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<!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><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>ajax json jquery 菜单案例</title><style type="text/css">*{margin:0;padding:0;} ???body { font-size: 13px; line-height: 130%; padding: 60px }</style><link rel="stylesheet" type="text/css" href="../css/style.css"/><script src="../js/jquery-2.1.1.min.js"></script><script type="text/javascript">$(function(){$("#first").change(function() {var id=document.getElementById("first").value; $.ajax({ ????type: "POST", ????url: "../jsp/second1.jsp", ????data: "id="+id, ???dataType: "json", ???success: function(data) { ???????var cityList=eval(data); ???????var secondRoot=document.getElementById("second"); ???????secondRoot.innerHTML=null; ???????for(var i=0;i<data.length;i++) ???????{ ???????????var op = document.createElement("option"); ???????????op.innerHTML=cityList[i]; ???????????secondRoot.appendChild(op); ???????} ???}, ???error:function(data){ ???????alert(data); ???} ???});});}); ??</script></head><body> ??<select name="first" id="first" style="width:160px"> ???????<option value="0">---请选择---</option> ???????<option value="1" >中国</option> ???????<option value="2">美国</option> ???????<option value="3">英国</option> ???</select> ???<select name="second" id="second" size="3" style="width:160px"></select></body></html>jsp
<%@ page contentType="text/html; charset=UTF-8" language="java"%><%@ page import="java.util.*,net.sf.json.JSONArray" %><% ???String idStr = (String)request.getParameter("id"); ???int id = idStr == null ? 1 : Integer.parseInt(idStr); ???switch(id){ ???????case 1: ???????????out.println(JSONArray.fromObject("[‘上海‘,‘广州‘,‘山东‘]")); ???????????break; ???????case 2: ???????????out.println(JSONArray.fromObject("[‘美国1‘,‘美国2‘,‘美国3‘]")); ???????????break; ???????case 3: ???????????out.println(JSONArray.fromObject("[‘英国1‘,‘英国2‘,‘英国3‘]")); ???????????break; ???} ????%>单行json_ajax
原文地址：http://www.cnblogs.com/excellencesy/p/7905573.html