Make sure prefilters have been called and transport has been selected before sending...
[jquery.git] / src / ajax.js
index 754de09..e910aa5 100644 (file)
@@ -1,20 +1,27 @@
-var jsc = now(),
-       rscript = /<script(.|\s)*?\/script>/gi,
-       rselectTextarea = /select|textarea/i,
-       rinput = /color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week/i,
-       jsre = /=\?(&|$)/,
+(function( jQuery ) {
+
+var r20 = /%20/g,
+       rbracket = /\[\]$/,
+       rhash = /#.*$/,
+       rheaders = /^(.*?):\s*(.*?)\r?$/mg, // IE leaves an \r character at EOL
+       rinput = /^(?:color|date|datetime|email|hidden|month|number|password|range|search|tel|text|time|url|week)$/i,
+       rnoContent = /^(?:GET|HEAD)$/,
        rquery = /\?/,
-       rts = /(\?|&)_=.*?(&|$)/,
-       rurl = /^(\w+:)?\/\/([^\/?#]+)/,
-       r20 = /%20/g;
+       rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
+       rselectTextarea = /^(?:select|textarea)/i,
+       rts = /([?&])_=[^&]*/,
+       rurl = /^(\w+:)?\/\/([^\/?#:]+)(?::(\d+))?/,
 
-jQuery.fn.extend({
-       // Keep a copy of the old load
-       _load: jQuery.fn.load,
+       // Slice function
+       sliceFunc = Array.prototype.slice,
+
+       // 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 ) {
@@ -59,7 +66,7 @@ jQuery.fn.extend({
                                        // See if a selector was specified
                                        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, ""))
@@ -83,39 +90,39 @@ 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.replace(/\r?\n/g, "\r\n")};
                                        }) :
-                                       { name: elem.name, value: val };
+                                       {name: elem.name, value: val.replace(/\r?\n/g, "\r\n")};
                }).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 ) {
+jQuery.each( [ "get", "post" ], function( i, method ) {
+       jQuery[ method ] = function( url, data, callback, type ) {
                // shift arguments if data argument was omited
                if ( jQuery.isFunction( data ) ) {
                        type = type || callback;
@@ -124,13 +131,16 @@ jQuery.extend({
                }
 
                return jQuery.ajax({
-                       type: "GET",
+                       type: method,
                        url: url,
                        data: data,
                        success: callback,
                        dataType: type
                });
-       },
+       };
+});
+
+jQuery.extend({
 
        getScript: function( url, callback ) {
                return jQuery.get(url, null, callback, "script");
@@ -140,23 +150,6 @@ jQuery.extend({
                return jQuery.get(url, data, callback, "json");
        },
 
-       post: function( url, data, callback, type ) {
-               // shift arguments if data argument was omited
-               if ( jQuery.isFunction( data ) ) {
-                       type = type || callback;
-                       callback = data;
-                       data = {};
-               }
-
-               return jQuery.ajax({
-                       type: "POST",
-                       url: url,
-                       data: data,
-                       success: callback,
-                       dataType: type
-               });
-       },
-
        ajaxSetup: function( settings ) {
                jQuery.extend( jQuery.ajaxSettings, settings );
        },
@@ -171,497 +164,766 @@ jQuery.extend({
                /*
                timeout: 0,
                data: null,
+               dataType: null,
+               dataTypes: null,
                username: null,
                password: null,
+               cache: null,
                traditional: false,
                */
-               // 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
-               // This function can be overriden by calling jQuery.ajaxSetup
-               xhr: window.XMLHttpRequest && (window.location.protocol !== "file:" || !window.ActiveXObject) ?
-                       function() {
-                               return new window.XMLHttpRequest();
-                       } :
-                       function() {
-                               try {
-                                       return new window.ActiveXObject("Microsoft.XMLHTTP");
-                               } catch(e) {}
-                       },
+               xhr: function() {
+                       return new window.XMLHttpRequest();
+               },
+
                accepts: {
                        xml: "application/xml, text/xml",
                        html: "text/html",
-                       script: "text/javascript, application/javascript",
-                       json: "application/json, text/javascript",
                        text: "text/plain",
-                       _default: "*/*"
+                       json: "application/json, text/javascript",
+                       "*": "*/*"
+               },
+
+               contents: {
+                       xml: /xml/,
+                       html: /html/,
+                       json: /json/
+               },
+
+               // Prefilters
+               // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
+               // 2) These are called:
+               //    * BEFORE asking for a transport
+               //    * AFTER param serialization (s.data is a string if s.processData is true)
+               // 3) key is the dataType
+               // 4) the catchall symbol "*" can be used
+               // 5) execution will start with transport dataType and THEN continue down to "*" if needed
+               prefilters: {},
+
+               // Transports bindings
+               // 1) key is the dataType
+               // 2) the catchall symbol "*" can be used
+               // 3) selection will start with transport dataType and THEN go to "*" if needed
+               transports: {},
+
+               // List of data converters
+               // 1) key format is "source_type destination_type" (a single space in-between)
+               // 2) the catchall symbol "*" can be used for source_type
+               converters: {
+
+                       // Convert anything to text
+                       "* text": window.String,
+
+                       // Text to html (true = no transformation)
+                       "text html": true,
+
+                       // Evaluate text as a json expression
+                       "text json": jQuery.parseJSON,
+
+                       // Parse text as xml
+                       "text xml": jQuery.parseXML
                }
        },
 
-       // Last-Modified header cache for next request
-       lastModified: {},
-       etag: {},
+       // Main method
+       // (s is used internally)
+       ajax: function( url , options , s ) {
 
-       ajax: function( origSettings ) {
-               var s = jQuery.extend(true, {}, jQuery.ajaxSettings, origSettings);
-               
-               var jsonp, status, data,
+               // Handle varargs
+               if ( arguments.length === 1 ) {
+                       options = url;
+                       url = options ? options.url : undefined;
+               }
+
+               // Force options to be an object
+               options = options || {};
+
+               // Get the url if provided separately
+               options.url = url || options.url;
+
+               // Create the final options object
+               s = jQuery.extend( true , {} , jQuery.ajaxSettings , options );
+
+               // We force the original context
+               // (plain objects used as context get extended)
+               s.context = options.context;
+
+               var // jQuery lists
+                       jQuery_lastModified = jQuery.lastModified,
+                       jQuery_etag = jQuery.etag,
+                       // Callbacks contexts
                        callbackContext = s.context || s,
-                       type = s.type.toUpperCase();
+                       globalEventContext = s.context ? jQuery( s.context ) : jQuery.event,
+                       // Deferreds
+                       deferred = jQuery.Deferred(),
+                       completeDeferred = jQuery._Deferred(),
+                       // Headers (they are sent all at once)
+                       requestHeaders = {},
+                       // Response headers
+                       responseHeadersString,
+                       responseHeaders,
+                       // transport
+                       transport,
+                       // timeout handle
+                       timeoutTimer,
+                       // The jXHR state
+                       state = 0,
+                       // Loop variable
+                       i,
+                       // Fake xhr
+                       jXHR = {
+
+                               readyState: 0,
+
+                               // Caches the header
+                               setRequestHeader: function(name,value) {
+                                       if ( state === 0 ) {
+                                               requestHeaders[ name.toLowerCase() ] = value;
+                                       }
+                                       return this;
+                               },
 
-               // convert data if not already a string
-               if ( s.data && s.processData && typeof s.data !== "string" ) {
-                       s.data = jQuery.param( s.data, s.traditional );
-               }
+                               // Raw string
+                               getAllResponseHeaders: function() {
+                                       return state === 2 ? responseHeadersString : null;
+                               },
 
-               // Handle JSONP Parameter Callbacks
-               if ( s.dataType === "jsonp" ) {
-                       if ( type === "GET" ) {
-                               if ( !jsre.test( s.url ) ) {
-                                       s.url += (rquery.test( s.url ) ? "&" : "?") + (s.jsonp || "callback") + "=?";
+                               // Builds headers hashtable if needed
+                               // (match is used internally)
+                               getResponseHeader: function( key , match ) {
+
+                                       if ( state !== 2 ) {
+                                               return null;
+                                       }
+
+                                       if ( responseHeaders === undefined ) {
+
+                                               responseHeaders = {};
+
+                                               if ( typeof responseHeadersString === "string" ) {
+
+                                                       while( ( match = rheaders.exec( responseHeadersString ) ) ) {
+                                                               responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
+                                                       }
+                                               }
+                                       }
+                                       return responseHeaders[ key.toLowerCase() ];
+                               },
+
+                               // Cancel the request
+                               abort: function( statusText ) {
+                                       if ( transport && state !== 2 ) {
+                                               transport.abort( statusText || "abort" );
+                                               done( 0 , statusText );
+                                       }
+                                       return this;
                                }
-                       } else if ( !s.data || !jsre.test(s.data) ) {
-                               s.data = (s.data ? s.data + "&" : "") + (s.jsonp || "callback") + "=?";
+                       };
+
+               // Callback for when everything is done
+               // It is defined here because jslint complains if it is declared
+               // at the end of the function (which would be more logical and readable)
+               function done( status , statusText , response , headers) {
+
+                       // Called once
+                       if ( state === 2 ) {
+                               return;
                        }
-                       s.dataType = "json";
-               }
 
-               // Build temporary JSONP function
-               if ( s.dataType === "json" && (s.data && jsre.test(s.data) || jsre.test(s.url)) ) {
-                       jsonp = s.jsonpCallback || ("jsonp" + jsc++);
+                       // State is "done" now
+                       state = 2;
+
+                       // Set readyState
+                       jXHR.readyState = status ? 4 : 0;
 
-                       // Replace the =? sequence both in the query string and the data
-                       if ( s.data ) {
-                               s.data = (s.data + "").replace(jsre, "=" + jsonp + "$1");
+                       // Cache response headers
+                       responseHeadersString = headers || "";
+
+                       // Clear timeout if it exists
+                       if ( timeoutTimer ) {
+                               clearTimeout(timeoutTimer);
                        }
 
-                       s.url = s.url.replace(jsre, "=" + jsonp + "$1");
+                       var // Reference url
+                               url = s.url,
+                               // and ifModified status
+                               ifModified = s.ifModified,
+
+                               // Is it a success?
+                               isSuccess = 0,
+                               // Stored success
+                               success,
+                               // Stored error
+                               error = statusText;
+
+                       // If not timeout, force a jQuery-compliant status text
+                       if ( statusText != "timeout" ) {
+                               statusText = ( status >= 200 && status < 300 ) ?
+                                       "success" :
+                                       ( status === 304 ? "notmodified" : "error" );
+                       }
 
-                       // We need to make sure
-                       // that a JSONP style response is executed properly
-                       s.dataType = "script";
+                       // If successful, handle type chaining
+                       if ( statusText === "success" || statusText === "notmodified" ) {
 
-                       // Handle JSONP-style loading
-                       window[ jsonp ] = window[ jsonp ] || function( tmp ) {
-                               data = tmp;
-                               success();
-                               complete();
-                               // Garbage collect
-                               window[ jsonp ] = undefined;
+                               // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
+                               if ( s.ifModified ) {
 
-                               try {
-                                       delete window[ jsonp ];
-                               } catch(e) {}
+                                       var lastModified = jXHR.getResponseHeader("Last-Modified"),
+                                               etag = jXHR.getResponseHeader("Etag");
 
-                               if ( head ) {
-                                       head.removeChild( script );
+                                       if (lastModified) {
+                                               jQuery_lastModified[ s.url ] = lastModified;
+                                       }
+                                       if (etag) {
+                                               jQuery_etag[ s.url ] = etag;
+                                       }
                                }
-                       };
-               }
 
-               if ( s.dataType === "script" && s.cache === null ) {
-                       s.cache = false;
-               }
+                               if ( s.ifModified && statusText === "notmodified" ) {
+
+                                       success = null;
+                                       isSuccess = 1;
 
-               if ( s.cache === false && type === "GET" ) {
-                       var ts = now();
+                               } else {
+                                       // Chain data conversions and determine the final value
+                                       // (if an exception is thrown in the process, it'll be notified as an error)
+                                       try {
 
-                       // try replacing _= if it is there
-                       var ret = s.url.replace(rts, "$1_=" + ts + "$2");
+                                               var i,
+                                                       current,
+                                                       prev,
+                                                       checker,
+                                                       conv,
+                                                       conv1,
+                                                       conv2,
+                                                       convertion,
+                                                       dataTypes = s.dataTypes,
+                                                       converters = s.converters,
+                                                       responses = {
+                                                               "xml": "XML",
+                                                               "text": "Text"
+                                                       };
+
+                                               for( i = 0 ; i < dataTypes.length ; i++ ) {
+
+                                                       current = dataTypes[ i ];
+
+                                                       if ( responses[ current ] ) {
+                                                               jXHR[ "response" + responses[ current ] ] = response;
+                                                               responses[ current ] = 0;
+                                                       }
+
+                                                       if ( i ) {
+
+                                                               prev = dataTypes[ i - 1 ];
+
+                                                               if ( prev !== "*" && current !== "*" && prev !== current ) {
+
+                                                                       conv = converters[ ( conversion = prev + " " + current ) ] ||
+                                                                               converters[ "* " + current ];
+
+                                                                       conv1 = conv2 = 0;
+
+                                                                       if ( ! conv && prev !== "text" && current !== "text" ) {
+                                                                               conv1 = converters[ prev + " text" ] || converters[ "* text" ];
+                                                                               conv2 = converters[ "text " + current ];
+                                                                               if ( conv1 === true ) {
+                                                                                       conv = conv2;
+                                                                               } else if ( conv2 === true ) {
+                                                                                       conv = conv1;
+                                                                               }
+                                                                       }
+
+                                                                       if ( ! ( conv || conv1 && conv2 ) ) {
+                                                                               throw conversion;
+                                                                       }
+
+                                                                       if ( conv !== true ) {
+                                                                               response = conv ? conv( response ) : conv2( conv1( response ) );
+                                                                       }
+                                                               }
+                                                       } else if ( s.dataFilter ) {
+
+                                                               response = s.dataFilter( response );
+                                                               dataTypes = s.dataTypes;
+                                                       }
+                                               }
 
-                       // if nothing was replaced, add timestamp to the end
-                       s.url = ret + ((ret === s.url) ? (rquery.test(s.url) ? "&" : "?") + "_=" + ts : "");
-               }
+                                               // We have a real success
+                                               success = response;
+                                               isSuccess = 1;
 
-               // If data is available, append data to url for get requests
-               if ( s.data && type === "GET" ) {
-                       s.url += (rquery.test(s.url) ? "&" : "?") + s.data;
-               }
+                                       } catch(e) {
 
-               // Watch for a new set of requests
-               if ( s.global && ! jQuery.active++ ) {
-                       jQuery.event.trigger( "ajaxStart" );
-               }
+                                               statusText = "parsererror";
+                                               error = "" + e;
 
-               // Matches an absolute URL, and saves the domain
-               var parts = rurl.exec( s.url ),
-                       remote = parts && (parts[1] && parts[1] !== location.protocol || parts[2] !== 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" && 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;
-                       }
+                                       }
+                               }
 
-                       // Handle Script loading
-                       if ( !jsonp ) {
-                               var done = false;
-
-                               // Attach handlers for all browsers
-                               script.onload = script.onreadystatechange = function() {
-                                       if ( !done && (!this.readyState ||
-                                                       this.readyState === "loaded" || this.readyState === "complete") ) {
-                                               done = true;
-                                               success();
-                                               complete();
-
-                                               // Handle memory leak in IE
-                                               script.onload = script.onreadystatechange = null;
-                                               if ( head && script.parentNode ) {
-                                                       head.removeChild( script );
-                                               }
+                       } else { // if not success, mark it as an error
+
+                                       error = error || statusText;
+
+                                       // Set responseText if needed
+                                       if ( response ) {
+                                               jXHR.responseText = response;
                                        }
-                               };
                        }
 
-                       // Use insertBefore instead of appendChild  to circumvent an IE6 bug.
-                       // This arises when a base node is used (#2709 and #4378).
-                       head.insertBefore( script, head.firstChild );
+                       // Set data for the fake xhr object
+                       jXHR.status = status;
+                       jXHR.statusText = statusText;
 
-                       // We handle everything using the script element injection
-                       return undefined;
+                       // Success/Error
+                       if ( isSuccess ) {
+                               deferred.fire( callbackContext , [ success , statusText , jXHR ] );
+                       } else {
+                               deferred.fireReject( callbackContext , [ jXHR , statusText , error ] );
+                       }
+
+                       if ( s.global ) {
+                               globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ) ,
+                                               [ jXHR , s , isSuccess ? success : error ] );
+                       }
+
+                       // Complete
+                       completeDeferred.fire( callbackContext, [ jXHR , statusText ] );
+
+                       if ( s.global ) {
+                               globalEventContext.trigger( "ajaxComplete" , [ jXHR , s] );
+                               // Handle the global AJAX counter
+                               if ( ! --jQuery.active ) {
+                                       jQuery.event.trigger( "ajaxStop" );
+                               }
+                       }
                }
 
-               var requestDone = false;
+               // Attach deferreds
+               deferred.promise( jXHR );
+               jXHR.success = jXHR.done;
+               jXHR.error = jXHR.fail;
+               jXHR.complete = completeDeferred.done;
 
-               // Create the request object
-               var xhr = s.xhr();
+               // Remove hash character (#7531: and string promotion)
+               s.url = ( "" + s.url ).replace( rhash , "" );
 
-               if ( !xhr ) {
-                       return;
+               // Uppercase the type
+               s.type = s.type.toUpperCase();
+
+               // Determine if request has content
+               s.hasContent = ! rnoContent.test( s.type );
+
+               // Extract dataTypes list
+               s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( /\s+/ );
+
+               // Determine if a cross-domain request is in order
+               var parts = rurl.exec( s.url.toLowerCase() ),
+                       loc = location;
+               s.crossDomain = !!(
+                               parts &&
+                               ( parts[ 1 ] && parts[ 1 ] != loc.protocol ||
+                                       parts[ 2 ] != loc.hostname ||
+                                       ( parts[ 3 ] || 80 ) != ( loc.port || 80 ) )
+               );
+
+               // Convert data if not already a string
+               if ( s.data && s.processData && typeof s.data != "string" ) {
+                       s.data = jQuery.param( s.data , s.traditional );
                }
 
-               // Open the socket
-               // Passing null username, generates a login popup on Opera (#2865)
-               if ( s.username ) {
-                       xhr.open(type, s.url, s.async, s.username, s.password);
-               } else {
-                       xhr.open(type, s.url, s.async);
+               // Get transport
+               transport = jQuery.ajax.prefilter( s ).transport( s );
+
+               // Watch for a new set of requests
+               if ( s.global && jQuery.active++ === 0 ) {
+                       jQuery.event.trigger( "ajaxStart" );
                }
 
-               // Need an extra try/catch for cross domain requests in Firefox 3
-               try {
+               // If no transport, we auto-abort
+               if ( ! transport ) {
+
+                       done( 0 , "transport not found" );
+                       jXHR = false;
+
+               } else {
+
+                       // More options handling for requests with no content
+                       if ( ! s.hasContent ) {
+
+                               // If data is available, append data to url
+                               if ( s.data ) {
+                                       s.url += ( rquery.test( s.url ) ? "&" : "?" ) + s.data;
+                               }
+
+                               // Add anti-cache in url if needed
+                               if ( s.cache === false ) {
+
+                                       var ts = jQuery.now(),
+                                               // try replacing _= if it is there
+                                               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 : "");
+                               }
+                       }
+
                        // Set the correct header, if data is being sent
-                       if ( s.data || origSettings && origSettings.contentType ) {
-                               xhr.setRequestHeader("Content-Type", s.contentType);
+                       if ( s.data && s.hasContent && s.contentType !== false || options.contentType ) {
+                               requestHeaders[ "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]);
+                               if ( jQuery_lastModified[ s.url ] ) {
+                                       requestHeaders[ "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 ] ) {
+                                       requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
                                }
                        }
 
-                       // Set header so the called script knows that it's an 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._default );
-               } catch(e) {}
-
-               // Allow custom headers/mimetypes and early abort
-               if ( s.beforeSend && s.beforeSend.call(callbackContext, xhr, s) === false ) {
-                       // Handle the global AJAX counter
-                       if ( s.global && ! --jQuery.active ) {
-                               jQuery.event.trigger( "ajaxStop" );
+                       requestHeaders.accept = s.dataTypes[ 0 ] && s.accepts[ s.dataTypes[ 0 ] ] ?
+                               s.accepts[ s.dataTypes[ 0 ] ] + ( s.dataTypes[ 0 ] !== "*" ? ", */*; q=0.01" : "" ) :
+                               s.accepts[ "*" ];
+
+                       // Check for headers option
+                       for ( i in s.headers ) {
+                               requestHeaders[ i.toLowerCase() ] = s.headers[ i ];
                        }
 
-                       // close opended socket
-                       xhr.abort();
-                       return false;
-               }
+                       // Allow custom headers/mimetypes and early abort
+                       if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
 
-               if ( s.global ) {
-                       trigger("ajaxSend", [xhr, s]);
-               }
+                                       // Abort if not done already
+                                       done( 0 , "abort" );
+                                       jXHR = false;
 
-               // Wait for a response to come back
-               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 ) {
-                                       complete();
-                               }
+                       } else {
+
+                               // Set state as sending
+                               state = 1;
+                               jXHR.readyState = 1;
 
-                               requestDone = true;
-                               if ( xhr ) {
-                                       xhr.onreadystatechange = jQuery.noop;
+                               // Install callbacks on deferreds
+                               for ( i in { success:1, error:1, complete:1 } ) {
+                                       jXHR[ i ]( s[ i ] );
                                }
 
-                       // 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;
-                               xhr.onreadystatechange = jQuery.noop;
-
-                               status = isTimeout === "timeout" ?
-                                       "timeout" :
-                                       !jQuery.httpSuccess( xhr ) ?
-                                               "error" :
-                                               s.ifModified && jQuery.httpNotModified( xhr, s.url ) ?
-                                                       "notmodified" :
-                                                       "success";
-
-                               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) {
-                                               status = "parsererror";
-                                       }
+                               // Send global event
+                               if ( s.global ) {
+                                       globalEventContext.trigger( "ajaxSend" , [ jXHR , s ] );
                                }
 
-                               // Make sure that the request was successful or notmodified
-                               if ( status === "success" || status === "notmodified" ) {
-                                       // JSONP handles its own success callback
-                                       if ( !jsonp ) {
-                                               success();
-                                       }
-                               } else {
-                                       jQuery.handleError(s, xhr, status);
+                               // Timeout
+                               if ( s.async && s.timeout > 0 ) {
+                                       timeoutTimer = setTimeout(function(){
+                                               jXHR.abort( "timeout" );
+                                       }, s.timeout);
                                }
 
-                               // Fire the complete handlers
-                               complete();
+                               // Try to send
+                               try {
+                                       transport.send(requestHeaders, done);
+                               } catch (e) {
+                                       // Propagate exception as error if not done
+                                       if ( status === 1 ) {
 
-                               if ( isTimeout === "timeout" ) {
-                                       xhr.abort();
-                               }
+                                               done(0, "error", "" + e);
+                                               jXHR = false;
 
-                               // Stop memory leaks
-                               if ( s.async ) {
-                                       xhr = null;
+                                       // Simply rethrow otherwise
+                                       } else {
+                                               jQuery.error(e);
+                                       }
                                }
                        }
-               };
+               }
 
-               // Override the abort handler, if we can (IE 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.call( xhr );
-                               }
+               return jXHR;
+       },
 
-                               onreadystatechange( "abort" );
+       // 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);
                        };
-               } catch(e) { }
-
-               // 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" || type === "DELETE" ? s.data : null );
-               } catch(e) {
-                       jQuery.handleError(s, xhr, null, e);
-                       // Fire the complete handlers
-                       complete();
-               }
 
-               // firefox 1.5 doesn't fire statechange for sync requests
-               if ( !s.async ) {
-                       onreadystatechange();
+               // Set traditional to true for jQuery <= 1.3.2 behavior.
+               if ( traditional === undefined ) {
+                       traditional = jQuery.ajaxSettings.traditional;
                }
 
-               function success() {
-                       // If a local callback was specified, fire it and pass it the data
-                       if ( s.success ) {
-                               s.success.call( callbackContext, data, status, xhr );
-                       }
+               // 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 );
+                       });
 
-                       // Fire the global callback
-                       if ( s.global ) {
-                               trigger( "ajaxSuccess", [xhr, s] );
+               } 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);
-                       }
-
-                       // The request was completed
-                       if ( s.global ) {
-                               trigger( "ajaxComplete", [xhr, s] );
-                       }
+               // Return the resulting serialization
+               return s.join("&").replace(r20, "+");
+       }
+});
 
-                       // Handle the global AJAX counter
-                       if ( s.global && ! --jQuery.active ) {
-                               jQuery.event.trigger( "ajaxStop" );
+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 );
                        }
-               }
-               
-               function trigger(type, args) {
-                       (s.context ? jQuery(s.context) : jQuery.event).trigger(type, args);
-               }
+               });
 
-               // return XMLHttpRequest to allow aborting the request etc.
-               return xhr;
-       },
+       } else if ( !traditional && obj != null && typeof obj === "object" ) {
+               // If we see an array here, it is empty and should be treated as an empty
+               // object
+               if ( jQuery.isArray( obj ) || jQuery.isEmptyObject( obj ) ) {
+                       add( prefix, "" );
 
-       handleError: function( s, xhr, status, e ) {
-               // If a local callback was specified, fire it
-               if ( s.error ) {
-                       s.error.call( s.context || s, xhr, status, e );
+               // Serialize object item.
+               } else {
+                       jQuery.each( obj, function( k, v ) {
+                               buildParams( prefix + "[" + k + "]", v, traditional, add );
+                       });
                }
 
-               // Fire the global callback
-               if ( s.global ) {
-                       (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );
-               }
-       },
+       } else {
+               // Serialize scalar item.
+               add( prefix, obj );
+       }
+}
+
+// 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,
 
-       // 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) {}
-
-               return false;
-       },
+       // Last-Modified header cache for next request
+       lastModified: {},
+       etag: {}
+
+});
+
+//Execute or select from functions in a given structure of options
+function ajax_selectOrExecute( structure , s ) {
+
+       var dataTypes = s.dataTypes,
+               transportDataType,
+               list,
+               selected,
+               i,
+               length,
+               checked = {},
+               flag,
+               noSelect = structure !== "transports";
+
+       function initSearch( dataType ) {
+
+               flag = transportDataType !== dataType && ! checked[ dataType ];
 
-       // Determines if an XMLHttpRequest returns NotModified
-       httpNotModified: function( xhr, url ) {
-               var lastModified = xhr.getResponseHeader("Last-Modified"),
-                       etag = xhr.getResponseHeader("Etag");
+               if ( flag ) {
 
-               if ( lastModified ) {
-                       jQuery.lastModified[url] = lastModified;
+                       checked[ dataType ] = 1;
+                       transportDataType = dataType;
+                       list = s[ structure ][ dataType ];
+                       i = -1;
+                       length = list ? list.length : 0 ;
                }
 
-               if ( etag ) {
-                       jQuery.etag[url] = etag;
+               return flag;
+       }
+
+       initSearch( dataTypes[ 0 ] );
+
+       for ( i = 0 ; ( noSelect || ! selected ) && i <= length ; i++ ) {
+
+               if ( i === length ) {
+
+                       initSearch( "*" );
+
+               } else {
+
+                       selected = list[ i ]( s , determineDataType );
+
+                       // If we got redirected to another dataType
+                       // Search there (if not in progress or already tried)
+                       if ( typeof( selected ) === "string" &&
+                               initSearch( selected ) ) {
+
+                               dataTypes.unshift( selected );
+                               selected = 0;
+                       }
                }
+       }
 
-               // Opera returns 0 when status is 304
-               return xhr.status === 304 || xhr.status === 0;
-       },
+       return noSelect ? jQuery.ajax : selected;
+}
+
+// Add an element to one of the structures in ajaxSettings
+function ajax_addElement( structure , args ) {
+
+       var i,
+               start = 0,
+               length = args.length,
+               dataTypes = [ "*" ],
+               dLength = 1,
+               dataType,
+               functors = [],
+               first,
+               append,
+               list;
 
-       httpData: function( xhr, type, s ) {
-               var ct = xhr.getResponseHeader("content-type") || "",
-                       xml = type === "xml" || !type && ct.indexOf("xml") >= 0,
-                       data = xml ? xhr.responseXML : xhr.responseText;
+       if ( length ) {
 
-               if ( xml && data.documentElement.nodeName === "parsererror" ) {
-                       jQuery.error( "parsererror" );
+               first = jQuery.type( args[ 0 ] );
+
+               if ( first === "object" ) {
+                       return ajax_selectOrExecute( structure , args[ 0 ] );
                }
 
-               // Allow a pre-filtering function to sanitize the response
-               // s is checked to keep backwards compatibility
-               if ( s && s.dataFilter ) {
-                       data = s.dataFilter( data, type );
+               structure = jQuery.ajaxSettings[ structure ];
+
+               if ( first !== "function" ) {
+
+                       dataTypes = args[ 0 ].toLowerCase().split(/\s+/);
+                       dLength = dataTypes.length;
+                       start = 1;
+
                }
 
-               // 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 ( dLength && start < length ) {
+
+                       functors = sliceFunc.call( args , start );
+
+                       for( i = 0 ; i < dLength ; i++ ) {
+
+                               dataType = dataTypes[ i ];
+
+                               first = /^\+/.test( dataType );
 
-                       // If the type is "script", eval it in global context
-                       } else if ( type === "script" || !type && ct.indexOf("javascript") >= 0 ) {
-                               jQuery.globalEval( data );
+                               if (first) {
+                                       dataType = dataType.substr(1);
+                               }
+
+                               if ( dataType !== "" ) {
+
+                                       append = Array.prototype[ first ? "unshift" : "push" ];
+                                       list = structure[ dataType ] = structure[ dataType ] || [];
+                                       append.apply( list , functors );
+                               }
                        }
                }
+       }
 
-               return data;
-       },
+       return jQuery.ajax;
+}
 
-       // Serialize an array of form elements or a set of
-       // key/values into a query string
-       param: function( a, traditional ) {
-               
-               var s = [];
-               
-               // Set traditional to true for jQuery <= 1.3.2 behavior.
-               if ( traditional === undefined ) {
-                       traditional = jQuery.ajaxSettings.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);
+// Install prefilter & transport methods
+jQuery.each( [ "prefilter" , "transport" ] , function( _ , name ) {
+       _ = name + "s";
+       jQuery.ajax[ name ] = function() {
+               return ajax_addElement( _ , arguments );
+       };
+} );
+
+// Utility function that handles dataType when response is received
+// (for those transports that can give text or xml responses)
+function determineDataType( s , ct , text , xml ) {
+
+       var contents = s.contents,
+               type,
+               regexp,
+               dataTypes = s.dataTypes,
+               transportDataType = dataTypes[0],
+               response;
+
+       // Auto (xml, json, script or text determined given headers)
+       if ( transportDataType === "*" ) {
+
+               for ( type in contents ) {
+                       if ( ( regexp = contents[ type ] ) && regexp.test( ct ) ) {
+                               transportDataType = dataTypes[0] = type;
+                               break;
+                       }
                }
-               
-               // 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.
-                       jQuery.each( a, function buildParams( prefix, obj ) {
-                               
-                               if ( jQuery.isArray(obj) ) {
-                                       // Serialize array item.
-                                       jQuery.each( obj, function( i, v ) {
-                                               if ( traditional ) {
-                                                       // 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 );
-                                               }
-                                       });
-                                       
-                               } else if ( !traditional && obj != null && typeof obj === "object" ) {
-                                       // Serialize object item.
-                                       jQuery.each( obj, function( k, v ) {
-                                               buildParams( prefix + "[" + k + "]", v );
-                                       });
-                                       
-                               } else {
-                                       // Serialize scalar item.
-                                       add( prefix, obj );
-                               }
-                       });
+       }
+
+       // xml and parsed as such
+       if ( transportDataType === "xml" &&
+               xml &&
+               xml.documentElement /* #4958 */ ) {
+
+               response = xml;
+
+       // Text response was provided
+       } else {
+
+               response = text;
+
+               // If it's not really text, defer to converters
+               if ( transportDataType !== "text" ) {
+                       dataTypes.unshift( "text" );
                }
-               
-               // Return the resulting serialization
-               return s.join("&").replace(r20, "+");
+
        }
 
-});
+       return response;
+}
+
+/*
+ * 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 ) {}
+       }
+
+       try {
+               return new window.ActiveXObject("Microsoft.XMLHTTP");
+       } catch( activeError ) {}
+       };
+}
+
+var testXHR = jQuery.ajaxSettings.xhr();
+
+// Does this browser support XHR requests?
+jQuery.support.ajax = !!testXHR;
+
+// Does this browser support crossDomain XHR requests
+jQuery.support.cors = testXHR && "withCredentials" in testXHR;
+
+})( jQuery );