ckeditor/_source/core/scriptloader.js

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/*
Copyright (c) 2003-2011, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/

/**
 * @fileOverview Defines the {@link CKEDITOR.scriptLoader} object, used to load scripts
 *		asynchronously.
 */

/**
 * Load scripts asynchronously.
 * @namespace
 * @example
 */
CKEDITOR.scriptLoader = (function()
{
	var uniqueScripts = {},
		waitingList = {};

	return /** @lends CKEDITOR.scriptLoader */ {
		/**
		 * Loads one or more external script checking if not already loaded
		 * previously by this function.
		 * @param {String|Array} scriptUrl One or more URLs pointing to the
		 *		scripts to be loaded.
		 * @param {Function} [callback] A function to be called when the script
		 *		is loaded and executed. If a string is passed to "scriptUrl", a
		 *		boolean parameter is passed to the callback, indicating the
		 *		success of the load. If an array is passed instead, two array
		 *		parameters are passed to the callback; the first contains the
		 *		URLs that have been properly loaded, and the second the failed
		 *		ones.
		 * @param {Object} [scope] The scope ("this" reference) to be used for
		 *		the callback call. Default to {@link CKEDITOR}.
		 * @param {Boolean} [showBusy] Changes the cursor of the document while
+		 *		the script is loaded.
		 * @example
		 * CKEDITOR.scriptLoader.load( '/myscript.js' );
		 * @example
		 * CKEDITOR.scriptLoader.load( '/myscript.js', function( success )
		 *     {
		 *         // Alerts "true" if the script has been properly loaded.
		 *         // HTTP error 404 should return "false".
		 *         alert( success );
		 *     });
		 * @example
		 * CKEDITOR.scriptLoader.load( [ '/myscript1.js', '/myscript2.js' ], function( completed, failed )
		 *     {
		 *         alert( 'Number of scripts loaded: ' + completed.length );
		 *         alert( 'Number of failures: ' + failed.length );
		 *     });
		 */
		load : function( scriptUrl, callback, scope, showBusy )
		{
			var isString = ( typeof scriptUrl == 'string' );

			if ( isString )
				scriptUrl = [ scriptUrl ];