日期:2014-05-16 浏览次数:20638 次
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <script src="js/jquery-1.3.1.js" type="text/javascript"></script> <script type="text/javascript"> function validatorloginName(){ //$("#loginName").val()等同于document.getElementById("loginName").value; var loginName=$("#loginName").val(); //采用jQuery的ajax方式提交请求 $.ajax({ type: "POST", url: "VaildateName", data: "loginName="+loginName, success: function(data){ if(data != ""){ setCounty(data); } } }); } //当改变省份时设置城市 function setCounty(result){ //得到每组 var arrydata = result.split(";"); var county = document.getElementById("toCity"); clearSel(county); //清空城市 county.options.add(new Option("请选择城市...")); $.each(arrydata, function(){ var value = this.split(",")[0]; var text = this.split(",")[1]; var option = new Option(text, value); county.options.add(option); }); } // 清空下拉列表 function clearSel(oSelect){ while(oSelect.childNodes.length>0){ oSelect.removeChild(oSelect.childNodes[0]); } } </script> <title>AJAX获得下拉框选择项</title> </head> <body> <FORM id="myform" method="post"> 下拉框 <select name="loginName" id=loginName onchange="validatorloginName();"> <option value=""> 请选择... </option> <option value="a"> 北京城区 </option> <option value="b"> 中国城市 </option> </select> 联动框 <select name="toCity" id="toCity"> <option value=""> 请选择城市... </option> </select> </FORM> </body> </html>
package com.me; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @SuppressWarnings("serial") public class VaildateName extends HttpServlet { public VaildateName() { super(); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); response.setCharacterEncoding("utf-8"); String loginName = request.getParameter("loginName").toString(); String tempStr = ""; if ("a".equals(loginName)) { tempStr = "1,海淀区;2,朝阳区;3,东城区;4,西城区;5,丰台区;6,石景山区;7,崇文区;8,宣武区"; } else if ("b".equals(loginName)) { tempStr = "1,上海;2,北京;3,天津;4,广州;5,辽宁"; } response.getWriter().write(tempStr);// 此值jquery可以接收到 } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } }
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <servlet> <description>This is the description of my J2EE component</description> <display-name>This is the display name of my J2EE component</display-name> <servlet-name>VaildateName</servlet-name> &