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(function( jQuery ) {
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 );
}
// Apply custom fields if provided
if ( s.xhrFields ) {
for ( i in s.xhrFields ) {
xhr[ i ] = s.xhrFields[ i ];
}
}
// Override mime type if needed
if ( s.mimeType && xhr.overrideMimeType ) {
xhr.overrideMimeType( s.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 ( !s.crossDomain && !headers["X-Requested-With"] ) {
headers[ "X-Requested-With" ] = "XMLHttpRequest";
}
// Need an extra try/catch for cross domain requests in Firefox 3
try {
for ( i in headers ) {
xhr.setRequestHeader( headers[ i ].n, headers[ i ].v );
}
} catch( _ ) {}
// Do send the request
// This may raise an exception which is actually
// handled in jQuery.ajax (so no try/catch here)
xhr.send( ( s.hasContent && s.data ) || null );
// Listener
callback = function( _, isAbort ) {
var status,
statusText,
responseHeaders,
responses,
xml;
// Firefox throws exceptions when accessing properties
// of an xhr when a network error occured
// http://helpful.knobs-dials.com/index.php/Component_returned_failure_code:_0x80040111_(NS_ERROR_NOT_AVAILABLE)
try {
// Was never called and is aborted or complete
if ( callback && ( isAbort || xhr.readyState === 4 ) ) {
// Only called once
callback = undefined;
// Do not keep as active anymore
if ( handle ) {
xhr.onreadystatechange = jQuery.noop;
delete xhrCallbacks[ handle ];
}
// If it's an abort
if ( isAbort ) {
// Abort it manually if needed
if ( xhr.readyState !== 4 ) {
xhr.abort();
}
} else {
status = xhr.status;
responseHeaders = xhr.getAllResponseHeaders();
responses = {};
xml = xhr.responseXML;
// Construct response list
if ( xml && xml.documentElement /* #4958 */ ) {
responses.xml = xml;
}
responses.text = xhr.responseText;
// Firefox throws an exception when accessing
// statusText for faulty cross-domain requests
try {
statusText = xhr.statusText;
} catch( e ) {
// We normalize with Webkit giving an empty statusText
statusText = "";
}
// Filter status for non standard behaviors
// If the request is local and we have data: assume a success
// (success with no data won't get notified, that's the best we
// can do given current implementations)
if ( !status && s.isLocal && !s.crossDomain ) {
status = responses.text ? 200 : 404;
// IE - #1450: sometimes returns 1223 when it should be 204
} else if ( status === 1223 ) {
status = 204;
}
}
}
} catch( firefoxAccessException ) {
if ( !isAbort ) {
complete( -1, firefoxAccessException );
}
}
// Call complete if needed
if ( responses ) {
complete( status, statusText, responses, responseHeaders );
}
};
// if we're in sync mode or it's in cache
// and has been retrieved directly (IE6 & IE7)
// we need to manually fire the callback
if ( !s.async || xhr.readyState === 4 ) {
callback();
} else {
// Create the active xhrs callbacks list if needed
// and attach the unload handler
if ( !xhrCallbacks ) {
xhrCallbacks = {};
xhrOnUnloadAbort();
}
// Add to list of active xhrs callbacks
handle = xhrId++;
xhr.onreadystatechange = xhrCallbacks[ handle ] = callback;
}
},
abort: function() {
if ( callback ) {
callback(0,1);
}
}
};
}
});
}
})( jQuery );
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