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jQuery.ajaxSettings.xhr = function() {
try {
return new XMLHttpRequest();
} catch( e ) {}
};
var xhrSupported = jQuery.ajaxSettings.xhr(),
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
};
jQuery.support.cors = !!xhrSupported && ( "withCredentials" in xhrSupported );
jQuery.support.ajax = xhrSupported = !!xhrSupported;
jQuery.ajaxTransport(function( options ) {
var callback;
// Cross domain only allowed if supported through XMLHttpRequest
if ( jQuery.support.cors || xhrSupported && !options.crossDomain ) {
return {
send: function( headers, complete ) {
var i,
xhr = options.xhr();
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 ) {
callback = xhr.onload = xhr.onerror = null;
if ( type === "abort" ) {
xhr.abort();
} else if ( type === "error" ) {
complete(
// file protocol always yields status 0, assume 404
xhr.status || 404,
xhr.statusText
);
} else {
complete(
xhrSuccessStatus[ xhr.status ] || xhr.status,
xhr.statusText,
// Support: IE9
// #11426: When requesting binary data, IE9 will throw an exception
// on any attempt to access responseText
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 = callback("abort");
// Do send the request
// This may raise an exception which is actually
// handled in jQuery.ajax (so no try/catch here)
xhr.send( options.hasContent && options.data || null );
},
abort: function() {
if ( callback ) {
callback();
}
}
};
}
});
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