skins/ajax_scripts/plinn_script_loader.js

   1 // (c) Benoît PIN 2006-2007
   2 // http://plinn.org
   3 // Licence GPL
   4 // $Id: plinn_script_loader.js 1315 2008-07-29 15:36:15Z pin $
   5 // $URL: http://svn.cri.ensmp.fr/svn/Plinn/branches/CMF-2.1/skins/ajax_scripts/plinn_script_loader.js $
   6
   7
   8 function ScriptRegistry() {
   9         this.loadedScripts = new Object();
  10         this.pendingScripts = new Array();
  11         this.HEAD = document.getElementsByTagName('head')[0];
  12         this.isLoading = false;
  13 }
  14
  15 ScriptRegistry.prototype.loadScript = function(scriptOb) {
  16         var scriptUrl;
  17         if (typeof(scriptOb) == 'string')
  18                 scriptUrl = scriptOb;
  19         else
  20                 scriptUrl = scriptOb.getAttribute('src');
  21
  22         if (scriptUrl) {
  23                 if (!this.loadedScripts[scriptUrl])
  24                         this.pendingScripts.push(['url', scriptUrl]);
  25         }
  26         else {
  27                 this.pendingScripts.push(['code', scriptOb]);
  28         }
  29         if(!this.isLoading && this.pendingScripts.length)
  30                 this._loadNextScript();
  31 }
  32
  33 ScriptRegistry.prototype._loadNextScript = function() {
  34         var firstScript = this.pendingScripts[0];
  35
  36         switch (firstScript[0]) {
  37                 case 'url':
  38                         var script = document.createElement( "script" );
  39                         script.type     = "text/javascript";
  40                         script.src = firstScript[1];
  41                         this.HEAD.appendChild(script);
  42                         this.loadedScripts[script.src] = true;
  43                         this.isLoading = true;
  44                         var thisRegistry = this;
  45                         if (browser.isIE)
  46                                 script.onreadystatechange = function(){
  47                                         if (script.readyState == 'complete' || script.readyState == 'loaded')
  48                                                 thisRegistry._removeScriptAfterLoad();
  49                                 };
  50                         else
  51                                 script.onload = function(){ thisRegistry._removeScriptAfterLoad(); };
  52                         break;
  53                 case 'code' :
  54                         try {
  55                                 eval(firstScript[1].text);
  56                         }
  57                         catch(e) {
  58                                 if (window.console) {
  59                                         console.group('Embedded script error');
  60                                         console.error(e);
  61                                         console.info(firstScript[1]);
  62                                         console.groupEnd();
  63                                 }
  64                         }
  65                         this._removeScriptAfterLoad();
  66                         break;
  67         };
  68 }
  69
  70 ScriptRegistry.prototype._removeScriptAfterLoad = function() {
  71         this.pendingScripts.shift();
  72         if(this.pendingScripts.length)
  73                 this._loadNextScript()
  74         else
  75                 this.isLoading = false;
  76 }
  77
  78 globalScriptRegistry = new ScriptRegistry();