Moves determineResponse logic into main ajax callback. Puts responseXXX fields defini...
[jquery.git] / src / ajax.js
index 5c655b5..bf0259c 100644 (file)
@@ -1,11 +1,20 @@
 (function( jQuery ) {
-       
-var 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,
+
+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 = /\?/,
-       r20 = /%20/g,
+       rscript = /<script\b[^<]*(?:(?!<\/script>)<[^<]*)*<\/script>/gi,
+       rselectTextarea = /^(?:select|textarea)/i,
+       rts = /([?&])_=[^&]*/,
+       rurl = /^(\w+:)?\/\/([^\/?#:]+)(?::(\d+))?/,
+       rCRLF = /\r?\n/g,
+
+       // Slice function
+       sliceFunc = Array.prototype.slice,
 
        // Keep a copy of the old load method
        _load = jQuery.fn.load;
@@ -43,35 +52,43 @@ jQuery.fn.extend({
                                type = "POST";
                        }
                }
-               
+
                var self = this;
-               
+
                // Request the remote document
                jQuery.ajax({
                        url: url,
                        type: type,
                        dataType: "html",
                        data: params,
-                       complete: function( res, status ) {
+                       // Complete callback (responseText is used internally)
+                       complete: function( jXHR, status, responseText ) {
+                               // Store the response as specified by the jXHR object
+                               responseText = jXHR.responseText;
                                // If successful, inject the HTML into all the matched elements
-                               if ( status === "success" || status === "notmodified" ) {
+                               if ( jXHR.isResolved() ) {
+                                       // #4825: Get the actual response in case
+                                       // a dataFilter is present in ajaxSettings
+                                       jXHR.done(function( r ) {
+                                               responseText = r;
+                                       });
                                        // See if a selector was specified
                                        self.html( selector ?
                                                // Create a dummy div to hold the results
                                                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, ""))
+                                                       .append(responseText.replace(rscript, ""))
 
                                                        // Locate the specified elements
                                                        .find(selector) :
 
                                                // If not, just inject the full result
-                                               res.responseText );
+                                               responseText );
                                }
 
                                if ( callback ) {
-                                       self.each( callback, [res.responseText, status, res] );
+                                       self.each( callback, [responseText, status, jXHR] );
                                }
                        }
                });
@@ -99,9 +116,9 @@ jQuery.fn.extend({
                                null :
                                jQuery.isArray(val) ?
                                        jQuery.map( val, function(val, i){
-                                               return {name: elem.name, value: val};
+                                               return { name: elem.name, value: val.replace(rCRLF, "\r\n") };
                                        }) :
-                                       {name: elem.name, value: val};
+                                       { name: elem.name, value: val.replace(rCRLF, "\r\n") };
                }).get();
        }
 });
@@ -113,9 +130,8 @@ jQuery.each( "ajaxStart ajaxStop ajaxComplete ajaxError ajaxSuccess ajaxSend".sp
        };
 });
 
-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 +140,16 @@ 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");
@@ -140,25 +159,11 @@ 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 );
+               jQuery.extend( true, jQuery.ajaxSettings, settings );
+               if ( settings.context ) {
+                       jQuery.ajaxSettings.context = settings.context;
+               }
        },
 
        ajaxSettings: {
@@ -172,15 +177,13 @@ jQuery.extend({
                timeout: 0,
                data: null,
                dataType: null,
-               dataTypes: null,
                username: null,
                password: null,
                cache: null,
                traditional: false,
+               headers: {},
+               crossDomain: null,
                */
-               xhr: function() {
-                       return new window.XMLHttpRequest();
-               },
 
                accepts: {
                        xml: "application/xml, text/xml",
@@ -190,12 +193,17 @@ jQuery.extend({
                        "*": "*/*"
                },
 
-               autoDataType: {
+               contents: {
                        xml: /xml/,
                        html: /html/,
                        json: /json/
                },
 
+               responseFields: {
+                       xml: "responseXML",
+                       text: "responseText"
+               },
+
                // Prefilters
                // 1) They are useful to introduce custom dataTypes (see transport/jsonp for an example)
                // 2) These are called:
@@ -215,7 +223,7 @@ jQuery.extend({
                // 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
-               dataConverters: {
+               converters: {
 
                        // Convert anything to text
                        "* text": window.String,
@@ -231,16 +239,532 @@ jQuery.extend({
                }
        },
 
+       ajaxPrefilter: function( a , b ) {
+               ajaxPrefilterOrTransport( "prefilters" , a , b );
+       },
+
+       ajaxTransport: function( a , b ) {
+               return ajaxPrefilterOrTransport( "transports" , a , b );
+       },
+
        // Main method
-       ajax: function( url , s ) {
-               
-               if ( arguments.length === 1 ) {
-                       s = url;
-                       url = s ? s.url : undefined;
+       ajax: function( url , options ) {
+
+               // If options is not an object,
+               // we simulate pre-1.5 signature
+               if ( typeof( options ) !== "object" ) {
+                       options = url;
+                       url = undefined;
+               }
+
+               // Force options to be an object
+               options = options || {};
+
+               var // Create the final options object
+                       s = jQuery.extend( true , {} , jQuery.ajaxSettings , options ),
+                       // jQuery lists
+                       jQuery_lastModified = jQuery.lastModified,
+                       jQuery_etag = jQuery.etag,
+                       // Callbacks contexts
+                       // We force the original context if it exists
+                       // or take it from jQuery.ajaxSettings otherwise
+                       // (plain objects used as context get extended)
+                       callbackContext =
+                               ( s.context = ( "context" in options ? options : jQuery.ajaxSettings ).context ) || s,
+                       globalEventContext = callbackContext === s ? jQuery.event : jQuery( callbackContext ),
+                       // Deferreds
+                       deferred = jQuery.Deferred(),
+                       completeDeferred = jQuery._Deferred(),
+                       // Status-dependent callbacks
+                       statusCode = s.statusCode || {},
+                       // Headers (they are sent all at once)
+                       requestHeaders = {},
+                       // Response headers
+                       responseHeadersString,
+                       responseHeaders,
+                       // transport
+                       transport,
+                       // timeout handle
+                       timeoutTimer,
+                       // Cross-domain detection vars
+                       loc = document.location,
+                       protocol = loc.protocol || "http:",
+                       parts,
+                       // 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;
+                               },
+
+                               // Raw string
+                               getAllResponseHeaders: function() {
+                                       return state === 2 ? responseHeadersString : null;
+                               },
+
+                               // Builds headers hashtable if needed
+                               getResponseHeader: function( key ) {
+
+                                       var match;
+
+                                       if ( state === 2 ) {
+
+                                               if ( !responseHeaders ) {
+
+                                                       responseHeaders = {};
+
+                                                       while( ( match = rheaders.exec( responseHeadersString ) ) ) {
+                                                               responseHeaders[ match[ 1 ].toLowerCase() ] = match[ 2 ];
+                                                       }
+                                               }
+                                               match = responseHeaders[ key.toLowerCase() ];
+
+                                       }
+
+                                       return match || null;
+                               },
+
+                               // Cancel the request
+                               abort: function( statusText ) {
+                                       if ( transport ) {
+                                               transport.abort( statusText || "abort" );
+                                       }
+                                       done( 0 , statusText );
+                                       return this;
+                               }
+                       };
+
+               // 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 , responses , headers) {
+
+                       // Called once
+                       if ( state === 2 ) {
+                               return;
+                       }
+
+                       // State is "done" now
+                       state = 2;
+
+                       // Dereference transport for early garbage collection
+                       // (no matter how long the jXHR object will be used)
+                       transport = undefined;
+
+                       // Set readyState
+                       jXHR.readyState = status ? 4 : 0;
+
+                       // Cache response headers
+                       responseHeadersString = headers || "";
+
+                       // Clear timeout if it exists
+                       if ( timeoutTimer ) {
+                               clearTimeout(timeoutTimer);
+                       }
+
+                       var // Reference dataTypes and responseFields
+                               dataTypes = s.dataTypes,
+                               responseFields = s.responseFields,
+                               responseField,
+
+                               // Flag to mark as success
+                               isSuccess,
+                               // Stored success
+                               success,
+                               // Stored error
+                               error,
+
+                               // To keep track of statusCode based callbacks
+                               oldStatusCode,
+
+                               // Actual response
+                               response;
+
+                       // If we got responses:
+                       // - find the right one
+                       // - update dataTypes accordingly
+                       // - set responseXXX accordingly too
+                       if ( responses ) {
+
+                               var contents = s.contents,
+                                       transportDataType = dataTypes[0],
+                                       ct,
+                                       type,
+                                       finalDataType;
+
+                               // Auto (xml, json, script or text determined given headers)
+                               if ( transportDataType === "*" && ( ct = jXHR.getResponseHeader( "content-type" ) ) ) {
+
+                                       for ( type in contents ) {
+                                               if ( contents[ type ] && contents[ type ].test( ct ) ) {
+                                                       transportDataType = dataTypes[0] = type;
+                                                       break;
+                                               }
+                                       }
+
+                                       type = undefined;
+                               }
+
+                               // Get final dataType
+                               for( type in responses ) {
+                                       if ( ! finalDataType && type === transportDataType ) {
+                                               finalDataType = type;
+                                       }
+                                       responseField = responseFields[ type ];
+                                       if ( responseField && ! ( responseField in jXHR ) ) {
+                                               jXHR[ responseField ] = responses[ type ];
+                                       }
+                               }
+
+                               // If no response with the expected dataType was provided
+                               // Take the last response as a default if it exists
+                               if ( ! finalDataType && type ) {
+                                       finalDataType = type;
+                                       if ( transportDataType === "*" ) {
+                                               dataTypes.shift();
+                                       }
+                                       dataTypes.unshift( finalDataType );
+                               }
+
+                               // Get final response
+                               response = responses[ finalDataType ];
+                       }
+
+                       // If successful, handle type chaining
+                       if ( status >= 200 && status < 300 || status === 304 ) {
+
+                               // Set the If-Modified-Since and/or If-None-Match header, if in ifModified mode.
+                               if ( s.ifModified ) {
+
+                                       var lastModified = jXHR.getResponseHeader("Last-Modified"),
+                                               etag = jXHR.getResponseHeader("Etag");
+
+                                       if (lastModified) {
+                                               jQuery_lastModified[ s.url ] = lastModified;
+                                       }
+                                       if (etag) {
+                                               jQuery_etag[ s.url ] = etag;
+                                       }
+                               }
+
+                               // If not modified
+                               if ( status === 304 ) {
+
+                                       statusText = "notmodified";
+                                       isSuccess = 1;
+
+                               // If we have data
+                               } else {
+
+                                       statusText = "success";
+
+                                       // Chain data conversions and determine the final value
+                                       // (if an exception is thrown in the process, it'll be notified as an error)
+                                       try {
+
+                                               var i,
+                                                       // Current dataType
+                                                       current,
+                                                       // Previous dataType
+                                                       prev,
+                                                       // Conversion expression
+                                                       conversion,
+                                                       // Conversion function
+                                                       conv,
+                                                       // Conversion functions (when text is used in-between)
+                                                       conv1,
+                                                       conv2,
+                                                       // Local references to converters
+                                                       converters = s.converters;
+
+                                               // For each dataType in the chain
+                                               for( i = 0 ; i < dataTypes.length ; i++ ) {
+
+                                                       current = dataTypes[ i ];
+
+                                                       // If a responseXXX field for this dataType exists
+                                                       // and if it hasn't been set yet
+                                                       responseField = responseFields[ current ];
+                                                       if ( responseField && ! ( responseField in jXHR ) ) {
+                                                               jXHR[ responseField ] = response;
+                                                       }
+
+                                                       // If this is not the first element
+                                                       if ( i ) {
+
+                                                               // Get the dataType to convert from
+                                                               prev = dataTypes[ i - 1 ];
+
+                                                               // If no catch-all and dataTypes are actually different
+                                                               if ( prev !== "*" && current !== "*" && prev !== current ) {
+
+                                                                       // Get the converter
+                                                                       conversion = prev + " " + current;
+                                                                       conv = converters[ conversion ] || converters[ "* " + current ];
+
+                                                                       conv1 = conv2 = 0;
+
+                                                                       // If there is no direct converter and none of the dataTypes is text
+                                                                       if ( ! conv && prev !== "text" && current !== "text" ) {
+                                                                               // Try with text in-between
+                                                                               conv1 = converters[ prev + " text" ] || converters[ "* text" ];
+                                                                               conv2 = converters[ "text " + current ];
+                                                                               // Revert back to a single converter
+                                                                               // if one of the converter is an equivalence
+                                                                               if ( conv1 === true ) {
+                                                                                       conv = conv2;
+                                                                               } else if ( conv2 === true ) {
+                                                                                       conv = conv1;
+                                                                               }
+                                                                       }
+                                                                       // If we found no converter, dispatch an error
+                                                                       if ( ! ( conv || conv1 && conv2 ) ) {
+                                                                               throw conversion;
+                                                                       }
+                                                                       // If found converter is not an equivalence
+                                                                       if ( conv !== true ) {
+                                                                               // Convert with 1 or 2 converters accordingly
+                                                                               response = conv ? conv( response ) : conv2( conv1( response ) );
+                                                                       }
+                                                               }
+                                                       // If it is the first element of the chain
+                                                       // and we have a dataFilter
+                                                       } else if ( s.dataFilter ) {
+                                                               // Apply the dataFilter
+                                                               response = s.dataFilter( response , current );
+                                                               // Get dataTypes again in case the filter changed them
+                                                               dataTypes = s.dataTypes;
+                                                       }
+                                               }
+                                               // End of loop
+
+                                               // We have a real success
+                                               success = response;
+                                               isSuccess = 1;
+
+                                       // If an exception was thrown
+                                       } catch(e) {
+
+                                               // We have a parsererror
+                                               statusText = "parsererror";
+                                               error = "" + e;
+
+                                       }
+                               }
+
+                       // if not success, mark it as an error
+                       } else {
+                                       error = statusText = statusText || "error";
+                       }
+
+                       // Set data for the fake xhr object
+                       jXHR.status = status;
+                       jXHR.statusText = statusText;
+
+                       // Success/Error
+                       if ( isSuccess ) {
+                               deferred.resolveWith( callbackContext , [ success , statusText , jXHR ] );
+                       } else {
+                               deferred.rejectWith( callbackContext , [ jXHR , statusText , error ] );
+                       }
+
+                       // Status-dependent callbacks
+                       oldStatusCode = statusCode;
+                       statusCode = undefined;
+                       jXHR.statusCode( oldStatusCode );
+
+                       if ( s.global ) {
+                               globalEventContext.trigger( "ajax" + ( isSuccess ? "Success" : "Error" ) ,
+                                               [ jXHR , s , isSuccess ? success : error ] );
+                       }
+
+                       // Complete
+                       completeDeferred.resolveWith( callbackContext, [ jXHR , statusText ] );
+
+                       if ( s.global ) {
+                               globalEventContext.trigger( "ajaxComplete" , [ jXHR , s] );
+                               // Handle the global AJAX counter
+                               if ( ! --jQuery.active ) {
+                                       jQuery.event.trigger( "ajaxStop" );
+                               }
+                       }
+               }
+
+               // Attach deferreds
+               deferred.promise( jXHR );
+               jXHR.success = jXHR.done;
+               jXHR.error = jXHR.fail;
+               jXHR.complete = completeDeferred.done;
+
+               // Status-dependent callbacks
+               jXHR.statusCode = function( map ) {
+                       if ( map ) {
+                               var tmp;
+                               if ( statusCode ) {
+                                       for( tmp in map ) {
+                                               statusCode[ tmp ] = [ statusCode[ tmp ] , map[ tmp ] ];
+                                       }
+                               } else {
+                                       tmp = map[ jXHR.status ];
+                                       jXHR.done( tmp ).fail( tmp );
+                               }
+                       }
+                       return this;
+               };
+
+               // Remove hash character (#7531: and string promotion)
+               // We also use the url parameter if available
+               s.url = ( "" + ( url || s.url ) ).replace( rhash , "" );
+
+               // Extract dataTypes list
+               s.dataTypes = jQuery.trim( s.dataType || "*" ).toLowerCase().split( /\s+/ );
+
+               // Determine if a cross-domain request is in order
+               if ( ! s.crossDomain ) {
+                       parts = rurl.exec( s.url.toLowerCase() );
+                       s.crossDomain = !!(
+                                       parts &&
+                                       ( parts[ 1 ] && parts[ 1 ] != protocol ||
+                                               parts[ 2 ] != loc.hostname ||
+                                               ( parts[ 3 ] || ( ( parts[ 1 ] || protocol ) === "http:" ? 80 : 443 ) ) !=
+                                                       ( loc.port || ( protocol === "http:" ? 80 : 443 ) ) )
+                       );
+               }
+
+               // Convert data if not already a string
+               if ( s.data && s.processData && typeof s.data !== "string" ) {
+                       s.data = jQuery.param( s.data , s.traditional );
+               }
+
+               // Apply prefilters
+               jQuery.ajaxPrefilter( s , options );
+
+               // Uppercase the type
+               s.type = s.type.toUpperCase();
+
+               // Determine if request has content
+               s.hasContent = ! rnoContent.test( s.type );
+
+               // Watch for a new set of requests
+               if ( s.global && jQuery.active++ === 0 ) {
+                       jQuery.event.trigger( "ajaxStart" );
+               }
+
+               // 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 && 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 ] ) {
+                               requestHeaders[ "if-modified-since" ] = jQuery_lastModified[ s.url ];
+                       }
+                       if ( jQuery_etag[ s.url ] ) {
+                               requestHeaders[ "if-none-match" ] = jQuery_etag[ s.url ];
+                       }
+               }
+
+               // Set the Accepts header for the server, depending on the dataType
+               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 ];
+               }
+
+               // Allow custom headers/mimetypes and early abort
+               if ( s.beforeSend && ( s.beforeSend.call( callbackContext , jXHR , s ) === false || state === 2 ) ) {
+
+                               // Abort if not done already
+                               done( 0 , "abort" );
+
+                               // Return false
+                               jXHR = false;
+
+               } else {
+
+                       // Install callbacks on deferreds
+                       for ( i in { success:1, error:1, complete:1 } ) {
+                               jXHR[ i ]( s[ i ] );
+                       }
+
+                       // Get transport
+                       transport = jQuery.ajaxTransport( s , options );
+
+                       // If no transport, we auto-abort
+                       if ( ! transport ) {
+
+                               done( 0 , "notransport" );
+
+                       } else {
+
+                               // Set state as sending
+                               state = jXHR.readyState = 1;
+
+                               // Send global event
+                               if ( s.global ) {
+                                       globalEventContext.trigger( "ajaxSend" , [ jXHR , s ] );
+                               }
+
+                               // Timeout
+                               if ( s.async && s.timeout > 0 ) {
+                                       timeoutTimer = setTimeout(function(){
+                                               jXHR.abort( "timeout" );
+                                       }, s.timeout);
+                               }
+
+                               // Try to send
+                               try {
+                                       transport.send(requestHeaders, done);
+                               } catch (e) {
+                                       // Propagate exception as error if not done
+                                       if ( status === 1 ) {
+
+                                               done(0, "error", "" + e);
+                                               jXHR = false;
+
+                                       // Simply rethrow otherwise
+                                       } else {
+                                               jQuery.error(e);
+                                       }
+                               }
+                       }
                }
-               
-               return jQuery.xhr().open( s ? s.type : undefined , url ).send( undefined , s );
-               
+
+               return jXHR;
        },
 
        // Serialize an array of form elements or a set of
@@ -252,19 +776,19 @@ jQuery.extend({
                                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.
@@ -297,7 +821,7 @@ function buildParams( prefix, obj, traditional, add ) {
                                buildParams( prefix + "[" + ( typeof v === "object" || jQuery.isArray(v) ? i : "" ) + "]", v, traditional, add );
                        }
                });
-                       
+
        } 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
@@ -310,7 +834,7 @@ function buildParams( prefix, obj, traditional, add ) {
                                buildParams( prefix + "[" + k + "]", v, traditional, add );
                        });
                }
-                                       
+
        } else {
                // Serialize scalar item.
                add( prefix, obj );
@@ -330,33 +854,97 @@ jQuery.extend({
 
 });
 
-/*
- * 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 ) {}
-       };
-}
+// Base function for both ajaxPrefilter and ajaxTransport
+function ajaxPrefilterOrTransport( arg0 , arg1 , arg2 ) {
+
+       var type = jQuery.type( arg1 ),
+               structure = jQuery.ajaxSettings[ arg0 ],
+               i,
+               length;
+
+       // We have an options map so we have to inspect the structure
+       if ( type === "object" ) {
+
+               var options = arg1,
+                       originalOptions = arg2,
+                       // When dealing with prefilters, we execute only
+                       // (no selection so we never stop when a function
+                       // returns a non-falsy, non-string value)
+                       executeOnly = ( arg0 === "prefilters" ),
+                       inspect = function( dataType, tested ) {
+
+                               if ( ! tested[ dataType ] ) {
+
+                                       tested[ dataType ] = true;
+
+                                       var list = structure[ dataType ],
+                                               selected;
+
+                                       for( i = 0, length = list ? list.length : 0 ; ( executeOnly || ! selected ) && i < length ; i++ ) {
+                                               selected = list[ i ]( options , originalOptions );
+                                               // If we got redirected to a different dataType,
+                                               // we add it and switch to the corresponding list
+                                               if ( typeof( selected ) === "string" && selected !== dataType ) {
+                                                       options.dataTypes.unshift( selected );
+                                                       selected = inspect( selected , tested );
+                                                       // We always break in order not to continue
+                                                       // to iterate in previous list
+                                                       break;
+                                               }
+                                       }
+                                       // If we're only executing or nothing was selected
+                                       // we try the catchall dataType
+                                       if ( executeOnly || ! selected ) {
+                                               selected = inspect( "*" , tested );
+                                       }
+                                       // This will be ignored by ajaxPrefilter
+                                       // so it's safe to return no matter what
+                                       return selected;
+                               }
 
-var testXHR = jQuery.ajaxSettings.xhr();
+                       };
 
-// Does this browser support XHR requests?
-jQuery.support.ajax = !!testXHR;
+               // Start inspection with current transport dataType
+               return inspect( options.dataTypes[ 0 ] , {} );
 
-// Does this browser support crossDomain XHR requests
-jQuery.support.cors = testXHR && "withCredentials" in testXHR;
+       } else {
+
+               // We're requested to add to the structure
+               // Signature is ( dataTypeExpression , function )
+               // with dataTypeExpression being optional and
+               // defaulting to catchAll (*)
+               type = type === "function";
+
+               if ( type ) {
+                       arg2 = arg1;
+                       arg1 = undefined;
+               }
+               arg1 = arg1 || "*";
+
+               // We control that the second argument is really a function
+               if ( type || jQuery.isFunction( arg2 ) ) {
+
+                       var dataTypes = arg1.split( /\s+/ ),
+                               functor = arg2,
+                               dataType,
+                               list,
+                               placeBefore;
+
+                       // For each dataType in the dataTypeExpression
+                       for( i = 0 , length = dataTypes.length ; i < length ; i++ ) {
+                               dataType = dataTypes[ i ];
+                               // We control if we're asked to add before
+                               // any existing element
+                               placeBefore = /^\+/.test( dataType );
+                               if ( placeBefore ) {
+                                       dataType = dataType.substr( 1 );
+                               }
+                               list = structure[ dataType ] = structure[ dataType ] || [];
+                               // then we add to the structure accordingly
+                               list[ placeBefore ? "unshift" : "push" ]( functor );
+                       }
+               }
+       }
+}
 
 })( jQuery );