<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>Ajax菜单 测试二级联动查询</title>
<Meta http-equiv="pragma" content="no-cache">
<Meta http-equiv="cache-control" content="no-cache">
<Meta http-equiv="expires" content="0">
<Meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<Meta http-equiv="description" content="This is my page">
<script type="text/javascript">
var xmlHttp;
function createXMLRequest(){
if(window.ActiveXObject){
xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
}else if(window.XMLHttpRequest){
xmlHttp = new XMLHttpRequest();
}else{
alert("你的浏览器不支持Ajax！");
}
}
function getCities(){
createXMLRequest();
var province = document.getElementById("provincesID").value;
xmlHttp.open("post","test/getCities.jsp?province="+province,true);
xmlHttp.onreadystatechange = returnCities;
xmlHttp.send(null);
}
function returnCities(){
var cs = document.getElementById("citiesID");
if(xmlHttp.readyState == 4){
if(xmlHttp.status == 200){
var returnXML = xmlHttp.responseXML;
var city = returnXML.getElementsByTagName("city");
while(cs.childNodes.length>2){
cs.removeChild(cs.childNodes[cs.childNodes.length-1]);
}
for(var i=0;i<city.length; i++){
var option = document.createElement("option");
option.innerHTML = city[i].firstChild.data;
cs.appendChild(option);
}
}
}
}
</script>
</head>
<body>
<div>
<h3>级联菜单</h3>
选择省份：
<form action="to.jsp" method="post">
<select name="provinces" id="provincesID" onchange="getCities()">
<option value="">--请选择省份--</option>
<option value="zj">浙江</option>
<option value="gd">广东</option>
</select>
选择城市：
<select name="cities" id="citiesID">
<option value="">请选择城市</option>
</select>
<input type="submit" value="提交">
</form>
</div>
</body>
</html>
==============================
<% String province = request.getParameter("province"); request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); response.setContentType("text/xml;charset=utf-8"); if(province.equals("zj")){ out.println("<?xml version='1.0' encoding='utf-8'?>"); out.println("<cities>"); out.println("<city>杭州</city>"); out.println("</cities>"); } if(province.equals("gd")){ out.println("<?xml version='1.0' encoding='utf-8'?>"); out.println("<cities>"); out.println("<city>guangzhou</city>"); out.println("</cities>"); }%>
原文链接：https://www.f2er.com/ajax/164567.html