// +----------------------------------------------------------------------+
// | ThinkPHP                                                             |
// +----------------------------------------------------------------------+
// | Copyright (c) 2006 liu21st.com All rights reserved.                  |
// +----------------------------------------------------------------------+
// | Licensed under the Apache License, Version 2.0 (the 'License');      |
// | you may not use this file except in compliance with the License.     |
// | You may obtain a copy of the License at                              |
// | http://www.apache.org/licenses/LICENSE-2.0                           |
// | Unless required by applicable law or agreed to in writing, software  |
// | distributed under the License is distributed on an 'AS IS' BASIS,    |
// | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or      |
// | implied. See the License for the specific language governing         |
// | permissions and limitations under the License.                       |
// +----------------------------------------------------------------------+
// | Author: liu21st <liu21st@gmail.com>                                  |
// +----------------------------------------------------------------------+
// $Id$

// Ajax for ThinkPHP
var m = {
	'\b': '\\b',
	'\t': '\\t',
	'\n': '\\n',
	'\f': '\\f',
	'\r': '\\r'
};
var ThinkAjax = {
	method:'POST',			// 默认发送方法
	bComplete:false,			// 是否完成
	status:0, //返回状态码
	info:'',	//返回信息
	data:'',	//返回数据
	type:'', // JSON EVAL XML ...
	intval:0,
	options:{},
	debug:false,
	activeRequestCount:0,
	// Ajax连接初始化
	getTransport: function() {//lee99
	   http_request=false;
	   if(window.XMLHttpRequest){//Mozilla浏览器
	      http_request=new XMLHttpRequest();
	      if (http_request.overrideMimeType){//设置MIME类别
	          http_request.overrideMimeType("text/xml");
	      }
	   } else if(window.ActiveXObject){//IE浏览器
		 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 {
					http_request = new ActiveXObject(versions[i]);//alert (versions[i]);
			  } catch(e) {
						//alert(e.message);
			  }
		}
	  }
	  if(!http_request){//异常，创建对象实例失败
	     window.alert("创建XMLHttp对象失败！");
	     return false;
	  }
	  return http_request;
	},
	response:function (response){
		this.options['response']	=	response;
		return this;
	},
	url:function (url){
		this.options['url']	=	url;
		return this;
	},
	params:function (vars){
		this.options['var']	=	vars;
		return this;
	},
	ajaxResponse:function(request,response){
		// 获取ThinkPHP后台返回Ajax信息和数据
		// 此格式为ThinkPHP专用格式
		//alert(request.responseText);
		var str	=	request.responseText;
		str  = str.replace(/([\x00-\x1f\\"])/g, function (a, b) {
                    var c = m[b];
                    if (c) {
                        return c;
                    }else{
						return b;
					}
                     }) ;
      try{
            $return =  eval('(' + str + ')');
            if (this.debug)
            {
                alert(str);
            }
        }catch(ex){
            return ;
        }
		this.status = $return.status;
		this.info	 =	 $return.info;
		this.data = $return.data;
		this.type	=	$return.type;
		
		if (this.type == 'EVAL' )
		{
			// 直接执行返回的脚本
			eval($this.data);
		}else{
			// 处理返回数据
			// 需要在客户端定义ajaxReturn方法
			if (response == undefined)
			{
				try	{(ajaxReturn).apply(this,[this.data,this.status,this.info,this.type]);}
				catch (e){}
				 
			}else {
				try	{ (response).apply(this,[this.data,this.status,this.info,this.type]);}
				catch (e){}
			}
		}

	},
	// 发送Ajax请求
	send:function(url,pars,response)
	{
		var xmlhttp = this.getTransport();
		url = (url == undefined)?this.options['url']:url;
		pars = (pars == undefined)?this.options['var']:pars;
		if (this.intval)
		{
			window.clearTimeout(this.intval);
		}
		this.activeRequestCount++;
		this.bComplete = false;
		try {
			if (this.method == "GET")
			{
				xmlhttp.open(this.method, url+"?"+pars, true);
				pars = "";
			}
			else
			{
				xmlhttp.open(this.method, url, true);
				xmlhttp.setRequestHeader("Method", "POST "+url+" HTTP/1.1");
				xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
			}
			var _self = this;
			xmlhttp.onreadystatechange = function (){
				if (xmlhttp.readyState == 4 ){
					if( xmlhttp.status == 200 && !_self.bComplete)
					{
						_self.bComplete = true;
						_self.activeRequestCount--;
						_self.ajaxResponse(xmlhttp,response);
					}
				}
			}
			xmlhttp.send(pars);
		}
		catch(z) { return false; }
	},
	// 发送表单Ajax操作，暂时不支持附件上传
	sendForm:function(formId,url,response)
	{
		vars = Form.serialize(formId);
		this.send(url,vars,response);
	},
	// 绑定Ajax到HTML元素和事件
	// event 支持根据浏览器的不同 
	// 包括 focus blur mouseover mouseout mousedown mouseup submit click dblclick load change keypress keydown keyup
	bind:function(source,event,url,vars,response)
	{
		var _self = this;
	   $(source).addEvent(event,function (){_self.send(url,vars,response)});
	},
	// 页面加载完成后执行Ajax操作
	load:function(url,vars,response)
	{
		var _self = this;
	   window.addEvent('load',function (){_self.send(url,vars,response)});
	},
	// 延时执行Ajax操作
	time:function(url,vars,time,response)
	{
		var _self = this;
		myTimer =  window.setTimeout(function (){_self.send(url,vars,response)},time);
	},
	// 定制执行Ajax操作
	repeat:function(url,vars,intervals,response)
	{
		var _self = this;
		_self.send(url,vars,response);
		myTimer = window.setInterval(function (){_self.send(url,vars,response)},intervals);
	}
}