/trunk/wb/include/yui/connection/connection.js - WB 2.08.x - Tracking

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       /*
       Copyright (c) 2007, Yahoo! Inc. All rights reserved.
       Code licensed under the BSD License:
       http://developer.yahoo.net/yui/license.txt
       version: 2.4.1
       */
       /**
        * The Connection Manager provides a simplified interface to the XMLHttpRequest
        * object.  It handles cross-browser instantiantion of XMLHttpRequest, negotiates the
        * interactive states and server response, returning the results to a pre-defined
        * callback you create.
+       *
        * @namespace YAHOO.util
        * @module connection
        * @requires yahoo
        * @requires event
        */
       /**
        * The Connection Manager singleton provides methods for creating and managing
        * asynchronous transactions.
+       *
        * @class Connect
        */
       YAHOO.util.Connect =
+      {
         /**
          * @description Array of MSFT ActiveX ids for XMLHttpRequest.
          * @property _msxml_progid
          * @private
          * @static
          * @type array
          */
       	_msxml_progid:[
       		'Microsoft.XMLHTTP',
       		'MSXML2.XMLHTTP.3.0',
       		'MSXML2.XMLHTTP'
       		],
         /**
          * @description Object literal of HTTP header(s)
          * @property _http_header
          * @private
          * @static
          * @type object
          */
       	_http_headers:{},
         /**
          * @description Determines if HTTP headers are set.
          * @property _has_http_headers
          * @private
          * @static
          * @type boolean
          */
       	_has_http_headers:false,
        /**
         * @description Determines if a default header of
         * Content-Type of 'application/x-www-form-urlencoded'
         * will be added to any client HTTP headers sent for POST
         * transactions.
         * @property _use_default_post_header
         * @private
         * @static
         * @type boolean
         */
           _use_default_post_header:true,
        /**
         * @description The default header used for POST transactions.
         * @property _default_post_header
         * @private
         * @static
         * @type boolean
         */
           _default_post_header:'application/x-www-form-urlencoded; charset=UTF-8',
        /**
         * @description The default header used for transactions involving the
         * use of HTML forms.
         * @property _default_form_header
         * @private
         * @static
         * @type boolean
         */
           _default_form_header:'application/x-www-form-urlencoded',
        /**
         * @description Determines if a default header of
         * 'X-Requested-With: XMLHttpRequest'
         * will be added to each transaction.
         * @property _use_default_xhr_header
         * @private
         * @static
         * @type boolean
         */
           _use_default_xhr_header:true,
        /**
         * @description The default header value for the label
         * "X-Requested-With".  This is sent with each
         * transaction, by default, to identify the
         * request as being made by YUI Connection Manager.
         * @property _default_xhr_header
         * @private
         * @static
         * @type boolean
         */
           _default_xhr_header:'XMLHttpRequest',
        /**
         * @description Determines if custom, default headers
         * are set for each transaction.
         * @property _has_default_header
         * @private
         * @static
         * @type boolean
         */
           _has_default_headers:true,
        /**
         * @description Determines if custom, default headers
         * are set for each transaction.
         * @property _has_default_header
         * @private
         * @static
         * @type boolean
         */
           _default_headers:{},
        /**
         * @description Property modified by setForm() to determine if the data
         * should be submitted as an HTML form.
         * @property _isFormSubmit
         * @private
         * @static
         * @type boolean
         */
           _isFormSubmit:false,
        /**
         * @description Property modified by setForm() to determine if a file(s)
         * upload is expected.
         * @property _isFileUpload
         * @private
         * @static
         * @type boolean
         */
           _isFileUpload:false,
        /**
         * @description Property modified by setForm() to set a reference to the HTML
         * form node if the desired action is file upload.
         * @property _formNode
         * @private
         * @static
         * @type object
         */
           _formNode:null,
        /**
         * @description Property modified by setForm() to set the HTML form data
         * for each transaction.
         * @property _sFormData
         * @private
         * @static
         * @type string
         */
           _sFormData:null,
        /**
         * @description Collection of polling references to the polling mechanism in handleReadyState.
         * @property _poll
         * @private
         * @static
         * @type object
         */
           _poll:{},
        /**
         * @description Queue of timeout values for each transaction callback with a defined timeout value.
         * @property _timeOut
         * @private
         * @static
         * @type object
         */
           _timeOut:{},
         /**
          * @description The polling frequency, in milliseconds, for HandleReadyState.
          * when attempting to determine a transaction's XHR readyState.
          * The default is 50 milliseconds.
          * @property _polling_interval
          * @private
          * @static
          * @type int
          */
            _polling_interval:50,
         /**
          * @description A transaction counter that increments the transaction id for each transaction.
          * @property _transaction_id
          * @private
          * @static
          * @type int
          */
            _transaction_id:0,
         /**
          * @description Tracks the name-value pair of the "clicked" submit button if multiple submit
          * buttons are present in an HTML form; and, if YAHOO.util.Event is available.
          * @property _submitElementValue
          * @private
          * @static
          * @type string
          */
       	 _submitElementValue:null,
         /**
          * @description Determines whether YAHOO.util.Event is available and returns true or false.
          * If true, an event listener is bound at the document level to trap click events that
          * resolve to a target type of "Submit".  This listener will enable setForm() to determine
          * the clicked "Submit" value in a multi-Submit button, HTML form.
          * @property _hasSubmitListener
          * @private
          * @static
          */
       	 _hasSubmitListener:(function()
+      	 {
       		if(YAHOO.util.Event){
       			YAHOO.util.Event.addListener(
       				document,
       				'click',
       				function(e){
       					var obj = YAHOO.util.Event.getTarget(e);
       					if(obj.type && obj.type.toLowerCase() == 'submit'){
       						YAHOO.util.Connect._submitElementValue = encodeURIComponent(obj.name) + "=" + encodeURIComponent(obj.value);
+      					}
       				});
       			return true;
+      	    }
       	    return false;
       	 })(),
         /**
          * @description Custom event that fires at the start of a transaction
          * @property startEvent
          * @private
          * @static
          * @type CustomEvent
          */
       	startEvent: new YAHOO.util.CustomEvent('start'),
         /**
          * @description Custom event that fires when a transaction response has completed.
          * @property completeEvent
          * @private
          * @static
          * @type CustomEvent
          */
       	completeEvent: new YAHOO.util.CustomEvent('complete'),
         /**
          * @description Custom event that fires when handleTransactionResponse() determines a
          * response in the HTTP 2xx range.
          * @property successEvent
          * @private
          * @static
          * @type CustomEvent
          */
       	successEvent: new YAHOO.util.CustomEvent('success'),
         /**
          * @description Custom event that fires when handleTransactionResponse() determines a
          * response in the HTTP 4xx/5xx range.
          * @property failureEvent
          * @private
          * @static
          * @type CustomEvent
          */
       	failureEvent: new YAHOO.util.CustomEvent('failure'),
         /**
          * @description Custom event that fires when handleTransactionResponse() determines a
          * response in the HTTP 4xx/5xx range.
          * @property failureEvent
          * @private
          * @static
          * @type CustomEvent
          */
       	uploadEvent: new YAHOO.util.CustomEvent('upload'),
         /**
          * @description Custom event that fires when a transaction is successfully aborted.
          * @property abortEvent
          * @private
          * @static
          * @type CustomEvent
          */
       	abortEvent: new YAHOO.util.CustomEvent('abort'),
         /**
          * @description A reference table that maps callback custom events members to its specific
          * event name.
          * @property _customEvents
          * @private
          * @static
          * @type object
          */
       	_customEvents:
+      	{
       		onStart:['startEvent', 'start'],
       		onComplete:['completeEvent', 'complete'],
       		onSuccess:['successEvent', 'success'],
       		onFailure:['failureEvent', 'failure'],
       		onUpload:['uploadEvent', 'upload'],
       		onAbort:['abortEvent', 'abort']
       	},
         /**
          * @description Member to add an ActiveX id to the existing xml_progid array.
          * In the event(unlikely) a new ActiveX id is introduced, it can be added
          * without internal code modifications.
          * @method setProgId
          * @public
          * @static
          * @param {string} id The ActiveX id to be added to initialize the XHR object.
          * @return void
          */
       	setProgId:function(id)
+      	{
       		this._msxml_progid.unshift(id);
       	},
         /**
          * @description Member to override the default POST header.
          * @method setDefaultPostHeader
          * @public
          * @static
          * @param {boolean} b Set and use default header - true or false .
          * @return void
          */
       	setDefaultPostHeader:function(b)
+      	{
       		if(typeof b == 'string'){
       			this._default_post_header = b;
+      		}
       		else if(typeof b == 'boolean'){
       			this._use_default_post_header = b;
+      		}
       	},
         /**
          * @description Member to override the default transaction header..
          * @method setDefaultXhrHeader
          * @public
          * @static
          * @param {boolean} b Set and use default header - true or false .
          * @return void
          */
       	setDefaultXhrHeader:function(b)
+      	{
       		if(typeof b == 'string'){
       			this._default_xhr_header = b;
+      		}
       		else{
       			this._use_default_xhr_header = b;
+      		}
       	},
         /**
          * @description Member to modify the default polling interval.
          * @method setPollingInterval
          * @public
          * @static
          * @param {int} i The polling interval in milliseconds.
          * @return void
          */
       	setPollingInterval:function(i)
+      	{
       		if(typeof i == 'number' && isFinite(i)){
       			this._polling_interval = i;
+      		}
       	},
         /**
          * @description Instantiates a XMLHttpRequest object and returns an object with two properties:
          * the XMLHttpRequest instance and the transaction id.
          * @method createXhrObject
          * @private
          * @static
          * @param {int} transactionId Property containing the transaction id for this transaction.
          * @return object
          */
       	createXhrObject:function(transactionId)
+      	{
       		var obj,http;
       		try
+      		{
       			// Instantiates XMLHttpRequest in non-IE browsers and assigns to http.
       			http = new XMLHttpRequest();
       			//  Object literal with http and tId properties
       			obj = { conn:http, tId:transactionId };
+      		}
       		catch(e)
+      		{
       			for(var i=0; i<this._msxml_progid.length; ++i){
       				try
+      				{
       					// Instantiates XMLHttpRequest for IE and assign to http
       					http = new ActiveXObject(this._msxml_progid[i]);
       					//  Object literal with conn and tId properties
       					obj = { conn:http, tId:transactionId };
       					break;
+      				}
       				catch(e){}
+      			}
+      		}
       		finally
+      		{
       			return obj;
+      		}
       	},
         /**
          * @description This method is called by asyncRequest to create a
          * valid connection object for the transaction.  It also passes a
          * transaction id and increments the transaction id counter.
          * @method getConnectionObject
          * @private
          * @static
          * @return {object}
          */
       	getConnectionObject:function(isFileUpload)
+      	{
       		var o;
       		var tId = this._transaction_id;
       		try
+      		{
       			if(!isFileUpload){
       				o = this.createXhrObject(tId);
+      			}
       			else{
       				o = {};
       				o.tId = tId;
       				o.isUpload = true;
+      			}
       			if(o){
       				this._transaction_id++;
+      			}
+      		}
       		catch(e){}
       		finally
+      		{
       			return o;
+      		}
       	},
         /**
          * @description Method for initiating an asynchronous request via the XHR object.
          * @method asyncRequest
          * @public
          * @static
          * @param {string} method HTTP transaction method
          * @param {string} uri Fully qualified path of resource
          * @param {callback} callback User-defined callback function or object
          * @param {string} postData POST body
          * @return {object} Returns the connection object
          */
       	asyncRequest:function(method, uri, callback, postData)
+      	{
       		var o = (this._isFileUpload)?this.getConnectionObject(true):this.getConnectionObject();
       		var args = (callback && callback.argument)?callback.argument:null;
       		if(!o){
       			return null;
+      		}
       		else{
       			// Intialize any transaction-specific custom events, if provided.
       			if(callback && callback.customevents){
       				this.initCustomEvents(o, callback);
+      			}
       			if(this._isFormSubmit){
       				if(this._isFileUpload){
       					this.uploadFile(o, callback, uri, postData);
       					return o;
+      				}
       				// If the specified HTTP method is GET, setForm() will return an
       				// encoded string that is concatenated to the uri to
       				// create a querystring.
       				if(method.toUpperCase() == 'GET'){
       					if(this._sFormData.length !== 0){
       						// If the URI already contains a querystring, append an ampersand
       						// and then concatenate _sFormData to the URI.
       						uri += ((uri.indexOf('?') == -1)?'?':'&') + this._sFormData;
+      					}
+      				}
       				else if(method.toUpperCase() == 'POST'){
       					// If POST data exist in addition to the HTML form data,
       					// it will be concatenated to the form data.
       					postData = postData?this._sFormData + "&" + postData:this._sFormData;
+      				}
+      			}
       			if(method.toUpperCase() == 'GET' && (callback && callback.cache === false)){
       				// If callback.cache is defined and set to false, a
       				// timestamp value will be added to the querystring.
       				uri += ((uri.indexOf('?') == -1)?'?':'&') + "rnd=" + new Date().valueOf().toString();
+      			}
       			o.conn.open(method, uri, true);
       			// Each transaction will automatically include a custom header of
       			// "X-Requested-With: XMLHttpRequest" to identify the request as
       			// having originated from Connection Manager.
       			if(this._use_default_xhr_header){
       				if(!this._default_headers['X-Requested-With']){
       					this.initHeader('X-Requested-With', this._default_xhr_header, true);
+      				}
+      			}
       			//If the transaction method is POST and the POST header value is set to true
       			//or a custom value, initalize the Content-Type header to this value.
       			if((method.toUpperCase() == 'POST' && this._use_default_post_header) && this._isFormSubmit === false){
       				this.initHeader('Content-Type', this._default_post_header);
+      			}
       			//Initialize all default and custom HTTP headers,
       			if(this._has_default_headers || this._has_http_headers){
       				this.setHeader(o);
+      			}
       			this.handleReadyState(o, callback);
       			o.conn.send(postData || null);
       			// Reset the HTML form data and state properties as
       			// soon as the data are submitted.
       			if(this._isFormSubmit === true){
       				this.resetFormState();
+      			}
       			// Fire global custom event -- startEvent
       			this.startEvent.fire(o, args);
       			if(o.startEvent){
       				// Fire transaction custom event -- startEvent
       				o.startEvent.fire(o, args);
+      			}
       			return o;
+      		}
       	},
         /**
          * @description This method creates and subscribes custom events,
          * specific to each transaction
          * @method initCustomEvents
          * @private
          * @static
          * @param {object} o The connection object
          * @param {callback} callback The user-defined callback object
          * @return {void}
          */
       	initCustomEvents:function(o, callback)
+      	{
       		// Enumerate through callback.customevents members and bind/subscribe
       		// events that match in the _customEvents table.
       		for(var prop in callback.customevents){
       			if(this._customEvents[prop][0]){
       				// Create the custom event
       				o[this._customEvents[prop][0]] = new YAHOO.util.CustomEvent(this._customEvents[prop][1], (callback.scope)?callback.scope:null);
       				// Subscribe the custom event
       				o[this._customEvents[prop][0]].subscribe(callback.customevents[prop]);
+      			}
+      		}
       	},
         /**
          * @description This method serves as a timer that polls the XHR object's readyState
          * property during a transaction, instead of binding a callback to the
          * onreadystatechange event.  Upon readyState 4, handleTransactionResponse
          * will process the response, and the timer will be cleared.
          * @method handleReadyState
          * @private
          * @static
          * @param {object} o The connection object
          * @param {callback} callback The user-defined callback object
          * @return {void}
          */
           handleReadyState:function(o, callback)
+          {
       		var oConn = this;
       		var args = (callback && callback.argument)?callback.argument:null;
       		if(callback && callback.timeout){
       			this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
+      		}
       		this._poll[o.tId] = window.setInterval(
       			function(){
       				if(o.conn && o.conn.readyState === 4){
       					// Clear the polling interval for the transaction
       					// and remove the reference from _poll.
       					window.clearInterval(oConn._poll[o.tId]);
       					delete oConn._poll[o.tId];
       					if(callback && callback.timeout){
       						window.clearTimeout(oConn._timeOut[o.tId]);
       						delete oConn._timeOut[o.tId];
+      					}
       					// Fire global custom event -- completeEvent
       					oConn.completeEvent.fire(o, args);
       					if(o.completeEvent){
       						// Fire transaction custom event -- completeEvent
       						o.completeEvent.fire(o, args);
+      					}
       					oConn.handleTransactionResponse(o, callback);
+      				}
+      			}
       		,this._polling_interval);
           },
         /**
          * @description This method attempts to interpret the server response and
          * determine whether the transaction was successful, or if an error or
          * exception was encountered.
          * @method handleTransactionResponse
          * @private
          * @static
          * @param {object} o The connection object
          * @param {object} callback The user-defined callback object
          * @param {boolean} isAbort Determines if the transaction was terminated via abort().
          * @return {void}
          */
           handleTransactionResponse:function(o, callback, isAbort)
+          {
       		var httpStatus, responseObject;
       		var args = (callback && callback.argument)?callback.argument:null;
       		try
+      		{
       			if(o.conn.status !== undefined && o.conn.status !== 0){
       				httpStatus = o.conn.status;
+      			}
       			else{
       				httpStatus = 13030;
+      			}
+      		}
       		catch(e){
       			 // 13030 is a custom code to indicate the condition -- in Mozilla/FF --
       			 // when the XHR object's status and statusText properties are
       			 // unavailable, and a query attempt throws an exception.
       			httpStatus = 13030;
+      		}
       		if(httpStatus >= 200 && httpStatus < 300 || httpStatus === 1223){
       			responseObject = this.createResponseObject(o, args);
       			if(callback && callback.success){
       				if(!callback.scope){
       					callback.success(responseObject);
+      				}
       				else{
       					// If a scope property is defined, the callback will be fired from
       					// the context of the object.
       					callback.success.apply(callback.scope, [responseObject]);
+      				}
+      			}
       			// Fire global custom event -- successEvent
       			this.successEvent.fire(responseObject);
       			if(o.successEvent){
       				// Fire transaction custom event -- successEvent
       				o.successEvent.fire(responseObject);
+      			}
+      		}
       		else{
       			switch(httpStatus){
       				// The following cases are wininet.dll error codes that may be encountered.
       				case 12002: // Server timeout
       				case 12029: // 12029 to 12031 correspond to dropped connections.
       				case 12030:
       				case 12031:
       				case 12152: // Connection closed by server.
       				case 13030: // See above comments for variable status.
       					responseObject = this.createExceptionObject(o.tId, args, (isAbort?isAbort:false));
       					if(callback && callback.failure){
       						if(!callback.scope){
       							callback.failure(responseObject);
+      						}
       						else{
       							callback.failure.apply(callback.scope, [responseObject]);
+      						}
+      					}
       					break;
       				default:
       					responseObject = this.createResponseObject(o, args);
       					if(callback && callback.failure){
       						if(!callback.scope){
       							callback.failure(responseObject);
+      						}
       						else{
       							callback.failure.apply(callback.scope, [responseObject]);
+      						}
+      					}
+      			}
       			// Fire global custom event -- failureEvent
       			this.failureEvent.fire(responseObject);
       			if(o.failureEvent){
       				// Fire transaction custom event -- failureEvent
       				o.failureEvent.fire(responseObject);
+      			}
+      		}
       		this.releaseObject(o);
       		responseObject = null;
           },
         /**
          * @description This method evaluates the server response, creates and returns the results via
          * its properties.  Success and failure cases will differ in the response
          * object's property values.
          * @method createResponseObject
          * @private
          * @static
          * @param {object} o The connection object
          * @param {callbackArg} callbackArg The user-defined argument or arguments to be passed to the callback
          * @return {object}
          */
           createResponseObject:function(o, callbackArg)
+          {
       		var obj = {};
       		var headerObj = {};
       		try
+      		{
       			var headerStr = o.conn.getAllResponseHeaders();
       			var header = headerStr.split('\n');
       			for(var i=0; i<header.length; i++){
       				var delimitPos = header[i].indexOf(':');
       				if(delimitPos != -1){
       					headerObj[header[i].substring(0,delimitPos)] = header[i].substring(delimitPos+2);
+      				}
+      			}
+      		}
       		catch(e){}
       		obj.tId = o.tId;
       		// Normalize IE's response to HTTP 204 when Win error 1223.
       		obj.status = (o.conn.status == 1223)?204:o.conn.status;
       		// Normalize IE's statusText to "No Content" instead of "Unknown".
       		obj.statusText = (o.conn.status == 1223)?"No Content":o.conn.statusText;
       		obj.getResponseHeader = headerObj;
       		obj.getAllResponseHeaders = headerStr;
       		obj.responseText = o.conn.responseText;
       		obj.responseXML = o.conn.responseXML;
       		if(callbackArg){
       			obj.argument = callbackArg;
+      		}
       		return obj;
           },
         /**
          * @description If a transaction cannot be completed due to dropped or closed connections,
          * there may be not be enough information to build a full response object.
          * The failure callback will be fired and this specific condition can be identified
          * by a status property value of 0.
+         *
          * If an abort was successful, the status property will report a value of -1.
+         *
          * @method createExceptionObject
          * @private
          * @static
          * @param {int} tId The Transaction Id
          * @param {callbackArg} callbackArg The user-defined argument or arguments to be passed to the callback
          * @param {boolean} isAbort Determines if the exception case is caused by a transaction abort
          * @return {object}
          */
           createExceptionObject:function(tId, callbackArg, isAbort)
+          {
       		var COMM_CODE = 0;
       		var COMM_ERROR = 'communication failure';
       		var ABORT_CODE = -1;
       		var ABORT_ERROR = 'transaction aborted';
       		var obj = {};
       		obj.tId = tId;
       		if(isAbort){
       			obj.status = ABORT_CODE;
       			obj.statusText = ABORT_ERROR;
+      		}
       		else{
       			obj.status = COMM_CODE;
       			obj.statusText = COMM_ERROR;
+      		}
       		if(callbackArg){
       			obj.argument = callbackArg;
+      		}
       		return obj;
           },
         /**
          * @description Method that initializes the custom HTTP headers for the each transaction.
          * @method initHeader
          * @public
          * @static
          * @param {string} label The HTTP header label
          * @param {string} value The HTTP header value
          * @param {string} isDefault Determines if the specific header is a default header
          * automatically sent with each transaction.
          * @return {void}
          */
       	initHeader:function(label, value, isDefault)
+      	{
       		var headerObj = (isDefault)?this._default_headers:this._http_headers;
       		headerObj[label] = value;
       		if(isDefault){
       			this._has_default_headers = true;
+      		}
       		else{
       			this._has_http_headers = true;
+      		}
       	},
         /**
          * @description Accessor that sets the HTTP headers for each transaction.
          * @method setHeader
          * @private
          * @static
          * @param {object} o The connection object for the transaction.
          * @return {void}
          */
       	setHeader:function(o)
+      	{
       		if(this._has_default_headers){
       			for(var prop in this._default_headers){
       				if(YAHOO.lang.hasOwnProperty(this._default_headers, prop)){
       					o.conn.setRequestHeader(prop, this._default_headers[prop]);
+      				}
+      			}
+      		}
       		if(this._has_http_headers){
       			for(var prop in this._http_headers){
       				if(YAHOO.lang.hasOwnProperty(this._http_headers, prop)){
       					o.conn.setRequestHeader(prop, this._http_headers[prop]);
+      				}
+      			}
       			delete this._http_headers;
       			this._http_headers = {};
       			this._has_http_headers = false;
+      		}
       	},
         /**
          * @description Resets the default HTTP headers object
          * @method resetDefaultHeaders
          * @public
          * @static
          * @return {void}
          */
       	resetDefaultHeaders:function(){
       		delete this._default_headers;
       		this._default_headers = {};
       		this._has_default_headers = false;
       	},
         /**
          * @description This method assembles the form label and value pairs and
          * constructs an encoded string.
          * asyncRequest() will automatically initialize the transaction with a
          * a HTTP header Content-Type of application/x-www-form-urlencoded.
          * @method setForm
          * @public
          * @static
          * @param {string || object} form id or name attribute, or form object.
          * @param {boolean} optional enable file upload.
          * @param {boolean} optional enable file upload over SSL in IE only.
          * @return {string} string of the HTML form field name and value pairs..
          */
       	setForm:function(formId, isUpload, secureUri)
+      	{
       		// reset the HTML form data and state properties
       		this.resetFormState();
       		var oForm;
       		if(typeof formId == 'string'){
       			// Determine if the argument is a form id or a form name.
       			// Note form name usage is deprecated, but supported
       			// here for backward compatibility.
       			oForm = (document.getElementById(formId) || document.forms[formId]);
+      		}
       		else if(typeof formId == 'object'){
       			// Treat argument as an HTML form object.
       			oForm = formId;
+      		}
       		else{
       			return;
+      		}
       		// If the isUpload argument is true, setForm will call createFrame to initialize
       		// an iframe as the form target.
       		//
       		// The argument secureURI is also required by IE in SSL environments
       		// where the secureURI string is a fully qualified HTTP path, used to set the source
       		// of the iframe, to a stub resource in the same domain.
       		if(isUpload){
       			// Create iframe in preparation for file upload.
       			var io = this.createFrame(secureUri?secureUri:null);
       			// Set form reference and file upload properties to true.
       			this._isFormSubmit = true;
       			this._isFileUpload = true;
       			this._formNode = oForm;
       			return;
+      		}
       		var oElement, oName, oValue, oDisabled;
       		var hasSubmit = false;
       		// Iterate over the form elements collection to construct the
       		// label-value pairs.
       		for (var i=0; i<oForm.elements.length; i++){
       			oElement = oForm.elements[i];
       			oDisabled = oElement.disabled;
       			oName = oElement.name;
       			oValue = oElement.value;
       			// Do not submit fields that are disabled or
       			// do not have a name attribute value.
       			if(!oDisabled && oName)
+      			{
       				switch(oElement.type)
+      				{
       					case 'select-one':
       					case 'select-multiple':
       						for(var j=0; j<oElement.options.length; j++){
       							if(oElement.options[j].selected){
       								if(window.ActiveXObject){
       									this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oElement.options[j].attributes['value'].specified?oElement.options[j].value:oElement.options[j].text) + '&';
+      								}
       								else{
       									this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oElement.options[j].hasAttribute('value')?oElement.options[j].value:oElement.options[j].text) + '&';
+      								}
+      							}
+      						}
       						break;
       					case 'radio':
       					case 'checkbox':
       						if(oElement.checked){
       							this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
+      						}
       						break;
       					case 'file':
       						// stub case as XMLHttpRequest will only send the file path as a string.
       					case undefined:
       						// stub case for fieldset element which returns undefined.
       					case 'reset':
       						// stub case for input type reset button.
       					case 'button':
       						// stub case for input type button elements.
       						break;
       					case 'submit':
       						if(hasSubmit === false){
       							if(this._hasSubmitListener && this._submitElementValue){
       								this._sFormData += this._submitElementValue + '&';
+      							}
       							else{
       								this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
+      							}
       							hasSubmit = true;
+      						}
       						break;
       					default:
       						this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
+      				}
+      			}
+      		}
       		this._isFormSubmit = true;
       		this._sFormData = this._sFormData.substr(0, this._sFormData.length - 1);
       		this.initHeader('Content-Type', this._default_form_header);
       		return this._sFormData;
       	},
         /**
          * @description Resets HTML form properties when an HTML form or HTML form
          * with file upload transaction is sent.
          * @method resetFormState
          * @private
          * @static
          * @return {void}
          */
       	resetFormState:function(){
       		this._isFormSubmit = false;
       		this._isFileUpload = false;
       		this._formNode = null;
       		this._sFormData = "";
       	},
         /**
          * @description Creates an iframe to be used for form file uploads.  It is remove from the
          * document upon completion of the upload transaction.
          * @method createFrame
          * @private
          * @static
          * @param {string} optional qualified path of iframe resource for SSL in IE.
          * @return {void}
          */
       	createFrame:function(secureUri){
       		// IE does not allow the setting of id and name attributes as object
       		// properties via createElement().  A different iframe creation
       		// pattern is required for IE.
       		var frameId = 'yuiIO' + this._transaction_id;
       		var io;
       		if(window.ActiveXObject){
       			io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
       			// IE will throw a security exception in an SSL environment if the
       			// iframe source is undefined.
       			if(typeof secureUri == 'boolean'){
       				io.src = 'javascript:false';
+      			}
       			else if(typeof secureURI == 'string'){
       				// Deprecated
       				io.src = secureUri;
+      			}
+      		}
       		else{
       			io = document.createElement('iframe');
       			io.id = frameId;
       			io.name = frameId;
+      		}
       		io.style.position = 'absolute';
       		io.style.top = '-1000px';
       		io.style.left = '-1000px';
       		document.body.appendChild(io);
       	},
         /**
          * @description Parses the POST data and creates hidden form elements
          * for each key-value, and appends them to the HTML form object.
          * @method appendPostData
          * @private
          * @static
          * @param {string} postData The HTTP POST data
          * @return {array} formElements Collection of hidden fields.
          */
       	appendPostData:function(postData)
+      	{
       		var formElements = [];
       		var postMessage = postData.split('&');
       		for(var i=0; i < postMessage.length; i++){
       			var delimitPos = postMessage[i].indexOf('=');
       			if(delimitPos != -1){
       				formElements[i] = document.createElement('input');
       				formElements[i].type = 'hidden';
       				formElements[i].name = postMessage[i].substring(0,delimitPos);
       				formElements[i].value = postMessage[i].substring(delimitPos+1);
       				this._formNode.appendChild(formElements[i]);
+      			}
+      		}
       		return formElements;
       	},
         /**
          * @description Uploads HTML form, inclusive of files/attachments, using the
          * iframe created in createFrame to facilitate the transaction.
          * @method uploadFile
          * @private
          * @static
          * @param {int} id The transaction id.
          * @param {object} callback User-defined callback object.
          * @param {string} uri Fully qualified path of resource.
          * @param {string} postData POST data to be submitted in addition to HTML form.
          * @return {void}
          */
       	uploadFile:function(o, callback, uri, postData){
       		// Each iframe has an id prefix of "yuiIO" followed
       		// by the unique transaction id.
       		var oConn = this;
       		var frameId = 'yuiIO' + o.tId;
       		var uploadEncoding = 'multipart/form-data';
       		var io = document.getElementById(frameId);
       		var args = (callback && callback.argument)?callback.argument:null;
       		// Track original HTML form attribute values.
       		var rawFormAttributes =
+      		{
       			action:this._formNode.getAttribute('action'),
       			method:this._formNode.getAttribute('method'),
       			target:this._formNode.getAttribute('target')
       		};
       		// Initialize the HTML form properties in case they are
       		// not defined in the HTML form.
       		this._formNode.setAttribute('action', uri);
       		this._formNode.setAttribute('method', 'POST');
       		this._formNode.setAttribute('target', frameId);
       		if(this._formNode.encoding){
       			// IE does not respect property enctype for HTML forms.
       			// Instead it uses the property - "encoding".
       			this._formNode.setAttribute('encoding', uploadEncoding);
+      		}
       		else{
       			this._formNode.setAttribute('enctype', uploadEncoding);
+      		}
       		if(postData){
       			var oElements = this.appendPostData(postData);
+      		}
       		// Start file upload.
       		this._formNode.submit();
       		// Fire global custom event -- startEvent
       		this.startEvent.fire(o, args);
       		if(o.startEvent){
       			// Fire transaction custom event -- startEvent
       			o.startEvent.fire(o, args);
+      		}
       		// Start polling if a callback is present and the timeout
       		// property has been defined.
       		if(callback && callback.timeout){
       			this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
+      		}
       		// Remove HTML elements created by appendPostData
       		if(oElements && oElements.length > 0){
       			for(var i=0; i < oElements.length; i++){
       				this._formNode.removeChild(oElements[i]);
+      			}
+      		}
       		// Restore HTML form attributes to their original
       		// values prior to file upload.
       		for(var prop in rawFormAttributes){
       			if(YAHOO.lang.hasOwnProperty(rawFormAttributes, prop)){
       				if(rawFormAttributes[prop]){
       					this._formNode.setAttribute(prop, rawFormAttributes[prop]);
+      				}
       				else{
       					this._formNode.removeAttribute(prop);
+      				}
+      			}
+      		}
       		// Reset HTML form state properties.
       		this.resetFormState();
       		// Create the upload callback handler that fires when the iframe
       		// receives the load event.  Subsequently, the event handler is detached
       		// and the iframe removed from the document.
       		var uploadCallback = function()
+      		{
       			if(callback && callback.timeout){
       				window.clearTimeout(oConn._timeOut[o.tId]);
       				delete oConn._timeOut[o.tId];
+      			}
       			// Fire global custom event -- completeEvent
       			oConn.completeEvent.fire(o, args);
       			if(o.completeEvent){
       				// Fire transaction custom event -- completeEvent
       				o.completeEvent.fire(o, args);
+      			}
       			var obj = {};
       			obj.tId = o.tId;
       			obj.argument = callback.argument;
       			try
+      			{
       				// responseText and responseXML will be populated with the same data from the iframe.
       				// Since the HTTP headers cannot be read from the iframe
       				obj.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:io.contentWindow.document.documentElement.textContent;
       				obj.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
+      			}
       			catch(e){}
       			if(callback && callback.upload){
       				if(!callback.scope){
       					callback.upload(obj);
+      				}
       				else{
       					callback.upload.apply(callback.scope, [obj]);
+      				}
+      			}
       			// Fire global custom event -- uploadEvent
       			oConn.uploadEvent.fire(obj);
       			if(o.uploadEvent){
       				// Fire transaction custom event -- uploadEvent
       				o.uploadEvent.fire(obj);
+      			}
       			YAHOO.util.Event.removeListener(io, "load", uploadCallback);
       			setTimeout(
       				function(){
       					document.body.removeChild(io);
       					oConn.releaseObject(o);
       				}, 100);
       		};
       		// Bind the onload handler to the iframe to detect the file upload response.
       		YAHOO.util.Event.addListener(io, "load", uploadCallback);
       	},
         /**
          * @description Method to terminate a transaction, if it has not reached readyState 4.
          * @method abort
          * @public
          * @static
          * @param {object} o The connection object returned by asyncRequest.
          * @param {object} callback  User-defined callback object.
          * @param {string} isTimeout boolean to indicate if abort resulted from a callback timeout.
          * @return {boolean}
          */
       	abort:function(o, callback, isTimeout)
+      	{
       		var abortStatus;
       		var args = (callback && callback.argument)?callback.argument:null;
       		if(o && o.conn){
       			if(this.isCallInProgress(o)){
       				// Issue abort request
       				o.conn.abort();
       				window.clearInterval(this._poll[o.tId]);
       				delete this._poll[o.tId];
       				if(isTimeout){
       					window.clearTimeout(this._timeOut[o.tId]);
       					delete this._timeOut[o.tId];
+      				}
       				abortStatus = true;
+      			}
+      		}
       		else if(o && o.isUpload === true){
       			var frameId = 'yuiIO' + o.tId;
       			var io = document.getElementById(frameId);
       			if(io){
       				// Remove all listeners on the iframe prior to
       				// its destruction.
       				YAHOO.util.Event.removeListener(io, "load");
       				// Destroy the iframe facilitating the transaction.
       				document.body.removeChild(io);
       				if(isTimeout){
       					window.clearTimeout(this._timeOut[o.tId]);
       					delete this._timeOut[o.tId];
+      				}
       				abortStatus = true;
+      			}
+      		}
       		else{
       			abortStatus = false;
+      		}
       		if(abortStatus === true){
       			// Fire global custom event -- abortEvent
       			this.abortEvent.fire(o, args);
       			if(o.abortEvent){
       				// Fire transaction custom event -- abortEvent
       				o.abortEvent.fire(o, args);
+      			}
       			this.handleTransactionResponse(o, callback, true);
+      		}
       		return abortStatus;
       	},
         /**
          * @description Determines if the transaction is still being processed.
          * @method isCallInProgress
          * @public
          * @static
          * @param {object} o The connection object returned by asyncRequest
          * @return {boolean}
          */
       	isCallInProgress:function(o)
+      	{
       		// if the XHR object assigned to the transaction has not been dereferenced,
       		// then check its readyState status.  Otherwise, return false.
       		if(o && o.conn){
       			return o.conn.readyState !== 4 && o.conn.readyState !== 0;
+      		}
       		else if(o && o.isUpload === true){
       			var frameId = 'yuiIO' + o.tId;
       			return document.getElementById(frameId)?true:false;
+      		}
       		else{
       			return false;
+      		}
       	},
         /**
          * @description Dereference the XHR instance and the connection object after the transaction is completed.
          * @method releaseObject
          * @private
          * @static
          * @param {object} o The connection object
          * @return {void}
          */
       	releaseObject:function(o)
+      	{
       		if(o && o.conn){
       			//dereference the XHR instance.
       			o.conn = null;
       			//dereference the connection object.
       			o = null;
+      		}
+      	}
       };
       YAHOO.register("connection", YAHOO.util.Connect, {version: "2.4.1", build: "742"});

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