/**
 * ajax.js Document 
 *
 * @author	DonYue Team
 * @version	$Revision: 0.01 $
 * @copyright	Copyright (C) 2006-2010 DonYue Team
 * @package	DonYue
 */

var Ajaxs = new Array();
function Ajax(recvType, statusId){
	var aj = new Object();
	aj.statusId = statusId ? document.getElementById(statusId) : null;
	aj.targetUrl = '';
	aj.sendString = '';
	aj.recvType = recvType ? recvType : 'XML';
	aj.resultHandle = null;

	aj.createXMLHttpRequest = function(){
		var request = false;
		if(window.XMLHttpRequest){
			request = new XMLHttpRequest();
			if(request.overrideMimeType){
				request.overrideMimeType('text/xml');
			}
		}else if(window.ActiveXObject){
			var versions = ['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'];
			for(var i=0; i<versions.length; i++){
				try{
					request = new ActiveXObject(versions[i]);
					if(request){
						return request;
					}
				}catch(e){
					//alert(e.message);
				}
			}
		}
		return request;
	}

	aj.XMLHttpRequest = aj.createXMLHttpRequest();

	aj.processHandle = function(){
		if(aj.statusId){
			aj.statusId.style.display = '';
		}
		if(aj.XMLHttpRequest.readyState == 1 && aj.statusId){
			aj.statusId.innerHTML = xml_http_building_link;
		}else if(aj.XMLHttpRequest.readyState == 2 && aj.statusId){
			aj.statusId.innerHTML = xml_http_sending;
		}else if(aj.XMLHttpRequest.readyState == 3 && aj.statusId){
			aj.statusId.innerHTML = xml_http_loading;
		}else if(aj.XMLHttpRequest.readyState == 4){			
			if(aj.XMLHttpRequest.status == 200){
				for(k in Ajaxs){
					if(Ajaxs[k] == aj.targetUrl){
						Ajaxs[k] = null;
					}
				}
				if(aj.statusId){
					aj.statusId.innerHTML = xml_http_data_in_processed;
					aj.statusId.style.display = 'none';
				}
				if(aj.recvType == 'HTML') 
					aj.resultHandle(aj.XMLHttpRequest.responseText, aj);
				else if(aj.recvType == 'XML'){
					aj.resultHandle(aj.XMLHttpRequest.responseXML.lastChild.firstChild.nodeValue, aj);
				}
			}else{
				if(aj.statusId){
					aj.statusId.innerHTML = xml_http_load_failed;
				}
			}
		}
	}

	aj.get = function(targetUrl, resultHandle){
		if(in_array(targetUrl, Ajaxs)){
			return false;
		}else{
			arraypush(Ajaxs, targetUrl);
		}
		aj.targetUrl = targetUrl;
		aj.XMLHttpRequest.onreadystatechange = aj.processHandle;
		aj.resultHandle = resultHandle;
		if(window.XMLHttpRequest){
			aj.XMLHttpRequest.open('GET', aj.targetUrl);
			aj.XMLHttpRequest.send(null);
		}else{
		        aj.XMLHttpRequest.open("GET", targetUrl, true);
		        aj.XMLHttpRequest.send();
		}
	}

	aj.post = function(targetUrl, sendString, resultHandle){
		if(in_array(targetUrl, Ajaxs)){
			return false;
		}else{
			arraypush(Ajaxs, targetUrl);
		}
		aj.targetUrl = targetUrl;
		aj.sendString = sendString;
		aj.XMLHttpRequest.onreadystatechange = aj.processHandle;
		aj.resultHandle = resultHandle;
		aj.XMLHttpRequest.open('POST', targetUrl);
    	aj.XMLHttpRequest.setRequestHeader("Cache-Control","no-cache");
    	aj.XMLHttpRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded;");		
		aj.XMLHttpRequest.send(aj.sendString);
	}
	return aj;
}