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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.ajax} object, which holds ajax methods for
* data loading.
*/
/**
* @namespace Ajax methods for data loading.
* @example
*/
CKEDITOR.ajax = (function()
{
var createXMLHttpRequest = function()
{
// In IE, using the native XMLHttpRequest for local files may throw
// "Access is Denied" errors.
if ( !CKEDITOR.env.ie || location.protocol != 'file:' )
try { return new XMLHttpRequest(); } catch(e) {}
try { return new ActiveXObject( 'Msxml2.XMLHTTP' ); } catch (e) {}
try { return new ActiveXObject( 'Microsoft.XMLHTTP' ); } catch (e) {}
return null;
};
var checkStatus = function( xhr )
{
// HTTP Status Codes:
// 2xx : Success
// 304 : Not Modified
// 0 : Returned when running locally (file://)
// 1223 : IE may change 204 to 1223 (see http://dev.jquery.com/ticket/1450)
return ( xhr.readyState == 4 &&
( ( xhr.status >= 200 && xhr.status < 300 ) ||
xhr.status == 304 ||
xhr.status === 0 ||
xhr.status == 1223 ) );
};
var getResponseText = function( xhr )
{
if ( checkStatus( xhr ) )
return xhr.responseText;
return null;
};
var getResponseXml = function( xhr )
{
if ( checkStatus( xhr ) )
{
var xml = xhr.responseXML;
return new CKEDITOR.xml( xml && xml.firstChild ? xml : xhr.responseText );
}
return null;
};
var load = function( url, callback, getResponseFn )
{
var async = !!callback;
var xhr = createXMLHttpRequest();
if ( !xhr )
return null;
xhr.open( 'GET', url, async );
if ( async )
{
// TODO: perform leak checks on this closure.
/** @ignore */
xhr.onreadystatechange = function()
{
if ( xhr.readyState == 4 )
{
callback( getResponseFn( xhr ) );
xhr = null;
}
};
}
xhr.send(null);
return async ? '' : getResponseFn( xhr );
};
return /** @lends CKEDITOR.ajax */ {
/**
* Loads data from an URL as plain text.
* @param {String} url The URL from which load data.
* @param {Function} [callback] A callback function to be called on
* data load. If not provided, the data will be loaded
* asynchronously, passing the data value the function on load.
* @returns {String} The loaded data. For asynchronous requests, an
* empty string. For invalid requests, null.
* @example
* // Load data synchronously.
* var data = CKEDITOR.ajax.load( 'somedata.txt' );
* alert( data );
* @example
* // Load data asynchronously.
* var data = CKEDITOR.ajax.load( 'somedata.txt', function( data )
* {
* alert( data );
* } );
*/
load : function( url, callback )
{
return load( url, callback, getResponseText );
},
/**
* Loads data from an URL as XML.
* @param {String} url The URL from which load data.
* @param {Function} [callback] A callback function to be called on
* data load. If not provided, the data will be loaded
* asynchronously, passing the data value the function on load.
* @returns {CKEDITOR.xml} An XML object holding the loaded data. For asynchronous requests, an
* empty string. For invalid requests, null.
* @example
* // Load XML synchronously.
* var xml = CKEDITOR.ajax.loadXml( 'somedata.xml' );
* alert( xml.getInnerXml( '//' ) );
* @example
* // Load XML asynchronously.
* var data = CKEDITOR.ajax.loadXml( 'somedata.xml', function( xml )
* {
* alert( xml.getInnerXml( '//' ) );
* } );
*/
loadXml : function( url, callback )
{
return load( url, callback, getResponseXml );
}
};
})();