手写ajax读取数据例子

< script >

function  objAjax()
{
var  objxml = false ;
   // 尝试创建Microsoft IE浏览器支持的对象
　 try  {
objxml  =   new  ActiveXObject( " Msxml2.XMLHTTP " );
}  catch  (e) {
try  {
objxml  =   new  ActiveXObject( " Microsoft.XMLHTTP " );
}  catch  (e) {
aobjxml  =   false ;
}
}
   // 如果创建不成功，则尝试创建非Microsoft IE浏览器支持的对象
　 if  ( ! objxml  &&   typeof  XMLHttpRequest != ' undefined ' ) {
objxml  =   new  XMLHttpRequest();
}
return  objxml;
}

 


function  openurl(url)
{
    var  objxml = objAjax();
   //   var objxml=new ActiveXObject("Microsoft.XMLHttp") //建立

    objxml.open( " GET " ,url, false );  // 打开
    objxml.send();  // 发送
    retInfo = objxml.responseText; 接收 返回文本字符串
   
  if (objxml.readyState  ==   1 )   // 初始化
       {
            document.getElementById( " aboutproDiv " ).innerHTML  = " 正在加载数据... " ;
        }

     if (objxml.readyState  ==   4 )   // 数据接收完毕
            { 
               document.getElementById( " aboutproDiv " ).style.display = " none " ; // 隐藏
                 return  retInfo;
    }
     else
    {
     return   " -2 " ;
    }
}

function  checkapp(form){
    infoBoard = document.getElementById( " aboutpro_i " );
    myurl = " getdis.aspx?pid= " +<!-- @proId@ -->+ " &rnd= " + Math.random();
     var  retCode  =  openurl(myurl);
     switch (retCode){
         case   " -2 " : infoBoard.innerHTML = ' 该商品暂无评论 ' ; break ;
          default :{
                  infoBoard.innerHTML = retCode;              
                 } break ;
    }
     return ; 
}

  < / script>

 

< body onload = " checkapp() " >

 

  < div id = " aboutpro_i " >
< DIV id = aboutproDiv  > 正在加载中... </ DIV >
   <!-- @item@ -->
                </ div >

 

// getdis.aspx  cs代码

   protected   void  Page_Load( object  sender, EventArgs e)
    {
         if  (Request[ " pid " ]  !=   null )
        {
             string  strReturn  =   " 该商品暂无评论... " ;
             string  strSql  =   " select * from cuspro where pid= " + Request[ " pid " ].ToString() + "  order by id desc " ;
            chat c  =   new  chat();
            DataTable dt  =  c.SqlselectPro(strSql, 2 );
             if  (dt.Rows.Count  >   0 )
            {
                strReturn  =   "" ;
            
               foreach (DataRow dr  in  dt.Rows)
              {
                   string  re = dr[ " reply " ].ToString();
                   if  (re  !=   "" )
                  {
                      strReturn  +=   " <div class='protitle'>评论者: "   +  dr[ " mname " ].ToString()  +   "      "   +  dr[ " ctime " ]  +   " &nbsp;&nbsp;对  "   +  dr[ " pname " ].ToString()  +   "  评论！</div> " ; ;
                   
                      strReturn  +=   " <div class='aboutproitem'> "   +  dr[ " items " ].ToString()  +   " </div> " ;
                      strReturn  +=   " <div class='aboutproitem1'> "   +  dr[ " reply " ].ToString()  +   " </div> " ;
                  }
                   else
                  {

                      strReturn  +=   " <div class='protitle'>评论者: "   +  dr[ " mname " ].ToString()  +   "      "   +  dr[ " ctime " ]  +   " &nbsp;&nbsp;对  "   +  dr[ " pname " ].ToString()  +   "  评论！</div> " ; ;
                 
                      strReturn  +=   " <div class='aboutproitem'> "   +  dr[ " items " ].ToString()  +   " </div> " ;
                  }
              }
            }
            Response.Write(strReturn);
        }
    }