Coerce s.url to string before calling replace, since replace is also a method of...
[jquery.git] / src / ajax.js
index 858ac4b..61b9c43 100644 (file)
@@ -1,20 +1,29 @@
-var jsc = now(),
-       rscript = /<script(.|\s)*?\/script>/g,
-       rselectTextarea = /select|textarea/i,
-       rinput = /text|hidden|password|search/i,
-       jsre = /=\?(&|$)/,
+(function( jQuery ) {
+
+var jsc = jQuery.now(),
+       rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
+       rselectTextarea = /^(?:select|textarea)/i,
+       rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
+       rnoContent = /^(?:GET|HEAD)$/,
+       rbracket = /\[\]$/,
+       jsre = /\=\?(&|$)/,
        rquery = /\?/,
-       rts = /(\?|&)_=.*?(&|$)/,
+       rts = /([?&])_=[^&]*/,
        rurl = /^(\w+:)?\/\/([^\/?#]+)/,
-       r20 = /%20/g;
+       r20 = /%20/g,
+       rhash = /#.*$/,
 
-jQuery.fn.extend({
-       // Keep a copy of the old load
-       _load: jQuery.fn.load,
+       // Keep a copy of the old load method
+       _load = jQuery.fn.load;
 
+jQuery.fn.extend({
        load: function( url, params, callback ) {
-               if ( typeof url !== "string" ) {
-                       return this._load( url );
+               if ( typeof url !== "string" && _load ) {
+                       return _load.apply( this, arguments );
+
+               // Don't do a request if no elements are being requested
+               } else if ( !this.length ) {
+                       return this;
                }
 
                var off = url.indexOf(" ");
@@ -36,25 +45,26 @@ jQuery.fn.extend({
 
                        // Otherwise, build a param string
                        } else if ( typeof params === "object" ) {
-                               params = jQuery.param( params );
+                               params = jQuery.param( params, jQuery.ajaxSettings.traditional );
                                type = "POST";
                        }
                }
 
+               var self = this;
+
                // Request the remote document
                jQuery.ajax({
                        url: url,
                        type: type,
                        dataType: "html",
                        data: params,
-                       context:this,
-                       complete: function(res, status){
+                       complete: function( res, status ) {
                                // If successful, inject the HTML into all the matched elements
                                if ( status === "success" || status === "notmodified" ) {
                                        // See if a selector was specified
-                                       this.html( selector ?
+                                       self.html( selector ?
                                                // Create a dummy div to hold the results
-                                               jQuery("<div />")
+                                               jQuery("<div>")
                                                        // inject the contents of the document in, removing the scripts
                                                        // to avoid any 'Permission Denied' errors in IE
                                                        .append(res.responseText.replace(rscript, ""))
@@ -67,7 +77,7 @@ jQuery.fn.extend({
                                }
 
                                if ( callback ) {
-                                       this.each( callback, [res.responseText, status, res] );
+                                       self.each( callback, [res.responseText, status, res] );
                                }
                        }
                });
@@ -78,38 +88,38 @@ jQuery.fn.extend({
        serialize: function() {
                return jQuery.param(this.serializeArray());
        },
+
        serializeArray: function() {
-               return this.map(function(){
+               return this.map(function() {
                        return this.elements ? jQuery.makeArray(this.elements) : this;
                })
-               .filter(function(){
+               .filter(function() {
                        return this.name && !this.disabled &&
                                (this.checked || rselectTextarea.test(this.nodeName) ||
                                        rinput.test(this.type));
                })
-               .map(function(i, elem){
+               .map(function( i, elem ) {
                        var val = jQuery(this).val();
 
                        return val == null ?
                                null :
                                jQuery.isArray(val) ?
-                                       jQuery.map( val, function(val, i){
-                                               return {name: elem.name, value: val};
+                                       jQuery.map( val, function( val, i ) {
+                                               return { name: elem.name, value: val };
                                        }) :
-                                       {name: elem.name, value: val};
+                                       { name: elem.name, value: val };
                }).get();
        }
 });
 
 // Attach a bunch of functions for handling common AJAX events
-jQuery.each( "ajaxStart,ajaxStop,ajaxComplete,ajaxError,ajaxSuccess,ajaxSend".split(","), function(i,o){
-       jQuery.fn[o] = function(f){
+jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".split(" "), function( i, o ) {
+       jQuery.fn[o] = function( f ) {
                return this.bind(o, f);
        };
 });
 
 jQuery.extend({
-
        get: function( url, data, callback, type ) {
                // shift arguments if data argument was omited
                if ( jQuery.isFunction( data ) ) {
@@ -168,14 +178,11 @@ jQuery.extend({
                data: null,
                username: null,
                password: null,
+               traditional: false,
                */
-               // Create the request object; Microsoft failed to properly
-               // implement the XMLHttpRequest in IE7, so we use the ActiveXObject when it is available
                // This function can be overriden by calling jQuery.ajaxSetup
-               xhr: function(){
-                       return window.ActiveXObject ?
-                               new ActiveXObject("Microsoft.XMLHTTP") :
-                               new XMLHttpRequest();
+               xhr: function() {
+                       return new window.XMLHttpRequest();
                },
                accepts: {
                        xml: "application/xml, text/xml",
@@ -187,22 +194,21 @@ jQuery.extend({
                }
        },
 
-       // Last-Modified header cache for next request
-       lastModified: {},
-       etag: {},
+       ajax: function( origSettings ) {
+               var s = jQuery.extend(true, {}, jQuery.ajaxSettings, origSettings),
+                       jsonp, status, data, type = s.type.toUpperCase(), noContent = rnoContent.test(type);
 
-       ajax: function( s ) {
-               // Extend the settings, but re-extend 's' so that it can be
-               // checked again later (in the test suite, specifically)
-               s = jQuery.extend(true, s, jQuery.extend(true, {}, jQuery.ajaxSettings, s));
-               
-               var jsonp, status, data,
-                       callbackContext = s.context || window,
-                       type = s.type.toUpperCase();
+               // toString fixes people passing a window.location or
+               // document.location to $.ajax, which worked in 1.4.2 and
+               // earlier (bug #7531). It should be removed in 1.5.
+               s.url = s.url.toString().replace( rhash, "" );
+
+               // Use original (not extended) context object if it was provided
+               s.context = origSettings && origSettings.context != null ? origSettings.context : s;
 
                // convert data if not already a string
                if ( s.data && s.processData && typeof s.data !== "string" ) {
-                       s.data = jQuery.param(s.data);
+                       s.data = jQuery.param( s.data, s.traditional );
                }
 
                // Handle JSONP Parameter Callbacks
@@ -219,7 +225,7 @@ jQuery.extend({
 
                // Build temporary JSONP function
                if ( s.dataType === "json" && (s.data && jsre.test(s.data) || jsre.test(s.url)) ) {
-                       jsonp = "jsonp" + jsc++;
+                       jsonp = s.jsonpCallback || ("jsonp" + jsc++);
 
                        // Replace the =? sequence both in the query string and the data
                        if ( s.data ) {
@@ -233,13 +239,25 @@ jQuery.extend({
                        s.dataType = "script";
 
                        // Handle JSONP-style loading
-                       window[ jsonp ] = function(tmp){
+                       var customJsonp = window[ jsonp ];
+
+                       window[ jsonp ] = function( tmp ) {
+                               if ( jQuery.isFunction( customJsonp ) ) {
+                                       customJsonp( tmp );
+
+                               } else {
+                                       // Garbage collect
+                                       window[ jsonp ] = undefined;
+
+                                       try {
+                                               delete window[ jsonp ];
+                                       } catch( jsonpError ) {}
+                               }
+
                                data = tmp;
-                               success();
-                               complete();
-                               // Garbage collect
-                               window[ jsonp ] = undefined;
-                               try{ delete window[ jsonp ]; } catch(e){}
+                               jQuery.handleSuccess( s, xhr, status, data );
+                               jQuery.handleComplete( s, xhr, status, data );
+                               
                                if ( head ) {
                                        head.removeChild( script );
                                }
@@ -250,52 +268,51 @@ jQuery.extend({
                        s.cache = false;
                }
 
-               if ( s.cache === false && type === "GET" ) {
-                       var ts = now();
+               if ( s.cache === false && noContent ) {
+                       var ts = jQuery.now();
 
                        // try replacing _= if it is there
-                       var ret = s.url.replace(rts, "$1_=" + ts + "$2");
+                       var ret = s.url.replace(rts, "$1_=" + ts);
 
                        // if nothing was replaced, add timestamp to the end
                        s.url = ret + ((ret === s.url) ? (rquery.test(s.url) ? "&" : "?") + "_=" + ts : "");
                }
 
-               // If data is available, append data to url for get requests
-               if ( s.data && type === "GET" ) {
+               // If data is available, append data to url for GET/HEAD requests
+               if ( s.data && noContent ) {
                        s.url += (rquery.test(s.url) ? "&" : "?") + s.data;
                }
 
                // Watch for a new set of requests
-               if ( s.global && ! jQuery.active++ ) {
+               if ( s.global && jQuery.active++ === 0 ) {
                        jQuery.event.trigger( "ajaxStart" );
                }
 
                // Matches an absolute URL, and saves the domain
-               var parts = rurl.exec( s.url );
+               var parts = rurl.exec( s.url ),
+                       remote = parts && (parts[1] && parts[1].toLowerCase() !== location.protocol || parts[2].toLowerCase() !== location.host);
 
                // If we're requesting a remote document
                // and trying to load JSON or Script with a GET
-               if ( s.dataType === "script" && type === "GET" && parts
-                       && ( parts[1] && parts[1] !== location.protocol || parts[2] !== location.host )) {
-
+               if ( s.dataType === "script" && type === "GET" && remote ) {
                        var head = document.getElementsByTagName("head")[0] || document.documentElement;
                        var script = document.createElement("script");
-                       script.src = s.url;
                        if ( s.scriptCharset ) {
                                script.charset = s.scriptCharset;
                        }
+                       script.src = s.url;
 
                        // Handle Script loading
                        if ( !jsonp ) {
                                var done = false;
 
                                // Attach handlers for all browsers
-                               script.onload = script.onreadystatechange = function(){
+                               script.onload = script.onreadystatechange = function() {
                                        if ( !done && (!this.readyState ||
                                                        this.readyState === "loaded" || this.readyState === "complete") ) {
                                                done = true;
-                                               success();
-                                               complete();
+                                               jQuery.handleSuccess( s, xhr, status, data );
+                                               jQuery.handleComplete( s, xhr, status, data );
 
                                                // Handle memory leak in IE
                                                script.onload = script.onreadystatechange = null;
@@ -319,6 +336,10 @@ jQuery.extend({
                // Create the request object
                var xhr = s.xhr();
 
+               if ( !xhr ) {
+                       return;
+               }
+
                // Open the socket
                // Passing null username, generates a login popup on Opera (#2865)
                if ( s.username ) {
@@ -329,35 +350,38 @@ jQuery.extend({
 
                // Need an extra try/catch for cross domain requests in Firefox 3
                try {
-                       // Set the correct header, if data is being sent
-                       if ( s.data ) {
+                       // Set content-type if data specified and content-body is valid for this type
+                       if ( (s.data != null && !noContent) || (origSettings && origSettings.contentType) ) {
                                xhr.setRequestHeader("Content-Type", s.contentType);
                        }
 
-                               // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
-                               if ( s.ifModified ) {
-                                       if ( jQuery.lastModified[s.url] ) {
-                                               xhr.setRequestHeader("If-Modified-Since", jQuery.lastModified[s.url]);
-                                       }
+                       // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
+                       if ( s.ifModified ) {
+                               if ( jQuery.lastModified[s.url] ) {
+                                       xhr.setRequestHeader("If-Modified-Since", jQuery.lastModified[s.url]);
+                               }
 
-                                       if ( jQuery.etag[s.url] ) {
-                                               xhr.setRequestHeader("If-None-Match", jQuery.etag[s.url]);
-                                       }
+                               if ( jQuery.etag[s.url] ) {
+                                       xhr.setRequestHeader("If-None-Match", jQuery.etag[s.url]);
                                }
+                       }
 
                        // Set header so the called script knows that it's an XMLHttpRequest
-                       xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
+                       // Only send the header if it's not a remote XHR
+                       if ( !remote ) {
+                               xhr.setRequestHeader("X-Requested-With", "XMLHttpRequest");
+                       }
 
                        // Set the Accepts header for the server, depending on the dataType
                        xhr.setRequestHeader("Accept", s.dataType && s.accepts[ s.dataType ] ?
-                               s.accepts[ s.dataType ] + ", */*" :
+                               s.accepts[ s.dataType ] + ", */*; q=0.01" :
                                s.accepts._default );
-               } catch(e){}
+               } catch( headerError ) {}
 
                // Allow custom headers/mimetypes and early abort
-               if ( s.beforeSend && s.beforeSend.call(callbackContext, xhr, s) === false ) {
+               if ( s.beforeSend && s.beforeSend.call(s.context, xhr, s) === false ) {
                        // Handle the global AJAX counter
-                       if ( s.global && ! --jQuery.active ) {
+                       if ( s.global && jQuery.active-- === 1 ) {
                                jQuery.event.trigger( "ajaxStop" );
                        }
 
@@ -367,33 +391,28 @@ jQuery.extend({
                }
 
                if ( s.global ) {
-                       trigger("ajaxSend", [xhr, s]);
+                       jQuery.triggerGlobal( s, "ajaxSend", [xhr, s] );
                }
 
                // Wait for a response to come back
-               var onreadystatechange = function(isTimeout){
-                       // The request was aborted, clear the interval and decrement jQuery.active
-                       if ( !xhr || xhr.readyState === 0 ) {
-                               if ( ival ) {
-                                       // clear poll interval
-                                       clearInterval( ival );
-                                       ival = null;
-
-                                       // Handle the global AJAX counter
-                                       if ( s.global && ! --jQuery.active ) {
-                                               jQuery.event.trigger( "ajaxStop" );
-                                       }
+               var onreadystatechange = xhr.onreadystatechange = function( isTimeout ) {
+                       // The request was aborted
+                       if ( !xhr || xhr.readyState === 0 || isTimeout === "abort" ) {
+                               // Opera doesn't call onreadystatechange before this point
+                               // so we simulate the call
+                               if ( !requestDone ) {
+                                       jQuery.handleComplete( s, xhr, status, data );
+                               }
+
+                               requestDone = true;
+                               if ( xhr ) {
+                                       xhr.onreadystatechange = jQuery.noop;
                                }
 
                        // The transfer is complete and the data is available, or the request timed out
                        } else if ( !requestDone && xhr && (xhr.readyState === 4 || isTimeout === "timeout") ) {
                                requestDone = true;
-
-                               // clear poll interval
-                               if (ival) {
-                                       clearInterval(ival);
-                                       ival = null;
-                               }
+                               xhr.onreadystatechange = jQuery.noop;
 
                                status = isTimeout === "timeout" ?
                                        "timeout" :
@@ -403,13 +422,16 @@ jQuery.extend({
                                                        "notmodified" :
                                                        "success";
 
+                               var errMsg;
+
                                if ( status === "success" ) {
                                        // Watch for, and catch, XML document parse errors
                                        try {
                                                // process the data (runs the xml through httpData regardless of callback)
                                                data = jQuery.httpData( xhr, s.dataType, s );
-                                       } catch(e) {
+                                       } catch( parserError ) {
                                                status = "parsererror";
+                                               errMsg = parserError;
                                        }
                                }
 
@@ -417,16 +439,18 @@ jQuery.extend({
                                if ( status === "success" || status === "notmodified" ) {
                                        // JSONP handles its own success callback
                                        if ( !jsonp ) {
-                                               success();
+                                               jQuery.handleSuccess( s, xhr, status, data );
                                        }
                                } else {
-                                       jQuery.handleError(s, xhr, status);
+                                       jQuery.handleError( s, xhr, status, errMsg );
                                }
 
                                // Fire the complete handlers
-                               complete();
+                               if ( !jsonp ) {
+                                       jQuery.handleComplete( s, xhr, status, data );
+                               }
 
-                               if ( isTimeout ) {
+                               if ( isTimeout === "timeout" ) {
                                        xhr.abort();
                                }
 
@@ -437,26 +461,41 @@ jQuery.extend({
                        }
                };
 
-               if ( s.async ) {
-                       // don't attach the handler to the request, just poll it instead
-                       var ival = setInterval(onreadystatechange, 13);
+               // Override the abort handler, if we can (IE 6 doesn't allow it, but that's OK)
+               // Opera doesn't fire onreadystatechange at all on abort
+               try {
+                       var oldAbort = xhr.abort;
+                       xhr.abort = function() {
+                               if ( xhr ) {
+                                       // oldAbort has no call property in IE7 so
+                                       // just do it this way, which works in all
+                                       // browsers
+                                       Function.prototype.call.call( oldAbort, xhr );
+                               }
 
-                       // Timeout checker
-                       if ( s.timeout > 0 ) {
-                               setTimeout(function(){
-                                       // Check to see if the request is still happening
-                                       if ( xhr && !requestDone ) {
-                                               onreadystatechange( "timeout" );
-                                       }
-                               }, s.timeout);
-                       }
+                               onreadystatechange( "abort" );
+                       };
+               } catch( abortError ) {}
+
+               // Timeout checker
+               if ( s.async && s.timeout > 0 ) {
+                       setTimeout(function() {
+                               // Check to see if the request is still happening
+                               if ( xhr && !requestDone ) {
+                                       onreadystatechange( "timeout" );
+                               }
+                       }, s.timeout);
                }
 
                // Send the data
                try {
-                       xhr.send( type === "POST" || type === "PUT" ? s.data : null );
-               } catch(e) {
-                       jQuery.handleError(s, xhr, null, e);
+                       xhr.send( noContent || s.data == null ? null : s.data );
+
+               } catch( sendError ) {
+                       jQuery.handleError( s, xhr, null, sendError );
+
+                       // Fire the complete handlers
+                       jQuery.handleComplete( s, xhr, status, data );
                }
 
                // firefox 1.5 doesn't fire statechange for sync requests
@@ -464,67 +503,146 @@ jQuery.extend({
                        onreadystatechange();
                }
 
-               function success(){
-                       // If a local callback was specified, fire it and pass it the data
-                       if ( s.success ) {
-                               s.success.call( callbackContext, data, status );
-                       }
+               // return XMLHttpRequest to allow aborting the request etc.
+               return xhr;
+       },
 
-                       // Fire the global callback
-                       if ( s.global ) {
-                               trigger( "ajaxSuccess", [xhr, s] );
+       // Serialize an array of form elements or a set of
+       // key/values into a query string
+       param: function( a, traditional ) {
+               var s = [],
+                       add = function( key, value ) {
+                               // If value is a function, invoke it and return its value
+                               value = jQuery.isFunction(value) ? value() : value;
+                               s[ s.length ] = encodeURIComponent(key) + "=" + encodeURIComponent(value);
+                       };
+               
+               // Set traditional to true for jQuery <= 1.3.2 behavior.
+               if ( traditional === undefined ) {
+                       traditional = jQuery.ajaxSettings.traditional;
+               }
+               
+               // If an array was passed in, assume that it is an array of form elements.
+               if ( jQuery.isArray(a) || a.jquery ) {
+                       // Serialize the form elements
+                       jQuery.each( a, function() {
+                               add( this.name, this.value );
+                       });
+                       
+               } else {
+                       // If traditional, encode the "old" way (the way 1.3.2 or older
+                       // did it), otherwise encode params recursively.
+                       for ( var prefix in a ) {
+                               buildParams( prefix, a[prefix], traditional, add );
                        }
                }
 
-               function complete(){
-                       // Process result
-                       if ( s.complete ) {
-                               s.complete.call( callbackContext, xhr, status);
-                       }
+               // Return the resulting serialization
+               return s.join("&").replace(r20, "+");
+       }
+});
 
-                       // The request was completed
-                       if ( s.global ) {
-                               trigger( "ajaxComplete", [xhr, s] );
+function buildParams( prefix, obj, traditional, add ) {
+       if ( jQuery.isArray(obj) && obj.length ) {
+               // Serialize array item.
+               jQuery.each( obj, function( i, v ) {
+                       if ( traditional || rbracket.test( prefix ) ) {
+                               // Treat each array item as a scalar.
+                               add( prefix, v );
+
+                       } else {
+                               // If array item is non-scalar (array or object), encode its
+                               // numeric index to resolve deserialization ambiguity issues.
+                               // Note that rack (as of 1.0.0) can't currently deserialize
+                               // nested arrays properly, and attempting to do so may cause
+                               // a server error. Possible fixes are to modify rack's
+                               // deserialization algorithm or to provide an option or flag
+                               // to force array serialization to be shallow.
+                               buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
                        }
+               });
+                       
+       } else if ( !traditional && obj != null && typeof obj === "object" ) {
+               if ( jQuery.isEmptyObject( obj ) ) {
+                       add( prefix, "" );
 
-                       // Handle the global AJAX counter
-                       if ( s.global && ! --jQuery.active ) {
-                               jQuery.event.trigger( "ajaxStop" );
-                       }
-               }
-               
-               function trigger(type, args){
-                       (s.context ? jQuery(s.context) : jQuery.event).trigger(type, args);
+               // Serialize object item.
+               } else {
+                       jQuery.each( obj, function( k, v ) {
+                               buildParams( prefix + "[" + k + "]", v, traditional, add );
+                       });
                }
+                                       
+       } else {
+               // Serialize scalar item.
+               add( prefix, obj );
+       }
+}
 
-               // return XMLHttpRequest to allow aborting the request etc.
-               return xhr;
-       },
+// This is still on the jQuery object... for now
+// Want to move this to jQuery.ajax some day
+jQuery.extend({
+
+       // Counter for holding the number of active queries
+       active: 0,
+
+       // Last-Modified header cache for next request
+       lastModified: {},
+       etag: {},
 
        handleError: function( s, xhr, status, e ) {
                // If a local callback was specified, fire it
                if ( s.error ) {
-                       s.error.call( s.context || window, xhr, status, e );
+                       s.error.call( s.context, xhr, status, e );
                }
 
                // Fire the global callback
                if ( s.global ) {
-                       (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );
+                       jQuery.triggerGlobal( s, "ajaxError", [xhr, s, e] );
                }
        },
 
-       // Counter for holding the number of active queries
-       active: 0,
+       handleSuccess: function( s, xhr, status, data ) {
+               // If a local callback was specified, fire it and pass it the data
+               if ( s.success ) {
+                       s.success.call( s.context, data, status, xhr );
+               }
+
+               // Fire the global callback
+               if ( s.global ) {
+                       jQuery.triggerGlobal( s, "ajaxSuccess", [xhr, s] );
+               }
+       },
+
+       handleComplete: function( s, xhr, status ) {
+               // Process result
+               if ( s.complete ) {
+                       s.complete.call( s.context, xhr, status );
+               }
+
+               // The request was completed
+               if ( s.global ) {
+                       jQuery.triggerGlobal( s, "ajaxComplete", [xhr, s] );
+               }
+
+               // Handle the global AJAX counter
+               if ( s.global && jQuery.active-- === 1 ) {
+                       jQuery.event.trigger( "ajaxStop" );
+               }
+       },
+               
+       triggerGlobal: function( s, type, args ) {
+               (s.context && s.context.url == null ? jQuery(s.context) : jQuery.event).trigger(type, args);
+       },
 
        // Determines if an XMLHttpRequest was successful or not
        httpSuccess: function( xhr ) {
                try {
                        // IE error sometimes returns 1223 when it should be 204 so treat it as success, see #1450
                        return !xhr.status && location.protocol === "file:" ||
-                               // Opera returns 0 when status is 304
-                               ( xhr.status >= 200 && xhr.status < 300 ) ||
-                               xhr.status === 304 || xhr.status === 1223 || xhr.status === 0;
-               } catch(e){}
+                               xhr.status >= 200 && xhr.status < 300 ||
+                               xhr.status === 304 || xhr.status === 1223;
+               } catch(e) {}
 
                return false;
        },
@@ -542,17 +660,16 @@ jQuery.extend({
                        jQuery.etag[url] = etag;
                }
 
-               // Opera returns 0 when status is 304
-               return xhr.status === 304 || xhr.status === 0;
+               return xhr.status === 304;
        },
 
        httpData: function( xhr, type, s ) {
-               var ct = xhr.getResponseHeader("content-type"),
-                       xml = type === "xml" || !type && ct && ct.indexOf("xml") >= 0,
+               var ct = xhr.getResponseHeader("content-type") || "",
+                       xml = type === "xml" || !type && ct.indexOf("xml") >= 0,
                        data = xml ? xhr.responseXML : xhr.responseText;
 
                if ( xml && data.documentElement.nodeName === "parsererror" ) {
-                       throw "parsererror";
+                       jQuery.error( "parsererror" );
                }
 
                // Allow a pre-filtering function to sanitize the response
@@ -563,77 +680,43 @@ jQuery.extend({
 
                // The filter can actually parse the response
                if ( typeof data === "string" ) {
+                       // Get the JavaScript object, if JSON is used.
+                       if ( type === "json" || !type && ct.indexOf("json") >= 0 ) {
+                               data = jQuery.parseJSON( data );
 
                        // If the type is "script", eval it in global context
-                       if ( type === "script" ) {
+                       } else if ( type === "script" || !type && ct.indexOf("javascript") >= 0 ) {
                                jQuery.globalEval( data );
                        }
-
-                       // Get the JavaScript object, if JSON is used.
-                       if ( type === "json" ) {
-                               if ( typeof JSON === "object" && JSON.parse ) {
-                                       data = JSON.parse( data );
-                               } else {
-                                       data = (new Function("return " + data))();
-                               }
-                       }
                }
 
                return data;
-       },
+       }
 
-       // Serialize an array of form elements or a set of
-       // key/values into a query string
-       param: function( a ) {
-               var s = [],
-                       param_traditional = jQuery.param.traditional;
-               
-               function add( key, value ){
-                       // If value is a function, invoke it and return its value
-                       value = jQuery.isFunction(value) ? value() : value;
-                       s[ s.length ] = encodeURIComponent(key) + '=' + encodeURIComponent(value);
+});
+
+/*
+ * Create the request object; 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.
+ */
+if ( window.ActiveXObject ) {
+       jQuery.ajaxSettings.xhr = function() {
+               if ( window.location.protocol !== "file:" ) {
+                       try {
+                               return new window.XMLHttpRequest();
+                       } catch(xhrError) {}
                }
-               
-               // If an array was passed in, assume that it is an array
-               // of form elements
-               if ( jQuery.isArray(a) || a.jquery )
-                       // Serialize the form elements
-                       jQuery.each( a, function() {
-                               add( this.name, this.value );
-                       });
-                       
-               else
-                       // Encode parameters from object, recursively. If
-                       // jQuery.param.traditional is set, encode the "old" way
-                       // (the way 1.3.2 or older did it)
-                       jQuery.each( a, function buildParams( prefix, obj ) {
-                               
-                               if ( jQuery.isArray(obj) )
-                                       jQuery.each( obj, function(i,v){
-                                               // Due to rails' limited request param syntax, numeric array
-                                               // indices are not supported. To avoid serialization ambiguity
-                                               // issues, serialized arrays can only contain scalar values. php
-                                               // does not have this issue, but we should go with the lowest
-                                               // common denominator
-                                               add( prefix + ( param_traditional ? "" : "[]" ), v );
-                                       });
-                                       
-                               else if ( typeof obj == "object" )
-                                       if ( param_traditional )
-                                               add( prefix, obj );
-                                               
-                                       else
-                                               jQuery.each( obj, function(k,v){
-                                                       buildParams( prefix ? prefix + "[" + k + "]" : k, v );
-                                               });
-                                       
-                               else
-                                       add( prefix, obj );
-                               
-                       });
 
-               // Return the resulting serialization
-               return s.join("&").replace(r20, "+");
-       }
+               try {
+                       return new window.ActiveXObject("Microsoft.XMLHTTP");
+               } catch(activeError) {}
+       };
+}
 
-});
+// Does this browser support XHR requests?
+jQuery.support.ajax = !!jQuery.ajaxSettings.xhr();
+
+})( jQuery );