/* AJASON

最后修改时间：2008-04-16 18：50
修改内容：修改AJAX返回后的回调函数

* Bringing AJAX and JSON together
*
* This file is part of AJASON.
*
* AJASON is a PHP 5 library and JavaScript client for the upcoming
* Web technology called AJAX. AJAX permits data to be fetched
* asynchronously without the need for reloading the Web page and
* thus allows the development of interactive GUI-like Web applications.
* JSON is a lightweight data interchange format which is used by AJASON
* to exchange data between server and client.
*
* AJASON is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* AJASON is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Foobar; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* AJASON has been developed by Sven Jacobs <sven.jacobs@web.de>.
* For more details visit sven-jacobs.de/wiki/AJASON
*
* Some parts of this project are contributed by other projects, namely
* JSON (json.org) and JSON-PHP (mike.teczno.com/json.html) which are
* copyrighted by their respective authors.
*/

/**
* Ajax JavaScript class
*
* Contains methods to create the XMLHttpRequest object and to call remote
* functions and object methods.
*
* @author Sven Jacobs <sven.jacobs@web.de>
**/

function Ajax( mtd, handler, debug, displayErrors)
{
	var _method        = mtd;
	var _handler       = handler;
	var _debug         = debug;
	var _displayErrors = displayErrors;
	var _clientVersion = "0.9";


	/*** Private methods ***/

	/**
	* Return instance of XMLHttpRequest class
	*
	* @return Object of XMLHttpRequest
	**/
	function getXmlHttpRequestObject()
	{
		var xmlHttpRequest = false;

		if ( window.XMLHttpRequest )
		{
			try
			{
				xmlHttpRequest = new XMLHttpRequest();
			}
			catch (e)
			{
				xmlHttpRequest = false;
			}
		}
		else if ( window.ActiveXObject )
		{
			try
			{
				xmlHttpRequest = new ActiveXObject( "Msxml2.XMLHTTP" );
			}
			catch (e)
			{
				try
				{
					xmlHttpRequest = new ActiveXObject( "Microsoft.XMLHTTP" );
				}
				catch (e)
				{
					xmlHttpRequest = false;
				}
			}
		}

		// Override mime type if browser supports it (like Mozilla)
		if ( xmlHttpRequest.overrideMimeType )
		{
			xmlHttpRequest.overrideMimeType( "text/xml" );
		}

		return xmlHttpRequest;
	}
	function prepareRespnoseText(responseText)
	{
		
		
	}
	/**
	* Prepare XMLHttpRequest object
	*
	* @param[in] xmlHttpRequest XMLHttpRequest object
	* @param[in] params Parameters of function or method which has been called
	* @param[in] data Data which will be send
	* @return Final data which will be send
	**/
	function prepareXmlHttpRequest( xmlHttpRequest, data, callback )
	{
		var callbackFunction = callback;  //传入的回调函数如backdata('divUsername')
		var handler;
		var finalData;
		if ( _method == "GET" )
		{
			handler   = _handler + "?" + data;
			finalData = null;
		}
		else
		{
			handler   = _handler;
			finalData = data;
		}

		xmlHttpRequest.open( _method, handler, true );
		if ( _method == "POST" )
		{
			xmlHttpRequest.setRequestHeader( "Method",        "POST " + _handler + " HTTP/1.1" );
			xmlHttpRequest.setRequestHeader( "Content-Type",  "application/x-www-form-urlencoded" );
			xmlHttpRequest.setRequestHeader( "Content-Length", finalData.length );
		}

		xmlHttpRequest.onreadystatechange = function()
		{
			if ( xmlHttpRequest.readyState == 4 )
			{
				try
				{
					//该处处理处理，模板调用的问题
					var responseText=xmlHttpRequest.responseText;
					var index=responseText.indexOf('{"');//根据标示，把前面多余的参数去掉
					responseText =responseText.substring(index,responseText.length);
					responseText = trim(responseText);
					//alert(responseText);
					//document.write(responseText);
					//var response = JSON.parse( xmlHttpRequest.responseText);
					var m_php = PHPSerializer;
					var response = m_php.unserialize(responseText); //反序列化服务端返回的结果值
					//alert(response);
				}
				catch (e)
				{
					alert( "AJAX error:\nUnknown response from server!\n\n" + xmlHttpRequest.responseText );
					return;
				}
				if ( response.errorCode == 0 && callbackFunction != '' )
				{
					if ( _debug )
					{
						// Show client/server versions and whole server response before executing callback function
						alert( "AJAX debug info:\n\nServer version: " + response.serverVersion + "\nClient version: " + _clientVersion + "\nServer response: " + xmlHttpRequest.responseText );
					}
					//处理并执行CallBack函数
					var re = new RegExp("(\\w+)", "");
					var cbFuncname = re.exec(callbackFunction); //匹配取出回调函数名
					var cbParams=callbackFunction.substr( cbFuncname[0].length+1 ); //取回调函数的参数
					cbParams = trim(cbParams); //去掉前后空格
					var cbFunc="";
					if (cbParams.length==1) //无CallBack函数的参数
					{
						cbFunc=cbFuncname[0]+"(response.response"+cbParams+";";
					}
					else
					{				
						cbFunc=cbFuncname[0]+"(response.response,"+cbParams+";";							
					}
					eval(cbFunc); //执行动态生成的CallBack函数

				}
				else if ( response.errorCode != 0 && _displayErrors )
				{
					alert( "AJAX error:\n" + response.errorMessage );
				}
			}
		}
		return finalData;
	}
	/**
	*返回callbac回调函数的参数串供组合,(暂未用)
	*/
	function getCallBackParams(funcName,callbackFunction)
	{
		var funcLength=funcName.length;
		if (checkHasParams(callbackFunction))
		{
			var params=callbackFunction.substring(funcLength+1,callbackFunction.length);
			return params;
		}
		else
		{
			return ")"; //没参数时直接返回右括号
		}

	}
	/**
	*检测回调函数是否带参数,(暂未用)
	*/
	function checkHasParams(callbackFunction)
	{
		//替换空字符；
		// 正则表达式对象
		var re = new RegExp("\\s+", "");	
		var newstring=callbackFunction.replace(re,"");
		var beginpos=newstring.indexOf("(",0);		
		var ilength=newstring.length;
		if ((ilength-beginpos)<3)
		{
			return false;
		}
		else
		{
			return true;
		}

	}


	/**
	* Do params include callback function?
	*
	* @param[in] params Parameters of function or method which has been called
	* @return Returns true if params contain callback function
	*,(暂未用)
	**/
	function paramsHaveCallbackFunction( params )
	{

		if ( typeof( params ) == "object" && params.length > 0 )
		{
			return ( typeof( params[ params.length - 1 ] ) == "function" );
		}
		else
		{
			return false;
		}
	}

	/**
	* Return callback function from params
	*
	* @param[in] params Parameters of function or method which has been called
	* @return Callback function
	* ,(暂未用)
	**/
	function getCallbackFunction( params )
	{
		if ( paramsHaveCallbackFunction( params ) )
		{
			return params[ params.length - 1 ];

		}
		else
		{
			return null;
		}
	}

	/**
	* Prepare parameters
	*
	* @param[in] params Parameters of function or method which has been called
	* @return Prepared parameters
	**/
	function prepareParams( params )
	{
		var preparedParams = new Array();
		if ( typeof( params ) == "object" && params.length > 0 )
		{
			var end;

			if ( paramsHaveCallbackFunction( params ) )
			{
				end = 1;
			}
			else
			{
				end = 0;
			}

			for( var i = 0; i < params.length - end ; i++ )
			{
				preparedParams.push( params[ i ] );
			}
		}

		return preparedParams;
	}

	/**
	* Prepare data
	*
	* @param[in] cls Class name or null
	* @param[in] funcOrMtd Function name (if cls == null) or method name
	* @param[in] params Parameters of function or method which has been called
	* @return Prepared data
	**/
	function prepareData(serviceid,methodid, params, callmode,excuteMethod )
	{
		if(excuteMethod=='phprpc')//以PHPRPC处理
		{
			var data = new Object();
			//var data = new Array();
			data[ "clientVersion" ] = _clientVersion;
			data[ "params" ]        = prepareParams( params );
			data[ "methodid" ] = methodid;
			data["serviceid"]=serviceid;
			data["callmode"]=callmode; //调用模式，供TPL调用识别用
			//return "ajax=" + escape( JSON.stringify( data ) );
			var m_php      = PHPSerializer;
			return "ajax=" + m_php.serialize(data);//序列化要发送的参数
		}else
		{
			var data = new Object();
			//var data = new Array();
			data[ "clientVersion" ] = _clientVersion;
			data[ "params" ]        = prepareParams( params );
			data[ "methodid" ] = methodid;
			data["serviceid"]=serviceid;
			data["callmode"]=callmode; //调用模式，供TPL调用识别用
			//return "ajax=" + escape( JSON.stringify( data ) );
			var m_php      = PHPSerializer;
			return "ajax=" + escape(m_php.serialize(data));//序列化要发送的参数
		}
	}
	
	
	/**
	* Finally send request
	*
	* @param[in] params Parameters of function or method which has been called
	* @param[in] data Data to be send
	**/
	function call( data ,callback,excuteMethod)
	{
		if(excuteMethod=='phprpc')//调用PHPRPC客户端的JS
		{
			rpc_call(data, callback)			
		}else
		{
			var xmlHttpRequest = getXmlHttpRequestObject();
			prepareXmlHttpRequest( xmlHttpRequest, data,callback );
			xmlHttpRequest.send(data);
		}		
	}

	/*** Public methods ***/

	/**
	* Call remote method
	*
	* @param[in] cls Name of remote class
	* @param[in] mtd Name of remote method
	* @param[in] params Parameters of local method which has been called
	**/
	this.callMethod = function(serviceid,methodid, params,callback,excuteMethod )
	{
		var data = prepareData(serviceid,methodid, params );
		call( params, data,callback,excuteMothod );
	}

	/**
	* Call remote function
	*
	* @param[in] func Name of remote function
	* @param[in] params Parameters of local function which has been called
	**/
	this.callFunction = function(serviceid,funcid, params,callback,excuteMethod)
	{
		var data = prepareData(serviceid,funcid, params);
		call( params, data,callback,excuteMothod );
	}
	this.callTpl=function(serviceid,tplid,params,callback,callmode,excuteMethod)
	{ 
		var data = prepareData(serviceid, tplid, params, callmode,excuteMethod);
		call( data,callback,excuteMethod );
	}
}