Fixes #8135. Makes sure any exception thrown by Firefox when trying t…

…o access an XMLHttpRequest property when a network error occured is caught and notified as an error. Added test/networkerror.html to test the behavior.

src/ajax/xhr.js

@@ -115,76 +115,93 @@ if ( jQuery.support.ajax ) {
					// Listener
					callback = function( _, isAbort ) {

						// Was never called and is aborted or complete
						if ( callback && ( isAbort || xhr.readyState === 4 ) ) {

							// Only called once
							callback = 0;

							// Do not keep as active anymore
							if ( handle ) {
								xhr.onreadystatechange = jQuery.noop;
								delete xhrs[ handle ];
							}

							// If it's an abort
							if ( isAbort ) {
								// Abort it manually if needed
								if ( xhr.readyState !== 4 ) {
									xhr.abort();
						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 xhrs[ handle ];
								}
							} else {
								// Get info
								var status = xhr.status,
									statusText,
									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 = "";
								}
								// If it's an abort
								if ( isAbort ) {
									// Abort it manually if needed
									if ( xhr.readyState !== 4 ) {
										xhr.abort();
									}
								} else {
									// Get info
									status = xhr.status;
									responseHeaders = xhr.getAllResponseHeaders();
									responses = {};
									xml = xhr.responseXML;

								// Filter status for non standard behaviors
								status =
									// Most browsers return 0 when it should be 200 for local files
									// Opera returns 0 when it should be 304
									// Webkit returns 0 for failing cross-domain no matter the real status
									!status ?
										// All: for local files, 0 is a success
										( location.protocol === "file:" ? 200 : (
											// Webkit, Firefox: filter out faulty cross-domain requests
											!s.crossDomain || statusText ?
									// 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
									status =
										// Most browsers return 0 when it should be 200 for local files
										// Opera returns 0 when it should be 304
										// Webkit returns 0 for failing cross-domain no matter the real status
										!status ?
											// All: for local files, 0 is a success
											( location.protocol === "file:" ? 200 : (
												// Webkit, Firefox: filter out faulty cross-domain requests
												!s.crossDomain || statusText ?
												(
													// Opera: filter out real aborts #6060
													responseHeaders ?
													304 :
													0
												) :
												// We assume 302 but could be anything cross-domain related
												302
											) ) :
											(
												// Opera: filter out real aborts #6060
												responseHeaders ?
												304 :
												0
											) :
											// We assume 302 but could be anything cross-domain related
											302
										) ) :
										(
											// IE sometimes returns 1223 when it should be 204 (see #1450)
											status == 1223 ?
												204 :
												status
										);

								// Call complete
								complete( status, statusText, responses, responseHeaders );
												// IE sometimes returns 1223 when it should be 204 (see #1450)
												status == 1223 ?
													204 :
													status
											);
								}
							}
						} catch( firefoxAccessException ) {
							if ( !isAbort ) {
								complete( -1, firefoxAccessException );
							}
						}

						// Call complete if needed
						if ( responses ) {
							complete( status, statusText, responses, responseHeaders );
						}
					};

test/networkerror.html

@@ -0,0 +1,101 @@
<!DOCTYPE html>
<html>
<!--
	Test for #8135

	Thanks John Firebaugh for this test page based on his gist
	https://gist.github.com/807090

	Access this page through a web server, then stop said server and click the button.
-->
<head>
	<title>
		jQuery Network Error Test for Firefox
	</title>
	<style>
		div { margin-top: 10px; }
	</style>
	<script src="../src/core.js"></script>
	<script src="../src/support.js"></script>
	<script src="../src/data.js"></script>
	<script src="../src/queue.js"></script>
	<script src="../src/attributes.js"></script>
	<script src="../src/event.js"></script>
	<script src="../src/sizzle/sizzle.js"></script>
	<script src="../src/sizzle-jquery.js"></script>
	<script src="../src/traversing.js"></script>
	<script src="../src/manipulation.js"></script>
	<script src="../src/css.js"></script>
	<script src="../src/ajax.js"></script>
	<script src="../src/ajax/jsonp.js"></script>
	<script src="../src/ajax/script.js"></script>
	<script src="../src/ajax/xhr.js"></script>
	<script src="../src/effects.js"></script>
	<script src="../src/offset.js"></script>
	<script src="../src/dimensions.js"></script>
	<script type="text/javascript">
	$('button').live('click', function () {
		$.ajax({
			url: '/',
			error: function() {
				console.log( "abort", arguments );
			}
		}).abort();
		$.ajax({
			url: '/',
			error: function() {
				console.log( "complete", arguments );
			}
		});
		return false;
	})
	</script>
</head>
<body>
	<h1>
		jQuery Network Error Test for Firefox
	</h1>
	<div>
		This is a test page for
		<a href="http://bugs.jquery.com/ticket/8135">
			#8135
		</a>
		which was reported in Firefox when accessing properties
		of an XMLHttpRequest object after a network error occured.
	</div>
	<div>Take the following steps:</div>
	<ol>
		<li>
			make sure you accessed this page through a web server,
		</li>
		<li>
			stop the web server,
		</li>
		<li>
			open the console,
		</li>
		<li>
			click this
			<button>button</button>
			,
		</li>
		<li>
			wait for both requests to fail.
		</li>
	</ol>
	<div>
		Test passes if you get two log lines:
		<ul>
			<li>
				the first starting with "abort",
			</li>
			<li>
				the second starting with "complete",
			</li>
		</ul>
	</div>
	<div>
		Test fails if the browser notifies an exception.
	</div>
</body>
</html>