Stores jQuery.ajaxSettings.isLocal locally at load time so that any change to...

Stores jQuery.ajaxSettings.isLocal locally at load time so that any change to it won't affect the transport. Fixes the url parsing regexp to deal with empty domains. Adds informative text into test/localfile.html and handles Opera's failure. Revises the way xhr are created by doing all tests at load time and normalizes all the xhr creation functions so that none of them may throw an exception.

src/ajax.js

@@ -15,7 +15,7 @@ var r20 = /%20/g,
 	rselectTextarea = /^(?:select|textarea)/i,
 	rspacesAjax = /\s+/,
 	rts = /([?&])_=[^&]*/,
-	rurl = /^(\w+:)\/\/([^\/?#:]+)(?::(\d+))?/,
+	rurl = /^(\w+:)\/\/([^\/?#:]*)(?::(\d+))?/,
 
 	// Keep a copy of the old load method
 	_load = jQuery.fn.load,

src/ajax/xhr.js

 (function( jQuery ) {
 
+// Functions to create xhrs
+function createStandardXHR() {
+	try {
+		return new window.XMLHttpRequest();
+	} catch( e ) {}
+}
+
+function createActiveXHR() {
+	try {
+		return new window.ActiveXObject("Microsoft.XMLHTTP");
+	} catch( e ) {}
+}
+
 var // Next active xhr id
 	xhrId = jQuery.now(),
 
@@ -10,7 +23,11 @@ var // Next active xhr id
 	xhrUnloadAbortInstalled,
 
 	// XHR used to determine supports properties
-	testXHR;
+	testXHR,
+
+	// Keep track of isLocal in case it gets removed
+	// from ajaxSettings later on
+	protocolIsLocal = jQuery.ajaxSettings.isLocal;
 
 // Create the request object
 // (This is still attached to ajaxSettings for backward compatibility)
@@ -21,28 +38,17 @@ jQuery.ajaxSettings.xhr = window.ActiveXObject ?
 	 * Additionally XMLHttpRequest can be disabled in IE7/IE8 so
 	 * we need a fallback.
 	 */
-	function() {
-		if ( !jQuery.ajaxSettings.isLocal ) {
-			try {
-				return new window.XMLHttpRequest();
-			} catch( xhrError ) {}
+	( protocolIsLocal ?
+		createActiveXHR :
+		function() {
+			return createStandardXHR() || createActiveXHR();
 		}
-
-		try {
-			return new window.ActiveXObject("Microsoft.XMLHTTP");
-		} catch( activeError ) {}
-	} :
+	) :
 	// For all other browsers, use the standard XMLHttpRequest object
-	function() {
-		return new window.XMLHttpRequest();
-	};
+	createStandardXHR;
 
 // Test if we can create an xhr object
-try {
-	testXHR = jQuery.ajaxSettings.xhr();
-} catch( xhrCreationException ) {}
-
-//Does this browser support XHR requests?
+testXHR = jQuery.ajaxSettings.xhr();
 jQuery.support.ajax = !!testXHR;
 
 // Does this browser support crossDomain XHR requests
@@ -189,13 +195,14 @@ if ( jQuery.support.ajax ) {
 												// for errors, could be anything really (even a real 0)
 												status = 302;
 											}
-										// All same-domain - #8125, #8152: for local files, 0 is a success
-										} else if( s.isLocal ) {
+										// All same-domain: for local files, 0 is a success
+										} else if( protocolIsLocal ) {
 											status = 200;
+											// Opera: this notifies success for all requests
+											// (verified in 11.01). Patch welcome.
 										}
 										// Opera - #6060: sets status as 0 for 304
-										// and there doesn't seem to be any way to
-										// detect this case. Patch VERY welcome.
+										// Patch welcome.
 									}
 								}
 							}

test/localfile.html

@@ -25,16 +25,32 @@
 </head>
 
 <body>
+	<h1>jQuery Local File Test</h1>
+	<ul>
+		<li>
+			Access this file using the "file:" protocol.
+		</li>
+		<li>
+			Two lines must appear below.
+		</li>
+		<li>
+			Opera will fail at detecting errors, it's a known issue.
+		</li>
+	</ul>
 	<script>
-	jQuery.ajax( "data/badjson.js" , {
-		dataType: "text"
-	}).success(function() {
-		$( "<div/>" ).text( "Success OK" ).appendTo( "body" );
-	});
-	jQuery.ajax( "data/doesnotexist.ext" , {
-		dataType: "text"
-	}).error(function() {
-		$( "<div/>" ).text( "Error OK" ).appendTo( "body" );
-	});
+		jQuery.ajax( "data/badjson.js" , {
+			dataType: "text"
+		}).success(function() {
+			jQuery( "<div/>" ).text( "Success OK" ).appendTo( "body" );
+		});
+		jQuery.ajax( "data/doesnotexist.ext" , {
+			dataType: "text"
+		}).error(function() {
+			jQuery( "<div/>" ).text( "Error OK" ).appendTo( "body" );
+		}).success(function() {
+			if ( jQuery.browser.opera ) {
+				jQuery( "<div/>" ).text( "Error Fail (Opera)" ).appendTo( "body" );
+			}
+		});
 	</script>
 </body>
\ No newline at end of file