connection.js

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/*
Copyright (c) 2007, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 2.3.0
*/
/**
 * 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:[
		'MSXML2.XMLHTTP.3.0',
		'MSXML2.XMLHTTP',
		'Microsoft.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 Determines if a default header of
  * Content-Type of 'application/x-www-form-urlencoded'
  * will be added to client HTTP headers sent for POST
  * transactions.
  * @property _default_post_header
  * @private
  * @static
  * @type boolean
  */
    _default_post_header:'application/x-www-form-urlencoded; charset=UTF-8',

 /**
  * @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);
					if(obj.type == '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 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 enable or disable the default POST header.
   * @method setDefaultXhrHeader
   * @public
   * @static
   * @param {boolean} b Set and use default header - true or false .
   * @return void
   */
	setDefaultXhrHeader:function(b)
	{
		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(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(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