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/* global ActiveXObject */
/**
* @license Copyright (c) 2003-2016, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.md or http://ckeditor.com/license
*/
/**
* @fileOverview Defines the {@link CKEDITOR.ajax} object, which stores Ajax methods for
* data loading.
*/
( function() {
CKEDITOR.plugins.add( 'ajax', {
requires: 'xml'
} );
/**
* Ajax methods for data loading.
*
* @class
* @singleton
*/
CKEDITOR.ajax = ( function() {
function createXMLHttpRequest() {
// 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;
}
function checkStatus( 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 ) );
}
function getResponseText( xhr ) {
if ( checkStatus( xhr ) )
return xhr.responseText;
return null;
}
function getResponseXml( xhr ) {
if ( checkStatus( xhr ) ) {
var xml = xhr.responseXML;
return new CKEDITOR.xml( xml && xml.firstChild ? xml : xhr.responseText );
}
return null;
}
function load( 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.
xhr.onreadystatechange = function() {
if ( xhr.readyState == 4 ) {
callback( getResponseFn( xhr ) );
xhr = null;
}
};
}
xhr.send( null );
return async ? '' : getResponseFn( xhr );
}
function post( url, data, contentType, callback, getResponseFn ) {
var xhr = createXMLHttpRequest();
if ( !xhr )
return null;
xhr.open( 'POST', url, true );
xhr.onreadystatechange = function() {
if ( xhr.readyState == 4 ) {
callback( getResponseFn( xhr ) );
xhr = null;
}
};
xhr.setRequestHeader( 'Content-type', contentType || 'application/x-www-form-urlencoded; charset=UTF-8' );
xhr.send( data );
}
return {
/**
* Loads data from a URL as plain text.
*
* // Load data synchronously.
* var data = CKEDITOR.ajax.load( 'somedata.txt' );
* alert( data );
*
* // Load data asynchronously.
* var data = CKEDITOR.ajax.load( 'somedata.txt', function( data ) {
* alert( data );
* } );
*
* @param {String} url The URL from which the data is loaded.
* @param {Function} [callback] A callback function to be called on
* data load. If not provided, the data will be loaded
* synchronously.
* @returns {String} The loaded data. For asynchronous requests, an
* empty string. For invalid requests, `null`.
*/
load: function( url, callback ) {
return load( url, callback, getResponseText );
},
/**
* Creates an asynchronous POST `XMLHttpRequest` of the given `url`, `data` and optional `contentType`.
* Once the request is done, regardless if it is successful or not, the `callback` is called
* with `XMLHttpRequest#responseText` or `null` as an argument.
*
* CKEDITOR.ajax.post( 'url/post.php', 'foo=bar', null, function( data ) {
* console.log( data );
* } );
*
* CKEDITOR.ajax.post( 'url/post.php', JSON.stringify( { foo: 'bar' } ), 'application/json', function( data ) {
* console.log( data );
* } );
*
* @since 4.4
* @param {String} url The URL of the request.
* @param {String/Object/Array} data Data passed to `XMLHttpRequest#send`.
* @param {String} [contentType='application/x-www-form-urlencoded; charset=UTF-8'] The value of the `Content-type` header.
* @param {Function} callback A callback executed asynchronously with `XMLHttpRequest#responseText` or `null` as an argument,
* depending on the `status` of the request.
*/
post: function( url, data, contentType, callback ) {
return post( url, data, contentType, callback, getResponseText );
},
/**
* Loads data from a URL as XML.
*
* // Load XML synchronously.
* var xml = CKEDITOR.ajax.loadXml( 'somedata.xml' );
* alert( xml.getInnerXml( '//' ) );
*
* // Load XML asynchronously.
* var data = CKEDITOR.ajax.loadXml( 'somedata.xml', function( xml ) {
* alert( xml.getInnerXml( '//' ) );
* } );
*
* @param {String} url The URL from which the data is loaded.
* @param {Function} [callback] A callback function to be called on
* data load. If not provided, the data will be loaded synchronously.
* @returns {CKEDITOR.xml} An XML object storing the loaded data. For asynchronous requests, an
* empty string. For invalid requests, `null`.
*/
loadXml: function( url, callback ) {
return load( url, callback, getResponseXml );
}
};
} )();
} )();
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