src/ext-core/examples/jsonp/jsonp.js

   1 /*!
   2  * Ext JS Library 3.2.2
   3  * Copyright(c) 2006-2010 Ext JS, Inc.
   4  * licensing@extjs.com
   5  * http://www.extjs.com/license
   6  */
   7 Ext.ns('Ext.ux');
   8
   9 Ext.ux.JSONP = (function(){
  10     var _queue = [],
  11         _current = null,
  12         _nextRequest = function() {
  13             _current = null;
  14             if(_queue.length) {
  15                 _current = _queue.shift();
  16                         _current.script.src = _current.url + '?' + _current.params;
  17                         document.getElementsByTagName('head')[0].appendChild(_current.script);
  18             }
  19         };
  20
  21     return {
  22         request: function(url, o) {
  23             if(!url) {
  24                 return;
  25             }
  26             var me = this;
  27
  28             o.params = o.params || {};
  29             if(o.callbackKey) {
  30                 o.params[o.callbackKey] = 'Ext.ux.JSONP.callback';
  31             }
  32             var params = Ext.urlEncode(o.params);
  33
  34             var script = document.createElement('script');
  35                         script.type = 'text/javascript';
  36
  37             if(o.isRawJSON) {
  38                 if(Ext.isIE) {
  39                     Ext.fly(script).on('readystatechange', function() {
  40                         if(script.readyState == 'complete') {
  41                             var data = script.innerHTML;
  42                             if(data.length) {
  43                                 me.callback(Ext.decode(data));
  44                             }
  45                         }
  46                     });
  47                 }
  48                 else {
  49                      Ext.fly(script).on('load', function() {
  50                         var data = script.innerHTML;
  51                         if(data.length) {
  52                             me.callback(Ext.decode(data));
  53                         }
  54                     });
  55                 }
  56             }
  57
  58             _queue.push({
  59                 url: url,
  60                 script: script,
  61                 callback: o.callback || function(){},
  62                 scope: o.scope || window,
  63                 params: params || null
  64             });
  65
  66             if(!_current) {
  67                 _nextRequest();
  68             }
  69         },
  70
  71         callback: function(json) {
  72             _current.callback.apply(_current.scope, [json]);
  73             Ext.fly(_current.script).removeAllListeners();
  74             document.getElementsByTagName('head')[0].removeChild(_current.script);
  75             _nextRequest();
  76         }
  77     }
  78 })();