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- define([
- "../core",
- "../var/support",
- "../ajax"
- ], function( jQuery, support ) {
- jQuery.ajaxSettings.xhr = function() {
- try {
- return new XMLHttpRequest();
- } catch( e ) {}
- };
- var xhrId = 0,
- xhrCallbacks = {},
- xhrSuccessStatus = {
- // file protocol always yields status code 0, assume 200
- 0: 200,
- // Support: IE9
- // #1450: sometimes IE returns 1223 when it should be 204
- 1223: 204
- },
- xhrSupported = jQuery.ajaxSettings.xhr();
- // Support: IE9
- // Open requests must be manually aborted on unload (#5280)
- // See https://support.microsoft.com/kb/2856746 for more info
- if ( window.attachEvent ) {
- window.attachEvent( "onunload", function() {
- for ( var key in xhrCallbacks ) {
- xhrCallbacks[ key ]();
- }
- });
- }
- support.cors = !!xhrSupported && ( "withCredentials" in xhrSupported );
- support.ajax = xhrSupported = !!xhrSupported;
- jQuery.ajaxTransport(function( options ) {
- var callback;
- // Cross domain only allowed if supported through XMLHttpRequest
- if ( support.cors || xhrSupported && !options.crossDomain ) {
- return {
- send: function( headers, complete ) {
- var i,
- xhr = options.xhr(),
- id = ++xhrId;
- xhr.open( options.type, options.url, options.async, options.username, options.password );
- // Apply custom fields if provided
- if ( options.xhrFields ) {
- for ( i in options.xhrFields ) {
- xhr[ i ] = options.xhrFields[ i ];
- }
- }
- // Override mime type if needed
- if ( options.mimeType && xhr.overrideMimeType ) {
- xhr.overrideMimeType( options.mimeType );
- }
- // X-Requested-With header
- // For cross-domain requests, seeing as conditions for a preflight are
- // akin to a jigsaw puzzle, we simply never set it to be sure.
- // (it can always be set on a per-request basis or even using ajaxSetup)
- // For same-domain requests, won't change header if already provided.
- if ( !options.crossDomain && !headers["X-Requested-With"] ) {
- headers["X-Requested-With"] = "XMLHttpRequest";
- }
- // Set headers
- for ( i in headers ) {
- xhr.setRequestHeader( i, headers[ i ] );
- }
- // Callback
- callback = function( type ) {
- return function() {
- if ( callback ) {
- delete xhrCallbacks[ id ];
- callback = xhr.onload = xhr.onerror = null;
- if ( type === "abort" ) {
- xhr.abort();
- } else if ( type === "error" ) {
- complete(
- // file: protocol always yields status 0; see #8605, #14207
- xhr.status,
- xhr.statusText
- );
- } else {
- complete(
- xhrSuccessStatus[ xhr.status ] || xhr.status,
- xhr.statusText,
- // Support: IE9
- // Accessing binary-data responseText throws an exception
- // (#11426)
- typeof xhr.responseText === "string" ? {
- text: xhr.responseText
- } : undefined,
- xhr.getAllResponseHeaders()
- );
- }
- }
- };
- };
- // Listen to events
- xhr.onload = callback();
- xhr.onerror = callback("error");
- // Create the abort callback
- callback = xhrCallbacks[ id ] = callback("abort");
- try {
- // Do send the request (this may raise an exception)
- xhr.send( options.hasContent && options.data || null );
- } catch ( e ) {
- // #14683: Only rethrow if this hasn't been notified as an error yet
- if ( callback ) {
- throw e;
- }
- }
- },
- abort: function() {
- if ( callback ) {
- callback();
- }
- }
- };
- }
- });
- });
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