xp-dev.com Git - namibia/blob - public/ape-source/Transport/Transport.JSONP.js

   1 APE.Transport.JSONP = new Class({
   2
   3         Implements: APE.Transport.SSE,
   4
   5         initialize: function(ape) {
   6                 this.ape = ape;
   7                 this.requestFailObserver = [];
   8                 this.requests = [];
   9
  10                 //If browser support servent sent event, switch to SSE / JSONP transport  (not yet supported by APE server)
  11                 //if (this.SSESupport) this.ape.options.transport = 3;
  12
  13                 window.parent.onkeyup = function(ev) {
  14                         if (ev.keyCode == 27) {
  15                                 this.cancel();//Escape key
  16                                 if (this.ape.status > 0) {
  17                                         //if (!this.SSESupport)
  18                                         //this.ape.request('CLOSE');
  19                                         this.ape.check();
  20                                 }
  21                         }
  22                 }.bind(this);
  23         },
  24
  25         send: function(queryString, options) {
  26                 //Opera has some trouble with JSONP, so opera use mix of SSE & JSONP
  27                 /*if (this.SSESupport && !this.eventSource) { //SSE not yet supported by APE server
  28                         this.initSSE(queryString, options, this.readSSE.bind(this));
  29                 } else { */
  30                         this.callback = options.requestCallback;
  31
  32                         var request = document.createElement('script');
  33                         request.src = this.ape.serverUri + queryString;
  34                         document.head.appendChild(request);
  35                         this.requests.push(request);
  36                         //Detect timeout
  37                         this.requestFailObserver.push(this.ape.requestFail.delay(this.ape.options.pollTime + 10000, this.ape, [-1, request]));
  38
  39                         if (Browser.Engine.gecko) {
  40                                 //Firefox hack to avoid status bar always show a loading message
  41                                 //Ok this hack is little bit weird but it works!
  42                                 (function() {
  43                                         var tmp = document.createElement('iframe');
  44                                         document.body.appendChild(tmp);
  45                                         document.body.removeChild(tmp);
  46                                 }).delay(200);
  47                         }
  48                 //}
  49         },
  50
  51         clearRequest: function(request) {
  52                 request.parentNode.removeChild(request);
  53                 //Avoid memory leaks
  54                 if (request.clearAttributes) {
  55                         request.clearAttributes();
  56                 } else {
  57                         for (var prop in request) delete request[prop];
  58                 }
  59                 $clear(this.requestFailObserver.shift());
  60         },
  61
  62         readSSE: function(data) {
  63                 this.ape.parseResponse(data, this.callback);
  64                 this.callback = null;
  65         },
  66
  67         read: function(resp) {
  68                 $clear(this.requestFailObserver.shift());
  69                 this.clearRequest(this.requests.shift());
  70                 this.ape.parseResponse(resp, this.callback);
  71                 this.callback = null;
  72         },
  73
  74         cancel: function() {
  75                 if (this.requests.length > 0) {
  76                         this.clearRequest(this.requests.shift());
  77                 }
  78         },
  79
  80         running: function() {
  81                 /* if (this.SSESupport) {
  82                         return this.eventSource ? true : false;
  83                 } else { */
  84                         return this.requests.length > 0 ? true : false;
  85                 //}
  86         }
  87
  88
  89 });
  90
  91 APE.Transport.JSONP.browserSupport = function() { return true };