Diffstat (limited to 'frontend/beta/js/YUI/connection.js') (more/less context) (ignore whitespace changes)
| -rw-r--r-- | frontend/beta/js/YUI/connection.js | 960 |
1 files changed, 960 insertions, 0 deletions
diff --git a/frontend/beta/js/YUI/connection.js b/frontend/beta/js/YUI/connection.js new file mode 100644 index 0000000..58f6d0f --- a/dev/null +++ b/frontend/beta/js/YUI/connection.js @@ -0,0 +1,960 @@ +/*
+Copyright (c) 2006, Yahoo! Inc. All rights reserved.
+Code licensed under the BSD License:
+http://developer.yahoo.net/yui/license.txt
+version: 0.12.0
+*/
+
+/**
+ * @description
+ * 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
+ * @Class Connect
+ */
+YAHOO.util.Connect =
+{
+ /**
+ * @description Array of MSFT ActiveX ids for XMLHttpRequest.
+ * @property _msxml_progid
+ * @private
+ * @static
+ * @type array
+ */
+ _msxml_progid:[
+ 'MSXML2.XMLHTTP.3.0',
+ 'MSXML2.XMLHTTP',
+ 'Microsoft.XMLHTTP'
+ ],
+
+ /**
+ * @description Object literal of HTTP header(s)
+ * @property _http_header
+ * @private
+ * @static
+ * @type object
+ */
+ _http_header:{},
+
+ /**
+ * @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 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 _default_post_header
+ * @private
+ * @static
+ * @type boolean
+ */
+ _default_post_header:'application/x-www-form-urlencoded',
+
+ /**
+ * @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 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 enable or disable the default POST header.
+ * @method setDefaultPostHeader
+ * @public
+ * @static
+ * @param {boolean} b Set and use default header - true or false .
+ * @return void
+ */
+ setDefaultPostHeader:function(b)
+ {
+ this._use_default_post_header = b;
+ },
+
+ /**
+ * @description Member to modify the default polling interval.
+ * @method setPollingInterval
+ * @public
+ * @static
+ * @param {int} i The polling interval in milliseconds.
+ * @return void
+ */
+ setPollingInterval:function(i)
+ {
+ if(typeof i == 'number' && isFinite(i)){
+ this._polling_interval = i;
+ }
+ },
+
+ /**
+ * @description Instantiates a XMLHttpRequest object and returns an object with two properties:
+ * the XMLHttpRequest instance and the transaction id.
+ * @method createXhrObject
+ * @private
+ * @static
+ * @param {int} transactionId Property containing the transaction id for this transaction.
+ * @return object
+ */
+ createXhrObject:function(transactionId)
+ {
+ var obj,http;
+ try
+ {
+ // Instantiates XMLHttpRequest in non-IE browsers and assigns to http.
+ http = new XMLHttpRequest();
+ // Object literal with http and tId properties
+ obj = { conn:http, tId:transactionId };
+ }
+ catch(e)
+ {
+ for(var i=0; i<this._msxml_progid.length; ++i){
+ try
+ {
+ // Instantiates XMLHttpRequest for IE and assign to http.
+ http = new ActiveXObject(this._msxml_progid[i]);
+ // Object literal with conn and tId properties
+ obj = { conn:http, tId:transactionId };
+ break;
+ }
+ catch(e){}
+ }
+ }
+ finally
+ {
+ return obj;
+ }
+ },
+
+ /**
+ * @description This method is called by asyncRequest to create a
+ * valid connection object for the transaction. It also passes a
+ * transaction id and increments the transaction id counter.
+ * @method getConnectionObject
+ * @private
+ * @static
+ * @return {object}
+ */
+ getConnectionObject:function()
+ {
+ var o;
+ var tId = this._transaction_id;
+
+ try
+ {
+ o = this.createXhrObject(tId);
+ 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.getConnectionObject();
+
+ if(!o){
+ return null;
+ }
+ else{
+ if(this._isFormSubmit){
+ if(this._isFileUpload){
+ this.uploadFile(o.tId, callback, uri, postData);
+ 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'){
+ 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{
+ uri += "?" + this._sFormData;
+ }
+ }
+ else if(method == '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;
+ }
+ }
+
+ 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.resetFormState();
+ }
+ }
+
+ if(this._has_http_headers){
+ this.setHeader(o);
+ }
+
+ this.handleReadyState(o, callback);
+ o.conn.send(postData || null);
+
+ return o;
+ }
+ },
+
+ /**
+ * @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;
+
+ 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);
+ },
+
+ /**
+ * @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 sser-defined callback object
+ * @param {boolean} isAbort 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 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, 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;
+ },
+
+ /**
+ * @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;
+ 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;
+ },
+
+ /**
+ * @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 Public method that stores the custom HTTP headers for each transaction.
+ * @method initHeader
+ * @public
+ * @static
+ * @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;
+ },
+
+ /**
+ * @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)
+ {
+ 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;
+ },
+
+ /**
+ * @description 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.
+ * @method setForm
+ * @public
+ * @static
+ * @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 {string} string of the HTML form field name and value pairs..
+ */
+ setForm:function(formId, isUpload, secureUri)
+ {
+ this.resetFormState();
+ var oForm;
+ if(typeof formId == 'string'){
+ // Determine if the argument is a form id or a form name.
+ // Note form name usage is deprecated 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;
+ }
+
+ 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);
+
+ 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} secureUri 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 is undefined.
+ if(typeof secureUri == 'boolean'){
+ io.src = 'javascript:false';
+ }
+ else if(typeof secureURI == 'string'){
+ // Deprecated
+ 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);
+ },
+
+ /**
+ * @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 = new Array();
+ var postMessage = postData.split('&');
+ for(var i=0; i < postMessage.length; i++){
+ var delimitPos = postMessage[i].indexOf('=');
+ if(delimitPos != -1){
+ formElements[i] = document.createElement('input');
+ formElements[i].type = 'hidden';
+ formElements[i].name = postMessage[i].substring(0,delimitPos);
+ formElements[i].value = postMessage[i].substring(delimitPos+1);
+ this._formNode.appendChild(formElements[i]);
+ }
+ }
+
+ return formElements;
+ },
+
+ /**
+ * @description Uploads HTML form, including files/attachments, to the
+ * iframe created in createFrame.
+ * @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.
+ * @return {void}
+ */
+ uploadFile:function(id, callback, uri, postData){
+
+ // Each iframe has an id prefix of "yuiIO" followed
+ // by the unique transaction id.
+ 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.method = 'POST';
+ this._formNode.target = frameId;
+
+ if(this._formNode.encoding){
+ // IE does not respect property enctype for HTML forms.
+ // Instead use property encoding.
+ this._formNode.encoding = 'multipart/form-data';
+ }
+ else{
+ this._formNode.enctype = 'multipart/form-data';
+ }
+
+ if(postData){
+ var oElements = this.appendPostData(postData);
+ }
+
+ this._formNode.submit();
+
+ if(oElements && oElements.length > 0){
+ try
+ {
+ for(var i=0; i < oElements.length; i++){
+ this._formNode.removeChild(oElements[i]);
+ }
+ }
+ catch(e){}
+ }
+
+ // Reset HTML form status 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()
+ {
+ var obj = {};
+ obj.tId = id;
+ obj.argument = callback.argument;
+
+ try
+ {
+ 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;
+ }
+ catch(e){}
+
+ 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.detachEvent){
+ 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.attachEvent){
+ io.attachEvent('onload', uploadCallback);
+ }
+ else{
+ io.addEventListener('load', uploadCallback, false);
+ }
+ },
+
+ /**
+ * @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 was a timeout.
+ * @return {boolean}
+ */
+ 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.
+ *
+ * @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.conn){
+ return o.conn.readyState != 4 && o.conn.readyState != 0;
+ }
+ else{
+ //The XHR object has been destroyed.
+ 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)
+ {
+ //dereference the XHR instance.
+ o.conn = null;
+ //dereference the connection object.
+ o = null;
+ }
+};
\ No newline at end of file |