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+/**
+ * @class YAHOO.ext.View
+ * @extends YAHOO.ext.util.Observable
+ * Create a "View" for an element based on a data model or UpdateManager and the supplied DomHelper template.
+ * This class also supports single and multi selection modes. <br>
+ * Create a data model bound view:
+<pre><code>
+var dataModel = new YAHOO.ext.grid.XMLDataModel(...);
+var view = new YAHOO.ext.View('my-element',
+ '&lt;div id="{0}"&gt;{2} - {1}&lt;/div&gt;', // auto create template
+ dataModel, {
+ singleSelect: true,
+ selectedClass: 'ydataview-selected'
+ });
+
+// listen for node click?
+view.on('click', function(vw, index, node, e){
+ alert('Node "' + node.id + '" at index: ' + index + ' was clicked.');
+});
+
+// load XML data
+dataModel.load('foobar.xml');
+</code></pre>
+For an example of creating a JSON/UpdateManager view, see {@link YAHOO.ext.JsonView}.
+ * <br><br>
+ * <b>Note: The root of your template must be a single node. Table/row implementations may work but are not supported due to
+ * IE's limited insertion support with tables and Opera's faulty event bubbling.</b>
+ * @constructor
+ * Create a new View
+ * @param {String/HTMLElement/Element} container The container element where the view is to be rendered.
+ * @param {String/DomHelper.Template} tpl The rendering template or a string to create a template with
+ * @param {DataModel} dataModel The bound data model
+ * @param {Object} config The config object
+*/
+YAHOO.ext.View = function(container, tpl, dataModel, config){
+ this.el = getEl(container, true);
+ this.nodes = this.el.dom.childNodes;
+ if(typeof tpl == 'string'){
+ tpl = new YAHOO.ext.Template(tpl);
+ }
+ tpl.compile();
+ /**
+ * The template used by this View
+ * @type {YAHOO.ext.DomHelper.Template}
+ */
+ this.tpl = tpl;
+ this.setDataModel(dataModel);
+ var CE = YAHOO.util.CustomEvent;
+ /** @private */
+ this.events = {
+ /**
+ * @event beforeclick
+ * Fires before a click is processed. Returns false to cancel the default action.
+ * @param {YAHOO.ext.View} this
+ * @param {Number} index The index of the target node
+ * @param {HTMLElement} node The target node
+ * @param {YAHOO.ext.EventObject} e The raw event object
+ */
+ 'beforeclick' : true,
+ /**
+ * @event click
+ * Fires when a template node is clicked.
+ * @param {YAHOO.ext.View} this
+ * @param {Number} index The index of the target node
+ * @param {HTMLElement} node The target node
+ * @param {YAHOO.ext.EventObject} e The raw event object
+ */
+ 'click' : true,
+ /**
+ * @event dblclick
+ * Fires when a template node is double clicked.
+ * @param {YAHOO.ext.View} this
+ * @param {Number} index The index of the target node
+ * @param {HTMLElement} node The target node
+ * @param {YAHOO.ext.EventObject} e The raw event object
+ */
+ 'dblclick' : true,
+ /**
+ * @event contextmenu
+ * Fires when a template node is right clicked.
+ * @param {YAHOO.ext.View} this
+ * @param {Number} index The index of the target node
+ * @param {HTMLElement} node The target node
+ * @param {YAHOO.ext.EventObject} e The raw event object
+ */
+ 'contextmenu' : true,
+ /**
+ * @event selectionchange
+ * Fires when the selected nodes change.
+ * @param {YAHOO.ext.View} this
+ * @param {Array} selections Array of the selected nodes
+ */
+ 'selectionchange' : true,
+
+ /**
+ * @event beforeselect
+ * Fires before a selection is made. If any handlers return false, the selection is cancelled.
+ * @param {YAHOO.ext.View} this
+ * @param {HTMLElement} node The node to be selected
+ * @param {Array} selections Array of currently selected nodes
+ */
+ 'beforeselect' : true
+ };
+ this.el.mon("click", this.onClick, this, true);
+ this.el.mon("dblclick", this.onDblClick, this, true);
+ this.el.mon("contextmenu", this.onContextMenu, this, true);
+
+ /**
+ * The css class to add to selected nodes
+ * @type {YAHOO.ext.DomHelper.Template}
+ */
+ this.selectedClass = 'ydataview-selected';
+
+ this.emptyText = '';
+
+ this.selections = [];
+
+ this.lastSelection = null;
+
+ /**
+ * The root property in the loaded json object that contains the data
+ * @type {String}
+ */
+ this.jsonRoot = null;
+ YAHOO.ext.util.Config.apply(this, config);
+ if(this.renderUpdates || this.jsonRoot){
+ var um = this.el.getUpdateManager();
+ um.setRenderer(this);
+ }
+};
+
+YAHOO.extendX(YAHOO.ext.View, YAHOO.ext.util.Observable, {
+ /**
+ * Returns the element this view is bound to.
+ * @return {YAHOO.ext.Element}
+ */
+ getEl : function(){
+ return this.el;
+ },
+
+ render : function(el, response){
+ this.clearSelections();
+ this.el.update('');
+ var o;
+ try{
+ o = YAHOO.ext.util.JSON.decode(response.responseText);
+ if(this.jsonRoot){
+ o = eval('o.' + this.jsonRoot);
+ }
+ }catch(e){}
+ /**
+ * The current json data or null
+ */
+ this.jsonData = o;
+ this.beforeRender();
+ this.refresh();
+ },
+
+ beforeRender : function(){
+
+ },
+
+ /**
+ * Refreshes the view.
+ */
+ refresh : function(){
+ this.clearSelections();
+ this.el.update('');
+ this.html = [];
+ if(this.renderUpdates || this.jsonRoot){
+ var o = this.jsonData;
+ if(o){
+ for(var i = 0, len = o.length; i < len; i++) {
+ this.renderEach(o[i]);
+ }
+ }
+ }else{
+ this.dataModel.each(this.renderEach, this);
+ }
+ var strHtml;
+ if(this.html.length > 0){
+ strHtml = this.html.join('');
+ }else{
+ strHtml = this.emptyText;
+ }
+ this.el.update(strHtml);
+ this.html = null;
+ this.nodes = this.el.dom.childNodes;
+ this.updateIndexes(0);
+ },
+
+ /**
+ * Function to override to reformat the data that is sent to
+ * the template for each node.
+ * @param {Array/Object} data The raw data (array of colData for a data model bound view or
+ * a JSON object for an UpdateManager bound view).
+ * @param {Number} index The index of the data within the data model
+ */
+ prepareData : function(data, index){
+ return data;
+ },
+
+ renderEach : function(data){
+ this.html[this.html.length] = this.tpl.applyTemplate(this.prepareData(data));
+ },
+
+ /**
+ * Refresh an individual node.
+ * @param {Number} index
+ */
+ refreshNode : function(index){
+ this.refreshNodes(index, index);
+ },
+
+ refreshNodes : function(dm, startIndex, endIndex){
+ this.clearSelections();
+ var dm = this.dataModel;
+ var ns = this.nodes;
+ for(var i = startIndex; i <= endIndex; i++){
+ var d = this.prepareData(dm.getRow(i), i);
+ if(i < ns.length-1){
+ var old = ns[i];
+ this.tpl.insertBefore(old, d);
+ this.el.dom.removeChild(old);
+ }else{
+ this.tpl.append(this.el.dom, d);
+ }
+ }
+ this.updateIndexes(startIndex, endIndex);
+ },
+
+ deleteNodes : function(dm, startIndex, endIndex){
+ this.clearSelections();
+ if(startIndex == 0 && endIndex >= this.nodes.length-1){
+ this.el.update('');
+ }else{
+ var el = this.el.dom;
+ for(var i = startIndex; i <= endIndex; i++){
+ el.removeChild(this.nodes[startIndex]);
+ }
+ this.updateIndexes(startIndex);
+ }
+ },
+
+ insertNodes : function(dm, startIndex, endIndex){
+ if(this.nodes.length == 0){
+ this.refresh();
+ }else{
+ this.clearSelections();
+ var t = this.tpl;
+ var before = this.nodes[startIndex];
+ var dm = this.dataModel;
+ if(before){
+ for(var i = startIndex; i <= endIndex; i++){
+ t.insertBefore(before, this.prepareData(dm.getRow(i), i));
+ }
+ }else{
+ var el = this.el.dom;
+ for(var i = startIndex; i <= endIndex; i++){
+ t.append(el, this.prepareData(dm.getRow(i), i));
+ }
+ }
+ this.updateIndexes(startIndex);
+ }
+ },
+
+ updateIndexes : function(dm, startIndex, endIndex){
+ var ns = this.nodes;
+ startIndex = startIndex || 0;
+ endIndex = endIndex || ns.length-1;
+ for(var i = startIndex; i <= endIndex; i++){
+ ns[i].nodeIndex = i;
+ }
+ },
+
+ /**
+ * Changes the data model this view uses and refresh the view.
+ * @param {DataModel} dataModel
+ */
+ setDataModel : function(dm){
+ if(!dm) return;
+ this.unplugDataModel(this.dataModel);
+ this.dataModel = dm;
+ dm.on('cellupdated', this.refreshNode, this, true);
+ dm.on('datachanged', this.refresh, this, true);
+ dm.on('rowsdeleted', this.deleteNodes, this, true);
+ dm.on('rowsinserted', this.insertNodes, this, true);
+ dm.on('rowsupdated', this.refreshNodes, this, true);
+ dm.on('rowssorted', this.refresh, this, true);
+ this.refresh();
+ },
+
+ /**
+ * Unplug the data model and stop updates.
+ * @param {DataModel} dataModel
+ */
+ unplugDataModel : function(dm){
+ if(!dm) return;
+ dm.removeListener('cellupdated', this.refreshNode, this);
+ dm.removeListener('datachanged', this.refresh, this);
+ dm.removeListener('rowsdeleted', this.deleteNodes, this);
+ dm.removeListener('rowsinserted', this.insertNodes, this);
+ dm.removeListener('rowsupdated', this.refreshNodes, this);
+ dm.removeListener('rowssorted', this.refresh, this);
+ this.dataModel = null;
+ },
+
+ /**
+ * Returns the template node the passed child belongs to or null if it doesn't belong to one.
+ * @param {HTMLElement} node
+ * @return {HTMLElement} The template node
+ */
+ findItemFromChild : function(node){
+ var el = this.el.dom;
+ if(!node || node.parentNode == el){
+ return node;
+ }
+ var p = node.parentNode;
+ while(p && p != el){
+ if(p.parentNode == el){
+ return p;
+ }
+ p = p.parentNode;
+ }
+ return null;
+ },
+
+ /** @ignore */
+ onClick : function(e){
+ var item = this.findItemFromChild(e.getTarget());
+ if(item){
+ var index = this.indexOf(item);
+ if(this.onItemClick(item, index, e) !== false){
+ this.fireEvent('click', this, index, item, e);
+ }
+ }else{
+ this.clearSelections();
+ }
+ },
+
+ /** @ignore */
+ onContextMenu : function(e){
+ var item = this.findItemFromChild(e.getTarget());
+ if(item){
+ this.fireEvent('contextmenu', this, this.indexOf(item), item, e);
+ }
+ },
+
+ /** @ignore */
+ onDblClick : function(e){
+ var item = this.findItemFromChild(e.getTarget());
+ if(item){
+ this.fireEvent('dblclick', this, this.indexOf(item), item, e);
+ }
+ },
+
+ onItemClick : function(item, index, e){
+ if(this.fireEvent('beforeclick', this, index, item, e) !== false){
+ if(this.multiSelect || this.singleSelect){
+ if(this.multiSelect && e.shiftKey && this.lastSelection){
+ this.select(this.getNodes(this.indexOf(this.lastSelection), index), false);
+ }else{
+ this.select(item, this.multiSelect && e.ctrlKey);
+ this.lastSelection = item;
+ }
+ e.preventDefault();
+ }
+ return true;
+ }else{
+ return false;
+ }
+ },
+
+ /**
+ * Get the number of selected nodes.
+ * @return {Number}
+ */
+ getSelectionCount : function(){
+ return this.selections.length;
+ },
+
+ /**
+ * Get the currently selected nodes.
+ * @return {Array} An array of HTMLElements
+ */
+ getSelectedNodes : function(){
+ return this.selections;
+ },
+
+ /**
+ * Get the indexes of the selected nodes.
+ * @return {Array}
+ */
+ getSelectedIndexes : function(){
+ var indexes = [];
+ for(var i = 0, len = this.selections.length; i < len; i++) {
+ indexes.push(this.selections[i].nodeIndex);
+ }
+ return indexes;
+ },
+
+ /**
+ * Clear all selections
+ * @param {Boolean} suppressEvent (optional) true to skip firing of the selectionchange event
+ */
+ clearSelections : function(suppressEvent){
+ if(this.multiSelect || this.singleSelect){
+ YAHOO.util.Dom.removeClass(this.selections, this.selectedClass);
+ this.selections = [];
+ if(!suppressEvent){
+ this.fireEvent('selectionchange', this, this.selections);
+ }
+ }
+ },
+
+ /**
+ * Returns true if the passed node is selected
+ * @param {HTMLElement/Number} node The node or node index
+ * @return {Boolean}
+ */
+ isSelected : function(node){
+ node = this.getNode(node);
+ var s = this.selections;
+ if(s.length < 1){
+ return false;
+ }
+ if(s.indexOf){
+ return s.indexOf(node) !== -1;
+ }else{
+ for(var i = 0, len = s.length; i < len; i++){
+ if (s[i] == node){
+ return true;
+ }
+ }
+ return false;
+ }
+ },
+
+ /**
+ * Selects nodes.
+ * @param {Array/HTMLElement/String/Number} nodeInfo An HTMLElement template node, index of a template node, id of a template node or an array of any of those to select
+ * @param {Boolean} keepExisting (optional) true to keep existing selections
+ * @param {Boolean} suppressEvent (optional) true to skip firing of the selectionchange vent
+ */
+ select : function(nodeInfo, keepExisting, suppressEvent){
+ if(!keepExisting){
+ this.clearSelections(true);
+ }
+ if(nodeInfo instanceof Array){
+ for(var i = 0, len = nodeInfo.length; i < len; i++) {
+ this.select(nodeInfo[i], true, true);
+ }
+ }else{
+ var node = this.getNode(nodeInfo);
+ if(node && !this.isSelected(node)){
+ if(this.fireEvent('beforeselect', this, node, this.selections) !== false){
+ YAHOO.util.Dom.addClass(node, this.selectedClass);
+ this.selections.push(node);
+ }
+ }
+ }
+ if(!suppressEvent){
+ this.fireEvent('selectionchange', this, this.selections);
+ }
+ },
+
+ /**
+ * Gets a template node.
+ * @param {HTMLElement/String/Number} nodeInfo An HTMLElement template node, index of a template node or the id of a template node
+ * @return {HTMLElement} The node or null if it wasn't found
+ */
+ getNode : function(nodeInfo){
+ if(typeof nodeInfo == 'object'){
+ return nodeInfo;
+ }else if(typeof nodeInfo == 'string'){
+ return document.getElementById(nodeInfo);
+ }else if(typeof nodeInfo == 'number'){
+ return this.nodes[nodeInfo];
+ }
+ return null;
+ },
+
+ /**
+ * Gets a range template nodes.
+ * @param {Number} startIndex
+ * @param {Number} endIndex
+ * @return {Array} An array of nodes
+ */
+ getNodes : function(start, end){
+ var ns = this.nodes;
+ start = start || 0;
+ end = typeof end == 'undefined' ? ns.length-1 : end;
+ var nodes = [];
+ if(start <= end){
+ for(var i = start; i <= end; i++) {
+ nodes.push(ns[i]);
+ }
+ }else{
+ for(var i = start; i >= end; i--) {
+ nodes.push(ns[i]);
+ }
+ }
+ return nodes;
+ },
+
+ /**
+ * Finds the index of the passed node
+ * @param {HTMLElement/String/Number} nodeInfo An HTMLElement template node, index of a template node or the id of a template node
+ * @return {Number} The index of the node or -1
+ */
+ indexOf : function(node){
+ node = this.getNode(node);
+ if(typeof node.nodeIndex == 'number'){
+ return node.nodeIndex;
+ }
+ var ns = this.nodes;
+ for(var i = 0, len = ns.length; i < len; i++) {
+ if(ns[i] == node){
+ return i;
+ }
+ }
+ return -1;
+ }
+});
+
+/**
+ * @class YAHOO.ext.JsonView
+ * @extends YAHOO.ext.View
+ * Shortcut class to create a JSON + UpdateManager template view. Usage:
+<pre><code>
+var view = new YAHOO.ext.JsonView('my-element',
+ '&lt;div id="{id}"&gt;{foo} - {bar}&lt;/div&gt;', // auto create template
+ { multiSelect: true, jsonRoot: 'data' });
+
+// listen for node click?
+view.on('click', function(vw, index, node, e){
+ alert('Node "' + node.id + '" at index: ' + index + ' was clicked.');
+});
+
+// direct load of JSON data
+view.load('foobar.php');
+
+
+// Example from my blog list
+var tpl = new YAHOO.ext.Template(
+ '&lt;div class="entry"&gt;' +
+ '&lt;a class="entry-title" href="{link}"&gt;{title}&lt;/a&gt;' +
+ '&lt;h4&gt;{date} by {author} | {comments} Comments&lt;/h4&gt;{description}' +
+ '&lt;/div&gt;&lt;hr /&gt;'
+);
+
+var moreView = new YAHOO.ext.JsonView('entry-list', tpl, {
+ jsonRoot: 'posts'
+});
+moreView.on('beforerender', this.sortEntries, this, true);
+moreView.load({
+ url:'/blog/get-posts.php',
+ params: 'allposts=true',
+ text:'Loading Blog Entries...'
+});
+</code></pre>
+ * @constructor
+ * Create a new JsonView
+ * @param {String/HTMLElement/Element} container The container element where the view is to be rendered.
+ * @param {DomHelper.Template} tpl The rendering template
+ * @param {Object} config The config object
+ */
+YAHOO.ext.JsonView = function(container, tpl, config){
+ var cfg = config || {};
+ cfg.renderUpdates = true;
+ YAHOO.ext.JsonView.superclass.constructor.call(this, container, tpl, null, cfg);
+ /**
+ * @event beforerender
+ * Fires before rendering of the downloaded json data.
+ * @param {YAHOO.ext.View} this
+ * @param {Object} data The json data loaded
+ */
+ this.events['beforerender'] = true;
+ /**
+ * @event load
+ * Fires when data is loaded.
+ * @param {YAHOO.ext.View} this
+ * @param {Object} data The json data loaded
+ * @param {Object} response The raw Connect response object
+ */
+ this.events['load'] = true;
+ /**
+ * @event loadexception
+ * Fires when loading fails.
+ * @param {YAHOO.ext.View} this
+ * @param {Object} response The raw Connect response object
+ */
+ this.events['loadexception'] = true;
+ this.el.getUpdateManager().on('update', this.onLoad, this, true);
+ this.el.getUpdateManager().on('failure', this.onLoadException, this, true);
+};
+YAHOO.extendX(YAHOO.ext.JsonView, YAHOO.ext.View, {
+ /**
+ * Performs an async request, loading the JSON from the response. If params are specified it uses POST, otherwise it uses GET.
+ * @param {Object/String/Function} url The url for this request or a function to call to get the url or a config object containing any of the following options:
+<pre><code>
+view.load({
+ url: 'your-url.php',<br/>
+ params: {param1: 'foo', param2: 'bar'}, // or a URL encoded string<br/>
+ callback: yourFunction,<br/>
+ scope: yourObject, //(optional scope) <br/>
+ discardUrl: false, <br/>
+ nocache: false,<br/>
+ text: 'Loading...',<br/>
+ timeout: 30,<br/>
+ scripts: false<br/>
+});
+</code></pre>
+ * The only required property is url. The optional properties nocache, text and scripts
+ * are shorthand for disableCaching, indicatorText and loadScripts and are used to set their associated property on this UpdateManager instance.
+ * @param {<i>String/Object</i>} params (optional) The parameters to pass as either a url encoded string "param1=1&amp;param2=2" or an object {param1: 1, param2: 2}
+ * @param {<i>Function</i>} callback (optional) Callback when transaction is complete - called with signature (oElement, bSuccess)
+ * @param {<i>Boolean</i>} discardUrl (optional) By default when you execute an update the defaultUrl is changed to the last used url. If true, it will not store the url.
+ */
+ load : function(){
+ var um = this.el.getUpdateManager();
+ um.update.apply(um, arguments);
+ },
+
+ /**
+ * Get the number of records in the current JSON dataset
+ * @return {Number}
+ */
+ getCount : function(){
+ return this.jsonData ? this.jsonData.length : 0;
+ },
+
+ /**
+ * Returns the JSON object for the specified node(s)
+ * @param {HTMLElement/Array} node The node or an array of nodes
+ * @return {Object/Array} If you pass in an array, you get an array back, otherwise
+ * you get the JSON object for the node
+ */
+ getNodeData : function(node){
+ if(node instanceof Array){
+ var data = [];
+ for(var i = 0, len = node.length; i < len; i++){
+ data.push(this.getNodeData(node[i]));
+ }
+ return data;
+ }
+ return this.jsonData[this.indexOf(node)] || null;
+ },
+
+ beforeRender : function(){
+ this.snapshot = this.jsonData;
+ if(this.sortInfo){
+ this.sort.apply(this, this.sortInfo);
+ }
+ this.fireEvent('beforerender', this, this.jsonData);
+ },
+
+ onLoad : function(el, o){
+ this.fireEvent('load', this, this.jsonData, o);
+ },
+
+ onLoadException : function(el, o){
+ this.fireEvent('loadexception', this, o);
+ },
+
+ /**
+ * Filter the data by a specific property.
+ * @param {String} property A property on your JSON objects
+ * @param {String/RegExp} value Either string that the property values
+ * should start with or a RegExp to test against the property
+ */
+ filter : function(property, value){
+ if(this.jsonData){
+ var data = [];
+ var ss = this.snapshot;
+ if(typeof value == 'string'){
+ var vlen = value.length;
+ if(vlen == 0){
+ this.clearFilter();
+ return;
+ }
+ value = value.toLowerCase();
+ for(var i = 0, len = ss.length; i < len; i++){
+ var o = ss[i];
+ if(o[property].substr(0, vlen).toLowerCase() == value){
+ data.push(o);
+ }
+ }
+ }else if(value.exec){ // regex?
+ for(var i = 0, len = ss.length; i < len; i++){
+ var o = ss[i];
+ if(value.test(o[property])){
+ data.push(o);
+ }
+ }
+ }else{
+ return;
+ }
+ this.jsonData = data;
+ this.refresh();
+ }
+ },
+
+ /**
+ * Filter by a function. The passed function will be called with each
+ * object in the current dataset. If the function returns true, the value is kept
+ * otherwise it is filtered.
+ * @param {Function} fn
+ * @param {Object} scope (optional) The scope of the function (defaults to this JsonView)
+ */
+ filterBy : function(fn, scope){
+ if(this.jsonData){
+ var data = [];
+ var ss = this.snapshot;
+ for(var i = 0, len = ss.length; i < len; i++){
+ var o = ss[i];
+ if(fn.call(scope|| this, o)){
+ data.push(o);
+ }
+ }
+ this.jsonData = data;
+ this.refresh();
+ }
+ },
+
+ /**
+ * Clears the current filter.
+ */
+ clearFilter : function(){
+ if(this.snapshot && this.jsonData != this.snapshot){
+ this.jsonData = this.snapshot;
+ this.refresh();
+ }
+ },
+
+
+ /**
+ * Sorts the data for this view and refreshes it.
+ * @param {String} property A property on your JSON objects to sort on
+ * @param {String} direction (optional) desc or asc (defaults to asc)
+ * @param {Function} sortType (optional) A function to call to convert the data to a sortable value.
+ */
+ sort : function(property, dir, sortType){
+ this.sortInfo = Array.prototype.slice.call(arguments, 0);
+ if(this.jsonData){
+ var p = property;
+ var dsc = dir && dir.toLowerCase() == 'desc';
+ var f = function(o1, o2){
+ var v1 = sortType ? sortType(o1[p]) : o1[p];
+ var v2 = sortType ? sortType(o2[p]) : o2[p];;
+ if(v1 < v2){
+ return dsc ? +1 : -1;
+ }else if(v1 > v2){
+ return dsc ? -1 : +1;
+ }else{
+ return 0;
+ }
+ };
+ this.jsonData.sort(f);
+ this.refresh();
+ if(this.jsonData != this.snapshot){
+ this.snapshot.sort(f);
+ }
+ }
+ }
+});