jQuery+JSON实现AJAX二级联动实例分析
本文实例讲述了jQuery+JSON实现AJAX二级联动的方法。分享给大家供大家参考，具体如下：
后台Handler.ashx
<%@WebHandlerLanguage="C#"Class="Handler"%>
usingSystem;
usingSystem.Web;
usingSystem.Data;
publicclassHandler:IHttpHandler
{
CommoncoObj=newCommon();
publicvoidProcessRequest(HttpContextcontext)
{
if(context.Request.Params["n"]!=null)
{
stringnum=context.Request.Params["n"].ToString();
context.Response.ContentType="text/plain";
stringstr="select*fromaddresswherea_num2="+num;
DataTabledt=coObj.GetTable(str);
stringjson=JSONHelper.DataTableToJSON(dt);
context.Response.Write(json);
}
}
publicboolIsReusable
{
get
{
returnfalse;
}
}
}
前台dropdownlist.html
<!DOCTYPEHTMLPUBLIC"-//W3C//DTDHTML4.01Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>dropdownlit</title>
<metaname="Generator"content="EditPlus"/>
<scripttype="text/javascript"src="js/jquery-1.5.2.js"></script>
<scripttype="text/javascript">
$(function(){
InitData(0);
});
functionInitData(n)
{
$.ajax({
type:"POST",
dataType:"json",
url:"Handler.ashx",
data:{"n":n},
success:function(json){
$.each(json,function(i,n){
varpro=$("#dl1");
$(""+n.A_Name+"").appendTo(pro);
});
}
});
}
functionGetCity(n)
{
varcity=$("#dl2");
city.html("");
$.ajax({
type:"POST",
dataType:"json",
url:"Handler.ashx",
data:{"n":n},
success:function(json){
$.each(json,function(i,n){
$(""+n.A_Num1+">"+n.A_Name+"").appendTo(city);
});
}
});
}
</script>
</head>
<body>
<selectid="dl1"onchange="GetCity(this.value)">
</select>
<selectid="dl2">
</select>
</body>
</html>
希望本文所述对大家jQuery程序设计有所帮助。