java ajax二级省市联动
2012-06-13 21:35
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省市二级联动实现，网上找了好多，终于实现了。这里用的是数据库链接查询并用XML方式返回。（用的数据池）
1.、编写的index.jsp。
Java代码
<%@ page language="java" import="java.util.*,com.dao.*" pageEncoding="UTF-8"%>
<%@ page import="com.vo.*" %>
<% //这个是调用dao层返回市表中的内容。
UserDao ud=new UserDao();
ArrayList<Sheng> list=(ArrayList)ud.seclect();
%>
<html>
<head>
<script type="text/javascript" src="js/test.js"></script>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<form method="post" name="form1" action="">
<select id="slt1" onchange="updateSelect()">
<option>请选择省份</option>
<%
Sheng sheng=null;
for(int i=0;i<list.size();i++)
{
sheng=(Sheng)list.get(i);
%>
<option value="<%=sheng.getId()%>"><%=sheng.getName() %></option>
<%
}
%>
</select>
<select id="slt2">
<option value="">请选择地市</option>
</select>
</form>
</body>
</html>
2、编写js代码。
Java代码
function getXmlHttpRequestObject() {
if (window.XMLHttpRequest) {
return new XMLHttpRequest();
} else {
if (window.ActiveXObject) {
return new ActiveXObject("Microsoft.XMLHTTP");
} else {
}
}
}
function createAjaxObj() {
var httprequest = false;
if (window.XMLHttpRequest) {
httprequest = new XMLHttpRequest();
if (httprequest.overrideMimeType) {
httprequest.overrideMimeType("text/xml");
}
} else {
if (window.ActiveXObject) {
try {
httprequest = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
try {
httprequest = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e) {
}
}
}
}
return httprequest;
}
var httpReq = createAjaxObj();
//上边的代码是固定的。
function updateSelect(){
var selected = document.all.slt1.value;
httpReq.open("GET","testU?tid="+selected,false);
httpReq.onreadystatechange=function(){
checkReqCallBack();
};
httpReq.send(null);
}
function checkReqCallBack(){
if(httpReq.readyState == 4) {
if(httpReq.status ==200){
var xmlDoc = httpReq.responseXML.documentElement;//获得返回的XML文档
var xSel = xmlDoc.getElementsByTagName('select');
//获得XML文档中的所有<select>标记
var select_root = document.getElementById('slt2');
//获得网页中的第二个下拉框
select_root.options.length=0;
//每次获得新的数据的时候先把每二个下拉框架的长度清0
for(var i=0;i<xSel.length;i++){
var xValue = xSel[i].childNodes[0].firstChild.nodeValue;
//获得每个<select>标记中的第一个标记的值,也就是<value>标记的值
var xText = xSel[i].childNodes[1].firstChild.nodeValue;
//获得每个<select>标记中的第二个标记的值,也就是<text>标记的值
var option = new Option(xText, xValue);
//根据每组value和text标记的值创建一个option对象
try{
select_root.add(option);//将option对象添加到第二个下拉框中
}catch(e){
}
}
}else{
alert("不能得到描述信息:" + req.statusText);
}
}
}
3、编写的servlet。
Java代码
package com.servlet;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dao.UserDao;
import com.vo.Shi;
public class TestU extends HttpServlet {
public String tid;
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
UserDao ud=new UserDao();
try {
response.setCharacterEncoding("GBK");
response.setContentType("text/xml");
response.setHeader("Cache-Control", "no-cache");
request.setCharacterEncoding("GBK");
response.setCharacterEncoding("UTF-8");
tid=request.getParameter("tid").toString();
ArrayList<?> list=ud.check(tid);
String xml_start = "<selects>";
String xml_end = "</selects>";
String xml = "";
Shi shi=null;
for(int i=0;i<list.size();i++){
shi=new Shi();
shi=(Shi) list.get(i);
xml+="<select><value>"+shi.getId()+"</value><text>"+shi.getName()+"</text></select>";
}
String last_xml = xml_start + xml + xml_end;
response.getWriter().write(last_xml);
} catch (Exception e) {
e.printStackTrace();
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}
总结：当一级省select改变时出发ajax，调用servlet并在servlet中调用dao层返回查找到的市级表，用ArrayList返回给servlet，在servlet中生成XML代码。
在js中用XML方式解析，（1、取得获得XML文档中的所有<select>标记，为以后的迭代准备。2、取得页面的市节点，创建一个option对象，将option对象添加到第二个下拉框中。）。
1.、编写的index.jsp。
Java代码
<%@ page language="java" import="java.util.*,com.dao.*" pageEncoding="UTF-8"%>
<%@ page import="com.vo.*" %>
<% //这个是调用dao层返回市表中的内容。
UserDao ud=new UserDao();
ArrayList<Sheng> list=(ArrayList)ud.seclect();
%>
<html>
<head>
<script type="text/javascript" src="js/test.js"></script>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<form method="post" name="form1" action="">
<select id="slt1" onchange="updateSelect()">
<option>请选择省份</option>
<%
Sheng sheng=null;
for(int i=0;i<list.size();i++)
{
sheng=(Sheng)list.get(i);
%>
<option value="<%=sheng.getId()%>"><%=sheng.getName() %></option>
<%
}
%>
</select>
<select id="slt2">
<option value="">请选择地市</option>
</select>
</form>
</body>
</html>
<%@ page language="java" import="java.util.*,com.dao.*" pageEncoding="UTF-8"%>
<%@ page import="com.vo.*" %>
<% //这个是调用dao层返回市表中的内容。
UserDao ud=new UserDao();
ArrayList<Sheng> list=(ArrayList)ud.seclect();
%>
<html>
<head>
<script type="text/javascript" src="js/test.js"></script>
<title>My JSP 'index.jsp' starting page</title>
</head>
<body>
<form method="post" name="form1" action="">
<select id="slt1" onchange="updateSelect()">
<option>请选择省份</option>
<%
Sheng sheng=null;
for(int i=0;i<list.size();i++)
{
sheng=(Sheng)list.get(i);
%>
<option value="<%=sheng.getId()%>"><%=sheng.getName() %></option>
<%
}
%>
</select>
<select id="slt2">
<option value="">请选择地市</option>
</select>
</form>
</body>
</html>2、编写js代码。
Java代码
function getXmlHttpRequestObject() {
if (window.XMLHttpRequest) {
return new XMLHttpRequest();
} else {
if (window.ActiveXObject) {
return new ActiveXObject("Microsoft.XMLHTTP");
} else {
}
}
}
function createAjaxObj() {
var httprequest = false;
if (window.XMLHttpRequest) {
httprequest = new XMLHttpRequest();
if (httprequest.overrideMimeType) {
httprequest.overrideMimeType("text/xml");
}
} else {
if (window.ActiveXObject) {
try {
httprequest = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
try {
httprequest = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e) {
}
}
}
}
return httprequest;
}
var httpReq = createAjaxObj();
//上边的代码是固定的。
function updateSelect(){
var selected = document.all.slt1.value;
httpReq.open("GET","testU?tid="+selected,false);
httpReq.onreadystatechange=function(){
checkReqCallBack();
};
httpReq.send(null);
}
function checkReqCallBack(){
if(httpReq.readyState == 4) {
if(httpReq.status ==200){
var xmlDoc = httpReq.responseXML.documentElement;//获得返回的XML文档
var xSel = xmlDoc.getElementsByTagName('select');
//获得XML文档中的所有<select>标记
var select_root = document.getElementById('slt2');
//获得网页中的第二个下拉框
select_root.options.length=0;
//每次获得新的数据的时候先把每二个下拉框架的长度清0
for(var i=0;i<xSel.length;i++){
var xValue = xSel[i].childNodes[0].firstChild.nodeValue;
//获得每个<select>标记中的第一个标记的值,也就是<value>标记的值
var xText = xSel[i].childNodes[1].firstChild.nodeValue;
//获得每个<select>标记中的第二个标记的值,也就是<text>标记的值
var option = new Option(xText, xValue);
//根据每组value和text标记的值创建一个option对象
try{
select_root.add(option);//将option对象添加到第二个下拉框中
}catch(e){
}
}
}else{
alert("不能得到描述信息:" + req.statusText);
}
}
}
function getXmlHttpRequestObject() {
if (window.XMLHttpRequest) {
return new XMLHttpRequest();
} else {
if (window.ActiveXObject) {
return new ActiveXObject("Microsoft.XMLHTTP");
} else {
}
}
}
function createAjaxObj() {
var httprequest = false;
if (window.XMLHttpRequest) {
httprequest = new XMLHttpRequest();
if (httprequest.overrideMimeType) {
httprequest.overrideMimeType("text/xml");
}
} else {
if (window.ActiveXObject) {
try {
httprequest = new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e) {
try {
httprequest = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e) {
}
}
}
}
return httprequest;
}
var httpReq = createAjaxObj();
//上边的代码是固定的。
function updateSelect(){
var selected = document.all.slt1.value;
httpReq.open("GET","testU?tid="+selected,false);
httpReq.onreadystatechange=function(){
checkReqCallBack();
};
httpReq.send(null);
}
function checkReqCallBack(){
if(httpReq.readyState == 4) {
if(httpReq.status ==200){
var xmlDoc = httpReq.responseXML.documentElement;//获得返回的XML文档
var xSel = xmlDoc.getElementsByTagName('select');
//获得XML文档中的所有<select>标记
var select_root = document.getElementById('slt2');
//获得网页中的第二个下拉框
select_root.options.length=0;
//每次获得新的数据的时候先把每二个下拉框架的长度清0
for(var i=0;i<xSel.length;i++){
var xValue = xSel[i].childNodes[0].firstChild.nodeValue;
//获得每个<select>标记中的第一个标记的值,也就是<value>标记的值
var xText = xSel[i].childNodes[1].firstChild.nodeValue;
//获得每个<select>标记中的第二个标记的值,也就是<text>标记的值
var option = new Option(xText, xValue);
//根据每组value和text标记的值创建一个option对象
try{
select_root.add(option);//将option对象添加到第二个下拉框中
}catch(e){
}
}
}else{
alert("不能得到描述信息:" + req.statusText);
}
}
}3、编写的servlet。
Java代码
package com.servlet;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dao.UserDao;
import com.vo.Shi;
public class TestU extends HttpServlet {
public String tid;
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
UserDao ud=new UserDao();
try {
response.setCharacterEncoding("GBK");
response.setContentType("text/xml");
response.setHeader("Cache-Control", "no-cache");
request.setCharacterEncoding("GBK");
response.setCharacterEncoding("UTF-8");
tid=request.getParameter("tid").toString();
ArrayList<?> list=ud.check(tid);
String xml_start = "<selects>";
String xml_end = "</selects>";
String xml = "";
Shi shi=null;
for(int i=0;i<list.size();i++){
shi=new Shi();
shi=(Shi) list.get(i);
xml+="<select><value>"+shi.getId()+"</value><text>"+shi.getName()+"</text></select>";
}
String last_xml = xml_start + xml + xml_end;
response.getWriter().write(last_xml);
} catch (Exception e) {
e.printStackTrace();
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}
package com.servlet;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.dao.UserDao;
import com.vo.Shi;
public class TestU extends HttpServlet {
public String tid;
private static final long serialVersionUID = 1L;
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
UserDao ud=new UserDao();
try {
response.setCharacterEncoding("GBK");
response.setContentType("text/xml");
response.setHeader("Cache-Control", "no-cache");
request.setCharacterEncoding("GBK");
response.setCharacterEncoding("UTF-8");
tid=request.getParameter("tid").toString();
ArrayList<?> list=ud.check(tid);
String xml_start = "<selects>";
String xml_end = "</selects>";
String xml = "";
Shi shi=null;
for(int i=0;i<list.size();i++){
shi=new Shi();
shi=(Shi) list.get(i);
xml+="<select><value>"+shi.getId()+"</value><text>"+shi.getName()+"</text></select>";
}
String last_xml = xml_start + xml + xml_end;
response.getWriter().write(last_xml);
} catch (Exception e) {
e.printStackTrace();
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request,response);
}
}总结：当一级省select改变时出发ajax，调用servlet并在servlet中调用dao层返回查找到的市级表，用ArrayList返回给servlet，在servlet中生成XML代码。
在js中用XML方式解析，（1、取得获得XML文档中的所有<select>标记，为以后的迭代准备。2、取得页面的市节点，创建一个option对象，将option对象添加到第二个下拉框中。）。
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