/* Cached [Dada.Ajax.js] in datetime [9/5/2010 8:54:52 PM]*/ 
///////////////////////////////////////////
//    Author : dada
//    CreateDate: 2006-09-25
///////////////////////////////////////////

if(!window.Dada) Dada = {};
if(!Dada.Ajax) Dada.Ajax = {};

Dada.Ajax.options = function()
{

    this.contentType = 'application/x-www-form-urlencoded';
    this.encoding = 'UTF-8';
    this.async = true;
    this.url = '';
    this.method = 'POST';
    this.parameters = '';
    this.callback = null;
    this.onSucceed = null;
    this.onFailed = null;
};

Dada.Ajax.createXmlHttpRequest = function()
{

    var xmlHttpObjects = ['Microsoft.XMLHTTP', 'MSXML.XMLHTTP', 'Microsoft.XMLHTTP', 'Msxml2.XMLHTTP.7.0', 'Msxml2.XMLHTTP.6.0', 'Msxml2.XMLHTTP.5.0', 'Msxml2.XMLHTTP.4.0', 'MSXML2.XMLHTTP.3.0', 'MSXML2.XMLHTTP'];
	var req = null;
    if (window.XMLHttpRequest)
    {
	    return req = new window.XMLHttpRequest();
    }
    else if (window.ActiveXObject)
    {
	    for (var i=0; i<xmlHttpObjects.length; i++)
	    {
	        try
	        {
		        return req = new window.ActiveXObject(xmlHttpObjects[i]);
		    }
		    catch(e){}
	    }
    }
    
    if(!req)
        alert("Failed to create an XMLHttpRequest object!");
	return req;
};

Dada.Ajax.request = function(url, postData, callback)
{
    // Options
    var options = new Dada.Ajax.options();
    if(typeof(url) == 'string')
    {
        if(url) options.url = url;
        if(postData) options.parameters = postData;
        if(callback) options.callback = callback;
    }
    else
    {
        var op = url;
        if(op.contentType) options.contentType = op.contentType;
        if(op.encoding) options.encoding = op.encoding;
        if(op.async) options.async = op.async;
        if(op.url) options.url = op.url;
        if(op.method) options.method = op.method;
        if(op.parameters) options.parameters = op.parameters;
        if(op.onSucceed) options.onSucceed = op.onSucceed;
        if(op.onFailed) options.onFailed = op.onFailed;

        //  Ansyac
        if(typeof(op.async) == 'boolean')
        {
            options.async = op.async;
        }
        else
        {
            options.async = typeof(options.callback) == 'function'
                         || typeof(options.onSucceed) == 'function'
                         || typeof(options.onFailed) == 'function';
        }
    }
    
    // Method
    if(options.method.toUpperCase() == 'GET')
    {
        if(options.url.indexOf('?'))
        {
            options.url += '&' + options.parameters;
        }
        else
        {
            options.url += '?' + options.parameters;
        }
    }
    
    // XmlHttpRequest
    var req = Dada.Ajax.createXmlHttpRequest();
    req.open(options.method, options.url, options.async);
    req.setRequestHeader("Content-Type", options.contentType);
    req.setRequestHeader("Content-Length", options.parameters.length);
	req.send(options.parameters);
    if(options.async)
    {
        req.onreadystatechange = function()
	    {
		    if(req.readyState == 4)
		    {
			    return Dada.Ajax.response(req, options);
		    }
	    }
	}
	else
	{
		return Dada.Ajax.response(req);
	}
};

Dada.Ajax.response = function(req, options)
{

    if(req.status == 200)
	{
	    if(req.responseXML != null && req.responseXML.xml != null && req.responseXML.xml != '')
	    {
	        return req.responseXML;
	    }
	    else
	    {
	        if(req.responseText == '' || req.responseText == null)
	            return req.responseText;
	        
	        var result = null;
	        try
	        {
	            eval('result = ' + req.responseText);
	        }
	        catch(e)
	        {
		        result = req.responseText;
	        }

	        if(options.callback)
	        {
	            // 异步请求，执行回调函数
	            options.callback(result, req.status);
	            return req;
	        }
	        else
	        {
	            if(options.onSucceed)
	            {
	                // 异步请求，执行回调函数
	                options.onSucceed(result, req.status);
	            }
	            else
	            {
	                // 同步请求，返回结果
	                return result;
	            }
	        }
		}
	}
	else
	{
	    if(options.callback)
        {
            // 异步请求，执行回调函数
            options.callback(null, req.status);
        }
        else
        {
            if(options.onFailed)
            {
                // 异步请求，执行回调函数
                options.onFailed(result, req.status);
            }
            else
            {
                // 同步请求，抛出异常
                var ex = new Error('Ajax request failed with status:' + req.status);
                ex.status = req.status;
		        throw ex;
		    }
        }
	}
};

$enc = function(str)
{
	return str.toString().replace(/\%/g, "%26").replace(/=/g, "%3D");
};