ajax ¶þ¼¶Áª¶¯

function CreateXmlHttp()
{
if(window.ActiveXObject)
{
try
{
XmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
catch(e){};

try
{
XmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}
catch(e){};

}
else if(window.XMLHttpRequest)
{
try{
XmlHttp=new XMLHttpRequest();
}
catch(e){};
}
else
{
window.alert('Çë¼ì²éÄãµÄä¯ÀÀÆ÷!');
}
}
//»ñÈ¡¿Ø¼þµÄ±àºÅ
function $(id)
{
return document.getElementById(id)
};
//¸ù¾ÝÓû§ËùÑ¡µÄÇøµÄÃû³Æ ¼ÓÔظÃÇøËùÓÐѧУÃû³Æ
var getSchoolName=function(obj)
{
var drop1=$("DropSchool");
CreateXmlHttp();
var url="GetSchoolInfo.ashx?id="+escape(obj)+"&num="+new Date().getTime();
XmlHttp.open("GET",url,true);
XmlHttp.onreadystatechange=function()
{
if(XmlHttp.readyState==4 &&XmlHttp.status==200)
{

drop1.options.length=0;
// drop1.options.add(new Option("ÇëÑ¡ÔñËùÔÚѧУ!","ÇëÑ¡ÔñËùÔÚѧУ!"));
if(XmlHttp.responseText=="No")
{
drop1.options.length=0;
drop1.options.add(new Option("¸ÃÇø»¹Ã»ÓÐÏÂÊôѧУ","¸ÃÇø»¹Ã»ÓÐÏÂÊôѧУ"));
return false;
}
var text=XmlHttp.responseText.split(",");
for(var i=0;i<text.length;i++)
{
var name=text[i].split("-");
var NewOption=document.createElement("Option");
NewOption.value=name[0];
NewOption.innerText=name[1];
drop1.appendChild(NewOption);
if(drop1.options.length==1)
{

}
else
{
$("DropSchool").disabled=false;
}
for(var j=0;j<drop1.options.length;j++)
{

if(drop1.options[j].selected)
{
$("HiddenFiled1").value=drop1.options[i].text;

}
}
}
}

}
XmlHttp.send(null);

}

ashx´úÂë
int id = Convert.ToInt32(context.Request.QueryString["id"].ToString());
StringBuilder sb