']]; see #911).
var javaScriptAssignmentTarget = /^(?:[$_a-z][$\w]*|(.+)(\.\s*[$_a-z][$\w]*|\[.+\]))$/i;
function getWriteableValue(expression) {
if (ko.utils.arrayIndexOf(javaScriptReservedWords, expression) >= 0)
return false;
var match = expression.match(javaScriptAssignmentTarget);
return match === null ? false : match[1] ? ('Object(' + match[1] + ')' + match[2]) : expression;
}
// The following regular expressions will be used to split an object-literal string into tokens
// These two match strings, either with double quotes or single quotes
var stringDouble = '"(?:[^"\\\\]|\\\\.)*"',
stringSingle = "'(?:[^'\\\\]|\\\\.)*'",
// Matches a regular expression (text enclosed by slashes), but will also match sets of divisions
// as a regular expression (this is handled by the parsing loop below).
stringRegexp = '/(?:[^/\\\\]|\\\\.)*/\w*',
// These characters have special meaning to the parser and must not appear in the middle of a
// token, except as part of a string.
specials = ',"\'{}()/:[\\]',
// Match text (at least two characters) that does not contain any of the above special characters,
// although some of the special characters are allowed to start it (all but the colon and comma).
// The text can contain spaces, but leading or trailing spaces are skipped.
everyThingElse = '[^\\s:,/][^' + specials + ']*[^\\s' + specials + ']',
// Match any non-space character not matched already. This will match colons and commas, since they're
// not matched by "everyThingElse", but will also match any other single character that wasn't already
// matched (for example: in "a: 1, b: 2", each of the non-space characters will be matched by oneNotSpace).
oneNotSpace = '[^\\s]',
// Create the actual regular expression by or-ing the above strings. The order is important.
bindingToken = RegExp(stringDouble + '|' + stringSingle + '|' + stringRegexp + '|' + everyThingElse + '|' + oneNotSpace, 'g'),
// Match end of previous token to determine whether a slash is a division or regex.
divisionLookBehind = /[\])"'A-Za-z0-9_$]+$/,
keywordRegexLookBehind = {'in':1,'return':1,'typeof':1};
function parseObjectLiteral(objectLiteralString) {
// Trim leading and trailing spaces from the string
var str = ko.utils.stringTrim(objectLiteralString);
// Trim braces '{' surrounding the whole object literal
if (str.charCodeAt(0) === 123) str = str.slice(1, -1);
// Split into tokens
var result = [], toks = str.match(bindingToken), key, values = [], depth = 0;
if (toks) {
// Append a comma so that we don't need a separate code block to deal with the last item
toks.push(',');
for (var i = 0, tok; tok = toks[i]; ++i) {
var c = tok.charCodeAt(0);
// A comma signals the end of a key/value pair if depth is zero
if (c === 44) { // ","
if (depth <= 0) {
result.push((key && values.length) ? {key: key, value: values.join('')} : {'unknown': key || values.join('')});
key = depth = 0;
values = [];
continue;
}
// Simply skip the colon that separates the name and value
} else if (c === 58) { // ":"
if (!depth && !key && values.length === 1) {
key = values.pop();
continue;
}
// A set of slashes is initially matched as a regular expression, but could be division
} else if (c === 47 && i && tok.length > 1) { // "/"
// Look at the end of the previous token to determine if the slash is actually division
var match = toks[i-1].match(divisionLookBehind);
if (match && !keywordRegexLookBehind[match[0]]) {
// The slash is actually a division punctuator; re-parse the remainder of the string (not including the slash)
str = str.substr(str.indexOf(tok) + 1);
toks = str.match(bindingToken);
toks.push(',');
i = -1;
// Continue with just the slash
tok = '/';
}
// Increment depth for parentheses, braces, and brackets so that interior commas are ignored
} else if (c === 40 || c === 123 || c === 91) { // '(', '{', '['
++depth;
} else if (c === 41 || c === 125 || c === 93) { // ')', '}', ']'
--depth;
// The key will be the first token; if it's a string, trim the quotes
} else if (!key && !values.length && (c === 34 || c === 39)) { // '"', "'"
tok = tok.slice(1, -1);
}
values.push(tok);
}
}
return result;
}
// Two-way bindings include a write function that allow the handler to update the value even if it's not an observable.
var twoWayBindings = {};
function preProcessBindings(bindingsStringOrKeyValueArray, bindingOptions) {
bindingOptions = bindingOptions || {};
function processKeyValue(key, val) {
var writableVal;
function callPreprocessHook(obj) {
return (obj && obj['preprocess']) ? (val = obj['preprocess'](val, key, processKeyValue)) : true;
}
if (!bindingParams) {
if (!callPreprocessHook(ko['getBindingHandler'](key)))
return;
if (twoWayBindings[key] && (writableVal = getWriteableValue(val))) {
// For two-way bindings, provide a write method in case the value
// isn't a writable observable.
propertyAccessorResultStrings.push("'" + key + "':function(_z){" + writableVal + "=_z}");
}
}
// Values are wrapped in a function so that each value can be accessed independently
if (makeValueAccessors) {
val = 'function(){return ' + val + ' }';
}
resultStrings.push("'" + key + "':" + val);
}
var resultStrings = [],
propertyAccessorResultStrings = [],
makeValueAccessors = bindingOptions['valueAccessors'],
bindingParams = bindingOptions['bindingParams'],
keyValueArray = typeof bindingsStringOrKeyValueArray === "string" ?
parseObjectLiteral(bindingsStringOrKeyValueArray) : bindingsStringOrKeyValueArray;
ko.utils.arrayForEach(keyValueArray, function(keyValue) {
processKeyValue(keyValue.key || keyValue['unknown'], keyValue.value);
});
if (propertyAccessorResultStrings.length)
processKeyValue('_ko_property_writers', "{" + propertyAccessorResultStrings.join(",") + " }");
return resultStrings.join(",");
}
return {
bindingRewriteValidators: [],
twoWayBindings: twoWayBindings,
parseObjectLiteral: parseObjectLiteral,
preProcessBindings: preProcessBindings,
keyValueArrayContainsKey: function(keyValueArray, key) {
for (var i = 0; i < keyValueArray.length; i++)
if (keyValueArray[i]['key'] == key)
return true;
return false;
},
// Internal, private KO utility for updating model properties from within bindings
// property: If the property being updated is (or might be) an observable, pass it here
// If it turns out to be a writable observable, it will be written to directly
// allBindings: An object with a get method to retrieve bindings in the current execution context.
// This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable
// key: The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus'
// value: The value to be written
// checkIfDifferent: If true, and if the property being written is a writable observable, the value will only be written if
// it is !== existing value on that writable observable
writeValueToProperty: function(property, allBindings, key, value, checkIfDifferent) {
if (!property || !ko.isObservable(property)) {
var propWriters = allBindings.get('_ko_property_writers');
if (propWriters && propWriters[key])
propWriters[key](value);
} else if (ko.isWriteableObservable(property) && (!checkIfDifferent || property.peek() !== value)) {
property(value);
}
}
};
})();
ko.exportSymbol('expressionRewriting', ko.expressionRewriting);
ko.exportSymbol('expressionRewriting.bindingRewriteValidators', ko.expressionRewriting.bindingRewriteValidators);
ko.exportSymbol('expressionRewriting.parseObjectLiteral', ko.expressionRewriting.parseObjectLiteral);
ko.exportSymbol('expressionRewriting.preProcessBindings', ko.expressionRewriting.preProcessBindings);
// Making bindings explicitly declare themselves as "two way" isn't ideal in the long term (it would be better if
// all bindings could use an official 'property writer' API without needing to declare that they might). However,
// since this is not, and has never been, a public API (_ko_property_writers was never documented), it's acceptable
// as an internal implementation detail in the short term.
// For those developers who rely on _ko_property_writers in their custom bindings, we expose _twoWayBindings as an
// undocumented feature that makes it relatively easy to upgrade to KO 3.0. However, this is still not an official
// public API, and we reserve the right to remove it at any time if we create a real public property writers API.
ko.exportSymbol('expressionRewriting._twoWayBindings', ko.expressionRewriting.twoWayBindings);
// For backward compatibility, define the following aliases. (Previously, these function names were misleading because
// they referred to JSON specifically, even though they actually work with arbitrary JavaScript object literal expressions.)
ko.exportSymbol('jsonExpressionRewriting', ko.expressionRewriting);
ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.expressionRewriting.preProcessBindings);
(function() {
// "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes
// may be used to represent hierarchy (in addition to the DOM's natural hierarchy).
// If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state
// of that virtual hierarchy
//
// The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)
// without having to scatter special cases all over the binding and templating code.
// IE 9 cannot reliably read the "nodeValue" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186)
// but it does give them a nonstandard alternative property called "text" that it can read reliably. Other browsers don't have that property.
// So, use node.text where available, and node.nodeValue elsewhere
var commentNodesHaveTextProperty = document && document.createComment("test").text === "<!--test-->";
var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*ko(?:\s+([\s\S]+))?\s*-->$/ : /^\s*ko(?:\s+([\s\S]+))?\s*$/;
var endCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/;
var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };
function isStartComment(node) {
return (node.nodeType == 8) && startCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);
}
function isEndComment(node) {
return (node.nodeType == 8) && endCommentRegex.test(commentNodesHaveTextProperty ? node.text : node.nodeValue);
}
function getVirtualChildren(startComment, allowUnbalanced) {
var currentNode = startComment;
var depth = 1;
var children = [];
while (currentNode = currentNode.nextSibling) {
if (isEndComment(currentNode)) {
depth--;
if (depth === 0)
return children;
}
children.push(currentNode);
if (isStartComment(currentNode))
depth++;
}
if (!allowUnbalanced)
throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue);
return null;
}
function getMatchingEndComment(startComment, allowUnbalanced) {
var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced);
if (allVirtualChildren) {
if (allVirtualChildren.length > 0)
return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;
return startComment.nextSibling;
} else
return null; // Must have no matching end comment, and allowUnbalanced is true
}
function getUnbalancedChildTags(node) {
// e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span>
// from <div>OK</div><!-- /ko --><!-- /ko -->, returns: <!-- /ko --><!-- /ko -->
var childNode = node.firstChild, captureRemaining = null;
if (childNode) {
do {
if (captureRemaining) // We already hit an unbalanced node and are now just scooping up all subsequent nodes
captureRemaining.push(childNode);
else if (isStartComment(childNode)) {
var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true);
if (matchingEndComment) // It's a balanced tag, so skip immediately to the end of this virtual set
childNode = matchingEndComment;
else
captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point
} else if (isEndComment(childNode)) {
captureRemaining = [childNode]; // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing
}
} while (childNode = childNode.nextSibling);
}
return captureRemaining;
}
ko.virtualElements = {
allowedBindings: {},
childNodes: function(node) {
return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;
},
emptyNode: function(node) {
if (!isStartComment(node))
ko.utils.emptyDomNode(node);
else {
var virtualChildren = ko.virtualElements.childNodes(node);
for (var i = 0, j = virtualChildren.length; i < j; i++)
ko.removeNode(virtualChildren[i]);
}
},
setDomNodeChildren: function(node, childNodes) {
if (!isStartComment(node))
ko.utils.setDomNodeChildren(node, childNodes);
else {
ko.virtualElements.emptyNode(node);
var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children
for (var i = 0, j = childNodes.length; i < j; i++)
endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);
}
},
prepend: function(containerNode, nodeToPrepend) {
if (!isStartComment(containerNode)) {
if (containerNode.firstChild)
containerNode.insertBefore(nodeToPrepend, containerNode.firstChild);
else
containerNode.appendChild(nodeToPrepend);
} else {
// Start comments must always have a parent and at least one following sibling (the end comment)
containerNode.parentNode.insertBefore(nodeToPrepend, containerNode.nextSibling);
}
},
insertAfter: function(containerNode, nodeToInsert, insertAfterNode) {
if (!insertAfterNode) {
ko.virtualElements.prepend(containerNode, nodeToInsert);
} else if (!isStartComment(containerNode)) {
// Insert after insertion point
if (insertAfterNode.nextSibling)
containerNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
else
containerNode.appendChild(nodeToInsert);
} else {
// Children of start comments must always have a parent and at least one following sibling (the end comment)
containerNode.parentNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
}
},
firstChild: function(node) {
if (!isStartComment(node))
return node.firstChild;
if (!node.nextSibling || isEndComment(node.nextSibling))
return null;
return node.nextSibling;
},
nextSibling: function(node) {
if (isStartComment(node))
node = getMatchingEndComment(node);
if (node.nextSibling && isEndComment(node.nextSibling))
return null;
return node.nextSibling;
},
hasBindingValue: isStartComment,
virtualNodeBindingValue: function(node) {
var regexMatch = (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);
return regexMatch ? regexMatch[1] : null;
},
normaliseVirtualElementDomStructure: function(elementVerified) {
// Workaround for https://github.com/SteveSanderson/knockout/issues/155
// (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes
// that are direct descendants of <ul> into the preceding <li>)
if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)])
return;
// Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags
// must be intended to appear *after* that child, so move them there.
var childNode = elementVerified.firstChild;
if (childNode) {
do {
if (childNode.nodeType === 1) {
var unbalancedTags = getUnbalancedChildTags(childNode);
if (unbalancedTags) {
// Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child
var nodeToInsertBefore = childNode.nextSibling;
for (var i = 0; i < unbalancedTags.length; i++) {
if (nodeToInsertBefore)
elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore);
else
elementVerified.appendChild(unbalancedTags[i]);
}
}
}
} while (childNode = childNode.nextSibling);
}
}
};
})();
ko.exportSymbol('virtualElements', ko.virtualElements);
ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings);
ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode);
//ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild); // firstChild is not minified
ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);
//ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling); // nextSibling is not minified
ko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend);
ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren);
(function() {
var defaultBindingAttributeName = "data-bind";
ko.bindingProvider = function() {
this.bindingCache = {};
};
ko.utils.extend(ko.bindingProvider.prototype, {
'nodeHasBindings': function(node) {
switch (node.nodeType) {
case 1: // Element
return node.getAttribute(defaultBindingAttributeName) != null
|| ko.components['getComponentNameForNode'](node);
case 8: // Comment node
return ko.virtualElements.hasBindingValue(node);
default: return false;
}
},
'getBindings': function(node, bindingContext) {
var bindingsString = this['getBindingsString'](node, bindingContext),
parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node) : null;
return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ false);
},
'getBindingAccessors': function(node, bindingContext) {
var bindingsString = this['getBindingsString'](node, bindingContext),
parsedBindings = bindingsString ? this['parseBindingsString'](bindingsString, bindingContext, node, { 'valueAccessors': true }) : null;
return ko.components.addBindingsForCustomElement(parsedBindings, node, bindingContext, /* valueAccessors */ true);
},
// The following function is only used internally by this default provider.
// It's not part of the interface definition for a general binding provider.
'getBindingsString': function(node, bindingContext) {
switch (node.nodeType) {
case 1: return node.getAttribute(defaultBindingAttributeName); // Element
case 8: return ko.virtualElements.virtualNodeBindingValue(node); // Comment node
default: return null;
}
},
// The following function is only used internally by this default provider.
// It's not part of the interface definition for a general binding provider.
'parseBindingsString': function(bindingsString, bindingContext, node, options) {
try {
var bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, this.bindingCache, options);
return bindingFunction(bindingContext, node);
} catch (ex) {
ex.message = "Unable to parse bindings.\nBindings value: " + bindingsString + "\nMessage: " + ex.message;
throw ex;
}
}
});
ko.bindingProvider['instance'] = new ko.bindingProvider();
function createBindingsStringEvaluatorViaCache(bindingsString, cache, options) {
var cacheKey = bindingsString + (options && options['valueAccessors'] || '');
return cache[cacheKey]
|| (cache[cacheKey] = createBindingsStringEvaluator(bindingsString, options));
}
function createBindingsStringEvaluator(bindingsString, options) {
// Build the source for a function that evaluates "expression"
// For each scope variable, add an extra level of "with" nesting
// Example result: with(sc1) { with(sc0) { return (expression) } }
var rewrittenBindings = ko.expressionRewriting.preProcessBindings(bindingsString, options),
functionBody = "with($context){with($data||{}){return{" + rewrittenBindings + "}}}";
return new Function("$context", "$element", functionBody);
}
})();
ko.exportSymbol('bindingProvider', ko.bindingProvider);
(function () {
ko.bindingHandlers = {};
// The following element types will not be recursed into during binding. In the future, we
// may consider adding <template> to this list, because such elements' contents are always
// intended to be bound in a different context from where they appear in the document.
var bindingDoesNotRecurseIntoElementTypes = {
// Don't want bindings that operate on text nodes to mutate <script> and <textarea> contents,
// because it's unexpected and a potential XSS issue
'script': true,
'textarea': true
};
// Use an overridable method for retrieving binding handlers so that a plugins may support dynamically created handlers
ko['getBindingHandler'] = function(bindingKey) {
return ko.bindingHandlers[bindingKey];
};
// The ko.bindingContext constructor is only called directly to create the root context. For child
// contexts, use bindingContext.createChildContext or bindingContext.extend.
ko.bindingContext = function(dataItemOrAccessor, parentContext, dataItemAlias, extendCallback) {
// The binding context object includes static properties for the current, parent, and root view models.
// If a view model is actually stored in an observable, the corresponding binding context object, and
// any child contexts, must be updated when the view model is changed.
function updateContext() {
// Most of the time, the context will directly get a view model object, but if a function is given,
// we call the function to retrieve the view model. If the function accesses any obsevables or returns
// an observable, the dependency is tracked, and those observables can later cause the binding
// context to be updated.
var dataItemOrObservable = isFunc ? dataItemOrAccessor() : dataItemOrAccessor,
dataItem = ko.utils.unwrapObservable(dataItemOrObservable);
if (parentContext) {
// When a "parent" context is given, register a dependency on the parent context. Thus whenever the
// parent context is updated, this context will also be updated.
if (parentContext._subscribable)
parentContext._subscribable();
// Copy $root and any custom properties from the parent context
ko.utils.extend(self, parentContext);
// Because the above copy overwrites our own properties, we need to reset them.
// During the first execution, "subscribable" isn't set, so don't bother doing the update then.
if (subscribable) {
self._subscribable = subscribable;
}
} else {
self['$parents'] = [];
self['$root'] = dataItem;
// Export 'ko' in the binding context so it will be available in bindings and templates
// even if 'ko' isn't exported as a global, such as when using an AMD loader.
// See https://github.com/SteveSanderson/knockout/issues/490
self['ko'] = ko;
}
self['$rawData'] = dataItemOrObservable;
self['$data'] = dataItem;
if (dataItemAlias)
self[dataItemAlias] = dataItem;
// The extendCallback function is provided when creating a child context or extending a context.
// It handles the specific actions needed to finish setting up the binding context. Actions in this
// function could also add dependencies to this binding context.
if (extendCallback)
extendCallback(self, parentContext, dataItem);
return self['$data'];
}
function disposeWhen() {
return nodes && !ko.utils.anyDomNodeIsAttachedToDocument(nodes);
}
var self = this,
isFunc = typeof(dataItemOrAccessor) == "function" && !ko.isObservable(dataItemOrAccessor),
nodes,
subscribable = ko.dependentObservable(updateContext, null, { disposeWhen: disposeWhen, disposeWhenNodeIsRemoved: true });
// At this point, the binding context has been initialized, and the "subscribable" computed observable is
// subscribed to any observables that were accessed in the process. If there is nothing to track, the
// computed will be inactive, and we can safely throw it away. If it's active, the computed is stored in
// the context object.
if (subscribable.isActive()) {
self._subscribable = subscribable;
// Always notify because even if the model ($data) hasn't changed, other context properties might have changed
subscribable['equalityComparer'] = null;
// We need to be able to dispose of this computed observable when it's no longer needed. This would be
// easy if we had a single node to watch, but binding contexts can be used by many different nodes, and
// we cannot assume that those nodes have any relation to each other. So instead we track any node that
// the context is attached to, and dispose the computed when all of those nodes have been cleaned.
// Add properties to *subscribable* instead of *self* because any properties added to *self* may be overwritten on updates
nodes = [];
subscribable._addNode = function(node) {
nodes.push(node);
ko.utils.domNodeDisposal.addDisposeCallback(node, function(node) {
ko.utils.arrayRemoveItem(nodes, node);
if (!nodes.length) {
subscribable.dispose();
self._subscribable = subscribable = undefined;
}
});
};
}
}
// Extend the binding context hierarchy with a new view model object. If the parent context is watching
// any obsevables, the new child context will automatically get a dependency on the parent context.
// But this does not mean that the $data value of the child context will also get updated. If the child
// view model also depends on the parent view model, you must provide a function that returns the correct
// view model on each update.
ko.bindingContext.prototype['createChildContext'] = function (dataItemOrAccessor, dataItemAlias, extendCallback) {
return new ko.bindingContext(dataItemOrAccessor, this, dataItemAlias, function(self, parentContext) {
// Extend the context hierarchy by setting the appropriate pointers
self['$parentContext'] = parentContext;
self['$parent'] = parentContext['$data'];
self['$parents'] = (parentContext['$parents'] || []).slice(0);
self['$parents'].unshift(self['$parent']);
if (extendCallback)
extendCallback(self);
});
};
// Extend the binding context with new custom properties. This doesn't change the context hierarchy.
// Similarly to "child" contexts, provide a function here to make sure that the correct values are set
// when an observable view model is updated.
ko.bindingContext.prototype['extend'] = function(properties) {
// If the parent context references an observable view model, "_subscribable" will always be the
// latest view model object. If not, "_subscribable" isn't set, and we can use the static "$data" value.
return new ko.bindingContext(this._subscribable || this['$data'], this, null, function(self, parentContext) {
// This "child" context doesn't directly track a parent observable view model,
// so we need to manually set the $rawData value to match the parent.
self['$rawData'] = parentContext['$rawData'];
ko.utils.extend(self, typeof(properties) == "function" ? properties() : properties);
});
};
// Returns the valueAccesor function for a binding value
function makeValueAccessor(value) {
return function() {
return value;
};
}
// Returns the value of a valueAccessor function
function evaluateValueAccessor(valueAccessor) {
return valueAccessor();
}
// Given a function that returns bindings, create and return a new object that contains
// binding value-accessors functions. Each accessor function calls the original function
// so that it always gets the latest value and all dependencies are captured. This is used
// by ko.applyBindingsToNode and getBindingsAndMakeAccessors.
function makeAccessorsFromFunction(callback) {
return ko.utils.objectMap(ko.dependencyDetection.ignore(callback), function(value, key) {
return function() {
return callback()[key];
};
});
}
// Given a bindings function or object, create and return a new object that contains
// binding value-accessors functions. This is used by ko.applyBindingsToNode.
function makeBindingAccessors(bindings, context, node) {
if (typeof bindings === 'function') {
return makeAccessorsFromFunction(bindings.bind(null, context, node));
} else {
return ko.utils.objectMap(bindings, makeValueAccessor);
}
}
// This function is used if the binding provider doesn't include a getBindingAccessors function.
// It must be called with 'this' set to the provider instance.
function getBindingsAndMakeAccessors(node, context) {
return makeAccessorsFromFunction(this['getBindings'].bind(this, node, context));
}
function validateThatBindingIsAllowedForVirtualElements(bindingName) {
var validator = ko.virtualElements.allowedBindings[bindingName];
if (!validator)
throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements")
}
function applyBindingsToDescendantsInternal (bindingContext, elementOrVirtualElement, bindingContextsMayDifferFromDomParentElement) {
var currentChild,
nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement),
provider = ko.bindingProvider['instance'],
preprocessNode = provider['preprocessNode'];
// Preprocessing allows a binding provider to mutate a node before bindings are applied to it. For example it's
// possible to insert new siblings after it, and/or replace the node with a different one. This can be used to
// implement custom binding syntaxes, such as {{ value }} for string interpolation, or custom element types that
// trigger insertion of <template> contents at that point in the document.
if (preprocessNode) {
while (currentChild = nextInQueue) {
nextInQueue = ko.virtualElements.nextSibling(currentChild);
preprocessNode.call(provider, currentChild);
}
// Reset nextInQueue for the next loop
nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);
}
while (currentChild = nextInQueue) {
// Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position
nextInQueue = ko.virtualElements.nextSibling(currentChild);
applyBindingsToNodeAndDescendantsInternal(bindingContext, currentChild, bindingContextsMayDifferFromDomParentElement);
}
}
function applyBindingsToNodeAndDescendantsInternal (bindingContext, nodeVerified, bindingContextMayDifferFromDomParentElement) {
var shouldBindDescendants = true;
// Perf optimisation: Apply bindings only if...
// (1) We need to store the binding context on this node (because it may differ from the DOM parent node's binding context)
// Note that we can't store binding contexts on non-elements (e.g., text nodes), as IE doesn't allow expando properties for those
// (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)
var isElement = (nodeVerified.nodeType === 1);
if (isElement) // Workaround IE <= 8 HTML parsing weirdness
ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified);
var shouldApplyBindings = (isElement && bindingContextMayDifferFromDomParentElement) // Case (1)
|| ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified); // Case (2)
if (shouldApplyBindings)
shouldBindDescendants = applyBindingsToNodeInternal(nodeVerified, null, bindingContext, bindingContextMayDifferFromDomParentElement)['shouldBindDescendants'];
if (shouldBindDescendants && !bindingDoesNotRecurseIntoElementTypes[ko.utils.tagNameLower(nodeVerified)]) {
// We're recursing automatically into (real or virtual) child nodes without changing binding contexts. So,
// * For children of a *real* element, the binding context is certainly the same as on their DOM .parentNode,
// hence bindingContextsMayDifferFromDomParentElement is false
// * For children of a *virtual* element, we can't be sure. Evaluating .parentNode on those children may
// skip over any number of intermediate virtual elements, any of which might define a custom binding context,
// hence bindingContextsMayDifferFromDomParentElement is true
applyBindingsToDescendantsInternal(bindingContext, nodeVerified, /* bindingContextsMayDifferFromDomParentElement: */ !isElement);
}
}
var boundElementDomDataKey = ko.utils.domData.nextKey();
function topologicalSortBindings(bindings) {
// Depth-first sort
var result = [], // The list of key/handler pairs that we will return
bindingsConsidered = {}, // A temporary record of which bindings are already in 'result'
cyclicDependencyStack = []; // Keeps track of a depth-search so that, if there's a cycle, we know which bindings caused it
ko.utils.objectForEach(bindings, function pushBinding(bindingKey) {
if (!bindingsConsidered[bindingKey]) {
var binding = ko['getBindingHandler'](bindingKey);
if (binding) {
// First add dependencies (if any) of the current binding
if (binding['after']) {
cyclicDependencyStack.push(bindingKey);
ko.utils.arrayForEach(binding['after'], function(bindingDependencyKey) {
if (bindings[bindingDependencyKey]) {
if (ko.utils.arrayIndexOf(cyclicDependencyStack, bindingDependencyKey) !== -1) {
throw Error("Cannot combine the following bindings, because they have a cyclic dependency: " + cyclicDependencyStack.join(", "));
} else {
pushBinding(bindingDependencyKey);
}
}
});
cyclicDependencyStack.length--;
}
// Next add the current binding
result.push({ key: bindingKey, handler: binding });
}
bindingsConsidered[bindingKey] = true;
}
});
return result;
}
function applyBindingsToNodeInternal(node, sourceBindings, bindingContext, bindingContextMayDifferFromDomParentElement) {
// Prevent multiple applyBindings calls for the same node, except when a binding value is specified
var alreadyBound = ko.utils.domData.get(node, boundElementDomDataKey);
if (!sourceBindings) {
if (alreadyBound) {
throw Error("You cannot apply bindings multiple times to the same element.");
}
ko.utils.domData.set(node, boundElementDomDataKey, true);
}
// Optimization: Don't store the binding context on this node if it's definitely the same as on node.parentNode, because
// we can easily recover it just by scanning up the node's ancestors in the DOM
// (note: here, parent node means "real DOM parent" not "virtual parent", as there's no O(1) way to find the virtual parent)
if (!alreadyBound && bindingContextMayDifferFromDomParentElement)
ko.storedBindingContextForNode(node, bindingContext);
// Use bindings if given, otherwise fall back on asking the bindings provider to give us some bindings
var bindings;
if (sourceBindings && typeof sourceBindings !== 'function') {
bindings = sourceBindings;
} else {
var provider = ko.bindingProvider['instance'],
getBindings = provider['getBindingAccessors'] || getBindingsAndMakeAccessors;
// Get the binding from the provider within a computed observable so that we can update the bindings whenever
// the binding context is updated or if the binding provider accesses observables.
var bindingsUpdater = ko.dependentObservable(
function() {
bindings = sourceBindings ? sourceBindings(bindingContext, node) : getBindings.call(provider, node, bindingContext);
// Register a dependency on the binding context to support obsevable view models.
if (bindings && bindingContext._subscribable)
bindingContext._subscribable();
return bindings;
},
null, { disposeWhenNodeIsRemoved: node }
);
if (!bindings || !bindingsUpdater.isActive())
bindingsUpdater = null;
}
var bindingHandlerThatControlsDescendantBindings;
if (bindings) {
// Return the value accessor for a given binding. When bindings are static (won't be updated because of a binding
// context update), just return the value accessor from the binding. Otherwise, return a function that always gets
// the latest binding value and registers a dependency on the binding updater.
var getValueAccessor = bindingsUpdater
? function(bindingKey) {
return function() {
return evaluateValueAccessor(bindingsUpdater()[bindingKey]);
};
} : function(bindingKey) {
return bindings[bindingKey];
};
// Use of allBindings as a function is maintained for backwards compatibility, but its use is deprecated
function allBindings() {
return ko.utils.objectMap(bindingsUpdater ? bindingsUpdater() : bindings, evaluateValueAccessor);
}
// The following is the 3.x allBindings API
allBindings['get'] = function(key) {
return bindings[key] && evaluateValueAccessor(getValueAccessor(key));
};
allBindings['has'] = function(key) {
return key in bindings;
};
// First put the bindings into the right order
var orderedBindings = topologicalSortBindings(bindings);
// Go through the sorted bindings, calling init and update for each
ko.utils.arrayForEach(orderedBindings, function(bindingKeyAndHandler) {
// Note that topologicalSortBindings has already filtered out any nonexistent binding handlers,
// so bindingKeyAndHandler.handler will always be nonnull.
var handlerInitFn = bindingKeyAndHandler.handler["init"],
handlerUpdateFn = bindingKeyAndHandler.handler["update"],
bindingKey = bindingKeyAndHandler.key;
if (node.nodeType === 8) {
validateThatBindingIsAllowedForVirtualElements(bindingKey);
}
try {
// Run init, ignoring any dependencies
if (typeof handlerInitFn == "function") {
ko.dependencyDetection.ignore(function() {
var initResult = handlerInitFn(node, getValueAccessor(bindingKey), allBindings, bindingContext['$data'], bindingContext);
// If this binding handler claims to control descendant bindings, make a note of this
if (initResult && initResult['controlsDescendantBindings']) {
if (bindingHandlerThatControlsDescendantBindings !== undefined)
throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.");
bindingHandlerThatControlsDescendantBindings = bindingKey;
}
});
}
// Run update in its own computed wrapper
if (typeof handlerUpdateFn == "function") {
ko.dependentObservable(
function() {
handlerUpdateFn(node, getValueAccessor(bindingKey), allBindings, bindingContext['$data'], bindingContext);
},
null,
{ disposeWhenNodeIsRemoved: node }
);
}
} catch (ex) {
ex.message = "Unable to process binding \"" + bindingKey + ": " + bindings[bindingKey] + "\"\nMessage: " + ex.message;
throw ex;
}
});
}
return {
'shouldBindDescendants': bindingHandlerThatControlsDescendantBindings === undefined
};
};
var storedBindingContextDomDataKey = ko.utils.domData.nextKey();
ko.storedBindingContextForNode = function (node, bindingContext) {
if (arguments.length == 2) {
ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext);
if (bindingContext._subscribable)
bindingContext._subscribable._addNode(node);
} else {
return ko.utils.domData.get(node, storedBindingContextDomDataKey);
}
}
function getBindingContext(viewModelOrBindingContext) {
return viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
? viewModelOrBindingContext
: new ko.bindingContext(viewModelOrBindingContext);
}
ko.applyBindingAccessorsToNode = function (node, bindings, viewModelOrBindingContext) {
if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness
ko.virtualElements.normaliseVirtualElementDomStructure(node);
return applyBindingsToNodeInternal(node, bindings, getBindingContext(viewModelOrBindingContext), true);
};
ko.applyBindingsToNode = function (node, bindings, viewModelOrBindingContext) {
var context = getBindingContext(viewModelOrBindingContext);
return ko.applyBindingAccessorsToNode(node, makeBindingAccessors(bindings, context, node), context);
};
ko.applyBindingsToDescendants = function(viewModelOrBindingContext, rootNode) {
if (rootNode.nodeType === 1 || rootNode.nodeType === 8)
applyBindingsToDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode, true);
};
ko.applyBindings = function (viewModelOrBindingContext, rootNode) {
// If jQuery is loaded after Knockout, we won't initially have access to it. So save it here.
if (!jQueryInstance && window['jQuery']) {
jQueryInstance = window['jQuery'];
}
if (rootNode && (rootNode.nodeType !== 1) && (rootNode.nodeType !== 8))
throw new Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node");
rootNode = rootNode || window.document.body; // Make "rootNode" parameter optional
applyBindingsToNodeAndDescendantsInternal(getBindingContext(viewModelOrBindingContext), rootNode, true);
};
// Retrieving binding context from arbitrary nodes
ko.contextFor = function(node) {
// We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)
switch (node.nodeType) {
case 1:
case 8:
var context = ko.storedBindingContextForNode(node);
if (context) return context;
if (node.parentNode) return ko.contextFor(node.parentNode);
break;
}
return undefined;
};
ko.dataFor = function(node) {
var context = ko.contextFor(node);
return context ? context['$data'] : undefined;
};
ko.exportSymbol('bindingHandlers', ko.bindingHandlers);
ko.exportSymbol('applyBindings', ko.applyBindings);
ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants);
ko.exportSymbol('applyBindingAccessorsToNode', ko.applyBindingAccessorsToNode);
ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode);
ko.exportSymbol('contextFor', ko.contextFor);
ko.exportSymbol('dataFor', ko.dataFor);
})();
(function(undefined) {
var loadingSubscribablesCache = {}, // Tracks component loads that are currently in flight
loadedDefinitionsCache = {}; // Tracks component loads that have already completed
ko.components = {
get: function(componentName, callback) {
var cachedDefinition = getObjectOwnProperty(loadedDefinitionsCache, componentName);
if (cachedDefinition) {
// It's already loaded and cached. Reuse the same definition object.
// Note that for API consistency, even cache hits complete asynchronously by default.
// You can bypass this by putting synchronous:true on your component config.
if (cachedDefinition.isSynchronousComponent) {
ko.dependencyDetection.ignore(function() { // See comment in loaderRegistryBehaviors.js for reasoning
callback(cachedDefinition.definition);
});
} else {
setTimeout(function() { callback(cachedDefinition.definition); }, 0);
}
} else {
// Join the loading process that is already underway, or start a new one.
loadComponentAndNotify(componentName, callback);
}
},
clearCachedDefinition: function(componentName) {
delete loadedDefinitionsCache[componentName];
},
_getFirstResultFromLoaders: getFirstResultFromLoaders
};
function getObjectOwnProperty(obj, propName) {
return obj.hasOwnProperty(propName) ? obj[propName] : undefined;
}
function loadComponentAndNotify(componentName, callback) {
var subscribable = getObjectOwnProperty(loadingSubscribablesCache, componentName),
completedAsync;
if (!subscribable) {
// It's not started loading yet. Start loading, and when it's done, move it to loadedDefinitionsCache.
subscribable = loadingSubscribablesCache[componentName] = new ko.subscribable();
subscribable.subscribe(callback);
beginLoadingComponent(componentName, function(definition, config) {
var isSynchronousComponent = !!(config && config['synchronous']);
loadedDefinitionsCache[componentName] = { definition: definition, isSynchronousComponent: isSynchronousComponent };
delete loadingSubscribablesCache[componentName];
// For API consistency, all loads complete asynchronously. However we want to avoid
// adding an extra setTimeout if it's unnecessary (i.e., the completion is already
// async) since setTimeout(..., 0) still takes about 16ms or more on most browsers.
//
// You can bypass the 'always synchronous' feature by putting the synchronous:true
// flag on your component configuration when you register it.
if (completedAsync || isSynchronousComponent) {
// Note that notifySubscribers ignores any dependencies read within the callback.
// See comment in loaderRegistryBehaviors.js for reasoning
subscribable['notifySubscribers'](definition);
} else {
setTimeout(function() {
subscribable['notifySubscribers'](definition);
}, 0);
}
});
completedAsync = true;
} else {
subscribable.subscribe(callback);
}
}
function beginLoadingComponent(componentName, callback) {
getFirstResultFromLoaders('getConfig', [componentName], function(config) {
if (config) {
// We have a config, so now load its definition
getFirstResultFromLoaders('loadComponent', [componentName, config], function(definition) {
callback(definition, config);
});
} else {
// The component has no config - it's unknown to all the loaders.
// Note that this is not an error (e.g., a module loading error) - that would abort the
// process and this callback would not run. For this callback to run, all loaders must
// have confirmed they don't know about this component.
callback(null, null);
}
});
}
function getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders) {
// On the first call in the stack, start with the full set of loaders
if (!candidateLoaders) {
candidateLoaders = ko.components['loaders'].slice(0); // Use a copy, because we'll be mutating this array
}
// Try the next candidate
var currentCandidateLoader = candidateLoaders.shift();
if (currentCandidateLoader) {
var methodInstance = currentCandidateLoader[methodName];
if (methodInstance) {
var wasAborted = false,
synchronousReturnValue = methodInstance.apply(currentCandidateLoader, argsExceptCallback.concat(function(result) {
if (wasAborted) {
callback(null);
} else if (result !== null) {
// This candidate returned a value. Use it.
callback(result);
} else {
// Try the next candidate
getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);
}
}));
// Currently, loaders may not return anything synchronously. This leaves open the possibility
// that we'll extend the API to support synchronous return values in the future. It won't be
// a breaking change, because currently no loader is allowed to return anything except undefined.
if (synchronousReturnValue !== undefined) {
wasAborted = true;
// Method to suppress exceptions will remain undocumented. This is only to keep
// KO's specs running tidily, since we can observe the loading got aborted without
// having exceptions cluttering up the console too.
if (!currentCandidateLoader['suppressLoaderExceptions']) {
throw new Error('Component loaders must supply values by invoking the callback, not by returning values synchronously.');
}
}
} else {
// This candidate doesn't have the relevant handler. Synchronously move on to the next one.
getFirstResultFromLoaders(methodName, argsExceptCallback, callback, candidateLoaders);
}
} else {
// No candidates returned a value
callback(null);
}
}
// Reference the loaders via string name so it's possible for developers
// to replace the whole array by assigning to ko.components.loaders
ko.components['loaders'] = [];
ko.exportSymbol('components', ko.components);
ko.exportSymbol('components.get', ko.components.get);
ko.exportSymbol('components.clearCachedDefinition', ko.components.clearCachedDefinition);
})();
(function(undefined) {
// The default loader is responsible for two things:
// 1. Maintaining the default in-memory registry of component configuration objects
// (i.e., the thing you're writing to when you call ko.components.register(someName, ...))
// 2. Answering requests for components by fetching configuration objects
// from that default in-memory registry and resolving them into standard
// component definition objects (of the form { createViewModel: ..., template: ... })
// Custom loaders may override either of these facilities, i.e.,
// 1. To supply configuration objects from some other source (e.g., conventions)
// 2. Or, to resolve configuration objects by loading viewmodels/templates via arbitrary logic.
var defaultConfigRegistry = {};
ko.components.register = function(componentName, config) {
if (!config) {
throw new Error('Invalid configuration for ' + componentName);
}
if (ko.components.isRegistered(componentName)) {
throw new Error('Component ' + componentName + ' is already registered');
}
defaultConfigRegistry[componentName] = config;
}
ko.components.isRegistered = function(componentName) {
return componentName in defaultConfigRegistry;
}
ko.components.unregister = function(componentName) {
delete defaultConfigRegistry[componentName];
ko.components.clearCachedDefinition(componentName);
}
ko.components.defaultLoader = {
'getConfig': function(componentName, callback) {
var result = defaultConfigRegistry.hasOwnProperty(componentName)
? defaultConfigRegistry[componentName]
: null;
callback(result);
},
'loadComponent': function(componentName, config, callback) {
var errorCallback = makeErrorCallback(componentName);
possiblyGetConfigFromAmd(errorCallback, config, function(loadedConfig) {
resolveConfig(componentName, errorCallback, loadedConfig, callback);
});
},
'loadTemplate': function(componentName, templateConfig, callback) {
resolveTemplate(makeErrorCallback(componentName), templateConfig, callback);
},
'loadViewModel': function(componentName, viewModelConfig, callback) {
resolveViewModel(makeErrorCallback(componentName), viewModelConfig, callback);
}
};
var createViewModelKey = 'createViewModel';
// Takes a config object of the form { template: ..., viewModel: ... }, and asynchronously convert it
// into the standard component definition format:
// { template: <ArrayOfDomNodes>, createViewModel: function(params, componentInfo) { ... } }.
// Since both template and viewModel may need to be resolved asynchronously, both tasks are performed
// in parallel, and the results joined when both are ready. We don't depend on any promises infrastructure,
// so this is implemented manually below.
function resolveConfig(componentName, errorCallback, config, callback) {
var result = {},
makeCallBackWhenZero = 2,
tryIssueCallback = function() {
if (--makeCallBackWhenZero === 0) {
callback(result);
}
},
templateConfig = config['template'],
viewModelConfig = config['viewModel'];
if (templateConfig) {
possiblyGetConfigFromAmd(errorCallback, templateConfig, function(loadedConfig) {
ko.components._getFirstResultFromLoaders('loadTemplate', [componentName, loadedConfig], function(resolvedTemplate) {
result['template'] = resolvedTemplate;
tryIssueCallback();
});
});
} else {
tryIssueCallback();
}
if (viewModelConfig) {
possiblyGetConfigFromAmd(errorCallback, viewModelConfig, function(loadedConfig) {
ko.components._getFirstResultFromLoaders('loadViewModel', [componentName, loadedConfig], function(resolvedViewModel) {
result[createViewModelKey] = resolvedViewModel;
tryIssueCallback();
});
});
} else {
tryIssueCallback();
}
}
function resolveTemplate(errorCallback, templateConfig, callback) {
if (typeof templateConfig === 'string') {
// Markup - parse it
callback(ko.utils.parseHtmlFragment(templateConfig));
} else if (templateConfig instanceof Array) {
// Assume already an array of DOM nodes - pass through unchanged
callback(templateConfig);
} else if (isDocumentFragment(templateConfig)) {
// Document fragment - use its child nodes
callback(ko.utils.makeArray(templateConfig.childNodes));
} else if (templateConfig['element']) {
var element = templateConfig['element'];
if (isDomElement(element)) {
// Element instance - copy its child nodes
callback(cloneNodesFromTemplateSourceElement(element));
} else if (typeof element === 'string') {
// Element ID - find it, then copy its child nodes
var elemInstance = document.getElementById(element);
if (elemInstance) {
callback(cloneNodesFromTemplateSourceElement(elemInstance));
} else {
errorCallback('Cannot find element with ID ' + element);
}
} else {
errorCallback('Unknown element type: ' + element);
}
} else {
errorCallback('Unknown template value: ' + templateConfig);
}
}
function resolveViewModel(errorCallback, viewModelConfig, callback) {
if (typeof viewModelConfig === 'function') {
// Constructor - convert to standard factory function format
// By design, this does *not* supply componentInfo to the constructor, as the intent is that
// componentInfo contains non-viewmodel data (e.g., the component's element) that should only
// be used in factory functions, not viewmodel constructors.
callback(function (params /*, componentInfo */) {
return new viewModelConfig(params);
});
} else if (typeof viewModelConfig[createViewModelKey] === 'function') {
// Already a factory function - use it as-is
callback(viewModelConfig[createViewModelKey]);
} else if ('instance' in viewModelConfig) {
// Fixed object instance - promote to createViewModel format for API consistency
var fixedInstance = viewModelConfig['instance'];
callback(function (params, componentInfo) {
return fixedInstance;
});
} else if ('viewModel' in viewModelConfig) {
// Resolved AMD module whose value is of the form { viewModel: ... }
resolveViewModel(errorCallback, viewModelConfig['viewModel'], callback);
} else {
errorCallback('Unknown viewModel value: ' + viewModelConfig);
}
}
function cloneNodesFromTemplateSourceElement(elemInstance) {
switch (ko.utils.tagNameLower(elemInstance)) {
case 'script':
return ko.utils.parseHtmlFragment(elemInstance.text);
case 'textarea':
return ko.utils.parseHtmlFragment(elemInstance.value);
case 'template':
// For browsers with proper <template> element support (i.e., where the .content property
// gives a document fragment), use that document fragment.
if (isDocumentFragment(elemInstance.content)) {
return ko.utils.cloneNodes(elemInstance.content.childNodes);
}
}
// Regular elements such as <div>, and <template> elements on old browsers that don't really
// understand <template> and just treat it as a regular container
return ko.utils.cloneNodes(elemInstance.childNodes);
}
function isDomElement(obj) {
if (window['HTMLElement']) {
return obj instanceof HTMLElement;
} else {
return obj && obj.tagName && obj.nodeType === 1;
}
}
function isDocumentFragment(obj) {
if (window['DocumentFragment']) {
return obj instanceof DocumentFragment;
} else {
return obj && obj.nodeType === 11;
}
}
function possiblyGetConfigFromAmd(errorCallback, config, callback) {
if (typeof config['require'] === 'string') {
// The config is the value of an AMD module
if (amdRequire || window['require']) {
(amdRequire || window['require'])([config['require']], callback);
} else {
errorCallback('Uses require, but no AMD loader is present');
}
} else {
callback(config);
}
}
function makeErrorCallback(componentName) {
return function (message) {
throw new Error('Component \'' + componentName + '\': ' + message);
};
}
ko.exportSymbol('components.register', ko.components.register);
ko.exportSymbol('components.isRegistered', ko.components.isRegistered);
ko.exportSymbol('components.unregister', ko.components.unregister);
// Expose the default loader so that developers can directly ask it for configuration
// or to resolve configuration
ko.exportSymbol('components.defaultLoader', ko.components.defaultLoader);
// By default, the default loader is the only registered component loader
ko.components['loaders'].push(ko.components.defaultLoader);
// Privately expose the underlying config registry for use in old-IE shim
ko.components._allRegisteredComponents = defaultConfigRegistry;
})();
(function (undefined) {
// Overridable API for determining which component name applies to a given node. By overriding this,
// you can for example map specific tagNames to components that are not preregistered.
ko.components['getComponentNameForNode'] = function(node) {
var tagNameLower = ko.utils.tagNameLower(node);
return ko.components.isRegistered(tagNameLower) && tagNameLower;
};
ko.components.addBindingsForCustomElement = function(allBindings, node, bindingContext, valueAccessors) {
// Determine if it's really a custom element matching a component
if (node.nodeType === 1) {
var componentName = ko.components['getComponentNameForNode'](node);
if (componentName) {
// It does represent a component, so add a component binding for it
allBindings = allBindings || {};
if (allBindings['component']) {
// Avoid silently overwriting some other 'component' binding that may already be on the element
throw new Error('Cannot use the "component" binding on a custom element matching a component');
}
var componentBindingValue = { 'name': componentName, 'params': getComponentParamsFromCustomElement(node, bindingContext) };
allBindings['component'] = valueAccessors
? function() { return componentBindingValue; }
: componentBindingValue;
}
}
return allBindings;
}
var nativeBindingProviderInstance = new ko.bindingProvider();
function getComponentParamsFromCustomElement(elem, bindingContext) {
var paramsAttribute = elem.getAttribute('params');
if (paramsAttribute) {
var params = nativeBindingProviderInstance['parseBindingsString'](paramsAttribute, bindingContext, elem, { 'valueAccessors': true, 'bindingParams': true }),
rawParamComputedValues = ko.utils.objectMap(params, function(paramValue, paramName) {
return ko.computed(paramValue, null, { disposeWhenNodeIsRemoved: elem });
}),
result = ko.utils.objectMap(rawParamComputedValues, function(paramValueComputed, paramName) {
var paramValue = paramValueComputed.peek();
// Does the evaluation of the parameter value unwrap any observables?
if (!paramValueComputed.isActive()) {
// No it doesn't, so there's no need for any computed wrapper. Just pass through the supplied value directly.
// Example: "someVal: firstName, age: 123" (whether or not firstName is an observable/computed)
return paramValue;
} else {
// Yes it does. Supply a computed property that unwraps both the outer (binding expression)
// level of observability, and any inner (resulting model value) level of observability.
// This means the component doesn't have to worry about multiple unwrapping. If the value is a
// writable observable, the computed will also be writable and pass the value on to the observable.
return ko.computed({
'read': function() {
return ko.utils.unwrapObservable(paramValueComputed());
},
'write': ko.isWriteableObservable(paramValue) && function(value) {
paramValueComputed()(value);
},
disposeWhenNodeIsRemoved: elem
});
}
});
// Give access to the raw computeds, as long as that wouldn't overwrite any custom param also called '$raw'
// This is in case the developer wants to react to outer (binding) observability separately from inner
// (model value) observability, or in case the model value observable has subobservables.
if (!result.hasOwnProperty('$raw')) {
result['$raw'] = rawParamComputedValues;
}
return result;
} else {
// For consistency, absence of a "params" attribute is treated the same as the presence of
// any empty one. Otherwise component viewmodels need special code to check whether or not
// 'params' or 'params.$raw' is null/undefined before reading subproperties, which is annoying.
return { '$raw': {} };
}
}
// --------------------------------------------------------------------------------
// Compatibility code for older (pre-HTML5) IE browsers
if (ko.utils.ieVersion < 9) {
// Whenever you preregister a component, enable it as a custom element in the current document
ko.components['register'] = (function(originalFunction) {
return function(componentName) {
document.createElement(componentName); // Allows IE<9 to parse markup containing the custom element
return originalFunction.apply(this, arguments);
}
})(ko.components['register']);
// Whenever you create a document fragment, enable all preregistered component names as custom elements
// This is needed to make innerShiv/jQuery HTML parsing correctly handle the custom elements
document.createDocumentFragment = (function(originalFunction) {
return function() {
var newDocFrag = originalFunction(),
allComponents = ko.components._allRegisteredComponents;
for (var componentName in allComponents) {
if (allComponents.hasOwnProperty(componentName)) {
newDocFrag.createElement(componentName);
}
}
return newDocFrag;
};
})(document.createDocumentFragment);
}
})();(function(undefined) {
var componentLoadingOperationUniqueId = 0;
ko.bindingHandlers['component'] = {
'init': function(element, valueAccessor, ignored1, ignored2, bindingContext) {
var currentViewModel,
currentLoadingOperationId,
disposeAssociatedComponentViewModel = function () {
var currentViewModelDispose = currentViewModel && currentViewModel['dispose'];
if (typeof currentViewModelDispose === 'function') {
currentViewModelDispose.call(currentViewModel);
}
// Any in-flight loading operation is no longer relevant, so make sure we ignore its completion
currentLoadingOperationId = null;
},
originalChildNodes = ko.utils.makeArray(ko.virtualElements.childNodes(element));
ko.utils.domNodeDisposal.addDisposeCallback(element, disposeAssociatedComponentViewModel);
ko.computed(function () {
var value = ko.utils.unwrapObservable(valueAccessor()),
componentName, componentParams;
if (typeof value === 'string') {
componentName = value;
} else {
componentName = ko.utils.unwrapObservable(value['name']);
componentParams = ko.utils.unwrapObservable(value['params']);
}
if (!componentName) {
throw new Error('No component name specified');
}
var loadingOperationId = currentLoadingOperationId = ++componentLoadingOperationUniqueId;
ko.components.get(componentName, function(componentDefinition) {
// If this is not the current load operation for this element, ignore it.
if (currentLoadingOperationId !== loadingOperationId) {
return;
}
// Clean up previous state
disposeAssociatedComponentViewModel();
// Instantiate and bind new component. Implicitly this cleans any old DOM nodes.
if (!componentDefinition) {
throw new Error('Unknown component \'' + componentName + '\'');
}
cloneTemplateIntoElement(componentName, componentDefinition, element);
var componentViewModel = createViewModel(componentDefinition, element, originalChildNodes, componentParams),
childBindingContext = bindingContext['createChildContext'](componentViewModel, /* dataItemAlias */ undefined, function(ctx) {
ctx['$component'] = componentViewModel;
ctx['$componentTemplateNodes'] = originalChildNodes;
});
currentViewModel = componentViewModel;
ko.applyBindingsToDescendants(childBindingContext, element);
});
}, null, { disposeWhenNodeIsRemoved: element });
return { 'controlsDescendantBindings': true };
}
};
ko.virtualElements.allowedBindings['component'] = true;
function cloneTemplateIntoElement(componentName, componentDefinition, element) {
var template = componentDefinition['template'];
if (!template) {
throw new Error('Component \'' + componentName + '\' has no template');
}
var clonedNodesArray = ko.utils.cloneNodes(template);
ko.virtualElements.setDomNodeChildren(element, clonedNodesArray);
}
function createViewModel(componentDefinition, element, originalChildNodes, componentParams) {
var componentViewModelFactory = componentDefinition['createViewModel'];
return componentViewModelFactory
? componentViewModelFactory.call(componentDefinition, componentParams, { 'element': element, 'templateNodes': originalChildNodes })
: componentParams; // Template-only component
}
})();
var attrHtmlToJavascriptMap = { 'class': 'className', 'for': 'htmlFor' };
ko.bindingHandlers['attr'] = {
'update': function(element, valueAccessor, allBindings) {
var value = ko.utils.unwrapObservable(valueAccessor()) || {};
ko.utils.objectForEach(value, function(attrName, attrValue) {
attrValue = ko.utils.unwrapObservable(attrValue);
// To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely
// when someProp is a "no value"-like value (strictly null, false, or undefined)
// (because the absence of the "checked" attr is how to mark an element as not checked, etc.)
var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined);
if (toRemove)
element.removeAttribute(attrName);
// In IE <= 7 and IE8 Quirks Mode, you have to use the Javascript property name instead of the
// HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior,
// but instead of figuring out the mode, we'll just set the attribute through the Javascript
// property for IE <= 8.
if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavascriptMap) {
attrName = attrHtmlToJavascriptMap[attrName];
if (toRemove)
element.removeAttribute(attrName);
else
element[attrName] = attrValue;
} else if (!toRemove) {
element.setAttribute(attrName, attrValue.toString());
}
// Treat "name" specially - although you can think of it as an attribute, it also needs
// special handling on older versions of IE (https://github.com/SteveSanderson/knockout/pull/333)
// Deliberately being case-sensitive here because XHTML would regard "Name" as a different thing
// entirely, and there's no strong reason to allow for such casing in HTML.
if (attrName === "name") {
ko.utils.setElementName(element, toRemove ? "" : attrValue.toString());
}
});
}
};
(function() {
ko.bindingHandlers['checked'] = {
'after': ['value', 'attr'],
'init': function (element, valueAccessor, allBindings) {
var checkedValue = ko.pureComputed(function() {
// Treat "value" like "checkedValue" when it is included with "checked" binding
if (allBindings['has']('checkedValue')) {
return ko.utils.unwrapObservable(allBindings.get('checkedValue'));
} else if (allBindings['has']('value')) {
return ko.utils.unwrapObservable(allBindings.get('value'));
}
return element.value;
});
function updateModel() {
// This updates the model value from the view value.
// It runs in response to DOM events (click) and changes in checkedValue.
var isChecked = element.checked,
elemValue = useCheckedValue ? checkedValue() : isChecked;
// When we're first setting up this computed, don't change any model state.
if (ko.computedContext.isInitial()) {
return;
}
// We can ignore unchecked radio buttons, because some other radio
// button will be getting checked, and that one can take care of updating state.
if (isRadio && !isChecked) {
return;
}
var modelValue = ko.dependencyDetection.ignore(valueAccessor);
if (isValueArray) {
if (oldElemValue !== elemValue) {
// When we're responding to the checkedValue changing, and the element is
// currently checked, replace the old elem value with the new elem value
// in the model array.
if (isChecked) {
ko.utils.addOrRemoveItem(modelValue, elemValue, true);
ko.utils.addOrRemoveItem(modelValue, oldElemValue, false);
}
oldElemValue = elemValue;
} else {
// When we're responding to the user having checked/unchecked a checkbox,
// add/remove the element value to the model array.
ko.utils.addOrRemoveItem(modelValue, elemValue, isChecked);
}
} else {
ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'checked', elemValue, true);
}
};
function updateView() {
// This updates the view value from the model value.
// It runs in response to changes in the bound (checked) value.
var modelValue = ko.utils.unwrapObservable(valueAccessor());
if (isValueArray) {
// When a checkbox is bound to an array, being checked represents its value being present in that array
element.checked = ko.utils.arrayIndexOf(modelValue, checkedValue()) >= 0;
} else if (isCheckbox) {
// When a checkbox is bound to any other value (not an array), being checked represents the value being trueish
element.checked = modelValue;
} else {
// For radio buttons, being checked means that the radio button's value corresponds to the model value
element.checked = (checkedValue() === modelValue);
}
};
var isCheckbox = element.type == "checkbox",
isRadio = element.type == "radio";
// Only bind to check boxes and radio buttons
if (!isCheckbox && !isRadio) {
return;
}
var isValueArray = isCheckbox && (ko.utils.unwrapObservable(valueAccessor()) instanceof Array),
oldElemValue = isValueArray ? checkedValue() : undefined,
useCheckedValue = isRadio || isValueArray;
// IE 6 won't allow radio buttons to be selected unless they have a name
if (isRadio && !element.name)
ko.bindingHandlers['uniqueName']['init'](element, function() { return true });
// Set up two computeds to update the binding:
// The first responds to changes in the checkedValue value and to element clicks
ko.computed(updateModel, null, { disposeWhenNodeIsRemoved: element });
ko.utils.registerEventHandler(element, "click", updateModel);
// The second responds to changes in the model value (the one associated with the checked binding)
ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });
}
};
ko.expressionRewriting.twoWayBindings['checked'] = true;
ko.bindingHandlers['checkedValue'] = {
'update': function (element, valueAccessor) {
element.value = ko.utils.unwrapObservable(valueAccessor());
}
};
})();var classesWrittenByBindingKey = '__ko__cssValue';
ko.bindingHandlers['css'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
if (value !== null && typeof value == "object") {
ko.utils.objectForEach(value, function(className, shouldHaveClass) {
shouldHaveClass = ko.utils.unwrapObservable(shouldHaveClass);
ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);
});
} else {
value = String(value || ''); // Make sure we don't try to store or set a non-string value
ko.utils.toggleDomNodeCssClass(element, element[classesWrittenByBindingKey], false);
element[classesWrittenByBindingKey] = value;
ko.utils.toggleDomNodeCssClass(element, value, true);
}
}
};
ko.bindingHandlers['enable'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
if (value && element.disabled)
element.removeAttribute("disabled");
else if ((!value) && (!element.disabled))
element.disabled = true;
}
};
ko.bindingHandlers['disable'] = {
'update': function (element, valueAccessor) {
ko.bindingHandlers['enable']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()) });
}
};
// For certain common events (currently just 'click'), allow a simplified data-binding syntax
// e.g. click:handler instead of the usual full-length event:{click:handler}
function makeEventHandlerShortcut(eventName) {
ko.bindingHandlers[eventName] = {
'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
var newValueAccessor = function () {
var result = {};
result[eventName] = valueAccessor();
return result;
};
return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindings, viewModel, bindingContext);
}
}
}
ko.bindingHandlers['event'] = {
'init' : function (element, valueAccessor, allBindings, viewModel, bindingContext) {
var eventsToHandle = valueAccessor() || {};
ko.utils.objectForEach(eventsToHandle, function(eventName) {
if (typeof eventName == "string") {
ko.utils.registerEventHandler(element, eventName, function (event) {
var handlerReturnValue;
var handlerFunction = valueAccessor()[eventName];
if (!handlerFunction)
return;
try {
// Take all the event args, and prefix with the viewmodel
var argsForHandler = ko.utils.makeArray(arguments);
viewModel = bindingContext['$data'];
argsForHandler.unshift(viewModel);
handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);
} finally {
if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
if (event.preventDefault)
event.preventDefault();
else
event.returnValue = false;
}
}
var bubble = allBindings.get(eventName + 'Bubble') !== false;
if (!bubble) {
event.cancelBubble = true;
if (event.stopPropagation)
event.stopPropagation();
}
});
}
});
}
};
// "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"
// "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"
ko.bindingHandlers['foreach'] = {
makeTemplateValueAccessor: function(valueAccessor) {
return function() {
var modelValue = valueAccessor(),
unwrappedValue = ko.utils.peekObservable(modelValue); // Unwrap without setting a dependency here
// If unwrappedValue is the array, pass in the wrapped value on its own
// The value will be unwrapped and tracked within the template binding
// (See https://github.com/SteveSanderson/knockout/issues/523)
if ((!unwrappedValue) || typeof unwrappedValue.length == "number")
return { 'foreach': modelValue, 'templateEngine': ko.nativeTemplateEngine.instance };
// If unwrappedValue.data is the array, preserve all relevant options and unwrap again value so we get updates
ko.utils.unwrapObservable(modelValue);
return {
'foreach': unwrappedValue['data'],
'as': unwrappedValue['as'],
'includeDestroyed': unwrappedValue['includeDestroyed'],
'afterAdd': unwrappedValue['afterAdd'],
'beforeRemove': unwrappedValue['beforeRemove'],
'afterRender': unwrappedValue['afterRender'],
'beforeMove': unwrappedValue['beforeMove'],
'afterMove': unwrappedValue['afterMove'],
'templateEngine': ko.nativeTemplateEngine.instance
};
};
},
'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
},
'update': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindings, viewModel, bindingContext);
}
};
ko.expressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings
ko.virtualElements.allowedBindings['foreach'] = true;
var hasfocusUpdatingProperty = '__ko_hasfocusUpdating';
var hasfocusLastValue = '__ko_hasfocusLastValue';
ko.bindingHandlers['hasfocus'] = {
'init': function(element, valueAccessor, allBindings) {
var handleElementFocusChange = function(isFocused) {
// Where possible, ignore which event was raised and determine focus state using activeElement,
// as this avoids phantom focus/blur events raised when changing tabs in modern browsers.
// However, not all KO-targeted browsers (Firefox 2) support activeElement. For those browsers,
// prevent a loss of focus when changing tabs/windows by setting a flag that prevents hasfocus
// from calling 'blur()' on the element when it loses focus.
// Discussion at https://github.com/SteveSanderson/knockout/pull/352
element[hasfocusUpdatingProperty] = true;
var ownerDoc = element.ownerDocument;
if ("activeElement" in ownerDoc) {
var active;
try {
active = ownerDoc.activeElement;
} catch(e) {
// IE9 throws if you access activeElement during page load (see issue #703)
active = ownerDoc.body;
}
isFocused = (active === element);
}
var modelValue = valueAccessor();
ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'hasfocus', isFocused, true);
//cache the latest value, so we can avoid unnecessarily calling focus/blur in the update function
element[hasfocusLastValue] = isFocused;
element[hasfocusUpdatingProperty] = false;
};
var handleElementFocusIn = handleElementFocusChange.bind(null, true);
var handleElementFocusOut = handleElementFocusChange.bind(null, false);
ko.utils.registerEventHandler(element, "focus", handleElementFocusIn);
ko.utils.registerEventHandler(element, "focusin", handleElementFocusIn); // For IE
ko.utils.registerEventHandler(element, "blur", handleElementFocusOut);
ko.utils.registerEventHandler(element, "focusout", handleElementFocusOut); // For IE
},
'update': function(element, valueAccessor) {
var value = !!ko.utils.unwrapObservable(valueAccessor()); //force boolean to compare with last value
if (!element[hasfocusUpdatingProperty] && element[hasfocusLastValue] !== value) {
value ? element.focus() : element.blur();
ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, value ? "focusin" : "focusout"]); // For IE, which doesn't reliably fire "focus" or "blur" events synchronously
}
}
};
ko.expressionRewriting.twoWayBindings['hasfocus'] = true;
ko.bindingHandlers['hasFocus'] = ko.bindingHandlers['hasfocus']; // Make "hasFocus" an alias
ko.expressionRewriting.twoWayBindings['hasFocus'] = true;
ko.bindingHandlers['html'] = {
'init': function() {
// Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)
return { 'controlsDescendantBindings': true };
},
'update': function (element, valueAccessor) {
// setHtml will unwrap the value if needed
ko.utils.setHtml(element, valueAccessor());
}
};
// Makes a binding like with or if
function makeWithIfBinding(bindingKey, isWith, isNot, makeContextCallback) {
ko.bindingHandlers[bindingKey] = {
'init': function(element, valueAccessor, allBindings, viewModel, bindingContext) {
var didDisplayOnLastUpdate,
savedNodes;
ko.computed(function() {
var dataValue = ko.utils.unwrapObservable(valueAccessor()),
shouldDisplay = !isNot !== !dataValue, // equivalent to isNot ? !dataValue : !!dataValue
isFirstRender = !savedNodes,
needsRefresh = isFirstRender || isWith || (shouldDisplay !== didDisplayOnLastUpdate);
if (needsRefresh) {
// Save a copy of the inner nodes on the initial update, but only if we have dependencies.
if (isFirstRender && ko.computedContext.getDependenciesCount()) {
savedNodes = ko.utils.cloneNodes(ko.virtualElements.childNodes(element), true /* shouldCleanNodes */);
}
if (shouldDisplay) {
if (!isFirstRender) {
ko.virtualElements.setDomNodeChildren(element, ko.utils.cloneNodes(savedNodes));
}
ko.applyBindingsToDescendants(makeContextCallback ? makeContextCallback(bindingContext, dataValue) : bindingContext, element);
} else {
ko.virtualElements.emptyNode(element);
}
didDisplayOnLastUpdate = shouldDisplay;
}
}, null, { disposeWhenNodeIsRemoved: element });
return { 'controlsDescendantBindings': true };
}
};
ko.expressionRewriting.bindingRewriteValidators[bindingKey] = false; // Can't rewrite control flow bindings
ko.virtualElements.allowedBindings[bindingKey] = true;
}
// Construct the actual binding handlers
makeWithIfBinding('if');
makeWithIfBinding('ifnot', false /* isWith */, true /* isNot */);
makeWithIfBinding('with', true /* isWith */, false /* isNot */,
function(bindingContext, dataValue) {
return bindingContext['createChildContext'](dataValue);
}
);
var captionPlaceholder = {};
ko.bindingHandlers['options'] = {
'init': function(element) {
if (ko.utils.tagNameLower(element) !== "select")
throw new Error("options binding applies only to SELECT elements");
// Remove all existing <option>s.
while (element.length > 0) {
element.remove(0);
}
// Ensures that the binding processor doesn't try to bind the options
return { 'controlsDescendantBindings': true };
},
'update': function (element, valueAccessor, allBindings) {
function selectedOptions() {
return ko.utils.arrayFilter(element.options, function (node) { return node.selected; });
}
var selectWasPreviouslyEmpty = element.length == 0,
multiple = element.multiple,
previousScrollTop = (!selectWasPreviouslyEmpty && multiple) ? element.scrollTop : null,
unwrappedArray = ko.utils.unwrapObservable(valueAccessor()),
valueAllowUnset = allBindings.get('valueAllowUnset') && allBindings['has']('value'),
includeDestroyed = allBindings.get('optionsIncludeDestroyed'),
arrayToDomNodeChildrenOptions = {},
captionValue,
filteredArray,
previousSelectedValues = [];
if (!valueAllowUnset) {
if (multiple) {
previousSelectedValues = ko.utils.arrayMap(selectedOptions(), ko.selectExtensions.readValue);
} else if (element.selectedIndex >= 0) {
previousSelectedValues.push(ko.selectExtensions.readValue(element.options[element.selectedIndex]));
}
}
if (unwrappedArray) {
if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
unwrappedArray = [unwrappedArray];
// Filter out any entries marked as destroyed
filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
return includeDestroyed || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
});
// If caption is included, add it to the array
if (allBindings['has']('optionsCaption')) {
captionValue = ko.utils.unwrapObservable(allBindings.get('optionsCaption'));
// If caption value is null or undefined, don't show a caption
if (captionValue !== null && captionValue !== undefined) {
filteredArray.unshift(captionPlaceholder);
}
}
} else {
// If a falsy value is provided (e.g. null), we'll simply empty the select element
}
function applyToObject(object, predicate, defaultValue) {
var predicateType = typeof predicate;
if (predicateType == "function") // Given a function; run it against the data value
return predicate(object);
else if (predicateType == "string") // Given a string; treat it as a property name on the data value
return object[predicate];
else // Given no optionsText arg; use the data value itself
return defaultValue;
}
// The following functions can run at two different times:
// The first is when the whole array is being updated directly from this binding handler.
// The second is when an observable value for a specific array entry is updated.
// oldOptions will be empty in the first case, but will be filled with the previously generated option in the second.
var itemUpdate = false;
function optionForArrayItem(arrayEntry, index, oldOptions) {
if (oldOptions.length) {
previousSelectedValues = !valueAllowUnset && oldOptions[0].selected ? [ ko.selectExtensions.readValue(oldOptions[0]) ] : [];
itemUpdate = true;
}
var option = element.ownerDocument.createElement("option");
if (arrayEntry === captionPlaceholder) {
ko.utils.setTextContent(option, allBindings.get('optionsCaption'));
ko.selectExtensions.writeValue(option, undefined);
} else {
// Apply a value to the option element
var optionValue = applyToObject(arrayEntry, allBindings.get('optionsValue'), arrayEntry);
ko.selectExtensions.writeValue(option, ko.utils.unwrapObservable(optionValue));
// Apply some text to the option element
var optionText = applyToObject(arrayEntry, allBindings.get('optionsText'), optionValue);
ko.utils.setTextContent(option, optionText);
}
return [option];
}
// By using a beforeRemove callback, we delay the removal until after new items are added. This fixes a selection
// problem in IE<=8 and Firefox. See https://github.com/knockout/knockout/issues/1208
arrayToDomNodeChildrenOptions['beforeRemove'] =
function (option) {
element.removeChild(option);
};
function setSelectionCallback(arrayEntry, newOptions) {
if (itemUpdate && valueAllowUnset) {
// The model value is authoritative, so make sure its value is the one selected
// There is no need to use dependencyDetection.ignore since setDomNodeChildrenFromArrayMapping does so already.
ko.selectExtensions.writeValue(element, ko.utils.unwrapObservable(allBindings.get('value')), true /* allowUnset */);
} else if (previousSelectedValues.length) {
// IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document.
// That's why we first added them without selection. Now it's time to set the selection.
var isSelected = ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[0])) >= 0;
ko.utils.setOptionNodeSelectionState(newOptions[0], isSelected);
// If this option was changed from being selected during a single-item update, notify the change
if (itemUpdate && !isSelected) {
ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
}
}
}
var callback = setSelectionCallback;
if (allBindings['has']('optionsAfterRender') && typeof allBindings.get('optionsAfterRender') == "function") {
callback = function(arrayEntry, newOptions) {
setSelectionCallback(arrayEntry, newOptions);
ko.dependencyDetection.ignore(allBindings.get('optionsAfterRender'), null, [newOptions[0], arrayEntry !== captionPlaceholder ? arrayEntry : undefined]);
}
}
ko.utils.setDomNodeChildrenFromArrayMapping(element, filteredArray, optionForArrayItem, arrayToDomNodeChildrenOptions, callback);
ko.dependencyDetection.ignore(function () {
if (valueAllowUnset) {
// The model value is authoritative, so make sure its value is the one selected
ko.selectExtensions.writeValue(element, ko.utils.unwrapObservable(allBindings.get('value')), true /* allowUnset */);
} else {
// Determine if the selection has changed as a result of updating the options list
var selectionChanged;
if (multiple) {
// For a multiple-select box, compare the new selection count to the previous one
// But if nothing was selected before, the selection can't have changed
selectionChanged = previousSelectedValues.length && selectedOptions().length < previousSelectedValues.length;
} else {
// For a single-select box, compare the current value to the previous value
// But if nothing was selected before or nothing is selected now, just look for a change in selection
selectionChanged = (previousSelectedValues.length && element.selectedIndex >= 0)
? (ko.selectExtensions.readValue(element.options[element.selectedIndex]) !== previousSelectedValues[0])
: (previousSelectedValues.length || element.selectedIndex >= 0);
}
// Ensure consistency between model value and selected option.
// If the dropdown was changed so that selection is no longer the same,
// notify the value or selectedOptions binding.
if (selectionChanged) {
ko.utils.triggerEvent(element, "change");
}
}
});
// Workaround for IE bug
ko.utils.ensureSelectElementIsRenderedCorrectly(element);
if (previousScrollTop && Math.abs(previousScrollTop - element.scrollTop) > 20)
element.scrollTop = previousScrollTop;
}
};
ko.bindingHandlers['options'].optionValueDomDataKey = ko.utils.domData.nextKey();
ko.bindingHandlers['selectedOptions'] = {
'after': ['options', 'foreach'],
'init': function (element, valueAccessor, allBindings) {
ko.utils.registerEventHandler(element, "change", function () {
var value = valueAccessor(), valueToWrite = [];
ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
if (node.selected)
valueToWrite.push(ko.selectExtensions.readValue(node));
});
ko.expressionRewriting.writeValueToProperty(value, allBindings, 'selectedOptions', valueToWrite);
});
},
'update': function (element, valueAccessor) {
if (ko.utils.tagNameLower(element) != "select")
throw new Error("values binding applies only to SELECT elements");
var newValue = ko.utils.unwrapObservable(valueAccessor());
if (newValue && typeof newValue.length == "number") {
ko.utils.arrayForEach(element.getElementsByTagName("option"), function(node) {
var isSelected = ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0;
ko.utils.setOptionNodeSelectionState(node, isSelected);
});
}
}
};
ko.expressionRewriting.twoWayBindings['selectedOptions'] = true;
ko.bindingHandlers['style'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor() || {});
ko.utils.objectForEach(value, function(styleName, styleValue) {
styleValue = ko.utils.unwrapObservable(styleValue);
if (styleValue === null || styleValue === undefined || styleValue === false) {
// Empty string removes the value, whereas null/undefined have no effect
styleValue = "";
}
element.style[styleName] = styleValue;
});
}
};
ko.bindingHandlers['submit'] = {
'init': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
if (typeof valueAccessor() != "function")
throw new Error("The value for a submit binding must be a function");
ko.utils.registerEventHandler(element, "submit", function (event) {
var handlerReturnValue;
var value = valueAccessor();
try { handlerReturnValue = value.call(bindingContext['$data'], element); }
finally {
if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
if (event.preventDefault)
event.preventDefault();
else
event.returnValue = false;
}
}
});
}
};
ko.bindingHandlers['text'] = {
'init': function() {
// Prevent binding on the dynamically-injected text node (as developers are unlikely to expect that, and it has security implications).
// It should also make things faster, as we no longer have to consider whether the text node might be bindable.
return { 'controlsDescendantBindings': true };
},
'update': function (element, valueAccessor) {
ko.utils.setTextContent(element, valueAccessor());
}
};
ko.virtualElements.allowedBindings['text'] = true;
(function () {
if (window && window.navigator) {
var parseVersion = function (matches) {
if (matches) {
return parseFloat(matches[1]);
}
};
// Detect various browser versions because some old versions don't fully support the 'input' event
var operaVersion = window.opera && window.opera.version && parseInt(window.opera.version()),
userAgent = window.navigator.userAgent,
safariVersion = parseVersion(userAgent.match(/^(?:(?!chrome).)*version\/([^ ]*) safari/i)),
firefoxVersion = parseVersion(userAgent.match(/Firefox\/([^ ]*)/));
}
// IE 8 and 9 have bugs that prevent the normal events from firing when the value changes.
// But it does fire the 'selectionchange' event on many of those, presumably because the
// cursor is moving and that counts as the selection changing. The 'selectionchange' event is
// fired at the document level only and doesn't directly indicate which element changed. We
// set up just one event handler for the document and use 'activeElement' to determine which
// element was changed.
if (ko.utils.ieVersion < 10) {
var selectionChangeRegisteredName = ko.utils.domData.nextKey(),
selectionChangeHandlerName = ko.utils.domData.nextKey();
var selectionChangeHandler = function(event) {
var target = this.activeElement,
handler = target && ko.utils.domData.get(target, selectionChangeHandlerName);
if (handler) {
handler(event);
}
};
var registerForSelectionChangeEvent = function (element, handler) {
var ownerDoc = element.ownerDocument;
if (!ko.utils.domData.get(ownerDoc, selectionChangeRegisteredName)) {
ko.utils.domData.set(ownerDoc, selectionChangeRegisteredName, true);
ko.utils.registerEventHandler(ownerDoc, 'selectionchange', selectionChangeHandler);
}
ko.utils.domData.set(element, selectionChangeHandlerName, handler);
};
}
ko.bindingHandlers['textInput'] = {
'init': function (element, valueAccessor, allBindings) {
var previousElementValue = element.value,
timeoutHandle,
elementValueBeforeEvent;
var updateModel = function (event) {
clearTimeout(timeoutHandle);
elementValueBeforeEvent = timeoutHandle = undefined;
var elementValue = element.value;
if (previousElementValue !== elementValue) {
// Provide a way for tests to know exactly which event was processed
if (DEBUG && event) element['_ko_textInputProcessedEvent'] = event.type;
previousElementValue = elementValue;
ko.expressionRewriting.writeValueToProperty(valueAccessor(), allBindings, 'textInput', elementValue);
}
};
var deferUpdateModel = function (event) {
if (!timeoutHandle) {
// The elementValueBeforeEvent variable is set *only* during the brief gap between an
// event firing and the updateModel function running. This allows us to ignore model
// updates that are from the previous state of the element, usually due to techniques
// such as rateLimit. Such updates, if not ignored, can cause keystrokes to be lost.
elementValueBeforeEvent = element.value;
var handler = DEBUG ? updateModel.bind(element, {type: event.type}) : updateModel;
timeoutHandle = setTimeout(handler, 4);
}
};
var updateView = function () {
var modelValue = ko.utils.unwrapObservable(valueAccessor());
if (modelValue === null || modelValue === undefined) {
modelValue = '';
}
if (elementValueBeforeEvent !== undefined && modelValue === elementValueBeforeEvent) {
setTimeout(updateView, 4);
return;
}
// Update the element only if the element and model are different. On some browsers, updating the value
// will move the cursor to the end of the input, which would be bad while the user is typing.
if (element.value !== modelValue) {
previousElementValue = modelValue; // Make sure we ignore events (propertychange) that result from updating the value
element.value = modelValue;
}
};
var onEvent = function (event, handler) {
ko.utils.registerEventHandler(element, event, handler);
};
if (DEBUG && ko.bindingHandlers['textInput']['_forceUpdateOn']) {
// Provide a way for tests to specify exactly which events are bound
ko.utils.arrayForEach(ko.bindingHandlers['textInput']['_forceUpdateOn'], function(eventName) {
if (eventName.slice(0,5) == 'after') {
onEvent(eventName.slice(5), deferUpdateModel);
} else {
onEvent(eventName, updateModel);
}
});
} else {
if (ko.utils.ieVersion < 10) {
// Internet Explorer <= 8 doesn't support the 'input' event, but does include 'propertychange' that fires whenever
// any property of an element changes. Unlike 'input', it also fires if a property is changed from JavaScript code,
// but that's an acceptable compromise for this binding. IE 9 does support 'input', but since it doesn't fire it
// when using autocomplete, we'll use 'propertychange' for it also.
onEvent('propertychange', function(event) {
if (event.propertyName === 'value') {
updateModel(event);
}
});
if (ko.utils.ieVersion == 8) {
// IE 8 has a bug where it fails to fire 'propertychange' on the first update following a value change from
// JavaScript code. It also doesn't fire if you clear the entire value. To fix this, we bind to the following
// events too.
onEvent('keyup', updateModel); // A single keystoke
onEvent('keydown', updateModel); // The first character when a key is held down
}
if (ko.utils.ieVersion >= 8) {
// Internet Explorer 9 doesn't fire the 'input' event when deleting text, including using
// the backspace, delete, or ctrl-x keys, clicking the 'x' to clear the input, dragging text
// out of the field, and cutting or deleting text using the context menu. 'selectionchange'
// can detect all of those except dragging text out of the field, for which we use 'dragend'.
// These are also needed in IE8 because of the bug described above.
registerForSelectionChangeEvent(element, updateModel); // 'selectionchange' covers cut, paste, drop, delete, etc.
onEvent('dragend', deferUpdateModel);
}
} else {
// All other supported browsers support the 'input' event, which fires whenever the content of the element is changed
// through the user interface.
onEvent('input', updateModel);
if (safariVersion < 5 && ko.utils.tagNameLower(element) === "textarea") {
// Safari <5 doesn't fire the 'input' event for <textarea> elements (it does fire 'textInput'
// but only when typing). So we'll just catch as much as we can with keydown, cut, and paste.
onEvent('keydown', deferUpdateModel);
onEvent('paste', deferUpdateModel);
onEvent('cut', deferUpdateModel);
} else if (operaVersion < 11) {
// Opera 10 doesn't always fire the 'input' event for cut, paste, undo & drop operations.
// We can try to catch some of those using 'keydown'.
onEvent('keydown', deferUpdateModel);
} else if (firefoxVersion < 4.0) {
// Firefox <= 3.6 doesn't fire the 'input' event when text is filled in through autocomplete
onEvent('DOMAutoComplete', updateModel);
// Firefox <=3.5 doesn't fire the 'input' event when text is dropped into the input.
onEvent('dragdrop', updateModel); // <3.5
onEvent('drop', updateModel); // 3.5
}
}
}
// Bind to the change event so that we can catch programmatic updates of the value that fire this event.
onEvent('change', updateModel);
ko.computed(updateView, null, { disposeWhenNodeIsRemoved: element });
}
};
ko.expressionRewriting.twoWayBindings['textInput'] = true;
// textinput is an alias for textInput
ko.bindingHandlers['textinput'] = {
// preprocess is the only way to set up a full alias
'preprocess': function (value, name, addBinding) {
addBinding('textInput', value);
}
};
})();ko.bindingHandlers['uniqueName'] = {
'init': function (element, valueAccessor) {
if (valueAccessor()) {
var name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex);
ko.utils.setElementName(element, name);
}
}
};
ko.bindingHandlers['uniqueName'].currentIndex = 0;
ko.bindingHandlers['value'] = {
'after': ['options', 'foreach'],
'init': function (element, valueAccessor, allBindings) {
// If the value binding is placed on a radio/checkbox, then just pass through to checkedValue and quit
if (element.tagName.toLowerCase() == "input" && (element.type == "checkbox" || element.type == "radio")) {
ko.applyBindingAccessorsToNode(element, { 'checkedValue': valueAccessor });
return;
}
// Always catch "change" event; possibly other events too if asked
var eventsToCatch = ["change"];
var requestedEventsToCatch = allBindings.get("valueUpdate");
var propertyChangedFired = false;
var elementValueBeforeEvent = null;
if (requestedEventsToCatch) {
if (typeof requestedEventsToCatch == "string") // Allow both individual event names, and arrays of event names
requestedEventsToCatch = [requestedEventsToCatch];
ko.utils.arrayPushAll(eventsToCatch, requestedEventsToCatch);
eventsToCatch = ko.utils.arrayGetDistinctValues(eventsToCatch);
}
var valueUpdateHandler = function() {
elementValueBeforeEvent = null;
propertyChangedFired = false;
var modelValue = valueAccessor();
var elementValue = ko.selectExtensions.readValue(element);
ko.expressionRewriting.writeValueToProperty(modelValue, allBindings, 'value', elementValue);
}
// Workaround for https://github.com/SteveSanderson/knockout/issues/122
// IE doesn't fire "change" events on textboxes if the user selects a value from its autocomplete list
var ieAutoCompleteHackNeeded = ko.utils.ieVersion && element.tagName.toLowerCase() == "input" && element.type == "text"
&& element.autocomplete != "off" && (!element.form || element.form.autocomplete != "off");
if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, "propertychange") == -1) {
ko.utils.registerEventHandler(element, "propertychange", function () { propertyChangedFired = true });
ko.utils.registerEventHandler(element, "focus", function () { propertyChangedFired = false });
ko.utils.registerEventHandler(element, "blur", function() {
if (propertyChangedFired) {
valueUpdateHandler();
}
});
}
ko.utils.arrayForEach(eventsToCatch, function(eventName) {
// The syntax "after<eventname>" means "run the handler asynchronously after the event"
// This is useful, for example, to catch "keydown" events after the browser has updated the control
// (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)
var handler = valueUpdateHandler;
if (ko.utils.stringStartsWith(eventName, "after")) {
handler = function() {
// The elementValueBeforeEvent variable is non-null *only* during the brief gap between
// a keyX event firing and the valueUpdateHandler running, which is scheduled to happen
// at the earliest asynchronous opportunity. We store this temporary information so that
// if, between keyX and valueUpdateHandler, the underlying model value changes separately,
// we can overwrite that model value change with the value the user just typed. Otherwise,
// techniques like rateLimit can trigger model changes at critical moments that will
// override the user's inputs, causing keystrokes to be lost.
elementValueBeforeEvent = ko.selectExtensions.readValue(element);
setTimeout(valueUpdateHandler, 0);
};
eventName = eventName.substring("after".length);
}
ko.utils.registerEventHandler(element, eventName, handler);
});
var updateFromModel = function () {
var newValue = ko.utils.unwrapObservable(valueAccessor());
var elementValue = ko.selectExtensions.readValue(element);
if (elementValueBeforeEvent !== null && newValue === elementValueBeforeEvent) {
setTimeout(updateFromModel, 0);
return;
}
var valueHasChanged = (newValue !== elementValue);
if (valueHasChanged) {
if (ko.utils.tagNameLower(element) === "select") {
var allowUnset = allBindings.get('valueAllowUnset');
var applyValueAction = function () {
ko.selectExtensions.writeValue(element, newValue, allowUnset);
};
applyValueAction();
if (!allowUnset && newValue !== ko.selectExtensions.readValue(element)) {
// If you try to set a model value that can't be represented in an already-populated dropdown, reject that change,
// because you're not allowed to have a model value that disagrees with a visible UI selection.
ko.dependencyDetection.ignore(ko.utils.triggerEvent, null, [element, "change"]);
} else {
// Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread
// right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread
// to apply the value as well.
setTimeout(applyValueAction, 0);
}
} else {
ko.selectExtensions.writeValue(element, newValue);
}
}
};
ko.computed(updateFromModel, null, { disposeWhenNodeIsRemoved: element });
},
'update': function() {} // Keep for backwards compatibility with code that may have wrapped value binding
};
ko.expressionRewriting.twoWayBindings['value'] = true;
ko.bindingHandlers['visible'] = {
'update': function (element, valueAccessor) {
var value = ko.utils.unwrapObservable(valueAccessor());
var isCurrentlyVisible = !(element.style.display == "none");
if (value && !isCurrentlyVisible)
element.style.display = "";
else if ((!value) && isCurrentlyVisible)
element.style.display = "none";
}
};
// 'click' is just a shorthand for the usual full-length event:{click:handler}
makeEventHandlerShortcut('click');
// If you want to make a custom template engine,
//
// [1] Inherit from this class (like ko.nativeTemplateEngine does)
// [2] Override 'renderTemplateSource', supplying a function with this signature:
//
// function (templateSource, bindingContext, options) {
// // - templateSource.text() is the text of the template you should render
// // - bindingContext.$data is the data you should pass into the template
// // - you might also want to make bindingContext.$parent, bindingContext.$parents,
// // and bindingContext.$root available in the template too
// // - options gives you access to any other properties set on "data-bind: { template: options }"
// // - templateDocument is the document object of the template
// //
// // Return value: an array of DOM nodes
// }
//
// [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:
//
// function (script) {
// // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result"
// // For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'
// }
//
// This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.
// If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)
// and then you don't need to override 'createJavaScriptEvaluatorBlock'.
ko.templateEngine = function () { };
ko.templateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {
throw new Error("Override renderTemplateSource");
};
ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function (script) {
throw new Error("Override createJavaScriptEvaluatorBlock");
};
ko.templateEngine.prototype['makeTemplateSource'] = function(template, templateDocument) {
// Named template
if (typeof template == "string") {
templateDocument = templateDocument || document;
var elem = templateDocument.getElementById(template);
if (!elem)
throw new Error("Cannot find template with ID " + template);
return new ko.templateSources.domElement(elem);
} else if ((template.nodeType == 1) || (template.nodeType == 8)) {
// Anonymous template
return new ko.templateSources.anonymousTemplate(template);
} else
throw new Error("Unknown template type: " + template);
};
ko.templateEngine.prototype['renderTemplate'] = function (template, bindingContext, options, templateDocument) {
var templateSource = this['makeTemplateSource'](template, templateDocument);
return this['renderTemplateSource'](templateSource, bindingContext, options, templateDocument);
};
ko.templateEngine.prototype['isTemplateRewritten'] = function (template, templateDocument) {
// Skip rewriting if requested
if (this['allowTemplateRewriting'] === false)
return true;
return this['makeTemplateSource'](template, templateDocument)['data']("isRewritten");
};
ko.templateEngine.prototype['rewriteTemplate'] = function (template, rewriterCallback, templateDocument) {
var templateSource = this['makeTemplateSource'](template, templateDocument);
var rewritten = rewriterCallback(templateSource['text']());
templateSource['text'](rewritten);
templateSource['data']("isRewritten", true);
};
ko.exportSymbol('templateEngine', ko.templateEngine);
ko.templateRewriting = (function () {
var memoizeDataBindingAttributeSyntaxRegex = /(<([a-z]+\d*)(?:\s+(?!data-bind\s*=\s*)[a-z0-9\-]+(?:=(?:\"[^\"]*\"|\'[^\']*\'|[^>]*))?)*\s+)data-bind\s*=\s*(["'])([\s\S]*?)\3/gi;
var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g;
function validateDataBindValuesForRewriting(keyValueArray) {
var allValidators = ko.expressionRewriting.bindingRewriteValidators;
for (var i = 0; i < keyValueArray.length; i++) {
var key = keyValueArray[i]['key'];
if (allValidators.hasOwnProperty(key)) {
var validator = allValidators[key];
if (typeof validator === "function") {
var possibleErrorMessage = validator(keyValueArray[i]['value']);
if (possibleErrorMessage)
throw new Error(possibleErrorMessage);
} else if (!validator) {
throw new Error("This template engine does not support the '" + key + "' binding within its templates");
}
}
}
}
function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, nodeName, templateEngine) {
var dataBindKeyValueArray = ko.expressionRewriting.parseObjectLiteral(dataBindAttributeValue);
validateDataBindValuesForRewriting(dataBindKeyValueArray);
var rewrittenDataBindAttributeValue = ko.expressionRewriting.preProcessBindings(dataBindKeyValueArray, {'valueAccessors':true});
// For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional
// anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this
// extra indirection.
var applyBindingsToNextSiblingScript =
"ko.__tr_ambtns(function($context,$element){return(function(){return{ " + rewrittenDataBindAttributeValue + " } })()},'" + nodeName.toLowerCase() + "')";
return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;
}
return {
ensureTemplateIsRewritten: function (template, templateEngine, templateDocument) {
if (!templateEngine['isTemplateRewritten'](template, templateDocument))
templateEngine['rewriteTemplate'](template, function (htmlString) {
return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);
}, templateDocument);
},
memoizeBindingAttributeSyntax: function (htmlString, templateEngine) {
return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function () {
return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[4], /* tagToRetain: */ arguments[1], /* nodeName: */ arguments[2], templateEngine);
}).replace(memoizeVirtualContainerBindingSyntaxRegex, function() {
return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", /* nodeName: */ "#comment", templateEngine);
});
},
applyMemoizedBindingsToNextSibling: function (bindings, nodeName) {
return ko.memoization.memoize(function (domNode, bindingContext) {
var nodeToBind = domNode.nextSibling;
if (nodeToBind && nodeToBind.nodeName.toLowerCase() === nodeName) {
ko.applyBindingAccessorsToNode(nodeToBind, bindings, bindingContext);
}
});
}
}
})();
// Exported only because it has to be referenced by string lookup from within rewritten template
ko.exportSymbol('__tr_ambtns', ko.templateRewriting.applyMemoizedBindingsToNextSibling);
(function() {
// A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving
// logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)
//
// Two are provided by default:
// 1. ko.templateSources.domElement - reads/writes the text content of an arbitrary DOM element
// 2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but
// without reading/writing the actual element text content, since it will be overwritten
// with the rendered template output.
// You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.
// Template sources need to have the following functions:
// text() - returns the template text from your storage location
// text(value) - writes the supplied template text to your storage location
// data(key) - reads values stored using data(key, value) - see below
// data(key, value) - associates "value" with this template and the key "key". Is used to store information like "isRewritten".
//
// Optionally, template sources can also have the following functions:
// nodes() - returns a DOM element containing the nodes of this template, where available
// nodes(value) - writes the given DOM element to your storage location
// If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text()
// for improved speed. However, all templateSources must supply text() even if they don't supply nodes().
//
// Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were
// using and overriding "makeTemplateSource" to return an instance of your custom template source.
ko.templateSources = {};
// ---- ko.templateSources.domElement -----
ko.templateSources.domElement = function(element) {
this.domElement = element;
}
ko.templateSources.domElement.prototype['text'] = function(/* valueToWrite */) {
var tagNameLower = ko.utils.tagNameLower(this.domElement),
elemContentsProperty = tagNameLower === "script" ? "text"
: tagNameLower === "textarea" ? "value"
: "innerHTML";
if (arguments.length == 0) {
return this.domElement[elemContentsProperty];
} else {
var valueToWrite = arguments[0];
if (elemContentsProperty === "innerHTML")
ko.utils.setHtml(this.domElement, valueToWrite);
else
this.domElement[elemContentsProperty] = valueToWrite;
}
};
var dataDomDataPrefix = ko.utils.domData.nextKey() + "_";
ko.templateSources.domElement.prototype['data'] = function(key /*, valueToWrite */) {
if (arguments.length === 1) {
return ko.utils.domData.get(this.domElement, dataDomDataPrefix + key);
} else {
ko.utils.domData.set(this.domElement, dataDomDataPrefix + key, arguments[1]);
}
};
// ---- ko.templateSources.anonymousTemplate -----
// Anonymous templates are normally saved/retrieved as DOM nodes through "nodes".
// For compatibility, you can also read "text"; it will be serialized from the nodes on demand.
// Writing to "text" is still supported, but then the template data will not be available as DOM nodes.
var anonymousTemplatesDomDataKey = ko.utils.domData.nextKey();
ko.templateSources.anonymousTemplate = function(element) {
this.domElement = element;
}
ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();
ko.templateSources.anonymousTemplate.prototype.constructor = ko.templateSources.anonymousTemplate;
ko.templateSources.anonymousTemplate.prototype['text'] = function(/* valueToWrite */) {
if (arguments.length == 0) {
var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
if (templateData.textData === undefined && templateData.containerData)
templateData.textData = templateData.containerData.innerHTML;
return templateData.textData;
} else {
var valueToWrite = arguments[0];
ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, {textData: valueToWrite});
}
};
ko.templateSources.domElement.prototype['nodes'] = function(/* valueToWrite */) {
if (arguments.length == 0) {
var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
return templateData.containerData;
} else {
var valueToWrite = arguments[0];
ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, {containerData: valueToWrite});
}
};
ko.exportSymbol('templateSources', ko.templateSources);
ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement);
ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);
})();
(function () {
var _templateEngine;
ko.setTemplateEngine = function (templateEngine) {
if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))
throw new Error("templateEngine must inherit from ko.templateEngine");
_templateEngine = templateEngine;
}
function invokeForEachNodeInContinuousRange(firstNode, lastNode, action) {
var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);
while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {
nextInQueue = ko.virtualElements.nextSibling(node);
action(node, nextInQueue);
}
}
function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) {
// To be used on any nodes that have been rendered by a template and have been inserted into some parent element
// Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because
// the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense,
// (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings
// (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)
if (continuousNodeArray.length) {
var firstNode = continuousNodeArray[0],
lastNode = continuousNodeArray[continuousNodeArray.length - 1],
parentNode = firstNode.parentNode,
provider = ko.bindingProvider['instance'],
preprocessNode = provider['preprocessNode'];
if (preprocessNode) {
invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node, nextNodeInRange) {
var nodePreviousSibling = node.previousSibling;
var newNodes = preprocessNode.call(provider, node);
if (newNodes) {
if (node === firstNode)
firstNode = newNodes[0] || nextNodeInRange;
if (node === lastNode)
lastNode = newNodes[newNodes.length - 1] || nodePreviousSibling;
}
});
// Because preprocessNode can change the nodes, including the first and last nodes, update continuousNodeArray to match.
// We need the full set, including inner nodes, because the unmemoize step might remove the first node (and so the real
// first node needs to be in the array).
continuousNodeArray.length = 0;
if (!firstNode) { // preprocessNode might have removed all the nodes, in which case there's nothing left to do
return;
}
if (firstNode === lastNode) {
continuousNodeArray.push(firstNode);
} else {
continuousNodeArray.push(firstNode, lastNode);
ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);
}
}
// Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)
// whereas a regular applyBindings won't introduce new memoized nodes
invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) {
if (node.nodeType === 1 || node.nodeType === 8)
ko.applyBindings(bindingContext, node);
});
invokeForEachNodeInContinuousRange(firstNode, lastNode, function(node) {
if (node.nodeType === 1 || node.nodeType === 8)
ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);
});
// Make sure any changes done by applyBindings or unmemoize are reflected in the array
ko.utils.fixUpContinuousNodeArray(continuousNodeArray, parentNode);
}
}
function getFirstNodeFromPossibleArray(nodeOrNodeArray) {
return nodeOrNodeArray.nodeType ? nodeOrNodeArray
: nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]
: null;
}
function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {
options = options || {};
var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
var templateDocument = (firstTargetNode || template || {}).ownerDocument;
var templateEngineToUse = (options['templateEngine'] || _templateEngine);
ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument);
var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument);
// Loosely check result is an array of DOM nodes
if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
throw new Error("Template engine must return an array of DOM nodes");
var haveAddedNodesToParent = false;
switch (renderMode) {
case "replaceChildren":
ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);
haveAddedNodesToParent = true;
break;
case "replaceNode":
ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);
haveAddedNodesToParent = true;
break;
case "ignoreTargetNode": break;
default:
throw new Error("Unknown renderMode: " + renderMode);
}
if (haveAddedNodesToParent) {
activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext);
if (options['afterRender'])
ko.dependencyDetection.ignore(options['afterRender'], null, [renderedNodesArray, bindingContext['$data']]);
}
return renderedNodesArray;
}
function resolveTemplateName(template, data, context) {
// The template can be specified as:
if (ko.isObservable(template)) {
// 1. An observable, with string value
return template();
} else if (typeof template === 'function') {
// 2. A function of (data, context) returning a string
return template(data, context);
} else {
// 3. A string
return template;
}
}
ko.renderTemplate = function (template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {
options = options || {};
if ((options['templateEngine'] || _templateEngine) == undefined)
throw new Error("Set a template engine before calling renderTemplate");
renderMode = renderMode || "replaceChildren";
if (targetNodeOrNodeArray) {
var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
var whenToDispose = function () { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)
var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode;
return ko.dependentObservable( // So the DOM is automatically updated when any dependency changes
function () {
// Ensure we've got a proper binding context to work with
var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))
? dataOrBindingContext
: new ko.bindingContext(ko.utils.unwrapObservable(dataOrBindingContext));
var templateName = resolveTemplateName(template, bindingContext['$data'], bindingContext),
renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
if (renderMode == "replaceNode") {
targetNodeOrNodeArray = renderedNodesArray;
firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
}
},
null,
{ disposeWhen: whenToDispose, disposeWhenNodeIsRemoved: activelyDisposeWhenNodeIsRemoved }
);
} else {
// We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node
return ko.memoization.memoize(function (domNode) {
ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");
});
}
};
ko.renderTemplateForEach = function (template, arrayOrObservableArray, options, targetNode, parentBindingContext) {
// Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then
// activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.
var arrayItemContext;
// This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode
var executeTemplateForArrayItem = function (arrayValue, index) {
// Support selecting template as a function of the data being rendered
arrayItemContext = parentBindingContext['createChildContext'](arrayValue, options['as'], function(context) {
context['$index'] = index;
});
var templateName = resolveTemplateName(template, arrayValue, arrayItemContext);
return executeTemplate(null, "ignoreTargetNode", templateName, arrayItemContext, options);
}
// This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode
var activateBindingsCallback = function(arrayValue, addedNodesArray, index) {
activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext);
if (options['afterRender'])
options['afterRender'](addedNodesArray, arrayValue);
// release the "cache" variable, so that it can be collected by
// the GC when its value isn't used from within the bindings anymore.
arrayItemContext = null;
};
return ko.dependentObservable(function () {
var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];
if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
unwrappedArray = [unwrappedArray];
// Filter out any entries marked as destroyed
var filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
return options['includeDestroyed'] || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
});
// Call setDomNodeChildrenFromArrayMapping, ignoring any observables unwrapped within (most likely from a callback function).
// If the array items are observables, though, they will be unwrapped in executeTemplateForArrayItem and managed within setDomNodeChildrenFromArrayMapping.
ko.dependencyDetection.ignore(ko.utils.setDomNodeChildrenFromArrayMapping, null, [targetNode, filteredArray, executeTemplateForArrayItem, options, activateBindingsCallback]);
}, null, { disposeWhenNodeIsRemoved: targetNode });
};
var templateComputedDomDataKey = ko.utils.domData.nextKey();
function disposeOldComputedAndStoreNewOne(element, newComputed) {
var oldComputed = ko.utils.domData.get(element, templateComputedDomDataKey);
if (oldComputed && (typeof(oldComputed.dispose) == 'function'))
oldComputed.dispose();
ko.utils.domData.set(element, templateComputedDomDataKey, (newComputed && newComputed.isActive()) ? newComputed : undefined);
}
ko.bindingHandlers['template'] = {
'init': function(element, valueAccessor) {
// Support anonymous templates
var bindingValue = ko.utils.unwrapObservable(valueAccessor());
if (typeof bindingValue == "string" || bindingValue['name']) {
// It's a named template - clear the element
ko.virtualElements.emptyNode(element);
} else if ('nodes' in bindingValue) {
// We've been given an array of DOM nodes. Save them as the template source.
// There is no known use case for the node array being an observable array (if the output
// varies, put that behavior *into* your template - that's what templates are for), and
// the implementation would be a mess, so assert that it's not observable.
var nodes = bindingValue['nodes'] || [];
if (ko.isObservable(nodes)) {
throw new Error('The "nodes" option must be a plain, non-observable array.');
}
var container = ko.utils.moveCleanedNodesToContainerElement(nodes); // This also removes the nodes from their current parent
new ko.templateSources.anonymousTemplate(element)['nodes'](container);
} else {
// It's an anonymous template - store the element contents, then clear the element
var templateNodes = ko.virtualElements.childNodes(element),
container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent
new ko.templateSources.anonymousTemplate(element)['nodes'](container);
}
return { 'controlsDescendantBindings': true };
},
'update': function (element, valueAccessor, allBindings, viewModel, bindingContext) {
var value = valueAccessor(),
dataValue,
options = ko.utils.unwrapObservable(value),
shouldDisplay = true,
templateComputed = null,
templateName;
if (typeof options == "string") {
templateName = value;
options = {};
} else {
templateName = options['name'];
// Support "if"/"ifnot" conditions
if ('if' in options)
shouldDisplay = ko.utils.unwrapObservable(options['if']);
if (shouldDisplay && 'ifnot' in options)
shouldDisplay = !ko.utils.unwrapObservable(options['ifnot']);
dataValue = ko.utils.unwrapObservable(options['data']);
}
if ('foreach' in options) {
// Render once for each data point (treating data set as empty if shouldDisplay==false)
var dataArray = (shouldDisplay && options['foreach']) || [];
templateComputed = ko.renderTemplateForEach(templateName || element, dataArray, options, element, bindingContext);
} else if (!shouldDisplay) {
ko.virtualElements.emptyNode(element);
} else {
// Render once for this single data point (or use the viewModel if no data was provided)
var innerBindingContext = ('data' in options) ?
bindingContext['createChildContext'](dataValue, options['as']) : // Given an explitit 'data' value, we create a child binding context for it
bindingContext; // Given no explicit 'data' value, we retain the same binding context
templateComputed = ko.renderTemplate(templateName || element, innerBindingContext, options, element);
}
// It only makes sense to have a single template computed per element (otherwise which one should have its output displayed?)
disposeOldComputedAndStoreNewOne(element, templateComputed);
}
};
// Anonymous templates can't be rewritten. Give a nice error message if you try to do it.
ko.expressionRewriting.bindingRewriteValidators['template'] = function(bindingValue) {
var parsedBindingValue = ko.expressionRewriting.parseObjectLiteral(bindingValue);
if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])
return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)
if (ko.expressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name"))
return null; // Named templates can be rewritten, so return "no error"
return "This template engine does not support anonymous templates nested within its templates";
};
ko.virtualElements.allowedBindings['template'] = true;
})();
ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine);
ko.exportSymbol('renderTemplate', ko.renderTemplate);
// Go through the items that have been added and deleted and try to find matches between them.
ko.utils.findMovesInArrayComparison = function (left, right, limitFailedCompares) {
if (left.length && right.length) {
var failedCompares, l, r, leftItem, rightItem;
for (failedCompares = l = 0; (!limitFailedCompares || failedCompares < limitFailedCompares) && (leftItem = left[l]); ++l) {
for (r = 0; rightItem = right[r]; ++r) {
if (leftItem['value'] === rightItem['value']) {
leftItem['moved'] = rightItem['index'];
rightItem['moved'] = leftItem['index'];
right.splice(r, 1); // This item is marked as moved; so remove it from right list
failedCompares = r = 0; // Reset failed compares count because we're checking for consecutive failures
break;
}
}
failedCompares += r;
}
}
};
ko.utils.compareArrays = (function () {
var statusNotInOld = 'added', statusNotInNew = 'deleted';
// Simple calculation based on Levenshtein distance.
function compareArrays(oldArray, newArray, options) {
// For backward compatibility, if the third arg is actually a bool, interpret
// it as the old parameter 'dontLimitMoves'. Newer code should use { dontLimitMoves: true }.
options = (typeof options === 'boolean') ? { 'dontLimitMoves': options } : (options || {});
oldArray = oldArray || [];
newArray = newArray || [];
if (oldArray.length <= newArray.length)
return compareSmallArrayToBigArray(oldArray, newArray, statusNotInOld, statusNotInNew, options);
else
return compareSmallArrayToBigArray(newArray, oldArray, statusNotInNew, statusNotInOld, options);
}
function compareSmallArrayToBigArray(smlArray, bigArray, statusNotInSml, statusNotInBig, options) {
var myMin = Math.min,
myMax = Math.max,
editDistanceMatrix = [],
smlIndex, smlIndexMax = smlArray.length,
bigIndex, bigIndexMax = bigArray.length,
compareRange = (bigIndexMax - smlIndexMax) || 1,
maxDistance = smlIndexMax + bigIndexMax + 1,
thisRow, lastRow,
bigIndexMaxForRow, bigIndexMinForRow;
for (smlIndex = 0; smlIndex <= smlIndexMax; smlIndex++) {
lastRow = thisRow;
editDistanceMatrix.push(thisRow = []);
bigIndexMaxForRow = myMin(bigIndexMax, smlIndex + compareRange);
bigIndexMinForRow = myMax(0, smlIndex - 1);
for (bigIndex = bigIndexMinForRow; bigIndex <= bigIndexMaxForRow; bigIndex++) {
if (!bigIndex)
thisRow[bigIndex] = smlIndex + 1;
else if (!smlIndex) // Top row - transform empty array into new array via additions
thisRow[bigIndex] = bigIndex + 1;
else if (smlArray[smlIndex - 1] === bigArray[bigIndex - 1])
thisRow[bigIndex] = lastRow[bigIndex - 1]; // copy value (no edit)
else {
var northDistance = lastRow[bigIndex] || maxDistance; // not in big (deletion)
var westDistance = thisRow[bigIndex - 1] || maxDistance; // not in small (addition)
thisRow[bigIndex] = myMin(northDistance, westDistance) + 1;
}
}
}
var editScript = [], meMinusOne, notInSml = [], notInBig = [];
for (smlIndex = smlIndexMax, bigIndex = bigIndexMax; smlIndex || bigIndex;) {
meMinusOne = editDistanceMatrix[smlIndex][bigIndex] - 1;
if (bigIndex && meMinusOne === editDistanceMatrix[smlIndex][bigIndex-1]) {
notInSml.push(editScript[editScript.length] = { // added
'status': statusNotInSml,
'value': bigArray[--bigIndex],
'index': bigIndex });
} else if (smlIndex && meMinusOne === editDistanceMatrix[smlIndex - 1][bigIndex]) {
notInBig.push(editScript[editScript.length] = { // deleted
'status': statusNotInBig,
'value': smlArray[--smlIndex],
'index': smlIndex });
} else {
--bigIndex;
--smlIndex;
if (!options['sparse']) {
editScript.push({
'status': "retained",
'value': bigArray[bigIndex] });
}
}
}
// Set a limit on the number of consecutive non-matching comparisons; having it a multiple of
// smlIndexMax keeps the time complexity of this algorithm linear.
ko.utils.findMovesInArrayComparison(notInSml, notInBig, smlIndexMax * 10);
return editScript.reverse();
}
return compareArrays;
})();
ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays);
(function () {
// Objective:
// * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,
// map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node
// * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node
// so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we
// previously mapped - retain those nodes, and just insert/delete other ones
// "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node
// You can use this, for example, to activate bindings on those nodes.
function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) {
// Map this array value inside a dependentObservable so we re-map when any dependency changes
var mappedNodes = [];
var dependentObservable = ko.dependentObservable(function() {
var newMappedNodes = mapping(valueToMap, index, ko.utils.fixUpContinuousNodeArray(mappedNodes, containerNode)) || [];
// On subsequent evaluations, just replace the previously-inserted DOM nodes
if (mappedNodes.length > 0) {
ko.utils.replaceDomNodes(mappedNodes, newMappedNodes);
if (callbackAfterAddingNodes)
ko.dependencyDetection.ignore(callbackAfterAddingNodes, null, [valueToMap, newMappedNodes, index]);
}
// Replace the contents of the mappedNodes array, thereby updating the record
// of which nodes would be deleted if valueToMap was itself later removed
mappedNodes.length = 0;
ko.utils.arrayPushAll(mappedNodes, newMappedNodes);
}, null, { disposeWhenNodeIsRemoved: containerNode, disposeWhen: function() { return !ko.utils.anyDomNodeIsAttachedToDocument(mappedNodes); } });
return { mappedNodes : mappedNodes, dependentObservable : (dependentObservable.isActive() ? dependentObservable : undefined) };
}
var lastMappingResultDomDataKey = ko.utils.domData.nextKey();
ko.utils.setDomNodeChildrenFromArrayMapping = function (domNode, array, mapping, options, callbackAfterAddingNodes) {
// Compare the provided array against the previous one
array = array || [];
options = options || {};
var isFirstExecution = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) === undefined;
var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) || [];
var lastArray = ko.utils.arrayMap(lastMappingResult, function (x) { return x.arrayEntry; });
var editScript = ko.utils.compareArrays(lastArray, array, options['dontLimitMoves']);
// Build the new mapping result
var newMappingResult = [];
var lastMappingResultIndex = 0;
var newMappingResultIndex = 0;
var nodesToDelete = [];
var itemsToProcess = [];
var itemsForBeforeRemoveCallbacks = [];
var itemsForMoveCallbacks = [];
var itemsForAfterAddCallbacks = [];
var mapData;
function itemMovedOrRetained(editScriptIndex, oldPosition) {
mapData = lastMappingResult[oldPosition];
if (newMappingResultIndex !== oldPosition)
itemsForMoveCallbacks[editScriptIndex] = mapData;
// Since updating the index might change the nodes, do so before calling fixUpContinuousNodeArray
mapData.indexObservable(newMappingResultIndex++);
ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode);
newMappingResult.push(mapData);
itemsToProcess.push(mapData);
}
function callCallback(callback, items) {
if (callback) {
for (var i = 0, n = items.length; i < n; i++) {
if (items[i]) {
ko.utils.arrayForEach(items[i].mappedNodes, function(node) {
callback(node, i, items[i].arrayEntry);
});
}
}
}
}
for (var i = 0, editScriptItem, movedIndex; editScriptItem = editScript[i]; i++) {
movedIndex = editScriptItem['moved'];
switch (editScriptItem['status']) {
case "deleted":
if (movedIndex === undefined) {
mapData = lastMappingResult[lastMappingResultIndex];
// Stop tracking changes to the mapping for these nodes
if (mapData.dependentObservable)
mapData.dependentObservable.dispose();
// Queue these nodes for later removal
nodesToDelete.push.apply(nodesToDelete, ko.utils.fixUpContinuousNodeArray(mapData.mappedNodes, domNode));
if (options['beforeRemove']) {
itemsForBeforeRemoveCallbacks[i] = mapData;
itemsToProcess.push(mapData);
}
}
lastMappingResultIndex++;
break;
case "retained":
itemMovedOrRetained(i, lastMappingResultIndex++);
break;
case "added":
if (movedIndex !== undefined) {
itemMovedOrRetained(i, movedIndex);
} else {
mapData = { arrayEntry: editScriptItem['value'], indexObservable: ko.observable(newMappingResultIndex++) };
newMappingResult.push(mapData);
itemsToProcess.push(mapData);
if (!isFirstExecution)
itemsForAfterAddCallbacks[i] = mapData;
}
break;
}
}
// Call beforeMove first before any changes have been made to the DOM
callCallback(options['beforeMove'], itemsForMoveCallbacks);
// Next remove nodes for deleted items (or just clean if there's a beforeRemove callback)
ko.utils.arrayForEach(nodesToDelete, options['beforeRemove'] ? ko.cleanNode : ko.removeNode);
// Next add/reorder the remaining items (will include deleted items if there's a beforeRemove callback)
for (var i = 0, nextNode = ko.virtualElements.firstChild(domNode), lastNode, node; mapData = itemsToProcess[i]; i++) {
// Get nodes for newly added items
if (!mapData.mappedNodes)
ko.utils.extend(mapData, mapNodeAndRefreshWhenChanged(domNode, mapping, mapData.arrayEntry, callbackAfterAddingNodes, mapData.indexObservable));
// Put nodes in the right place if they aren't there already
for (var j = 0; node = mapData.mappedNodes[j]; nextNode = node.nextSibling, lastNode = node, j++) {
if (node !== nextNode)
ko.virtualElements.insertAfter(domNode, node, lastNode);
}
// Run the callbacks for newly added nodes (for example, to apply bindings, etc.)
if (!mapData.initialized && callbackAfterAddingNodes) {
callbackAfterAddingNodes(mapData.arrayEntry, mapData.mappedNodes, mapData.indexObservable);
mapData.initialized = true;
}
}
// If there's a beforeRemove callback, call it after reordering.
// Note that we assume that the beforeRemove callback will usually be used to remove the nodes using
// some sort of animation, which is why we first reorder the nodes that will be removed. If the
// callback instead removes the nodes right away, it would be more efficient to skip reordering them.
// Perhaps we'll make that change in the future if this scenario becomes more common.
callCallback(options['beforeRemove'], itemsForBeforeRemoveCallbacks);
// Finally call afterMove and afterAdd callbacks
callCallback(options['afterMove'], itemsForMoveCallbacks);
callCallback(options['afterAdd'], itemsForAfterAddCallbacks);
// Store a copy of the array items we just considered so we can difference it next time
ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);
}
})();
ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);
ko.nativeTemplateEngine = function () {
this['allowTemplateRewriting'] = false;
}
ko.nativeTemplateEngine.prototype = new ko.templateEngine();
ko.nativeTemplateEngine.prototype.constructor = ko.nativeTemplateEngine;
ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function (templateSource, bindingContext, options, templateDocument) {
var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly
templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null,
templateNodes = templateNodesFunc ? templateSource['nodes']() : null;
if (templateNodes) {
return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes);
} else {
var templateText = templateSource['text']();
return ko.utils.parseHtmlFragment(templateText, templateDocument);
}
};
ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();
ko.setTemplateEngine(ko.nativeTemplateEngine.instance);
ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine);
(function() {
ko.jqueryTmplTemplateEngine = function () {
// Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl
// doesn't expose a version number, so we have to infer it.
// Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,
// which KO internally refers to as version "2", so older versions are no longer detected.
var jQueryTmplVersion = this.jQueryTmplVersion = (function() {
if (!jQueryInstance || !(jQueryInstance['tmpl']))
return 0;
// Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.
try {
if (jQueryInstance['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {
// Since 1.0.0pre, custom tags should append markup to an array called "__"
return 2; // Final version of jquery.tmpl
}
} catch(ex) { /* Apparently not the version we were looking for */ }
return 1; // Any older version that we don't support
})();
function ensureHasReferencedJQueryTemplates() {
if (jQueryTmplVersion < 2)
throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.");
}
function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {
return jQueryInstance['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
}
this['renderTemplateSource'] = function(templateSource, bindingContext, options, templateDocument) {
templateDocument = templateDocument || document;
options = options || {};
ensureHasReferencedJQueryTemplates();
// Ensure we have stored a precompiled version of this template (don't want to reparse on every render)
var precompiled = templateSource['data']('precompiled');
if (!precompiled) {
var templateText = templateSource['text']() || "";
// Wrap in "with($whatever.koBindingContext) { ... }"
templateText = "{{ko_with $item.koBindingContext}}" + templateText + "{{/ko_with}}";
precompiled = jQueryInstance['template'](null, templateText);
templateSource['data']('precompiled', precompiled);
}
var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays
var jQueryTemplateOptions = jQueryInstance['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);
var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
resultNodes['appendTo'](templateDocument.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work
jQueryInstance['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders
return resultNodes;
};
this['createJavaScriptEvaluatorBlock'] = function(script) {
return "{{ko_code ((function() { return " + script + " })()) }}";
};
this['addTemplate'] = function(templateName, templateMarkup) {
document.write("<script type='text/html' id='" + templateName + "'>" + templateMarkup + "<" + "/script>");
};
if (jQueryTmplVersion > 0) {
jQueryInstance['tmpl']['tag']['ko_code'] = {
open: "__.push($1 || '');"
};
jQueryInstance['tmpl']['tag']['ko_with'] = {
open: "with($1) {",
close: "} "
};
}
};
ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine();
ko.jqueryTmplTemplateEngine.prototype.constructor = ko.jqueryTmplTemplateEngine;
// Use this one by default *only if jquery.tmpl is referenced*
var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine();
if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0)
ko.setTemplateEngine(jqueryTmplTemplateEngineInstance);
ko.exportSymbol('jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine);
})();
}));
}());
})();