本篇文章主要是对Ajax级联菜单的实例代码进行了介绍，需要的朋友可以过来参考下，希望对大家有所帮助
1.Ajax.html代码如下:<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head> <title>Ajax</title><script type="text/javascript"> function loadXMLDoc(txt) { var xmlhttp; if (window.XMLHttpRequest) {// code for IE7+, Firefox, Chrome, Opera, Safari xmlhttp = new XMLHttpRequest(); } else {// code for IE6, IE5 xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange = function () { if (xmlhttp.readyState == 4 && xmlhttp.status == 200) { var citys = xmlhttp.responseText.split(','); document.getElementById("citys").length = 1; for (i = 0; i < citys.length - 1; i++) { document.getElementById("citys").add(new Option(citys[i], citys[i])); } // document.getElementById("myDiv").innerHTML = xmlhttp.responseText; } } xmlhttp.open("GET","ajax/getdata.aspx?pro="+txt, true); xmlhttp.send(); }</script></head><body><h2>AJAX</h2> <select id="Select1" onchange="loadXMLDoc(this.value)"> <option>请选择省份</option> <option value="1">江苏</option> <option value="2">上海</option> </select> <select id="citys"> <option>请选择城市</option> </select><div id="myDiv"></div></body></html>2.getdata.aspx.cs代码如下:using System;using System.Collections.Generic;using System.Linq;using System.Web;using System.Web.UI;using System.Web.UI.WebControls;public partial class ajax_getdata: System.Web.UI.Page{ protected void Page_Load(object sender, EventArgs e) { string[] js=new string[]{"南京", "苏州", "常州" , "无锡" , "镇江"}; string pro=Request.QueryString["pro"]; if (pro == "1") { string temp = ""; for (int i = 0; i < js.Length; i++) { temp = temp + js[i]; temp = temp + ","; } Response.Write(temp); } else Response.Write(""); }}
