<%@ page language="java" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>级联菜单</title>
<script charset="gb2312" type="text/javascript" src="./xmFile.js"> </script>
</head>
<body>
<select id="province" name="province">
<option value="">请选择....</option>
</select>
<select id="city" name="city">
<option value="">请选择.....</option>
</select>
</body>
</html>
function ajaxFunction(){
var xmlHttp;
try{ // Firefox, Opera 8.0+, Safari
xmlHttp=new XMLHttpRequest();
}
catch (e){
try{// Internet Explorer
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e){
try{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e){}
}
}
return xmlHttp;
}
window.onload = function(){
//获取XMLHttpRequest对象
var xmlRequest=ajaxFunction();
//注册事件
xmlRequest.onreadystatechange=function(){
if(xmlRequest.readyState==4){
if(xmlRequest.status==200||xmlRequest.status==304){
var xmlDoc=xmlRequest.responseXML;
alert(xmlDoc);
/*
* <china>
<province name="吉林省">
<city>长春</city>
</province>
<province name="辽宁省">
<city>沈阳</city>
</province>
<province name="山东省">
<city>济南</city>
</province>
</china>
*/
var provinceElements=xmlDoc.getElementsByTagName("province");
//alert(provinceElements.length);
for(var i=0;i<provinceElements.length;i++){
var provinceElement=provinceElements[i];
var namevalue=provinceElement.getAttribute("name");
//alert(namevalue);
var optionElement=document.createElement("option");
optionElement.setAttribute("value",namevalue);
var textElement=document.createTextNode(namevalue);
optionElement.appendChild(textElement);
/*
* <select id="province" name="province">
<option value="">请选择....</option>
</select>
*/
document.getElementById("province").appendChild(optionElement);
}
}
}
}
//打开连接
xmlRequest.open("post","../xmlFileServlet?timeStamp="+new Date().getTime(),true);
xmlRequest.setRequestHeader("Content-Type","application/x-www-form-urlencoded")
//发送请求
xmlRequest.send(null);
}
package cn.ajax;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class XmlFileServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
//生成一个xml文件
response.setContentType("text/xml;charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<china>");
out.println("<province name='吉林省'>");
out.println("<city>长春</city>");
out.println("<city>吉林市</city>");
out.println("<city>四平</city>");
out.println("<city>松原</city>");
out.println("<city>通化</city>");
out.println("</province>");
out.println("<province name='辽宁省'>");
out.println("<city>沈阳</city>");
out.println("<city>大连</city>");
out.println("<city>鞍山</city>");
out.println("<city>抚顺</city>");
out.println("<city>铁岭</city>");
out.println("</province>");
out.println("<province name='山东省'>");
out.println("<city>济南</city>");
out.println("<city>青岛</city>");
out.println("<city>威海</city>");
out.println("<city>烟台</city>");
out.println("<city>潍坊</city>");
out.println("</province>");
out.println("</china>");
}
}