jQuery+JSON实现AJAX二级联动实例分析

网络编程 2025/11/19 佚名

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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

<%@ WebHandler Language="C#" Class="Handler" %>
using System;
using System.Web;
using System.Data;
public class Handler : IHttpHandler
{
 Common coObj = new Common();
 public void ProcessRequest(HttpContext context)
 {
  if (context.Request.Params["n"] != null)
  {
   string num = context.Request.Params["n"].ToString();
   context.Response.ContentType = "text/plain";
   string str = "select * from address where a_num2=" + num;
   DataTable dt = coObj.GetTable(str);
   string json = JSONHelper.DataTableToJSON(dt);
   context.Response.Write(json);
  }
 }
 public bool IsReusable
 {
  get
  {
   return false;
  }
 }
}

前台dropdownlist.html

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>dropdownlit </title>
<meta name="Generator" content="EditPlus" />
<script type="text/javascript" src="/UploadFiles/2021-04-02/jquery-1.5.2.js">

希望本文所述对大家jQuery程序设计有所帮助。

jQuery,JSON,AJAX,二级联动,AJAX二级联动