text: /*
  Copyright (c) 2006, Yahoo! Inc. All rights reserved.
  Code licensed under the BSD License:
  http://developer.yahoo.net/yui/license.txt
  Version: 0.11.3
  */
  
  /**
   * 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.
   * @ class
   */
  YAHOO.util.Connect =
  {
  /**
     * Array of MSFT ActiveX ids for XMLHttpRequest.
     * @private
     * @type array
     */
  	_msxml_progid:[
  		'MSXML2.XMLHTTP.3.0',
  		'MSXML2.XMLHTTP',
  		'Microsoft.XMLHTTP'
  		],
  
    /**
     * Object literal of HTTP header(s)
     * @private
     * @type object
     */
  	_http_header:{},
  
    /**
     * Determines if HTTP headers are set.
     * @private
     * @type boolean
     */
  	_has_http_headers:false,
  
   /**
    * 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.
    * @private
    * @type boolean
    */
      _use_default_post_header:true,
  
   /**
    * 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.
    * @private
    * @type boolean
    */
      _default_post_header:'application/x-www-form-urlencoded',
  
   /**
    * Property modified by setForm() to determine if the data
    * should be submitted as an HTML form.
    * @private
    * @type boolean
    */
      _isFormSubmit:false,
  
   /**
    * Property modified by setForm() to determine if a file(s)
    * upload is expected.
    * @private
    * @type boolean
    */
      _isFileUpload:false,
  
   /**
    * Property modified by setForm() to set a reference to the HTML
    * form node if the desired action is file upload.
    * @private
    * @type object
    */
      _formNode:null,
  
   /**
    * Property modified by setForm() to set the HTML form data
    * for each transaction.
    * @private
    * @type string
    */
      _sFormData:null,
  
   /**
    * Collection of polling references to the polling mechanism in handleReadyState.
    * @private
    * @type object
    */
      _poll:{},
  
   /**
    * Queue of timeout values for each transaction callback with a defined timeout value.
    * @private
    * @type object
    */
      _timeOut:{},
  
    /**
     * The polling frequency, in milliseconds, for HandleReadyState.
     * when attempting to determine a transaction's XHR readyState.
     * The default is 50 milliseconds.
     * @private
     * @type int
     */
       _polling_interval:50,
  
    /**
     * A transaction counter that increments the transaction id for each transaction.
     * @private
     * @type int
     */
       _transaction_id:0,
  
    /**
     * 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.
     * @public
     * @param string id The ActiveX id to be added to initialize the XHR object.
     * @return void
     */
  	setProgId:function(id)
  	{
  		this._msxml_progid.unshift(id);
  	},
  
    /**
     * Member to enable or disable the default POST header.
     * @public
     * @param boolean b Set and use default header - true or false .
     * @return void
     */
  	setDefaultPostHeader:function(b)
  	{
  		this._use_default_post_header = b;
  	},
  
    /**
     * Member to modify the default polling interval.
     * @public
     * @param {int} i The polling interval in milliseconds.
     * @return void
     */
  	setPollingInterval:function(i)
  	{
  		if(typeof i == 'number' && isFinite(i)){
  			this._polling_interval = i;
  		}
  	},
  
    /**
     * Instantiates a XMLHttpRequest object and returns an object with two properties:
     * the XMLHttpRequest instance and the transaction id.
     * @private
     * @param {int} transactionId Property containing the transaction id for this transaction.
     * @return connection 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 http and tId properties
  					obj = { conn:http, tId:transactionId };
  					break;
  				}
  				catch(e){}
  			}
  		}
  		finally
  		{
  			return obj;
  		}
  	},
  
    /**
     * 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.
     * @private
     * @return object
     */
  	getConnectionObject:function()
  	{
  		var o;
  		var tId = this._transaction_id;
  
  		try
  		{
  			o = this.createXhrObject(tId);
  			if(o){
  				this._transaction_id++;
  			}
  		}
  		catch(e){}
  		finally
  		{
  			return o;
  		}
  	},
  
    /**
     * Method for initiating an asynchronous request via the XHR object.
     * @public
     * @param {string} method HTTP transaction method
     * @param {string} uri Fully qualified path of resource
     * @param 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.getConnectionObject();
  
  		if(!o){
  			return null;
  		}
  		else{
  			if(this._isFormSubmit){
  				if(this._isFileUpload){
  					this.uploadFile(o.tId, callback, uri);
  					this.releaseObject(o);
  					return;
  				}
  
  				//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 == 'GET'){
  					uri += "?" +  this._sFormData;
  				}
  				else if(method == 'POST'){
  					//If POST data exists in addition to the HTML form data,
  					//it will be concatenated to the form data.
  					postData = (postData?this._sFormData + "&" + postData:this._sFormData);
  				}
  				this._sFormData = '';
  			}
  
  			o.conn.open(method, uri, true);
  
  			if(this._isFormSubmit || (postData && this._use_default_post_header)){
  				this.initHeader('Content-Type', this._default_post_header);
  				if(this._isFormSubmit){
  					this._isFormSubmit = false;
  				}
  			}
  
  			if(this._has_http_headers){
  				this.setHeader(o);
  			}
  
  			this.handleReadyState(o, callback);
  			o.conn.send(postData?postData:null);
  
  			return o;
  		}
  	},
  
    /**
     * 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.
     *
     * @private
     * @param {object} o The connection object
     * @param callback User-defined callback object
     * @return void
     */
      handleReadyState:function(o, callback)
      {
  
  		var oConn = this;
  
  		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){
  					window.clearInterval(oConn._poll[o.tId]);
  					delete oConn._poll[o.tId];
  
  					if(callback && callback.timeout){
  						delete oConn._timeOut[o.tId];
  					}
  
  					oConn.handleTransactionResponse(o, callback);
  				}
  			}
  		,this._polling_interval);
      },
  
    /**
     * This method attempts to interpret the server response and
     * determine whether the transaction was successful, or if an error or
     * exception was encountered.
     *
     * @private
     * @param {object} o The connection object
     * @param {object} callback - User-defined callback object
     * @param {boolean} determines if the transaction was aborted.
     * @return void
     */
      handleTransactionResponse:function(o, callback, isAbort)
      {
  		// If no valid callback is provided, then do not process any callback handling.
  		if(!callback){
  			this.releaseObject(o);
  			return;
  		}
  
  		var httpStatus, responseObject;
  
  		try
  		{
  			if(o.conn.status !== undefined && o.conn.status != 0){
  				httpStatus = o.conn.status;
  			}
  			else{
  				httpStatus = 13030;
  			}
  		}
  		catch(e){
  			// 13030 is the custom code to indicate the condition -- in Mozilla/FF --
  			// when the o object's status and statusText properties are
  			// unavailable, and a query attempt throws an exception.
  			httpStatus = 13030;
  		}
  
  		if(httpStatus >= 200 && httpStatus < 300){
  			try
  			{
  				responseObject = this.createResponseObject(o, callback.argument);
  				if(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]);
  					}
  				}
  			}
  			catch(e){}
  		}
  		else{
  			try
  			{
  				switch(httpStatus){
  					// The following case labels 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, callback.argument, (isAbort?isAbort:false));
  						if(callback.failure){
  							if(!callback.scope){
  								callback.failure(responseObject);
  							}
  							else{
  								callback.failure.apply(callback.scope, [responseObject]);
  							}
  						}
  						break;
  					default:
  						responseObject = this.createResponseObject(o, callback.argument);
  						if(callback.failure){
  							if(!callback.scope){
  								callback.failure(responseObject);
  							}
  							else{
  								callback.failure.apply(callback.scope, [responseObject]);
  							}
  						}
  				}
  			}
  			catch(e){}
  		}
  
  		this.releaseObject(o);
  		responseObject = null;
      },
  
    /**
     * 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.
     * @private
     * @param {object} o The connection object
     * @param {} callbackArg 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;
  		obj.status = o.conn.status;
  		obj.statusText = o.conn.statusText;
  		obj.getResponseHeader = headerObj;
  		obj.getAllResponseHeaders = headerStr;
  		obj.responseText = o.conn.responseText;
  		obj.responseXML = o.conn.responseXML;
  
  		if(typeof callbackArg !== undefined){
  			obj.argument = callbackArg;
  		}
  
  		return obj;
      },
  
    /**
     * 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.
     *
     * @private
     * @param {int} tId Transaction Id
     * @param callbackArg The user-defined arguments
     * @param isAbort Determines if the exception is an 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;
      },
  
    /**
     * Public method that stores the custom HTTP headers for each transaction.
     * @public
     * @param {string} label The HTTP header label
     * @param {string} value The HTTP header value
     * @return void
     */
  	initHeader:function(label,value)
  	{
  		if(this._http_header[label] === undefined){
  			this._http_header[label] = value;
  		}
  		else{
  			// Concatenate multiple values, comma-delimited,
  			// for the same header label,
  			this._http_header[label] =  value + "," + this._http_header[label];
  		}
  
  		this._has_http_headers = true;
  	},
  
    /**
     * Accessor that sets the HTTP headers for each transaction.
     * @private
     * @param {object} o The connection object for the transaction.
     * @return void
     */
  	setHeader:function(o)
  	{
  		for(var prop in this._http_header){
  			if(this._http_header.hasOwnProperty(prop)){
  				o.conn.setRequestHeader(prop, this._http_header[prop]);
  			}
  		}
  		delete this._http_header;
  
  		this._http_header = {};
  		this._has_http_headers = false;
  	},
  
    /**
     * This method assembles the form label and value pairs and
     * constructs an encoded string.
     * asyncRequest() will automatically initialize the
     * transaction with a HTTP header Content-Type of
     * application/x-www-form-urlencoded.
     * @public
     * @param {string || object} form id or name attribute, or form object.
     * @param {string} optional boolean to indicate SSL environment.
     * @param {string || boolean} optional qualified path of iframe resource for SSL in IE.
     * @return void
     */
  	setForm:function(formId, isUpload, secureUri)
  	{
  		this._sFormData = '';
  		if(typeof formId == 'string'){
  			// Determine if the argument is a form id or a form name.
  			// Note form name usage is deprecated by supported
  			// here for legacy reasons.
  			var oForm = (document.getElementById(formId) || document.forms[formId]);
  		}
  		else if(typeof formId == 'object'){
  			// Treat argument as an HTML form object.
  			var 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){
  			this.createFrame(secureUri?secureUri:null);
  			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 = oForm.elements[i].disabled;
  			oName = oForm.elements[i].name;
  			oValue = oForm.elements[i].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){
  							this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
  							hasSubmit = true;
  						}
  						break;
  					default:
  						this._sFormData += encodeURIComponent(oName) + '=' + encodeURIComponent(oValue) + '&';
  						break;
  				}
  			}
  		}
  
  		this._isFormSubmit = true;
  		this._sFormData = this._sFormData.substr(0, this._sFormData.length - 1);
  	},
  
    /**
     * Creates an iframe to be used for form file uploads.  It is remove from the
     * document upon completion of the upload transaction.
     *
     * @private
     * @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;
  		if(window.ActiveXObject){
  			var io = document.createElement('<IFRAME id="' + frameId + '" name="' + frameId + '">');
  
  			// IE will throw a security exception in an SSL environment if the
  			// iframe source isn't set.
  			if(typeof secureUri == 'boolean'){
  				io.src = 'javascript:false';
  			}
  			else{
  				io.src = secureUri;
  			}
  		}
  		else{
  			var 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);
  	},
  
    /**
     * Uploads HTML form, including files/attachments,  targeting the
     * iframe created in createFrame.
     *
     * @private
     * @param {int} id The transaction id.
     * @param {object} callback - User-defined callback object.
     * @param {string} uri Fully qualified path of resource.
     * @return void
     */
  	uploadFile:function(id, callback, uri){
  
  		var frameId = 'yuiIO' + id;
  		var io = document.getElementById(frameId);
  
  		// Initialize the HTML form properties in case they are
  		// not defined in the HTML form.
  		this._formNode.action = uri;
  		this._formNode.enctype = 'multipart/form-data';
  		this._formNode.method = 'POST';
  		this._formNode.target = frameId;
  		this._formNode.submit();
  
  		// Reset form status properties.
  		this._formNode = null;
  		this._isFileUpload = false;
  		this._isFormSubmit = false;
  
  		// 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()
  		{
  			var obj = {};
  
  			obj.tId = id;
  			obj.responseText = io.contentWindow.document.body?io.contentWindow.document.body.innerHTML:null;
  			obj.responseXML = io.contentWindow.document.XMLDocument?io.contentWindow.document.XMLDocument:io.contentWindow.document;
  			obj.argument = callback.argument;
  
  			if(callback.upload){
  				if(!callback.scope){
  					callback.upload(obj);
  				}
  				else{
  					callback.upload.apply(callback.scope, [obj]);
  				}
  			}
  
  			if(YAHOO.util.Event){
  				YAHOO.util.Event.removeListener(io, "load", uploadCallback);
  			}
  			else if(window.ActiveXObject){
  				io.detachEvent('onload', uploadCallback);
  			}
  			else{
  				io.removeEventListener('load', uploadCallback, false);
  			}
  			setTimeout(function(){ document.body.removeChild(io); }, 100);
  		};
  
  
  		// Bind the onload handler to the iframe to detect the file upload response.
  		if(YAHOO.util.Event){
  			YAHOO.util.Event.addListener(io, "load", uploadCallback);
  		}
  		else if(window.ActiveXObject){
  			io.attachEvent('onload', uploadCallback);
  		}
  		else{
  			io.addEventListener('load', uploadCallback, false);
  		}
  	},
  
    /**
     * Public method to terminate a transaction, if it has not reached readyState 4.
     * @public
     * @param {object} o The connection object returned by asyncRequest.
     * @param {object} callback  User-defined callback object.
     * @param {string} isTimeout boolean to indicate if abort was a timeout.
     * @return void
     */
  	abort:function(o, callback, isTimeout)
  	{
  		if(this.isCallInProgress(o)){
  			o.conn.abort();
  			window.clearInterval(this._poll[o.tId]);
  			delete this._poll[o.tId];
  			if(isTimeout){
  				delete this._timeOut[o.tId];
  			}
  
  			this.handleTransactionResponse(o, callback, true);
  
  			return true;
  		}
  		else{
  			return false;
  		}
  	},
  
    /**
     * Public method to check if the transaction is still being processed.
     * @public
     * @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.conn){
  			return o.conn.readyState != 4 && o.conn.readyState != 0;
  		}
  		else{
  			//The XHR object has been destroyed.
  			return false;
  		}
  	},
  
    /**
     * Dereference the XHR instance and the connection object after the transaction is completed.
     * @private
     * @param {object} o The connection object
     * @return void
     */
  	releaseObject:function(o)
  	{
  		//dereference the XHR instance.
  		o.conn = null;
  		//dereference the connection object.
  		o = null;
  	}
  };