- xhrUnloadAbortInstalled;
-
-
-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 ( ! xhrUnloadAbortInstalled ) {
-
- xhrUnloadAbortInstalled = 1;
-
- jQuery(window).bind( "unload" , function() {
-
- // Abort all pending requests
- jQuery.each(xhrs, function(_, xhr) {
- if ( xhr.onreadystatechange ) {
- xhr.onreadystatechange( 1 );
- }
- });
-
- });
- }
-
- // Get a new xhr
- 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);
- }
+ xhrUnloadAbortInstalled,
+
+ // XHR used to determine supports properties
+ testXHR;
+
+// 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() {
+ if ( window.location.protocol !== "file:" ) {
+ try {
+ return new window.XMLHttpRequest();
+ } catch( xhrError ) {}
+ }
+
+ try {
+ return new window.ActiveXObject("Microsoft.XMLHTTP");
+ } catch( activeError ) {}
+ } :
+ // For all other browsers, use the standard XMLHttpRequest object
+ function() {
+ return new window.XMLHttpRequest();
+ };
+
+// Test if we can create an xhr object
+try {
+ testXHR = jQuery.ajaxSettings.xhr();
+} catch( xhrCreationException ) {}
+
+//Does this browser support XHR requests?
+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 ) {
+
+ // #5280: we need to abort on unload or IE will keep connections alive
+ if ( !xhrUnloadAbortInstalled ) {
+
+ xhrUnloadAbortInstalled = 1;
+
+ jQuery(window).bind( "unload", function() {
+
+ // Abort all pending requests
+ jQuery.each( xhrs, function( _, xhr ) {
+ if ( xhr.onreadystatechange ) {
+ xhr.onreadystatechange( 1 );
+ }
+ } );
+
+ } );
+ }