4 * Copyright(c) 2006-2007, Ext JS, LLC.
6 * Originally Released Under LGPL - original licence link has changed is not relivant.
9 * <script type="text/javascript">
15 * Shortcut class to create a JSON + {@link Roo.UpdateManager} template view. Usage:
17 var view = new Roo.JsonView("my-element",
18 '<div id="{id}">{foo} - {bar}</div>', // auto create template
19 { multiSelect: true, jsonRoot: "data" }
22 // listen for node click?
23 view.on("click", function(vw, index, node, e){
24 alert('Node "' + node.id + '" at index: ' + index + " was clicked.");
27 // direct load of JSON data
28 view.load("foobar.php");
30 // Example from my blog list
31 var tpl = new Roo.Template(
32 '<div class="entry">' +
33 '<a class="entry-title" href="{link}">{title}</a>' +
34 "<h4>{date} by {author} | {comments} Comments</h4>{description}" +
35 "</div><hr />"
38 var moreView = new Roo.JsonView("entry-list", tpl, {
41 moreView.on("beforerender", this.sortEntries, this);
43 url: "/blog/get-posts.php",
44 params: "allposts=true",
45 text: "Loading Blog Entries..."
49 * Create a new JsonView
50 * @param {String/HTMLElement/Element} container The container element where the view is to be rendered.
51 * @param {Template} tpl The rendering template
52 * @param {Object} config The config object
54 Roo.JsonView = function(container, tpl, config){
56 if (typeof(tpl) == 'undefined') {
57 // universal constructor..
63 Roo.JsonView.superclass.constructor.call(this, container, tpl, config);
65 var um = this.el.getUpdateManager();
67 um.on("update", this.onLoad, this);
68 um.on("failure", this.onLoadException, this);
72 * Fires before rendering of the downloaded JSON data.
73 * @param {Roo.JsonView} this
74 * @param {Object} data The JSON data loaded
78 * Fires when data is loaded.
79 * @param {Roo.JsonView} this
80 * @param {Object} data The JSON data loaded
81 * @param {Object} response The raw Connect response object
84 * @event loadexception
85 * Fires when loading fails.
86 * @param {Roo.JsonView} this
87 * @param {Object} response The raw Connect response object
90 'beforerender' : true,
92 'loadexception' : true
95 Roo.extend(Roo.JsonView, Roo.View, {
97 * The root property in the loaded JSON object that contains the data
103 * Refreshes the view.
105 refresh : function(){
106 this.clearSelections();
109 var o = this.jsonData;
110 if(o && o.length > 0){
111 for(var i = 0, len = o.length; i < len; i++){
112 var data = this.prepareData(o[i], i, o);
113 html[html.length] = this.tpl.apply(data);
116 html.push(this.emptyText);
118 this.el.update(html.join(""));
119 this.nodes = this.el.dom.childNodes;
120 this.updateIndexes(0);
124 * Performs an async HTTP request, and loads the JSON from the response. If <i>params</i> are specified it uses POST, otherwise it uses GET.
125 * @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:
129 params: {param1: "foo", param2: "bar"}, // or a URL encoded string
130 callback: yourFunction,
131 scope: yourObject, //(optional scope)
139 * The only required property is <i>url</i>. The optional properties <i>nocache</i>, <i>text</i> and <i>scripts</i>
140 * are respectively shorthand for <i>disableCaching</i>, <i>indicatorText</i>, and <i>loadScripts</i> and are used to set their associated property on this UpdateManager instance.
141 * @param {String/Object} params (optional) The parameters to pass, as either a URL encoded string "param1=1&param2=2" or an object {param1: 1, param2: 2}
142 * @param {Function} callback (optional) Callback when transaction is complete - called with signature (oElement, bSuccess)
143 * @param {Boolean} 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.
146 var um = this.el.getUpdateManager();
147 um.update.apply(um, arguments);
150 render : function(el, response){
151 this.clearSelections();
155 o = Roo.util.JSON.decode(response.responseText);
158 o = /** eval:var:o */ eval("o." + this.jsonRoot);
163 * The current JSON data or null
171 * Get the number of records in the current JSON dataset
174 getCount : function(){
175 return this.jsonData ? this.jsonData.length : 0;
179 * Returns the JSON object for the specified node(s)
180 * @param {HTMLElement/Array} node The node or an array of nodes
181 * @return {Object/Array} If you pass in an array, you get an array back, otherwise
182 * you get the JSON object for the node
184 getNodeData : function(node){
185 if(node instanceof Array){
187 for(var i = 0, len = node.length; i < len; i++){
188 data.push(this.getNodeData(node[i]));
192 return this.jsonData[this.indexOf(node)] || null;
195 beforeRender : function(){
196 this.snapshot = this.jsonData;
198 this.sort.apply(this, this.sortInfo);
200 this.fireEvent("beforerender", this, this.jsonData);
203 onLoad : function(el, o){
204 this.fireEvent("load", this, this.jsonData, o);
207 onLoadException : function(el, o){
208 this.fireEvent("loadexception", this, o);
212 * Filter the data by a specific property.
213 * @param {String} property A property on your JSON objects
214 * @param {String/RegExp} value Either string that the property values
215 * should start with, or a RegExp to test against the property
217 filter : function(property, value){
220 var ss = this.snapshot;
221 if(typeof value == "string"){
222 var vlen = value.length;
227 value = value.toLowerCase();
228 for(var i = 0, len = ss.length; i < len; i++){
230 if(o[property].substr(0, vlen).toLowerCase() == value){
234 } else if(value.exec){ // regex?
235 for(var i = 0, len = ss.length; i < len; i++){
237 if(value.test(o[property])){
244 this.jsonData = data;
250 * Filter by a function. The passed function will be called with each
251 * object in the current dataset. If the function returns true the value is kept,
252 * otherwise it is filtered.
253 * @param {Function} fn
254 * @param {Object} scope (optional) The scope of the function (defaults to this JsonView)
256 filterBy : function(fn, scope){
259 var ss = this.snapshot;
260 for(var i = 0, len = ss.length; i < len; i++){
262 if(fn.call(scope || this, o)){
266 this.jsonData = data;
272 * Clears the current filter.
274 clearFilter : function(){
275 if(this.snapshot && this.jsonData != this.snapshot){
276 this.jsonData = this.snapshot;
283 * Sorts the data for this view and refreshes it.
284 * @param {String} property A property on your JSON objects to sort on
285 * @param {String} direction (optional) "desc" or "asc" (defaults to "asc")
286 * @param {Function} sortType (optional) A function to call to convert the data to a sortable value.
288 sort : function(property, dir, sortType){
289 this.sortInfo = Array.prototype.slice.call(arguments, 0);
292 var dsc = dir && dir.toLowerCase() == "desc";
293 var f = function(o1, o2){
294 var v1 = sortType ? sortType(o1[p]) : o1[p];
295 var v2 = sortType ? sortType(o2[p]) : o2[p];
298 return dsc ? +1 : -1;
300 return dsc ? -1 : +1;
305 this.jsonData.sort(f);
307 if(this.jsonData != this.snapshot){
308 this.snapshot.sort(f);