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 ) {
56 jQuery.ajaxTransport( function( s ) {
58 // Cross domain only allowed if supported through XMLHttpRequest
59 if ( ! s.crossDomain || jQuery.support.cors ) {
65 send: function(headers, complete) {
67 // #5280: we need to abort on unload or IE will keep connections alive
68 if ( ! xhrUnloadAbortInstalled ) {
70 xhrUnloadAbortInstalled = 1;
72 jQuery(window).bind( "unload" , function() {
74 // Abort all pending requests
75 jQuery.each(xhrs, function(_, xhr) {
76 if ( xhr.onreadystatechange ) {
77 xhr.onreadystatechange( 1 );
89 // Passing null username, generates a login popup on Opera (#2865)
91 xhr.open(s.type, s.url, s.async, s.username, s.password);
93 xhr.open(s.type, s.url, s.async);
96 // Requested-With header
97 // Not set for crossDomain requests with no content
98 // (see why at http://trac.dojotoolkit.org/ticket/9486)
99 // Won't change header if already provided
100 if ( ! ( s.crossDomain && ! s.hasContent ) && ! headers["x-requested-with"] ) {
101 headers["x-requested-with"] = "XMLHttpRequest";
104 // Need an extra try/catch for cross domain requests in Firefox 3
107 jQuery.each(headers, function(key,value) {
108 xhr.setRequestHeader(key,value);
113 // Do send the request
115 xhr.send( ( s.hasContent && s.data ) || null );
117 complete(0, "error", "" + e);
122 callback = function( _ , isAbort ) {
124 // Was never called and is aborted or complete
125 if ( callback && ( isAbort || xhr.readyState === 4 ) ) {
130 // Do not keep as active anymore
132 xhr.onreadystatechange = jQuery.noop;
133 delete xhrs[ handle ];
139 // Abort it manually if needed
140 if ( xhr.readyState !== 4 ) {
146 var status = xhr.status,
148 responseHeaders = xhr.getAllResponseHeaders(),
150 xml = xhr.responseXML;
152 // Construct response list
153 if ( xml && xml.documentElement /* #4958 */ ) {
156 responses.text = xhr.responseText;
158 try { // Firefox throws an exception when accessing statusText for faulty cross-domain requests
160 statusText = xhr.statusText;
164 statusText = ""; // We normalize with Webkit giving an empty statusText
168 // Filter status for non standard behaviours
169 // (so many they seem to be the actual "standard")
171 // Opera returns 0 when it should be 304
172 // Webkit returns 0 for failing cross-domain no matter the real status
175 ! s.crossDomain || statusText ? // Webkit, Firefox: filter out faulty cross-domain requests
177 responseHeaders ? // Opera: filter out real aborts #6060
183 302 // We assume 302 but could be anything cross-domain related
187 status == 1223 ? // IE sometimes returns 1223 when it should be 204 (see #1450)
194 complete(status,statusText,responses,responseHeaders);
199 // if we're in sync mode
200 // or it's in cache and has been retrieved directly (IE6 & IE7)
201 // we need to manually fire the callback
202 if ( ! s.async || xhr.readyState === 4 ) {
208 // Add to list of active xhrs
210 xhrs[ handle ] = xhr;
211 xhr.onreadystatechange = callback;