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   1  /*
   2   * FCKeditor - The text editor for internet
   3   * Copyright (C) 2003-2005 Frederico Caldeira Knabben
   4   * 
   5   * Licensed under the terms of the GNU Lesser General Public License:
   6   *         http://www.opensource.org/licenses/lgpl-license.php
   7   * 
   8   * For further information visit:
   9   *         http://www.fckeditor.net/
  10   * 
  11   * "Support Open Source software. What about a donation today?"
  12   * 
  13   * File Name: fckscriptloader.js
  14   *     Defines the FCKScriptLoader object that is used to dynamically load
  15   *     scripts in the editor.
  16   * 
  17   * File Authors:
  18   *         Frederico Caldeira Knabben (fredck@fckeditor.net)
  19   */
  20  
  21  // This object is used to download scripts and css files sequentialy.
  22  // A file download is not started until the previous file was not completelly
  23  // downloaded.
  24  var FCKScriptLoader = new Object() ;
  25  FCKScriptLoader.IsLoading = false ;
  26  FCKScriptLoader.Queue = new Array() ;
  27  
  28  // Adds a script or css to the queue.
  29  FCKScriptLoader.AddScript = function( scriptPath )
  30  {
  31      FCKScriptLoader.Queue[ FCKScriptLoader.Queue.length ] = scriptPath ;
  32      
  33      if ( !this.IsLoading )
  34          this.CheckQueue() ;
  35  }
  36  
  37  // Checks the queue to see if there is something to load.
  38  // This function should not be called by code. It's a internal function
  39  // that's called recursively.
  40  FCKScriptLoader.CheckQueue = function() 
  41  {
  42      // Check if the queue is not empty.
  43      if ( this.Queue.length > 0 )
  44      {
  45          this.IsLoading = true ;
  46          
  47          // Get the first item in the queue
  48          var sScriptPath = this.Queue[0] ;
  49          
  50          // Removes the first item from the queue
  51          var oTempArray = new Array() ;
  52          for ( i = 1 ; i < this.Queue.length ; i++ )
  53              oTempArray[ i - 1 ] = this.Queue[ i ] ;
  54          this.Queue = oTempArray ;
  55          
  56          this.LoadFile( sScriptPath ) ;
  57      }
  58      else
  59      {
  60          this.IsLoading = false ;
  61          
  62          // Call the "OnEmpty" event.
  63          if ( this.OnEmpty ) 
  64              this.OnEmpty() ;
  65      }
  66  }
  67  
  68  FCKScriptLoader.LoadFile = function( filePath ) 
  69  {
  70      //window.status = ( 'Loading ' + filePath + '...' ) ;
  71  
  72      // Dynamically load the file (it can be a CSS or a JS)
  73      var e ;
  74      
  75      // If it is a CSS
  76      if ( filePath.lastIndexOf( '.css' ) > 0 )
  77      {
  78          e = document.createElement( 'LINK' ) ;
  79          e.rel    = 'stylesheet' ;
  80          e.type    = 'text/css' ;
  81      }
  82      // It it is a JS
  83      else
  84      {
  85          e = document.createElement( "script" ) ;
  86              e.type    = "text/javascript" ;
  87      }
  88      
  89      // Add the new object to the HEAD.
  90      document.getElementsByTagName("head")[0].appendChild( e ) ; 
  91  
  92      // Start downloading it.
  93      if ( e.tagName == 'LINK' )
  94      {
  95          // IE must wait for the file to be downloaded.
  96          if ( FCKBrowserInfo.IsIE )
  97              e.onload = FCKScriptLoader_OnLoad ;
  98          // Gecko doens't fire any event when the CSS is loaded, so we 
  99          // can't wait for it.
 100          else
 101              FCKScriptLoader.CheckQueue() ;
 102              
 103          e.href = filePath ;
 104      }
 105      else
 106      {
 107          // Gecko fires the "onload" event and IE fires "onreadystatechange"
 108          e.onload = e.onreadystatechange = FCKScriptLoader_OnLoad ;
 109          e.src = filePath ;
 110      }
 111  }
 112  
 113  function FCKScriptLoader_OnLoad()
 114  {
 115      // Gecko doesn't have a "readyState" property
 116      if ( this.tagName == 'LINK' || !this.readyState || this.readyState == 'loaded' )
 117          // Load the next script available in the queue
 118          FCKScriptLoader.CheckQueue() ;
 119  }