3 var // Next active xhr id
10 xhrUnloadAbortInstalled,
12 // XHR used to determine supports properties
15 // Create the request object
16 // (This is still attached to ajaxSettings for backward compatibility)
17 jQuery.ajaxSettings.xhr = window.ActiveXObject ?
18 /* Microsoft failed to properly
19 * implement the XMLHttpRequest in IE7 (can't request local files),
20 * so we use the ActiveXObject when it is available
21 * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
25 if ( window.location.protocol !== "file:" ) {
27 return new window.XMLHttpRequest();
28 } catch( xhrError ) {}
32 return new window.ActiveXObject("Microsoft.XMLHTTP");
33 } catch( activeError ) {}
35 // For all other browsers, use the standard XMLHttpRequest object
37 return new window.XMLHttpRequest();
40 // Test if we can create an xhr object
42 testXHR = jQuery.ajaxSettings.xhr();
43 } catch( xhrCreationException ) {}
45 //Does this browser support XHR requests?
46 jQuery.support.ajax = !!testXHR;
48 // Does this browser support crossDomain XHR requests
49 jQuery.support.cors = testXHR && ( "withCredentials" in testXHR );
51 // No need for the temporary xhr anymore
54 // Create transport if the browser can provide an xhr
55 if ( jQuery.support.ajax ) {
57 jQuery.ajaxTransport(function( s ) {
58 // Cross domain only allowed if supported through XMLHttpRequest
59 if ( !s.crossDomain || jQuery.support.cors ) {
64 send: function( headers, complete ) {
66 // #5280: we need to abort on unload or IE will keep connections alive
67 if ( !xhrUnloadAbortInstalled ) {
69 xhrUnloadAbortInstalled = 1;
71 jQuery(window).bind( "unload", function() {
73 // Abort all pending requests
74 jQuery.each( xhrs, function( _, xhr ) {
75 if ( xhr.onreadystatechange ) {
76 xhr.onreadystatechange( 1 );
88 // Passing null username, generates a login popup on Opera (#2865)
90 xhr.open( s.type, s.url, s.async, s.username, s.password );
92 xhr.open( s.type, s.url, s.async );
95 // Requested-With header
96 // Not set for crossDomain requests with no content
97 // (see why at http://trac.dojotoolkit.org/ticket/9486)
98 // Won't change header if already provided
99 if ( !( s.crossDomain && !s.hasContent ) && !headers["x-requested-with"] ) {
100 headers[ "x-requested-with" ] = "XMLHttpRequest";
103 // Need an extra try/catch for cross domain requests in Firefox 3
105 jQuery.each( headers, function( key, value ) {
106 xhr.setRequestHeader( key, value );
110 // Do send the request
112 xhr.send( ( s.hasContent && s.data ) || null );
114 complete( 0, "error", "" + e );
119 callback = function( _, isAbort ) {
121 // Was never called and is aborted or complete
122 if ( callback && ( isAbort || xhr.readyState === 4 ) ) {
127 // Do not keep as active anymore
129 xhr.onreadystatechange = jQuery.noop;
130 delete xhrs[ handle ];
135 // Abort it manually if needed
136 if ( xhr.readyState !== 4 ) {
141 var status = xhr.status,
143 responseHeaders = xhr.getAllResponseHeaders(),
145 xml = xhr.responseXML;
147 // Construct response list
148 if ( xml && xml.documentElement /* #4958 */ ) {
151 responses.text = xhr.responseText;
153 // Firefox throws an exception when accessing
154 // statusText for faulty cross-domain requests
156 statusText = xhr.statusText;
158 // We normalize with Webkit giving an empty statusText
162 // Filter status for non standard behaviours
164 // Opera returns 0 when it should be 304
165 // Webkit returns 0 for failing cross-domain no matter the real status
168 // Webkit, Firefox: filter out faulty cross-domain requests
169 !s.crossDomain || statusText ?
171 // Opera: filter out real aborts #6060
176 // We assume 302 but could be anything cross-domain related
180 // IE sometimes returns 1223 when it should be 204 (see #1450)
187 complete( status, statusText, responses, responseHeaders );
192 // if we're in sync mode or it's in cache
193 // and has been retrieved directly (IE6 & IE7)
194 // we need to manually fire the callback
195 if ( !s.async || xhr.readyState === 4 ) {
198 // Add to list of active xhrs
200 xhrs[ handle ] = xhr;
201 xhr.onreadystatechange = callback;