X-Git-Url: https://git.toastfreeware.priv.at/philipp/winterrodeln/wradmin.git/blobdiff_plain/c2d2b07d134a64271aede4886b8c1d0f6960cb4d..582150b643140e3e670d66f244812e314c7aa0c1:/wradmin/static/yui/connection/connection.js?ds=sidebyside

diff --git a/wradmin/static/yui/connection/connection.js b/wradmin/static/yui/connection/connection.js
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+/*
+Copyright (c) 2009, Yahoo! Inc. All rights reserved.
+Code licensed under the BSD License:
+http://developer.yahoo.net/yui/license.txt
+version: 2.7.0
+*/
+/**
+ * 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),
+						name = obj.nodeName.toLowerCase();
+					if((name === 'input' || name === 'button') && (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(e2){}
+			}
+		}
+		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 || '');
+
+
+			// 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)
+	{
+		var prop;
+		// Enumerate through callback.customevents members and bind/subscribe
+		// events that match in the _customEvents table.
+		for(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)
+	{
+		var prop;
+		if(this._has_default_headers){
+			for(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(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)
+	{
+        var oForm, oElement, oName, oValue, oDisabled,
+            hasSubmit = false,
+            data = [], item = 0,
+            i,len,j,jlen,opt;
+
+		this.resetFormState();
+
+		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.
+			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.
+			this.createFrame(secureUri?secureUri:null);
+
+			// Set form reference and file upload properties to true.
+			this._isFormSubmit = true;
+			this._isFileUpload = true;
+			this._formNode = oForm;
+
+			return;
+
+		}
+
+		// Iterate over the form elements collection to construct the
+		// label-value pairs.
+		for (i=0,len=oForm.elements.length; i<len; ++i){
+			oElement  = oForm.elements[i];
+			oDisabled = oElement.disabled;
+            oName     = oElement.name;
+
+			// Do not submit fields that are disabled or
+			// do not have a name attribute value.
+			if(!oDisabled && oName)
+			{
+                oName  = encodeURIComponent(oName)+'=';
+                oValue = encodeURIComponent(oElement.value);
+
+				switch(oElement.type)
+				{
+                    // Safari, Opera, FF all default opt.value from .text if
+                    // value attribute not specified in markup
+					case 'select-one':
+                        if (oElement.selectedIndex > -1) {
+                            opt = oElement.options[oElement.selectedIndex];
+                            data[item++] = oName + encodeURIComponent(
+                                (opt.attributes.value && opt.attributes.value.specified) ? opt.value : opt.text);
+                        }
+                        break;
+					case 'select-multiple':
+                        if (oElement.selectedIndex > -1) {
+                            for(j=oElement.selectedIndex, jlen=oElement.options.length; j<jlen; ++j){
+                                opt = oElement.options[j];
+                                if (opt.selected) {
+                                    data[item++] = oName + encodeURIComponent(
+                                        (opt.attributes.value && opt.attributes.value.specified) ? opt.value : opt.text);
+                                }
+                            }
+                        }
+						break;
+					case 'radio':
+					case 'checkbox':
+						if(oElement.checked){
+                            data[item++] = oName + 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){
+                                data[item++] = this._submitElementValue;
+							}
+							hasSubmit = true;
+						}
+						break;
+					default:
+                        data[item++] = oName + oValue;
+				}
+			}
+		}
+
+		this._isFormSubmit = true;
+		this._sFormData = data.join('&');
+
+
+		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(YAHOO.env.ua.ie){
+			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{
+			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 = [],
+			postMessage = postData.split('&'),
+			i, delimitPos;
+		for(i=0; i < postMessage.length; i++){
+			delimitPos = postMessage[i].indexOf('=');
+			if(delimitPos != -1){
+				formElements[i] = document.createElement('input');
+				formElements[i].type = 'hidden';
+				formElements[i].name = decodeURIComponent(postMessage[i].substring(0,delimitPos));
+				formElements[i].value = decodeURIComponent(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 frameId = 'yuiIO' + o.tId,
+		    uploadEncoding = 'multipart/form-data',
+		    io = document.getElementById(frameId),
+		    oConn = this,
+			args = (callback && callback.argument)?callback.argument:null,
+            oElements,i,prop,obj;
+
+		// 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(YAHOO.env.ua.ie){
+			// 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){
+			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(i=0; i < oElements.length; i++){
+				this._formNode.removeChild(oElements[i]);
+			}
+		}
+
+		// Restore HTML form attributes to their original
+		// values prior to file upload.
+		for(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);
+			}
+
+			obj = {
+			    tId : o.tId,
+			    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: "2.7.0", build: "1799"});