JsonView.js
/**
* @class Ext.JsonView
* @extends Ext.View
* Shortcut class to create a JSON + UpdateManager template view. Usage:
<pre><code>
var view = new Ext.JsonView("my-element",
'<div id="{id}">{foo} - {bar}</div>', // 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 Ext.Template(
'<div class="entry">' +
'<a class="entry-title" href="{link}">{title}</a>' +
"<h4>{date} by {author} | {comments} Comments</h4>{description}" +
"</div><hr />"
);
var moreView = new Ext.JsonView("entry-list", tpl, {
jsonRoot: "posts"
});
moreView.on("beforerender", this.sortEntries, this);
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 {Template} tpl The rendering template
* @param {Object} config The config object
*/
Ext.JsonView = function(container, tpl, config){
Ext.JsonView.superclass.constructor.call(this, container, tpl, config);
var um = this.el.getUpdateManager();
um.setRenderer(this);
um.on("update", this.onLoad, this);
um.on("failure", this.onLoadException, this);
/**
* @event beforerender
* Fires before rendering of the downloaded json data.
* @param {Ext.View} this
* @param {Object} data The json data loaded
*/
// holder
/***
* @event load
* Fires when data is loaded.
* @param {Ext.View} this
* @param {Object} data The json data loaded
* @param {Object} response The raw Connect response object
*/
// holder
/***
* @event loadexception
* Fires when loading fails.
* @param {Ext.View} this
* @param {Object} response The raw Connect response object
*/
this.addEvents({
'beforerender' : true,
'load' : true,
'loadexception' : true
});
};
Ext.extend(Ext.JsonView, Ext.View, {
/**
* The root property in the loaded json object that contains the data
* @type {String}
*/
jsonRoot : "",
/**
* Refreshes the view.
*/
refresh : function(){
this.clearSelections();
this.el.update("");
var html = [];
var o = this.jsonData;
if(o && o.length > 0){
for(var i = 0, len = o.length; i < len; i++){
var data = this.prepareData(o[i], i, o);
html[html.length] = this.tpl.apply(data);
}
}else{
html.push(this.emptyText);
}
this.el.update(html.join(""));
this.nodes = this.el.dom.childNodes;
this.updateIndexes(0);
},
/**
* 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 {String/Object} params （可选） The parameters to pass as either a url encoded string "param1=1&param2=2" or an object {param1: 1, param2: 2}
* @param {Function} callback （可选） Callback when transaction is complete - called with signature (oElement, bSuccess)
* @param {Boolean} discardUrl （可选） 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);
},
render : function(el, response){
this.clearSelections();
this.el.update("");
var o;
try{
o = 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();
},
/**
* 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 （可选） 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 （可选） desc or asc (defaults to asc)
* @param {Function} sortType （可选） 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);
}
}
}
});
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