',
- 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/knockout/knockout/pull/440
- // [B] Any trailing nodes that have been remove should be ignored
- // This prevents the code here from adding unrelated nodes to the array while processing rule [C]
- // See https://github.com/knockout/knockout/pull/1903
- // [C] 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]
- while (continuousNodeArray.length > 1 && continuousNodeArray[continuousNodeArray.length - 1].parentNode !== parentNode)
- continuousNodeArray.length--;
-
- // Rule [C]
- 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;
- }
- 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();
- },
-
- catchFunctionErrors: function (delegate) {
- return ko['onError'] ? function () {
- try {
- return delegate.apply(this, arguments);
- } catch (e) {
- ko['onError'] && ko['onError'](e);
- throw e;
- }
- } : delegate;
- },
-
- setTimeout: function (handler, timeout) {
- return setTimeout(ko.utils.catchFunctionErrors(handler), timeout);
- },
-
- deferError: function (error) {
- setTimeout(function () {
- ko['onError'] && ko['onError'](error);
- throw error;
- }, 0);
- },
-
- registerEventHandler: function (element, eventType, handler) {
- var wrappedHandler = ko.utils.catchFunctionErrors(handler);
-
- var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType];
- if (!ko.options['useOnlyNativeEvents'] && !mustUseAttachEvent && jQueryInstance) {
- jQueryInstance(element)['bind'](eventType, wrappedHandler);
- } else if (!mustUseAttachEvent && typeof element.addEventListener == "function")
- element.addEventListener(eventType, wrappedHandler, false);
- else if (typeof element.attachEvent != "undefined") {
- var attachEventHandler = function (event) { wrappedHandler.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 (!ko.options['useOnlyNativeEvents'] && 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(""), 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;
- },
-
- createSymbolOrString: function(identifier) {
- return canUseSymbols ? Symbol(identifier) : identifier;
- },
-
- 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 none = [0, "", ""],
- table = [1, "
", "
"],
- tbody = [2, "
", "
"],
- tr = [3, "
", "
"],
- select = [1, ""],
- lookup = {
- 'thead': table,
- 'tbody': table,
- 'tfoot': table,
- 'tr': tbody,
- 'td': tr,
- 'th': tr,
- 'option': select,
- 'optgroup': select
- },
-
- // This is needed for old IE if you're *not* using either jQuery or innerShiv. Doesn't affect other cases.
- mayRequireCreateElementHack = ko.utils.ieVersion <= 8;
-
- function getWrap(tags) {
- var m = tags.match(/^<([a-z]+)[ >]/);
- return (m && lookup[m[1]]) || none;
- }
-
- 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: "
abc
" will get parsed as "
abc
"
- // 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"),
- wrap = getWrap(tags),
- depth = wrap[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
" + wrap[1] + html + wrap[2] + "
";
- if (typeof windowContext['innerShiv'] == "function") {
- // Note that innerShiv is deprecated in favour of html5shiv. We should consider adding
- // support for html5shiv (except if no explicit support is needed, e.g., if html5shiv
- // somehow shims the native APIs so it just works anyway)
- div.appendChild(windowContext['innerShiv'](markup));
- } else {
- if (mayRequireCreateElementHack) {
- // The document.createElement('my-element') trick to enable custom elements in IE6-8
- // only works if we assign innerHTML on an element associated with that document.
- documentContext.appendChild(div);
- }
-
- div.innerHTML = markup;
-
- if (mayRequireCreateElementHack) {
- div.parentNode.removeChild(div);
- }
- }
-
- // Move to the right depth
- while (depth--)
- 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
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 "";
- },
-
- 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.tasks = (function () {
- var scheduler,
- taskQueue = [],
- taskQueueLength = 0,
- nextHandle = 1,
- nextIndexToProcess = 0;
-
- if (window['MutationObserver']) {
- // Chrome 27+, Firefox 14+, IE 11+, Opera 15+, Safari 6.1+
- // From https://github.com/petkaantonov/bluebird * Copyright (c) 2014 Petka Antonov * License: MIT
- scheduler = (function (callback) {
- var div = document.createElement("div");
- new MutationObserver(callback).observe(div, {attributes: true});
- return function () { div.classList.toggle("foo"); };
- })(scheduledProcess);
- } else if (document && "onreadystatechange" in document.createElement("script")) {
- // IE 6-10
- // From https://github.com/YuzuJS/setImmediate * Copyright (c) 2012 Barnesandnoble.com, llc, Donavon West, and Domenic Denicola * License: MIT
- scheduler = function (callback) {
- var script = document.createElement("script");
- script.onreadystatechange = function () {
- script.onreadystatechange = null;
- document.documentElement.removeChild(script);
- script = null;
- callback();
- };
- document.documentElement.appendChild(script);
- };
- } else {
- scheduler = function (callback) {
- setTimeout(callback, 0);
- };
- }
-
- function processTasks() {
- if (taskQueueLength) {
- // Each mark represents the end of a logical group of tasks and the number of these groups is
- // limited to prevent unchecked recursion.
- var mark = taskQueueLength, countMarks = 0;
-
- // nextIndexToProcess keeps track of where we are in the queue; processTasks can be called recursively without issue
- for (var task; nextIndexToProcess < taskQueueLength; ) {
- if (task = taskQueue[nextIndexToProcess++]) {
- if (nextIndexToProcess > mark) {
- if (++countMarks >= 5000) {
- nextIndexToProcess = taskQueueLength; // skip all tasks remaining in the queue since any of them could be causing the recursion
- ko.utils.deferError(Error("'Too much recursion' after processing " + countMarks + " task groups."));
- break;
- }
- mark = taskQueueLength;
- }
- try {
- task();
- } catch (ex) {
- ko.utils.deferError(ex);
- }
- }
- }
- }
- }
-
- function scheduledProcess() {
- processTasks();
-
- // Reset the queue
- nextIndexToProcess = taskQueueLength = taskQueue.length = 0;
- }
-
- function scheduleTaskProcessing() {
- ko.tasks['scheduler'](scheduledProcess);
- }
-
- var tasks = {
- 'scheduler': scheduler, // Allow overriding the scheduler
-
- schedule: function (func) {
- if (!taskQueueLength) {
- scheduleTaskProcessing();
- }
-
- taskQueue[taskQueueLength++] = func;
- return nextHandle++;
- },
-
- cancel: function (handle) {
- var index = handle - (nextHandle - taskQueueLength);
- if (index >= nextIndexToProcess && index < taskQueueLength) {
- taskQueue[index] = null;
- }
- },
-
- // For testing only: reset the queue and return the previous queue length
- 'resetForTesting': function () {
- var length = taskQueueLength - nextIndexToProcess;
- nextIndexToProcess = taskQueueLength = taskQueue.length = 0;
- return length;
- },
-
- runEarly: processTasks
- };
-
- return tasks;
-})();
-
-ko.exportSymbol('tasks', ko.tasks);
-ko.exportSymbol('tasks.schedule', ko.tasks.schedule);
-//ko.exportSymbol('tasks.cancel', ko.tasks.cancel); "cancel" isn't minified
-ko.exportSymbol('tasks.runEarly', ko.tasks.runEarly);
-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 = ko.utils.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'];
- }
-
- // rateLimit supersedes deferred updates
- target._deferUpdates = false;
-
- limitFunction = method == 'notifyWhenChangesStop' ? debounce : throttle;
- target.limit(function(callback) {
- return limitFunction(callback, timeout);
- });
- },
-
- 'deferred': function(target, options) {
- if (options !== true) {
- throw new Error('The \'deferred\' extender only accepts the value \'true\', because it is not supported to turn deferral off once enabled.')
- }
-
- if (!target._deferUpdates) {
- target._deferUpdates = true;
- target.limit(function (callback) {
- var handle;
- return function () {
- ko.tasks.cancel(handle);
- handle = ko.tasks.schedule(callback);
- target['notifySubscribers'](undefined, 'dirty');
- };
- });
- }
- },
-
- '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 = ko.utils.setTimeout(function () {
- timeoutInstance = undefined;
- callback();
- }, timeout);
- }
- };
-}
-
-function debounce(callback, timeout) {
- var timeoutInstance;
- return function () {
- clearTimeout(timeoutInstance);
- timeoutInstance = ko.utils.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);
- ko_subscribable_fn.init(this);
-}
-
-var defaultEvent = "change";
-
-// Moved out of "limit" to avoid the extra closure
-function limitNotifySubscribers(value, event) {
- if (!event || event === defaultEvent) {
- this._limitChange(value);
- } else if (event === 'beforeChange') {
- this._limitBeforeChange(value);
- } else {
- this._origNotifySubscribers(value, event);
- }
-}
-
-var ko_subscribable_fn = {
- init: function(instance) {
- instance._subscriptions = {};
- instance._versionNumber = 1;
- },
-
- 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),
- ignoreBeforeChange, previousValue, pendingValue, beforeChange = 'beforeChange';
-
- if (!self._origNotifySubscribers) {
- self._origNotifySubscribers = self["notifySubscribers"];
- self["notifySubscribers"] = limitNotifySubscribers;
- }
-
- var finish = limitFunction(function() {
- self._notificationIsPending = false;
-
- // 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();
- }
- ignoreBeforeChange = false;
- if (self.isDifferent(previousValue, pendingValue)) {
- self._origNotifySubscribers(previousValue = pendingValue);
- }
- });
-
- self._limitChange = function(value) {
- self._notificationIsPending = ignoreBeforeChange = true;
- pendingValue = value;
- finish();
- };
- self._limitBeforeChange = function(value) {
- if (!ignoreBeforeChange) {
- 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) {
- if (eventName !== 'dirty')
- 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.call(currentFrame.callbackTarget, 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('ignoreDependencies', ko.ignoreDependencies = ko.dependencyDetection.ignore);
-var observableLatestValue = ko.utils.createSymbolOrString('_latestValue');
-
-ko.observable = function (initialValue) {
- function observable() {
- if (arguments.length > 0) {
- // Write
-
- // Ignore writes if the value hasn't changed
- if (observable.isDifferent(observable[observableLatestValue], arguments[0])) {
- observable.valueWillMutate();
- observable[observableLatestValue] = arguments[0];
- 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 observable[observableLatestValue];
- }
- }
-
- observable[observableLatestValue] = initialValue;
-
- // Inherit from 'subscribable'
- if (!ko.utils.canSetPrototype) {
- // 'subscribable' won't be on the prototype chain unless we put it there directly
- ko.utils.extend(observable, ko.subscribable['fn']);
- }
- ko.subscribable['fn'].init(observable);
-
- // Inherit from 'observable'
- ko.utils.setPrototypeOfOrExtend(observable, observableFn);
-
- if (ko.options['deferUpdates']) {
- ko.extenders['deferred'](observable, true);
- }
-
- return observable;
-}
-
-// Define prototype for observables
-var observableFn = {
- 'equalityComparer': valuesArePrimitiveAndEqual,
- peek: function() { return this[observableLatestValue]; },
- valueHasMutated: function () { this['notifySubscribers'](this[observableLatestValue]); },
- valueWillMutate: function () { this['notifySubscribers'](this[observableLatestValue], 'beforeChange'); }
-};
-
-// 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(observableFn, ko.subscribable['fn']);
-}
-
-var protoProperty = ko.observable.protoProperty = '__ko_proto__';
-observableFn[protoProperty] = ko.observable;
-
-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.exportSymbol('observable.fn', observableFn);
-ko.exportProperty(observableFn, 'peek', observableFn.peek);
-ko.exportProperty(observableFn, 'valueHasMutated', observableFn.valueHasMutated);
-ko.exportProperty(observableFn, 'valueWillMutate', observableFn.valueWillMutate);
-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();
- }
- }
-};
-
-// 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']);
-}
-
-// 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();
- // The native sort and reverse methods return a reference to the array, but it makes more sense to return the observable array instead.
- return methodCallResult === underlyingArray ? this : 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);
- };
-});
-
-ko.exportSymbol('observableArray', ko.observableArray);
-var arrayChangeEventName = 'arrayChange';
-ko.extenders['trackArrayChanges'] = function(target, options) {
- // Use the provided options--each call to trackArrayChanges overwrites the previously set options
- target.compareArrayOptions = {};
- if (options && typeof options == "object") {
- ko.utils.extend(target.compareArrayOptions, options);
- }
- target.compareArrayOptions['sparse'] = true;
-
- // 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, target.compareArrayOptions);
- }
-
- 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;
- };
-};
-var computedState = ko.utils.createSymbolOrString('_state');
-
-ko.computed = ko.dependentObservable = function (evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
- if (typeof evaluatorFunctionOrOptions === "object") {
- // Single-parameter syntax - everything is on this "options" param
- options = evaluatorFunctionOrOptions;
- } else {
- // Multi-parameter syntax - construct the options according to the params passed
- options = options || {};
- if (evaluatorFunctionOrOptions) {
- options["read"] = evaluatorFunctionOrOptions;
- }
- }
- if (typeof options["read"] != "function")
- throw Error("Pass a function that returns the value of the ko.computed");
-
- var writeFunction = options["write"];
- var state = {
- latestValue: undefined,
- isStale: true,
- isBeingEvaluated: false,
- suppressDisposalUntilDisposeWhenReturnsFalse: false,
- isDisposed: false,
- pure: false,
- isSleeping: false,
- readFunction: options["read"],
- evaluatorFunctionTarget: evaluatorFunctionTarget || options["owner"],
- disposeWhenNodeIsRemoved: options["disposeWhenNodeIsRemoved"] || options.disposeWhenNodeIsRemoved || null,
- disposeWhen: options["disposeWhen"] || options.disposeWhen,
- domNodeDisposalCallback: null,
- dependencyTracking: {},
- dependenciesCount: 0,
- evaluationTimeoutInstance: null
- };
-
- function computedObservable() {
- if (arguments.length > 0) {
- if (typeof writeFunction === "function") {
- // Writing a value
- writeFunction.apply(state.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(computedObservable);
- if (state.isStale || (state.isSleeping && computedObservable.haveDependenciesChanged())) {
- computedObservable.evaluateImmediate();
- }
- return state.latestValue;
- }
- }
-
- computedObservable[computedState] = state;
- computedObservable.hasWriteFunction = typeof writeFunction === "function";
-
- // Inherit from 'subscribable'
- if (!ko.utils.canSetPrototype) {
- // 'subscribable' won't be on the prototype chain unless we put it there directly
- ko.utils.extend(computedObservable, ko.subscribable['fn']);
- }
- ko.subscribable['fn'].init(computedObservable);
-
- // Inherit from 'computed'
- ko.utils.setPrototypeOfOrExtend(computedObservable, computedFn);
-
- if (options['pure']) {
- state.pure = true;
- state.isSleeping = true; // Starts off sleeping; will awake on the first subscription
- ko.utils.extend(computedObservable, pureComputedOverrides);
- } else if (options['deferEvaluation']) {
- ko.utils.extend(computedObservable, deferEvaluationOverrides);
- }
-
- if (ko.options['deferUpdates']) {
- ko.extenders['deferred'](computedObservable, true);
- }
-
- if (DEBUG) {
- // #1731 - Aid debugging by exposing the computed's options
- computedObservable["_options"] = options;
- }
-
- if (state.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.
- state.suppressDisposalUntilDisposeWhenReturnsFalse = true;
-
- // 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. In that case, clear the option so we don't try
- // to watch for a non-node's disposal. 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 (!state.disposeWhenNodeIsRemoved.nodeType) {
- state.disposeWhenNodeIsRemoved = null;
- }
- }
-
- // Evaluate, unless sleeping or deferEvaluation is true
- if (!state.isSleeping && !options['deferEvaluation']) {
- computedObservable.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 (state.disposeWhenNodeIsRemoved && computedObservable.isActive()) {
- ko.utils.domNodeDisposal.addDisposeCallback(state.disposeWhenNodeIsRemoved, state.domNodeDisposalCallback = function () {
- computedObservable.dispose();
- });
- }
-
- return computedObservable;
-};
-
-// Utility function that disposes a given dependencyTracking entry
-function computedDisposeDependencyCallback(id, entryToDispose) {
- if (entryToDispose !== null && entryToDispose.dispose) {
- entryToDispose.dispose();
- }
-}
-
-// This function gets called each time a dependency is detected while evaluating a computed.
-// It's factored out as a shared function to avoid creating unnecessary function instances during evaluation.
-function computedBeginDependencyDetectionCallback(subscribable, id) {
- var computedObservable = this.computedObservable,
- state = computedObservable[computedState];
- if (!state.isDisposed) {
- if (this.disposalCount && this.disposalCandidates[id]) {
- // Don't want to dispose this subscription, as it's still being used
- computedObservable.addDependencyTracking(id, subscribable, this.disposalCandidates[id]);
- this.disposalCandidates[id] = null; // No need to actually delete the property - disposalCandidates is a transient object anyway
- --this.disposalCount;
- } else if (!state.dependencyTracking[id]) {
- // Brand new subscription - add it
- computedObservable.addDependencyTracking(id, subscribable, state.isSleeping ? { _target: subscribable } : computedObservable.subscribeToDependency(subscribable));
- }
- }
-}
-
-var computedFn = {
- "equalityComparer": valuesArePrimitiveAndEqual,
- getDependenciesCount: function () {
- return this[computedState].dependenciesCount;
- },
- addDependencyTracking: function (id, target, trackingObj) {
- if (this[computedState].pure && target === this) {
- throw Error("A 'pure' computed must not be called recursively");
- }
-
- this[computedState].dependencyTracking[id] = trackingObj;
- trackingObj._order = this[computedState].dependenciesCount++;
- trackingObj._version = target.getVersion();
- },
- haveDependenciesChanged: function () {
- var id, dependency, dependencyTracking = this[computedState].dependencyTracking;
- for (id in dependencyTracking) {
- if (dependencyTracking.hasOwnProperty(id)) {
- dependency = dependencyTracking[id];
- if (dependency._target.hasChanged(dependency._version)) {
- return true;
- }
- }
- }
- },
- markDirty: function () {
- // Process "dirty" events if we can handle delayed notifications
- if (this._evalDelayed && !this[computedState].isBeingEvaluated) {
- this._evalDelayed();
- }
- },
- isActive: function () {
- return this[computedState].isStale || this[computedState].dependenciesCount > 0;
- },
- respondToChange: function () {
- // Ignore "change" events if we've already scheduled a delayed notification
- if (!this._notificationIsPending) {
- this.evaluatePossiblyAsync();
- }
- },
- subscribeToDependency: function (target) {
- if (target._deferUpdates && !this[computedState].disposeWhenNodeIsRemoved) {
- var dirtySub = target.subscribe(this.markDirty, this, 'dirty'),
- changeSub = target.subscribe(this.respondToChange, this);
- return {
- _target: target,
- dispose: function () {
- dirtySub.dispose();
- changeSub.dispose();
- }
- };
- } else {
- return target.subscribe(this.evaluatePossiblyAsync, this);
- }
- },
- evaluatePossiblyAsync: function () {
- var computedObservable = this,
- throttleEvaluationTimeout = computedObservable['throttleEvaluation'];
- if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
- clearTimeout(this[computedState].evaluationTimeoutInstance);
- this[computedState].evaluationTimeoutInstance = ko.utils.setTimeout(function () {
- computedObservable.evaluateImmediate(true /*notifyChange*/);
- }, throttleEvaluationTimeout);
- } else if (computedObservable._evalDelayed) {
- computedObservable._evalDelayed();
- } else {
- computedObservable.evaluateImmediate(true /*notifyChange*/);
- }
- },
- evaluateImmediate: function (notifyChange) {
- var computedObservable = this,
- state = computedObservable[computedState],
- disposeWhen = state.disposeWhen;
-
- if (state.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 (state.isDisposed) {
- return;
- }
-
- if (state.disposeWhenNodeIsRemoved && !ko.utils.domNodeIsAttachedToDocument(state.disposeWhenNodeIsRemoved) || disposeWhen && disposeWhen()) {
- // See comment above about suppressDisposalUntilDisposeWhenReturnsFalse
- if (!state.suppressDisposalUntilDisposeWhenReturnsFalse) {
- computedObservable.dispose();
- return;
- }
- } else {
- // It just did return false, so we can stop suppressing now
- state.suppressDisposalUntilDisposeWhenReturnsFalse = false;
- }
-
- state.isBeingEvaluated = true;
- try {
- this.evaluateImmediate_CallReadWithDependencyDetection(notifyChange);
- } finally {
- state.isBeingEvaluated = false;
- }
-
- if (!state.dependenciesCount) {
- computedObservable.dispose();
- }
- },
- evaluateImmediate_CallReadWithDependencyDetection: function (notifyChange) {
- // This function is really just part of the evaluateImmediate logic. You would never call it from anywhere else.
- // Factoring it out into a separate function means it can be independent of the try/catch block in evaluateImmediate,
- // which contributes to saving about 40% off the CPU overhead of computed evaluation (on V8 at least).
-
- var computedObservable = this,
- state = computedObservable[computedState];
-
- // 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 isInitial = state.pure ? undefined : !state.dependenciesCount, // If we're evaluating when there are no previous dependencies, it must be the first time
- dependencyDetectionContext = {
- computedObservable: computedObservable,
- disposalCandidates: state.dependencyTracking,
- disposalCount: state.dependenciesCount
- };
-
- ko.dependencyDetection.begin({
- callbackTarget: dependencyDetectionContext,
- callback: computedBeginDependencyDetectionCallback,
- computed: computedObservable,
- isInitial: isInitial
- });
-
- state.dependencyTracking = {};
- state.dependenciesCount = 0;
-
- var newValue = this.evaluateImmediate_CallReadThenEndDependencyDetection(state, dependencyDetectionContext);
-
- if (computedObservable.isDifferent(state.latestValue, newValue)) {
- if (!state.isSleeping) {
- computedObservable["notifySubscribers"](state.latestValue, "beforeChange");
- }
-
- state.latestValue = newValue;
-
- if (state.isSleeping) {
- computedObservable.updateVersion();
- } else if (notifyChange) {
- computedObservable["notifySubscribers"](state.latestValue);
- }
- }
-
- if (isInitial) {
- computedObservable["notifySubscribers"](state.latestValue, "awake");
- }
- },
- evaluateImmediate_CallReadThenEndDependencyDetection: function (state, dependencyDetectionContext) {
- // This function is really part of the evaluateImmediate_CallReadWithDependencyDetection logic.
- // You'd never call it from anywhere else. Factoring it out means that evaluateImmediate_CallReadWithDependencyDetection
- // can be independent of try/finally blocks, which contributes to saving about 40% off the CPU
- // overhead of computed evaluation (on V8 at least).
-
- try {
- var readFunction = state.readFunction;
- return state.evaluatorFunctionTarget ? readFunction.call(state.evaluatorFunctionTarget) : readFunction();
- } finally {
- ko.dependencyDetection.end();
-
- // For each subscription no longer being used, remove it from the active subscriptions list and dispose it
- if (dependencyDetectionContext.disposalCount && !state.isSleeping) {
- ko.utils.objectForEach(dependencyDetectionContext.disposalCandidates, computedDisposeDependencyCallback);
- }
-
- state.isStale = false;
- }
- },
- peek: function () {
- // Peek won't re-evaluate, except while the computed is sleeping or to get the initial value when "deferEvaluation" is set.
- var state = this[computedState];
- if ((state.isStale && !state.dependenciesCount) || (state.isSleeping && this.haveDependenciesChanged())) {
- this.evaluateImmediate();
- }
- return state.latestValue;
- },
- limit: function (limitFunction) {
- // Override the limit function with one that delays evaluation as well
- ko.subscribable['fn'].limit.call(this, limitFunction);
- this._evalDelayed = function () {
- this._limitBeforeChange(this[computedState].latestValue);
-
- this[computedState].isStale = true; // Mark as dirty
-
- // Pass the observable to the "limit" code, which will access it when
- // it's time to do the notification.
- this._limitChange(this);
- }
- },
- dispose: function () {
- var state = this[computedState];
- if (!state.isSleeping && state.dependencyTracking) {
- ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {
- if (dependency.dispose)
- dependency.dispose();
- });
- }
- if (state.disposeWhenNodeIsRemoved && state.domNodeDisposalCallback) {
- ko.utils.domNodeDisposal.removeDisposeCallback(state.disposeWhenNodeIsRemoved, state.domNodeDisposalCallback);
- }
- state.dependencyTracking = null;
- state.dependenciesCount = 0;
- state.isDisposed = true;
- state.isStale = false;
- state.isSleeping = false;
- state.disposeWhenNodeIsRemoved = null;
- }
-};
-
-var pureComputedOverrides = {
- beforeSubscriptionAdd: function (event) {
- // If asleep, wake up the computed by subscribing to any dependencies.
- var computedObservable = this,
- state = computedObservable[computedState];
- if (!state.isDisposed && state.isSleeping && event == 'change') {
- state.isSleeping = false;
- if (state.isStale || computedObservable.haveDependenciesChanged()) {
- state.dependencyTracking = null;
- state.dependenciesCount = 0;
- state.isStale = true;
- computedObservable.evaluateImmediate();
- } else {
- // First put the dependencies in order
- var dependeciesOrder = [];
- ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {
- dependeciesOrder[dependency._order] = id;
- });
- // Next, subscribe to each one
- ko.utils.arrayForEach(dependeciesOrder, function (id, order) {
- var dependency = state.dependencyTracking[id],
- subscription = computedObservable.subscribeToDependency(dependency._target);
- subscription._order = order;
- subscription._version = dependency._version;
- state.dependencyTracking[id] = subscription;
- });
- }
- if (!state.isDisposed) { // test since evaluating could trigger disposal
- computedObservable["notifySubscribers"](state.latestValue, "awake");
- }
- }
- },
- afterSubscriptionRemove: function (event) {
- var state = this[computedState];
- if (!state.isDisposed && event == 'change' && !this.hasSubscriptionsForEvent('change')) {
- ko.utils.objectForEach(state.dependencyTracking, function (id, dependency) {
- if (dependency.dispose) {
- state.dependencyTracking[id] = {
- _target: dependency._target,
- _order: dependency._order,
- _version: dependency._version
- };
- dependency.dispose();
- }
- });
- state.isSleeping = true;
- this["notifySubscribers"](undefined, "asleep");
- }
- },
- getVersion: function () {
- // 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.
- var state = this[computedState];
- if (state.isSleeping && (state.isStale || this.haveDependenciesChanged())) {
- this.evaluateImmediate();
- }
- return ko.subscribable['fn'].getVersion.call(this);
- }
-};
-
-var deferEvaluationOverrides = {
- beforeSubscriptionAdd: function (event) {
- // This will force a computed with deferEvaluation to evaluate when the first subscription is registered.
- if (event == 'change' || event == 'beforeChange') {
- this.peek();
- }
- }
-};
-
-// Note that for browsers that don't support proto assignment, the
-// inheritance chain is created manually in the ko.computed constructor
-if (ko.utils.canSetPrototype) {
- ko.utils.setPrototypeOf(computedFn, ko.subscribable['fn']);
-}
-
-// Set the proto chain values for ko.hasPrototype
-var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
-ko.computed[protoProp] = ko.observable;
-computedFn[protoProp] = ko.computed;
-
-ko.isComputed = function (instance) {
- return ko.hasPrototype(instance, ko.computed);
-};
-
-ko.isPureComputed = function (instance) {
- return ko.hasPrototype(instance, ko.computed)
- && instance[computedState] && instance[computedState].pure;
-};
-
-ko.exportSymbol('computed', ko.computed);
-ko.exportSymbol('dependentObservable', ko.computed); // export ko.dependentObservable for backwards compatibility (1.x)
-ko.exportSymbol('isComputed', ko.isComputed);
-ko.exportSymbol('isPureComputed', ko.isPureComputed);
-ko.exportSymbol('computed.fn', computedFn);
-ko.exportProperty(computedFn, 'peek', computedFn.peek);
-ko.exportProperty(computedFn, 'dispose', computedFn.dispose);
-ko.exportProperty(computedFn, 'isActive', computedFn.isActive);
-ko.exportProperty(computedFn, 'getDependenciesCount', computedFn.getDependenciesCount);
-
-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 RegExp)) && (!(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., blah)
- // 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 === "";
-
- var startCommentRegex = commentNodesHaveTextProperty ? /^$/ : /^\s*ko(?:\s+([\s\S]+))?\s*$/;
- var endCommentRegex = commentNodesHaveTextProperty ? /^$/ : /^\s*\/ko\s*$/;
- 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
OK
Another, returns: Another
- // from
OK
, returns:
- 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 tags as if they don't exist, thereby moving comment nodes
- // that are direct descendants of
into the preceding
)
- 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.
- var bindingDoesNotRecurseIntoElementTypes = {
- // Don't want bindings that operate on text nodes to mutate