960 lines
26 KiB
JavaScript
960 lines
26 KiB
JavaScript
/*
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Copyright (c) 2006, Yahoo! Inc. All rights reserved.
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Code licensed under the BSD License:
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http://developer.yahoo.net/yui/license.txt
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version: 0.12.0
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*/
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/**
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* @description
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* The Connection Manager provides a simplified interface to the XMLHttpRequest
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* object. It handles cross-browser instantiantion of XMLHttpRequest, negotiates the
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* interactive states and server response, returning the results to a pre-defined
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* callback you create.
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*
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* @namespace YAHOO.util
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* @module Connection
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* @Class Connect
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*/
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YAHOO.util.Connect =
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{
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/**
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* @description Array of MSFT ActiveX ids for XMLHttpRequest.
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* @property _msxml_progid
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* @private
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* @static
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* @type array
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*/
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_msxml_progid:[
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'MSXML2.XMLHTTP.3.0',
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'MSXML2.XMLHTTP',
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'Microsoft.XMLHTTP'
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],
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/**
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* @description Object literal of HTTP header(s)
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* @property _http_header
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* @private
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* @static
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* @type object
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*/
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_http_header:{},
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/**
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* @description Determines if HTTP headers are set.
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* @property _has_http_headers
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* @private
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* @static
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* @type boolean
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*/
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_has_http_headers:false,
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/**
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* @description Determines if a default header of
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* Content-Type of 'application/x-www-form-urlencoded'
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* will be added to any client HTTP headers sent for POST
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* transactions.
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* @property _use_default_post_header
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* @private
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* @static
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* @type boolean
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*/
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_use_default_post_header:true,
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/**
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* @description Determines if a default header of
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* Content-Type of 'application/x-www-form-urlencoded'
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* will be added to any client HTTP headers sent for POST
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* transactions.
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* @property _default_post_header
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* @private
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* @static
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* @type boolean
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*/
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_default_post_header:'application/x-www-form-urlencoded',
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/**
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* @description Property modified by setForm() to determine if the data
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* should be submitted as an HTML form.
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* @property _isFormSubmit
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* @private
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* @static
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* @type boolean
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*/
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_isFormSubmit:false,
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/**
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* @description Property modified by setForm() to determine if a file(s)
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* upload is expected.
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* @property _isFileUpload
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* @private
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* @static
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* @type boolean
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*/
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_isFileUpload:false,
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/**
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* @description Property modified by setForm() to set a reference to the HTML
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* form node if the desired action is file upload.
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* @property _formNode
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* @private
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* @static
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* @type object
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*/
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_formNode:null,
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/**
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* @description Property modified by setForm() to set the HTML form data
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* for each transaction.
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* @property _sFormData
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* @private
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* @static
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* @type string
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*/
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_sFormData:null,
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/**
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* @description Collection of polling references to the polling mechanism in handleReadyState.
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* @property _poll
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* @private
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* @static
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* @type object
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*/
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_poll:{},
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/**
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* @description Queue of timeout values for each transaction callback with a defined timeout value.
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* @property _timeOut
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* @private
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* @static
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* @type object
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*/
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_timeOut:{},
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/**
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* @description The polling frequency, in milliseconds, for HandleReadyState.
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* when attempting to determine a transaction's XHR readyState.
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* The default is 50 milliseconds.
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* @property _polling_interval
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* @private
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* @static
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* @type int
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*/
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_polling_interval:50,
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/**
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* @description A transaction counter that increments the transaction id for each transaction.
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* @property _transaction_id
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* @private
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* @static
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* @type int
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*/
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_transaction_id:0,
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/**
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* @description Member to add an ActiveX id to the existing xml_progid array.
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* In the event(unlikely) a new ActiveX id is introduced, it can be added
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* without internal code modifications.
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* @method setProgId
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* @public
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* @static
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* @param {string} id The ActiveX id to be added to initialize the XHR object.
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* @return void
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*/
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setProgId:function(id)
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{
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this._msxml_progid.unshift(id);
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},
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/**
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* @description Member to enable or disable the default POST header.
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* @method setDefaultPostHeader
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* @public
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* @static
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* @param {boolean} b Set and use default header - true or false .
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* @return void
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*/
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setDefaultPostHeader:function(b)
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{
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this._use_default_post_header = b;
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},
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/**
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* @description Member to modify the default polling interval.
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* @method setPollingInterval
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* @public
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* @static
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* @param {int} i The polling interval in milliseconds.
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* @return void
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*/
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setPollingInterval:function(i)
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{
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if(typeof i == 'number' && isFinite(i)){
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this._polling_interval = i;
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}
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},
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/**
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* @description Instantiates a XMLHttpRequest object and returns an object with two properties:
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* the XMLHttpRequest instance and the transaction id.
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* @method createXhrObject
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* @private
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* @static
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* @param {int} transactionId Property containing the transaction id for this transaction.
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* @return object
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*/
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createXhrObject:function(transactionId)
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{
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var obj,http;
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try
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{
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// Instantiates XMLHttpRequest in non-IE browsers and assigns to http.
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http = new XMLHttpRequest();
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// Object literal with http and tId properties
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obj = { conn:http, tId:transactionId };
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}
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catch(e)
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{
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for(var i=0; i<this._msxml_progid.length; ++i){
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try
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{
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// Instantiates XMLHttpRequest for IE and assign to http.
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http = new ActiveXObject(this._msxml_progid[i]);
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// Object literal with conn and tId properties
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obj = { conn:http, tId:transactionId };
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break;
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}
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catch(e){}
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}
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}
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finally
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{
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return obj;
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}
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},
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/**
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* @description This method is called by asyncRequest to create a
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* valid connection object for the transaction. It also passes a
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* transaction id and increments the transaction id counter.
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* @method getConnectionObject
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* @private
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* @static
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* @return {object}
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*/
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getConnectionObject:function()
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{
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var o;
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var tId = this._transaction_id;
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try
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{
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o = this.createXhrObject(tId);
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if(o){
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this._transaction_id++;
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}
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}
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catch(e){}
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finally
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{
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return o;
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}
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},
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/**
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* @description Method for initiating an asynchronous request via the XHR object.
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* @method asyncRequest
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* @public
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* @static
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* @param {string} method HTTP transaction method
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* @param {string} uri Fully qualified path of resource
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* @param {callback} callback User-defined callback function or object
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* @param {string} postData POST body
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* @return {object} Returns the connection object
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*/
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asyncRequest:function(method, uri, callback, postData)
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{
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var o = this.getConnectionObject();
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if(!o){
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return null;
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}
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else{
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if(this._isFormSubmit){
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if(this._isFileUpload){
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this.uploadFile(o.tId, callback, uri, postData);
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this.releaseObject(o);
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return;
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}
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//If the specified HTTP method is GET, setForm() will return an
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//encoded string that is concatenated to the uri to
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//create a querystring.
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if(method == 'GET'){
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if(this._sFormData.length != 0){
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// If the URI already contains a querystring, append an ampersand
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// and then concatenate _sFormData to the URI.
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uri += ((uri.indexOf('?') == -1)?'?':'&') + this._sFormData;
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}
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else{
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uri += "?" + this._sFormData;
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}
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}
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else if(method == 'POST'){
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//If POST data exist in addition to the HTML form data,
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//it will be concatenated to the form data.
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postData = postData?this._sFormData + "&" + postData:this._sFormData;
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}
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}
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o.conn.open(method, uri, true);
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if(this._isFormSubmit || (postData && this._use_default_post_header)){
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this.initHeader('Content-Type', this._default_post_header);
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if(this._isFormSubmit){
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this.resetFormState();
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}
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}
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if(this._has_http_headers){
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this.setHeader(o);
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}
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this.handleReadyState(o, callback);
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o.conn.send(postData || null);
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return o;
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}
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},
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/**
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* @description This method serves as a timer that polls the XHR object's readyState
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* property during a transaction, instead of binding a callback to the
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* onreadystatechange event. Upon readyState 4, handleTransactionResponse
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* will process the response, and the timer will be cleared.
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* @method handleReadyState
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* @private
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* @static
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* @param {object} o The connection object
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* @param {callback} callback The user-defined callback object
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* @return {void}
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*/
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handleReadyState:function(o, callback)
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{
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var oConn = this;
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if(callback && callback.timeout){
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this._timeOut[o.tId] = window.setTimeout(function(){ oConn.abort(o, callback, true); }, callback.timeout);
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}
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this._poll[o.tId] = window.setInterval(
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function(){
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if(o.conn && o.conn.readyState == 4){
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window.clearInterval(oConn._poll[o.tId]);
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delete oConn._poll[o.tId];
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if(callback && callback.timeout){
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delete oConn._timeOut[o.tId];
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}
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oConn.handleTransactionResponse(o, callback);
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}
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}
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,this._polling_interval);
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},
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/**
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* @description This method attempts to interpret the server response and
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* determine whether the transaction was successful, or if an error or
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* exception was encountered.
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* @method handleTransactionResponse
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* @private
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* @static
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* @param {object} o The connection object
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* @param {object} callback The sser-defined callback object
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* @param {boolean} isAbort Determines if the transaction was aborted.
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* @return {void}
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*/
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handleTransactionResponse:function(o, callback, isAbort)
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{
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// If no valid callback is provided, then do not process any callback handling.
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if(!callback){
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this.releaseObject(o);
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return;
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}
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var httpStatus, responseObject;
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try
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{
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if(o.conn.status !== undefined && o.conn.status != 0){
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httpStatus = o.conn.status;
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}
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else{
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httpStatus = 13030;
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}
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}
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catch(e){
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// 13030 is the custom code to indicate the condition -- in Mozilla/FF --
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// when the o object's status and statusText properties are
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// unavailable, and a query attempt throws an exception.
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httpStatus = 13030;
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}
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if(httpStatus >= 200 && httpStatus < 300){
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try
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{
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responseObject = this.createResponseObject(o, callback.argument);
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if(callback.success){
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if(!callback.scope){
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callback.success(responseObject);
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}
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else{
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// If a scope property is defined, the callback will be fired from
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// the context of the object.
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callback.success.apply(callback.scope, [responseObject]);
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}
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}
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}
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catch(e){}
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}
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else{
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try
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{
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switch(httpStatus){
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// The following cases are wininet.dll error codes that may be encountered.
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case 12002: // Server timeout
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case 12029: // 12029 to 12031 correspond to dropped connections.
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case 12030:
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case 12031:
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case 12152: // Connection closed by server.
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case 13030: // See above comments for variable status.
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responseObject = this.createExceptionObject(o.tId, callback.argument, (isAbort?isAbort:false));
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if(callback.failure){
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if(!callback.scope){
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callback.failure(responseObject);
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}
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else{
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callback.failure.apply(callback.scope, [responseObject]);
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}
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}
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break;
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default:
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responseObject = this.createResponseObject(o, callback.argument);
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if(callback.failure){
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if(!callback.scope){
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callback.failure(responseObject);
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}
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else{
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callback.failure.apply(callback.scope, [responseObject]);
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}
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}
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}
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}
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catch(e){}
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}
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this.releaseObject(o);
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responseObject = null;
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},
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/**
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* @description This method evaluates the server response, creates and returns the results via
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* its properties. Success and failure cases will differ in the response
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* object's property values.
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* @method createResponseObject
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* @private
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* @static
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* @param {object} o The connection object
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* @param {callbackArg} callbackArg The user-defined argument or arguments to be passed to the callback
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* @return {object}
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*/
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createResponseObject:function(o, callbackArg)
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{
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var obj = {};
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var headerObj = {};
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try
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{
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var headerStr = o.conn.getAllResponseHeaders();
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var header = headerStr.split('\n');
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for(var i=0; i<header.length; i++){
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var delimitPos = header[i].indexOf(':');
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if(delimitPos != -1){
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headerObj[header[i].substring(0,delimitPos)] = header[i].substring(delimitPos+2);
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}
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}
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}
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catch(e){}
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obj.tId = o.tId;
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obj.status = o.conn.status;
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obj.statusText = o.conn.statusText;
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obj.getResponseHeader = headerObj;
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obj.getAllResponseHeaders = headerStr;
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obj.responseText = o.conn.responseText;
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obj.responseXML = o.conn.responseXML;
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if(typeof callbackArg !== undefined){
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obj.argument = callbackArg;
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}
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return obj;
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},
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/**
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* @description If a transaction cannot be completed due to dropped or closed connections,
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* there may be not be enough information to build a full response object.
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* The failure callback will be fired and this specific condition can be identified
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* by a status property value of 0.
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*
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* If an abort was successful, the status property will report a value of -1.
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*
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* @method createExceptionObject
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* @private
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* @static
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* @param {int} tId The Transaction Id
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* @param {callbackArg} callbackArg The user-defined argument or arguments to be passed to the callback
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* @param {boolean} isAbort Determines if the exception case is caused by a transaction abort
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* @return {object}
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*/
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createExceptionObject:function(tId, callbackArg, isAbort)
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{
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var COMM_CODE = 0;
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var COMM_ERROR = 'communication failure';
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var ABORT_CODE = -1;
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var ABORT_ERROR = 'transaction aborted';
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var obj = {};
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obj.tId = tId;
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if(isAbort){
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obj.status = ABORT_CODE;
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obj.statusText = ABORT_ERROR;
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}
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else{
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obj.status = COMM_CODE;
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obj.statusText = COMM_ERROR;
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}
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if(callbackArg){
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obj.argument = callbackArg;
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}
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return obj;
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},
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/**
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* @description Public method that stores the custom HTTP headers for each transaction.
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* @method initHeader
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* @public
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* @static
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* @param {string} label The HTTP header label
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* @param {string} value The HTTP header value
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* @return {void}
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*/
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initHeader:function(label,value)
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{
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if(this._http_header[label] === undefined){
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this._http_header[label] = value;
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}
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else{
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// Concatenate multiple values, comma-delimited,
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// for the same header label,
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this._http_header[label] = value + "," + this._http_header[label];
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}
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this._has_http_headers = true;
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},
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/**
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* @description Accessor that sets the HTTP headers for each transaction.
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* @method setHeader
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* @private
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* @static
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* @param {object} o The connection object for the transaction.
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* @return {void}
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*/
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setHeader:function(o)
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{
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for(var prop in this._http_header){
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if(this._http_header.hasOwnProperty(prop)){
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o.conn.setRequestHeader(prop, this._http_header[prop]);
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}
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}
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delete this._http_header;
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this._http_header = {};
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this._has_http_headers = false;
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},
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/**
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* @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;
|
|
}
|
|
}; |