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/*
Copyright (c) 2003-2012, 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 ];
if ( !scope )
scope = CKEDITOR;
var scriptCount = scriptUrl.length,
completed = [],
failed = [];
var doCallback = function( success )
{
if ( callback )
{
if ( isString )
callback.call( scope, success );
else
callback.call( scope, completed, failed );
}
};
if ( scriptCount === 0 )
{
doCallback( true );
return;
}
var checkLoaded = function( url, success )
{
( success ? completed : failed ).push( url );
if ( --scriptCount <= 0 )
{
showBusy && CKEDITOR.document.getDocumentElement().removeStyle( 'cursor' );
doCallback( success );
}
};
var onLoad = function( url, success )
{
// Mark this script as loaded.
uniqueScripts[ url ] = 1;
// Get the list of callback checks waiting for this file.
var waitingInfo = waitingList[ url ];
delete waitingList[ url ];
// Check all callbacks waiting for this file.
for ( var i = 0 ; i < waitingInfo.length ; i++ )
waitingInfo[ i ]( url, success );
};
var loadScript = function( url )
{
if ( uniqueScripts[ url ] )
{
checkLoaded( url, true );
return;
}
var waitingInfo = waitingList[ url ] || ( waitingList[ url ] = [] );
waitingInfo.push( checkLoaded );
// Load it only for the first request.
if ( waitingInfo.length > 1 )
return;
// Create the <script> element.
var script = new CKEDITOR.dom.element( 'script' );
script.setAttributes( {
type : 'text/javascript',
src : url } );
if ( callback )
{
if ( CKEDITOR.env.ie )
{
// FIXME: For IE, we are not able to return false on error (like 404).
/** @ignore */
script.$.onreadystatechange = function ()
{
if ( script.$.readyState == 'loaded' || script.$.readyState == 'complete' )
{
script.$.onreadystatechange = null;
onLoad( url, true );
}
};
}
else
{
/** @ignore */
script.$.onload = function()
{
// Some browsers, such as Safari, may call the onLoad function
// immediately. Which will break the loading sequence. (#3661)
setTimeout( function() { onLoad( url, true ); }, 0 );
};
// FIXME: Opera and Safari will not fire onerror.
/** @ignore */
script.$.onerror = function()
{
onLoad( url, false );
};
}
}
// Append it to <head>.
script.appendTo( CKEDITOR.document.getHead() );
CKEDITOR.fire( 'download', url ); // @Packager.RemoveLine
};
showBusy && CKEDITOR.document.getDocumentElement().setStyle( 'cursor', 'wait' );
for ( var i = 0 ; i < scriptCount ; i++ )
{
loadScript( scriptUrl[ i ] );
}
}
};
})();
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