+/*
+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"});
ToastFreeware / philipp / winterrodeln / wradmin.git / blobdiff