jquery/src/ajax/ajax.js

jQuery.fn.extend({

	/**
	 * Load HTML from a remote file and inject it into the DOM, only if it's
	 * been modified by the server.
	 *
	 * @example $("#feeds").loadIfModified("feeds.html");
	 * @before <div id="feeds"></div>
	 * @result <div id="feeds"><b>45</b> feeds found.</div>
	 *
	 * @name loadIfModified
	 * @type jQuery
	 * @param String url The URL of the HTML file to load.
	 * @param Map params (optional) Key/value pairs that will be sent to the server.
	 * @param Function callback (optional) A function to be executed whenever the data is loaded (parameters: responseText, status and response itself).
	 * @cat Ajax
	 */
	// DEPRECATED
	loadIfModified: function( url, params, callback ) {
		this.load( url, params, callback, 1 );
	},

	/**
	 * Load HTML from a remote file and inject it into the DOM.
	 *
	 * Note: Avoid to use this to load scripts, instead use $.getScript.
	 * IE strips script tags when there aren't any other characters in front of it.
	 *
	 * @example $("#feeds").load("feeds.html");
	 * @before <div id="feeds"></div>
	 * @result <div id="feeds"><b>45</b> feeds found.</div>
	 *
 	 * @example $("#feeds").load("feeds.html",
 	 *   {limit: 25},
 	 *   function() { alert("The last 25 entries in the feed have been loaded"); }
 	 * );
	 * @desc Same as above, but with an additional parameter
	 * and a callback that is executed when the data was loaded.
	 *
	 * @name load
	 * @type jQuery
	 * @param String url The URL of the HTML file to load.
	 * @param Object params (optional) A set of key/value pairs that will be sent as data to the server.
	 * @param Function callback (optional) A function to be executed whenever the data is loaded (parameters: responseText, status and response itself).
	 * @cat Ajax
	 */
	load: function( url, params, callback, ifModified ) {
		if ( jQuery.isFunction( url ) )
			return this.bind("load", url);

		var off = url.indexOf(" ");
		var selector = url.slice(off, url.length);
		url = url.slice(0, off);

		callback = callback || function(){};

		// Default to a GET request
		var type = "GET";

		// If the second parameter was provided
		if ( params )
			// If it's a function
			if ( jQuery.isFunction( params ) ) {
				// We assume that it's the callback
				callback = params;
				params = null;

			// Otherwise, build a param string
			} else {
				params = jQuery.param( params );
				type = "POST";
			}

		var self = this;

		// Request the remote document
		jQuery.ajax({
			url: url,
			type: type,
			data: params,
			ifModified: ifModified,
			complete: function(res, status){
				// If successful, inject the HTML into all the matched elements
				if ( status == "success" || !ifModified && status == "notmodified" )
					// 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(/<script(.|\s)*?\/script>/g, ""))

							// Locate the specified elements
							.find(selector) :

						// If not, just inject the full result
						res.responseText );

				// Add delay to account for Safari's delay in globalEval
				setTimeout(function(){
					self.each( callback, [res.responseText, status, res] );
				}, 13);
			}
		});
		return this;
	},

	/**
	 * Serializes a set of input elements into a string of data.
	 * This will serialize all given elements.
	 *
	 * A serialization similar to the form submit of a browser is
	 * provided by the [http://www.malsup.com/jquery/form/ Form Plugin].
	 * It also takes multiple-selects 
	 * into account, while this method recognizes only a single option.
	 *
	 * @example $("input[@type=text]").serialize();
	 * @before <input type='text' name='name' value='John'/>
	 * <input type='text' name='location' value='Boston'/>
	 * @after name=John&amp;location=Boston
	 * @desc Serialize a selection of input elements to a string
	 *
	 * @name serialize
	 * @type String
	 * @cat Ajax
	 */
	serialize: function() {
		return jQuery.param( this );
	},

	// DEPRECATED
	// This method no longer does anything - all script evaluation is
	// taken care of within the HTML injection methods.
	evalScripts: function(){}

});

// Attach a bunch of functions for handling common AJAX events

/**
 * Attach a function to be executed whenever an AJAX request begins
 * and there is none already active.
 *
 * @example $("#loading").ajaxStart(function(){
 *   $(this).show();
 * });
 * @desc Show a loading message whenever an AJAX request starts
 * (and none is already active).
 *
 * @name ajaxStart
 * @type jQuery
 * @param Function callback The function to execute.
 * @cat Ajax
 */

/**
 * Attach a function to be executed whenever all AJAX requests have ended.
 *
 * @example $("#loading").ajaxStop(function(){
 *   $(this).hide();
 * });
 * @desc Hide a loading message after all the AJAX requests have stopped.
 *
 * @name ajaxStop
 * @type jQuery
 * @param Function callback The function to execute.
 * @cat Ajax
 */

/**
 * Attach a function to be executed whenever an AJAX request completes.
 *
 * The XMLHttpRequest and settings used for that request are passed
 * as arguments to the callback.
 *
 * @example $("#msg").ajaxComplete(function(request, settings){
 *   $(this).append("<li>Request Complete.</li>");
 * });
 * @desc Show a message when an AJAX request completes.
 *
 * @name ajaxComplete
 * @type jQuery
 * @param Function callback The function to execute.
 * @cat Ajax
 */

/**
 * Attach a function to be executed whenever an AJAX request completes
 * successfully.
 *
 * The XMLHttpRequest and settings used for that request are passed
 * as arguments to the callback.
 *
 * @example $("#msg").ajaxSuccess(function(request, settings){
 *   $(this).append("<li>Successful Request!</li>");
 * });
 * @desc Show a message when an AJAX request completes successfully.
 *
 * @name ajaxSuccess
 * @type jQuery
 * @param Function callback The function to execute.
 * @cat Ajax
 */

/**
 * Attach a function to be executed whenever an AJAX request fails.
 *
 * The XMLHttpRequest and settings used for that request are passed
 * as arguments to the callback. A third argument, an exception object,
 * is passed if an exception occured while processing the request.
 *
 * @example $("#msg").ajaxError(function(request, settings){
 *   $(this).append("<li>Error requesting page " + settings.url + "</li>");
 * });
 * @desc Show a message when an AJAX request fails.
 *
 * @name ajaxError
 * @type jQuery
 * @param Function callback The function to execute.
 * @cat Ajax
 */
 
/**
 * Attach a function to be executed before an AJAX request is sent.
 *
 * The XMLHttpRequest and settings used for that request are passed
 * as arguments to the callback.
 *
 * @example $("#msg").ajaxSend(function(request, settings){
 *   $(this).append("<li>Starting request at " + settings.url + "</li>");
 * });
 * @desc Show a message before an AJAX request is sent.
 *
 * @name ajaxSend
 * @type jQuery
 * @param Function callback The function to execute.
 * @cat Ajax
 */
jQuery.each( "ajaxStart,ajaxStop,ajaxComplete,ajaxError,ajaxSuccess,ajaxSend".split(","), function(i,o){
	jQuery.fn[o] = function(f){
		return this.bind(o, f);
	};
});

jQuery.extend({

	/**
	 * Load a remote page using an HTTP GET request.
	 *
	 * This is an easy way to send a simple GET request to a server
	 * without having to use the more complex $.ajax function. It
	 * allows a single callback function to be specified that will
	 * be executed when the request is complete (and only if the response
	 * has a successful response code). If you need to have both error
	 * and success callbacks, you may want to use $.ajax.
	 *
	 * @example $.get("test.cgi");
	 *
	 * @example $.get("test.cgi", { name: "John", time: "2pm" } );
	 *
	 * @example $.get("test.cgi", function(data){
	 *   alert("Data Loaded: " + data);
	 * });
	 *
	 * @example $.get("test.cgi",
	 *   { name: "John", time: "2pm" },
	 *   function(data){
	 *     alert("Data Loaded: " + data);
	 *   }
	 * );
	 *
	 * @name $.get
	 * @type XMLHttpRequest
	 * @param String url The URL of the page to load.
	 * @param Map params (optional) Key/value pairs that will be sent to the server.
	 * @param Function callback (optional) A function to be executed whenever the data is loaded successfully.
	 * @cat Ajax
	 */
	get: function( url, data, callback, type, ifModified ) {
		// shift arguments if data argument was ommited
		if ( jQuery.isFunction( data ) ) {
			callback = data;
			data = null;
		}
		
		return jQuery.ajax({
			type: "GET",
			url: url,
			data: data,
			success: callback,
			dataType: type,
			ifModified: ifModified
		});
	},

	/**
	 * Load a remote page using an HTTP GET request, only if it hasn't
	 * been modified since it was last retrieved.
	 *
	 * @example $.getIfModified("test.html");
	 *
	 * @example $.getIfModified("test.html", { name: "John", time: "2pm" } );
	 *
	 * @example $.getIfModified("test.cgi", function(data){
	 *   alert("Data Loaded: " + data);
	 * });
	 *
	 * @example $.getifModified("test.cgi",
	 *   { name: "John", time: "2pm" },
	 *   function(data){
	 *     alert("Data Loaded: " + data);
	 *   }
	 * );
	 *
	 * @name $.getIfModified
	 * @type XMLHttpRequest
	 * @param String url The URL of the page to load.
	 * @param Map params (optional) Key/value pairs that will be sent to the server.
	 * @param Function callback (optional) A function to be executed whenever the data is loaded successfully.
	 * @cat Ajax
	 */
	// DEPRECATED
	getIfModified: function( url, data, callback, type ) {
		return jQuery.get(url, data, callback, type, 1);
	},

	/**
	 * Loads, and executes, a remote JavaScript file using an HTTP GET request.
	 *
	 * Warning: Safari <= 2.0.x is unable to evaluate scripts in a global
	 * context synchronously. If you load functions via getScript, make sure
	 * to call them after a delay.
	 *
	 * @example $.getScript("test.js");
	 *
	 * @example $.getScript("test.js", function(){
	 *   alert("Script loaded and executed.");
	 * });
	 *
	 * @name $.getScript
	 * @type XMLHttpRequest
	 * @param String url The URL of the page to load.
	 * @param Function callback (optional) A function to be executed whenever the data is loaded successfully.
	 * @cat Ajax
	 */
	getScript: function( url, callback ) {
		return jQuery.get(url, null, callback, "script");
	},

	/**
	 * Load JSON data using an HTTP GET request.
	 *
	 * @example $.getJSON("test.js", function(json){
	 *   alert("JSON Data: " + json.users[3].name);
	 * });
	 *
	 * @example $.getJSON("test.js",
	 *   { name: "John", time: "2pm" },
	 *   function(json){
	 *     alert("JSON Data: " + json.users[3].name);
	 *   }
	 * );
	 *
	 * @name $.getJSON
	 * @type XMLHttpRequest
	 * @param String url The URL of the page to load.
	 * @param Map params (optional) Key/value pairs that will be sent to the server.
	 * @param Function callback A function to be executed whenever the data is loaded successfully.
	 * @cat Ajax
	 */
	getJSON: function( url, data, callback ) {
		return jQuery.get(url, data, callback, "json");
	},

	/**
	 * Load a remote page using an HTTP POST request.
	 *
	 * @example $.post("test.cgi");
	 *
	 * @example $.post("test.cgi", { name: "John", time: "2pm" } );
	 *
	 * @example $.post("test.cgi", function(data){
	 *   alert("Data Loaded: " + data);
	 * });
	 *
	 * @example $.post("test.cgi",
	 *   { name: "John", time: "2pm" },
	 *   function(data){
	 *     alert("Data Loaded: " + data);
	 *   }
	 * );
	 *
	 * @name $.post
	 * @type XMLHttpRequest
	 * @param String url The URL of the page to load.
	 * @param Map params (optional) Key/value pairs that will be sent to the server.
	 * @param Function callback (optional) A function to be executed whenever the data is loaded successfully.
	 * @cat Ajax
	 */
	post: function( url, data, callback, type ) {
		if ( jQuery.isFunction( data ) ) {
			callback = data;
			data = {};
		}

		return jQuery.ajax({
			type: "POST",
			url: url,
			data: data,
			success: callback,
			dataType: type
		});
	},

	/**
	 * Set the timeout in milliseconds of all AJAX requests to a specific amount of time.
	 * This will make all future AJAX requests timeout after a specified amount
	 * of time.
	 *
	 * Set to null or 0 to disable timeouts (default).
	 *
	 * You can manually abort requests with the XMLHttpRequest's (returned by
	 * all ajax functions) abort() method.
	 *
	 * Deprecated. Use $.ajaxSetup instead.
	 *
	 * @example $.ajaxTimeout( 5000 );
	 * @desc Make all AJAX requests timeout after 5 seconds.
	 *
	 * @name $.ajaxTimeout
	 * @type undefined
	 * @param Number time How long before an AJAX request times out, in milliseconds.
	 * @cat Ajax
	 */
	// DEPRECATED
	ajaxTimeout: function( timeout ) {
		jQuery.ajaxSettings.timeout = timeout;
	},
	
	/**
	 * Setup global settings for AJAX requests.
	 *
	 * See $.ajax for a description of all available options.
	 *
	 * @example $.ajaxSetup( {
	 *   url: "/xmlhttp/",
	 *   global: false,
	 *   type: "POST"
	 * } );
	 * $.ajax({ data: myData });
	 * @desc Sets the defaults for AJAX requests to the url "/xmlhttp/",
	 * disables global handlers and uses POST instead of GET. The following
	 * AJAX requests then sends some data without having to set anything else.
	 *
	 * @name $.ajaxSetup
	 * @type undefined
	 * @param Map settings Key/value pairs to use for all AJAX requests
	 * @cat Ajax
	 */
	ajaxSetup: function( settings ) {
		jQuery.extend( jQuery.ajaxSettings, settings );
	},

	ajaxSettings: {
		global: true,
		type: "GET",
		timeout: 0,
		contentType: "application/x-www-form-urlencoded",
		processData: true,
		async: true,
		data: null
	},
	
	// Last-Modified header cache for next request
	lastModified: {},

	/**
	 * Load a remote page using an HTTP request.
	 *
	 * This is jQuery's low-level AJAX implementation. See $.get, $.post etc. for
	 * higher-level abstractions that are often easier to understand and use,
	 * but don't offer as much functionality (such as error callbacks).
	 *
	 * $.ajax() returns the XMLHttpRequest that it creates. In most cases you won't
	 * need that object to manipulate directly, but it is available if you need to
	 * abort the request manually.
	 *
	 * '''Note:''' If you specify the dataType option described below, make sure
	 * the server sends the correct MIME type in the response (eg. xml as "text/xml").
	 * Sending the wrong MIME type can lead to unexpected problems in your script.
	 * See [[Specifying the Data Type for AJAX Requests]] for more information.
	 *
	 * Supported datatypes are (see dataType option):
	 *
	 * "xml": Returns a XML document that can be processed via jQuery.
	 *
	 * "html": Returns HTML as plain text, included script tags are evaluated.
	 *
	 * "script": Evaluates the response as Javascript and returns it as plain text.
	 *
	 * "json": Evaluates the response as JSON and returns a Javascript Object
	 *
	 * $.ajax() takes one argument, an object of key/value pairs, that are
	 * used to initalize and handle the request. These are all the key/values that can
	 * be used:
	 *
	 * (String) url - The URL to request.
	 *
	 * (String) type - The type of request to make ("POST" or "GET"), default is "GET".
	 *
	 * (String) dataType - The type of data that you're expecting back from
	 * the server. No default: If the server sends xml, the responseXML, otherwise
	 * the responseText is passed to the success callback.
	 *
	 * (Boolean) ifModified - Allow the request to be successful only if the
	 * response has changed since the last request. This is done by checking the
	 * Last-Modified header. Default value is false, ignoring the header.
	 *
	 * (Number) timeout - Local timeout in milliseconds to override global timeout, eg. to give a
	 * single request a longer timeout while all others timeout after 1 second.
	 * See $.ajaxTimeout() for global timeouts.
	 *
	 * (Boolean) global - Whether to trigger global AJAX event handlers for
	 * this request, default is true. Set to false to prevent that global handlers
	 * like ajaxStart or ajaxStop are triggered.
	 *
	 * (Function) error - A function to be called if the request fails. The
	 * function gets passed tree arguments: The XMLHttpRequest object, a
	 * string describing the type of error that occurred and an optional
	 * exception object, if one occured.
	 *
	 * (Function) success - A function to be called if the request succeeds. The
	 * function gets passed one argument: The data returned from the server,
	 * formatted according to the 'dataType' parameter.
	 *
	 * (Function) complete - A function to be called when the request finishes. The
	 * function gets passed two arguments: The XMLHttpRequest object and a
	 * string describing the type of success of the request.
	 *
 	 * (Object|String) data - Data to be sent to the server. Converted to a query
	 * string, if not already a string. Is appended to the url for GET-requests.
	 * See processData option to prevent this automatic processing.
	 *
	 * (String) contentType - When sending data to the server, use this content-type.
	 * Default is "application/x-www-form-urlencoded", which is fine for most cases.
	 *
	 * (Boolean) processData - By default, data passed in to the data option as an object
	 * other as string will be processed and transformed into a query string, fitting to
	 * the default content-type "application/x-www-form-urlencoded". If you want to send
	 * DOMDocuments, set this option to false.
	 *
	 * (Boolean) async - By default, all requests are sent asynchronous (set to true).
	 * If you need synchronous requests, set this option to false.
	 *
	 * (Function) beforeSend - A pre-callback to set custom headers etc., the
	 * XMLHttpRequest is passed as the only argument.
	 *
	 * @example $.ajax({
	 *   type: "GET",
	 *   url: "test.js",
	 *   dataType: "script"
	 * })
	 * @desc Load and execute a JavaScript file.
	 *
	 * @example $.ajax({
	 *   type: "POST",
	 *   url: "some.php",
	 *   data: "name=John&location=Boston",
	 *   success: function(msg){
	 *     alert( "Data Saved: " + msg );
	 *   }
	 * });
	 * @desc Save some data to the server and notify the user once its complete.
	 *
	 * @example var html = $.ajax({
	 *  url: "some.php",
	 *  async: false
	 * }).responseText;
	 * @desc Loads data synchronously. Blocks the browser while the requests is active.
	 * It is better to block user interaction by other means when synchronization is
	 * necessary.
	 *
	 * @example var xmlDocument = [create xml document];
	 * $.ajax({
	 *   url: "page.php",
	 *   processData: false,
	 *   data: xmlDocument,
	 *   success: handleResponse
	 * });
	 * @desc Sends an xml document as data to the server. By setting the processData
	 * option to false, the automatic conversion of data to strings is prevented.
	 * 
	 * @name $.ajax
	 * @type XMLHttpRequest
	 * @param Map properties Key/value pairs to initialize the request with.
	 * @cat Ajax
	 * @see ajaxSetup(Map)
	 */
	ajax: function( s ) {
		// Extend the settings, but re-extend 's' so that it can be
		// checked again later (in the test suite, specifically)
		s = jQuery.extend(true, s, jQuery.extend(true, {}, jQuery.ajaxSettings, s));

		// if data available
		if ( s.data ) {
			// convert data if not already a string
			if ( s.processData && typeof s.data != "string" )
				s.data = jQuery.param(s.data);

			// append data to url for get requests
			if ( s.type.toLowerCase() == "get" ) {
				// "?" + data or "&" + data (in case there are already params)
				s.url += (s.url.indexOf("?") > -1 ? "&" : "?") + s.data;

				// IE likes to send both get and post data, prevent this
				s.data = null;
			}
		}

		// Watch for a new set of requests
		if ( s.global && ! jQuery.active++ )
			jQuery.event.trigger( "ajaxStart" );

		var requestDone = false;

		// Create the request object; Microsoft failed to properly
		// implement the XMLHttpRequest in IE7, so we use the ActiveXObject when it is available
		var xml = window.ActiveXObject ? new ActiveXObject("Microsoft.XMLHTTP") : new XMLHttpRequest();

		// Open the socket
		xml.open(s.type, s.url, s.async);

		// Set the correct header, if data is being sent
		if ( s.data )
			xml.setRequestHeader("Content-Type", s.contentType);

		// Set the If-Modified-Since header, if ifModified mode.
		if ( s.ifModified )
			xml.setRequestHeader("If-Modified-Since",
				jQuery.lastModified[s.url] || "Thu, 01 Jan 1970 00:00:00 GMT" );

		// Set header so the called script knows that it's an XMLHttpRequest
		xml.setRequestHeader("X-Requested-With", "XMLHttpRequest");

		// Allow custom headers/mimetypes
		if( s.beforeSend )
			s.beforeSend(xml);
			
		if ( s.global )
		    jQuery.event.trigger("ajaxSend", [xml, s]);

		// Wait for a response to come back
		var onreadystatechange = function(isTimeout){
			// The transfer is complete and the data is available, or the request timed out
			if ( !requestDone && xml && (xml.readyState == 4 || isTimeout == "timeout") ) {
				requestDone = true;
				
				// clear poll interval
				if (ival) {
					clearInterval(ival);
					ival = null;
				}
				
				var status = isTimeout == "timeout" && "timeout" ||
					!jQuery.httpSuccess( xml ) && "error" ||
					s.ifModified && jQuery.httpNotModified( xml, 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)
						var data = jQuery.httpData( xml, s.dataType );
					} catch(e) {
						status = "parsererror";
					}
				}

				// Make sure that the request was successful or notmodified
				if ( status == "success" ) {
					// Cache Last-Modified header, if ifModified mode.
					var modRes;
					try {
						modRes = xml.getResponseHeader("Last-Modified");
					} catch(e) {} // swallow exception thrown by FF if header is not available
	
					if ( s.ifModified && modRes )
						jQuery.lastModified[s.url] = modRes;
	
					// If a local callback was specified, fire it and pass it the data
					if ( s.success )
						s.success( data, status );
	
					// Fire the global callback
					if ( s.global )
						jQuery.event.trigger( "ajaxSuccess", [xml, s] );
				} else
					jQuery.handleError(s, xml, status);

				// The request was completed
				if( s.global )
					jQuery.event.trigger( "ajaxComplete", [xml, s] );

				// Handle the global AJAX counter
				if ( s.global && ! --jQuery.active )
					jQuery.event.trigger( "ajaxStop" );

				// Process result
				if ( s.complete )
					s.complete(xml, status);

				// Stop memory leaks
				if(s.async)
					xml = null;
			}
		};
		
		if ( s.async ) {
			// don't attach the handler to the request, just poll it instead
			var ival = setInterval(onreadystatechange, 13); 

			// Timeout checker
			if ( s.timeout > 0 )
				setTimeout(function(){
					// Check to see if the request is still happening
					if ( xml ) {
						// Cancel the request
						xml.abort();
	
						if( !requestDone )
							onreadystatechange( "timeout" );
					}
				}, s.timeout);
		}
			
		// Send the data
		try {
			xml.send(s.data);
		} catch(e) {
			jQuery.handleError(s, xml, null, e);
		}
		
		// firefox 1.5 doesn't fire statechange for sync requests
		if ( !s.async )
			onreadystatechange();
		
		// return XMLHttpRequest to allow aborting the request etc.
		return xml;
	},

	handleError: function( s, xml, status, e ) {
		// If a local callback was specified, fire it
		if ( s.error ) s.error( xml, status, e );

		// Fire the global callback
		if ( s.global )
			jQuery.event.trigger( "ajaxError", [xml, s, e] );
	},

	// Counter for holding the number of active queries
	active: 0,

	// Determines if an XMLHttpRequest was successful or not
	httpSuccess: function( r ) {
		try {
			return !r.status && location.protocol == "file:" ||
				( r.status >= 200 && r.status < 300 ) || r.status == 304 ||
				jQuery.browser.safari && r.status == undefined;
		} catch(e){}
		return false;
	},

	// Determines if an XMLHttpRequest returns NotModified
	httpNotModified: function( xml, url ) {
		try {
			var xmlRes = xml.getResponseHeader("Last-Modified");

			// Firefox always returns 200. check Last-Modified date
			return xml.status == 304 || xmlRes == jQuery.lastModified[url] ||
				jQuery.browser.safari && xml.status == undefined;
		} catch(e){}
		return false;
	},

	/* Get the data out of an XMLHttpRequest.
	 * Return parsed XML if content-type header is "xml" and type is "xml" or omitted,
	 * otherwise return plain text.
	 * (String) data - The type of data that you're expecting back,
	 * (e.g. "xml", "html", "script")
	 */
	httpData: function( r, type ) {
		var ct = r.getResponseHeader("content-type");
		var xml = type == "xml" || !type && ct && ct.indexOf("xml") >= 0;
		data = xml ? r.responseXML : r.responseText;

		if ( xml && data.documentElement.tagName == "parsererror" )
			throw "parsererror";

		// If the type is "script", eval it in global context
		if ( type == "script" )
			jQuery.globalEval( data );

		// Get the JavaScript object, if JSON is used.
		if ( type == "json" )
			data = eval("(" + data + ")");

		return data;
	},

	// Serialize an array of form elements or a set of
	// key/values into a query string
	param: function( a ) {
		var s = [];

		// If an array was passed in, assume that it is an array
		// of form elements
		if ( a.constructor == Array || a.jquery )
			// Serialize the form elements
			jQuery.each( a, function(){
				s.push( encodeURIComponent(this.name) + "=" + encodeURIComponent( this.value ) );
			});

		// Otherwise, assume that it's an object of key/value pairs
		else
			// Serialize the key/values
			for ( var j in a )
				// If the value is an array then the key names need to be repeated
				if ( a[j] && a[j].constructor == Array )
					jQuery.each( a[j], function(){
						s.push( encodeURIComponent(j) + "=" + encodeURIComponent( this ) );
					});
				else
					s.push( encodeURIComponent(j) + "=" + encodeURIComponent( a[j] ) );

		// Return the resulting serialization
		return s.join("&");
	}

});