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153 lines
3.9 KiB
JavaScript
153 lines
3.9 KiB
JavaScript
/*
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Copyright (c) 2003-2012, CKSource - Frederico Knabben. All rights reserved.
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For licensing, see LICENSE.html or http://ckeditor.com/license
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*/
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/**
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* @fileOverview Defines the {@link CKEDITOR.ajax} object, which holds ajax methods for
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* data loading.
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*/
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(function()
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{
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CKEDITOR.plugins.add( 'ajax',
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{
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requires : [ 'xml' ]
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});
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/**
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* Ajax methods for data loading.
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* @namespace
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* @example
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*/
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CKEDITOR.ajax = (function()
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{
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var createXMLHttpRequest = function()
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{
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// In IE, using the native XMLHttpRequest for local files may throw
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// "Access is Denied" errors.
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if ( !CKEDITOR.env.ie || location.protocol != 'file:' )
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try { return new XMLHttpRequest(); } catch(e) {}
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try { return new ActiveXObject( 'Msxml2.XMLHTTP' ); } catch (e) {}
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try { return new ActiveXObject( 'Microsoft.XMLHTTP' ); } catch (e) {}
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return null;
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};
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var checkStatus = function( xhr )
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{
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// HTTP Status Codes:
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// 2xx : Success
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// 304 : Not Modified
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// 0 : Returned when running locally (file://)
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// 1223 : IE may change 204 to 1223 (see http://dev.jquery.com/ticket/1450)
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return ( xhr.readyState == 4 &&
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( ( xhr.status >= 200 && xhr.status < 300 ) ||
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xhr.status == 304 ||
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xhr.status === 0 ||
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xhr.status == 1223 ) );
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};
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var getResponseText = function( xhr )
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{
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if ( checkStatus( xhr ) )
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return xhr.responseText;
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return null;
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};
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var getResponseXml = function( xhr )
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{
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if ( checkStatus( xhr ) )
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{
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var xml = xhr.responseXML;
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return new CKEDITOR.xml( xml && xml.firstChild ? xml : xhr.responseText );
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}
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return null;
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};
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var load = function( url, callback, getResponseFn )
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{
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var async = !!callback;
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var xhr = createXMLHttpRequest();
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if ( !xhr )
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return null;
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xhr.open( 'GET', url, async );
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if ( async )
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{
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// TODO: perform leak checks on this closure.
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/** @ignore */
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xhr.onreadystatechange = function()
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{
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if ( xhr.readyState == 4 )
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{
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callback( getResponseFn( xhr ) );
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xhr = null;
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}
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};
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}
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xhr.send(null);
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return async ? '' : getResponseFn( xhr );
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};
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return /** @lends CKEDITOR.ajax */ {
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/**
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* Loads data from an URL as plain text.
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* @param {String} url The URL from which load data.
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* @param {Function} [callback] A callback function to be called on
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* data load. If not provided, the data will be loaded
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* synchronously.
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* @returns {String} The loaded data. For asynchronous requests, an
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* empty string. For invalid requests, null.
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* @example
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* // Load data synchronously.
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* var data = CKEDITOR.ajax.load( 'somedata.txt' );
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* alert( data );
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* @example
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* // Load data asynchronously.
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* var data = CKEDITOR.ajax.load( 'somedata.txt', function( data )
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* {
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* alert( data );
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* } );
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*/
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load : function( url, callback )
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{
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return load( url, callback, getResponseText );
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},
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/**
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* Loads data from an URL as XML.
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* @param {String} url The URL from which load data.
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* @param {Function} [callback] A callback function to be called on
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* data load. If not provided, the data will be loaded
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* synchronously.
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* @returns {CKEDITOR.xml} An XML object holding the loaded data. For asynchronous requests, an
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* empty string. For invalid requests, null.
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* @example
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* // Load XML synchronously.
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* var xml = CKEDITOR.ajax.loadXml( 'somedata.xml' );
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* alert( xml.getInnerXml( '//' ) );
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* @example
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* // Load XML asynchronously.
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* var data = CKEDITOR.ajax.loadXml( 'somedata.xml', function( xml )
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* {
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* alert( xml.getInnerXml( '//' ) );
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* } );
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*/
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loadXml : function( url, callback )
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{
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return load( url, callback, getResponseXml );
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}
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};
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})();
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})();
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