Products/Plinn/skins/ajax_scripts/plinn_script_loader.js

   1 // (c) Benoît PIN 2006-2015
   2 // http://plinn.org
   3 // Licence GPL
   4 //
   5 //
   6
   7 var ScriptRegistry;
   8 var globalScriptRegistry;
   9
  10 (function() {
  11
  12 function ScriptRegistry() {
  13         this.loadedScripts = {};
  14         this.pendingScripts = [];
  15         this.HEAD = document.getElementsByTagName('head')[0];
  16         this.isLoading = false;
  17 }
  18
  19 ScriptRegistry.prototype.loadScript = function(scriptOb) {
  20         var scriptUrl;
  21         if (typeof(scriptOb) == 'string')
  22                 scriptUrl = scriptOb;
  23         else
  24                 scriptUrl = scriptOb.getAttribute('src');
  25
  26         if (scriptUrl) {
  27                 if (!this.loadedScripts[scriptUrl])
  28                         this.pendingScripts.push(['url', scriptUrl]);
  29         }
  30         else {
  31                 this.pendingScripts.push(['code', scriptOb]);
  32         }
  33         if(!this.isLoading && this.pendingScripts.length)
  34                 this._loadNextScript();
  35 };
  36
  37 ScriptRegistry.prototype._loadNextScript = function() {
  38         var firstScript = this.pendingScripts[0];
  39
  40         switch (firstScript[0]) {
  41                 case 'url':
  42                         var script = document.createElement( "script" );
  43                         script.type     = "text/javascript";
  44                         script.src = firstScript[1];
  45                         this.HEAD.appendChild(script);
  46                         this.loadedScripts[script.src] = true;
  47                         this.isLoading = true;
  48                         var thisRegistry = this;
  49                         if (browser.isIE)
  50                                 script.onreadystatechange = function(){
  51                                         if (script.readyState == 'complete' || script.readyState == 'loaded')
  52                                                 thisRegistry._removeScriptAfterLoad();
  53                                 };
  54                         else
  55                                 script.onload = function(){ thisRegistry._removeScriptAfterLoad(); };
  56                         break;
  57                 case 'code' :
  58                         try {
  59                                 /* jshint ignore:start */
  60                                 eval(firstScript[1].text);
  61                                 /* jshint ignore:end */
  62                         }
  63                         catch(e) {
  64                                 if (window.console) {
  65                                         console.group('Embedded script error');
  66                                         console.error(e);
  67                                         console.info(firstScript[1]);
  68                                         console.groupEnd();
  69                                 }
  70                         }
  71                         this._removeScriptAfterLoad();
  72                         break;
  73         }
  74 };
  75
  76 ScriptRegistry.prototype._removeScriptAfterLoad = function() {
  77         this.pendingScripts.shift();
  78         if(this.pendingScripts.length)
  79                 this._loadNextScript();
  80         else
  81                 this.isLoading = false;
  82 };
  83
  84 globalScriptRegistry = new ScriptRegistry();
  85
  86 }());