-var // Next fake timer id
- xhrPollingId = jQuery.now(),
-
- // Callbacks hashtable
- xhrs = {},
-
- // XHR pool
- xhrPool = [],
-
- // #5280: see end of file
- xhrUnloadAbortMarker;
-
-
-jQuery.ajax.transport( function( s , determineDataType ) {
-
- // Cross domain only allowed if supported through XMLHttpRequest
- if ( ! s.crossDomain || jQuery.support.cors ) {
-
- var callback;
-
- return {
-
- send: function(headers, complete) {
-
- // #5280: we need to abort on unload or IE will keep connections alive
- if ( ! xhrUnloadAbortMarker ) {
-
- xhrUnloadAbortMarker = [];
-
- jQuery(window).bind( "unload" , function() {
-
- // Abort all pending requests
- jQuery.each(xhrs, function(_, xhr) {
- if ( xhr.onreadystatechange ) {
- xhr.onreadystatechange( xhrUnloadAbortMarker );
- }
- });
-
- // Reset polling structure to be safe
- xhrs = {};
-
- });
- }
-
- var xhr = xhrPool.pop() || s.xhr(),
- handle;
-
- // Open the socket
- // Passing null username, generates a login popup on Opera (#2865)
- if ( s.username ) {
- xhr.open(s.type, s.url, s.async, s.username, s.password);
- } else {
- xhr.open(s.type, s.url, s.async);
- }
-
- // Requested-With header
- // Not set for crossDomain requests with no content
- // (see why at http://trac.dojotoolkit.org/ticket/9486)
- // Won't change header if already provided in beforeSend
- if ( ! ( s.crossDomain && ! s.hasContent ) && ! headers["x-requested-with"] ) {
- headers["x-requested-with"] = "XMLHttpRequest";
- }
-
- // Need an extra try/catch for cross domain requests in Firefox 3
- try {
-
- jQuery.each(headers, function(key,value) {
- xhr.setRequestHeader(key,value);
- });
-
- } catch(_) {}
-
- // Do send the request
- try {
- xhr.send( ( s.hasContent && s.data ) || null );
- } catch(e) {
- // Store back in pool
- xhrPool.push( xhr );
- complete(0, "error", "" + e);
- return;
- }
-
- // Listener
- callback = function ( abortStatusText ) {
-
- // Was never called and is aborted or complete
- if ( callback && ( abortStatusText || xhr.readyState === 4 ) ) {
+var // #5280: next active xhr id and list of active xhrs' callbacks
+ xhrId = jQuery.now(),
+ xhrCallbacks,
+
+ // XHR used to determine supports properties
+ testXHR;
+
+// #5280: Internet Explorer will keep connections alive if we don't abort on unload
+function xhrOnUnloadAbort() {
+ jQuery( window ).unload(function() {
+ // Abort all pending requests
+ for ( var key in xhrCallbacks ) {
+ xhrCallbacks[ key ]( 0, 1 );
+ }
+ });
+}
+
+// Functions to create xhrs
+function createStandardXHR() {
+ try {
+ return new window.XMLHttpRequest();
+ } catch( e ) {}
+}
+
+function createActiveXHR() {
+ try {
+ return new window.ActiveXObject("Microsoft.XMLHTTP");
+ } catch( e ) {}
+}
+
+// Create the request object
+// (This is still attached to ajaxSettings for backward compatibility)
+jQuery.ajaxSettings.xhr = window.ActiveXObject ?
+ /* Microsoft failed to properly
+ * implement the XMLHttpRequest in IE7 (can't request local files),
+ * so we use the ActiveXObject when it is available
+ * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
+ * we need a fallback.
+ */
+ function() {
+ return !this.isLocal && createStandardXHR() || createActiveXHR();
+ } :
+ // For all other browsers, use the standard XMLHttpRequest object
+ createStandardXHR;
+
+// Test if we can create an xhr object
+testXHR = jQuery.ajaxSettings.xhr();
+jQuery.support.ajax = !!testXHR;
+
+// Does this browser support crossDomain XHR requests
+jQuery.support.cors = testXHR && ( "withCredentials" in testXHR );
+
+// No need for the temporary xhr anymore
+testXHR = undefined;
+
+// Create transport if the browser can provide an xhr
+if ( jQuery.support.ajax ) {
+
+ jQuery.ajaxTransport(function( s ) {
+ // Cross domain only allowed if supported through XMLHttpRequest
+ if ( !s.crossDomain || jQuery.support.cors ) {
+
+ var callback;
+
+ return {
+ send: function( headers, complete ) {
+
+ // Get a new xhr
+ var xhr = s.xhr(),
+ handle,
+ i;
+
+ // Open the socket
+ // Passing null username, generates a login popup on Opera (#2865)
+ if ( s.username ) {
+ xhr.open( s.type, s.url, s.async, s.username, s.password );
+ } else {
+ xhr.open( s.type, s.url, s.async );
+ }