不需要！
先把省份的省出来，用onchange提交一个action,这个action里肯定是可以得到这个省份的名称的，根据这个省份的名称，去查询城市，查询后放到一个list里，在返回到刚才的那个页面 就可以了.actionform会保存先前选择的那个省份的。
先把省份的省出来，用onchange提交一个action,这个action里肯定是可以得到这个省份的名称的，根据这个省份的名称，去查询城市，查询后放到一个list里，在返回到刚才的那个页面 就可以了.actionform会保存先前选择的那个省份的。
http://ben.golvon.com/MainServlet?funcName=bbs_into2&service=detail&b=DV&d=web&seqNo=15579
哪位幫我看一看啊。。都二天了還沒解決。
有位仁兄幫俺做了。還是運行不了。。
這也是俺發的貼：
http://www.javatx.cn/clubPage.jsp?ccStyle=0&tID=273&ccID=9
另煩請發個例子給我：[email protected],我如果沒弄出來俺就下班回去看啊。
<html>
<head>
<title>MyHtml.html</title><meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page"><!--<link rel="stylesheet" type="text/css" href="./styles.css">--></head>
<script type="text/javascript">
function getResult(stateVal) {
var url = "servlet/SelectCityServlet?state="+stateVal;
if (window.XMLHttpRequest) {
req = new XMLHttpRequest();
}else if (window.ActiveXObject) {
req = new ActiveXObject("Microsoft.XMLHTTP");
}
if(req){
req.open("GET",url, true);
req.onreadystatechange = complete;
req.send(null);
}
}
function complete(){
if (req.readyState == 4) {
if (req.status == 200) {
var city = req.responseXML.getElementsByTagName("city");
alert(city.length);
var str=new Array();
for(var i=0;i<city.length;i++){
str[i]=city[i].firstChild.data;
}
alert(document.getElementById("city"));
buildSelect(str,document.getElementById("city"));
}
}
}
function buildSelect(str,sel) {
sel.options.length=0;
for(var i=0;i<str.length;i++) {
sel.options[sel.options.length]=new Option(str[i],str[i])
}
}
function test(){
alert("test");
}
</script>
<body>
不变的静止内容
<BR />
<BR />
<select name="state" onChange="getResult(this.value)">
<option value="">请选择</option>
<option value="zj">浙江</option>
<option value="zs">江苏</option>
</select>
<select id="city"></select>
<BR />
<BR />
不用重新刷新
</body>
</html>
import java.io.PrintWriter;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/**
* @author stephen
*
* TODO To change the template for this generated type comment go to Window -
* Preferences - Java - Code Style - Code Templates
*/
public class SelectCityServlet extends HttpServlet { public SelectCityServlet() {
super();
} public void destroy() {
super.destroy();
} public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/xml");
response.setCharacterEncoding("UTF-8");
response.setHeader("Cache-Control", "no-cache");
String state = request.getParameter("state");
StringBuffer sb = new StringBuffer("<state>");
if ("zj".equals(state)) {
sb.append("<city>杭州</city><city>湖州</city>");
} else if ("zs".equals(state)) {
sb.append("<city>南京</city><city>扬州</city><city>苏州</city>");
}
sb.append("</state>");
PrintWriter out = response.getWriter();
out.write(sb.toString());
out.close();
}}
<HEAD>
<TITLE>New Document</TITLE>
<style type="text/css">
body{font-family:Courier New, Courier}
select{font-size:8pt;font-family:Courier New, Courier}
input{font-size:8pt;font-family:Courier New, Courier}
</style>
<SCRIPT LANGUAGE="JavaScript">
var Name=new Array(3);
var Value=new Array(3);
Name[1]=new Array{"Zosatapo1","Zosatapo2","Zosatapo3","Zosatapo4"};
Name[2]=new Array("Reic Yang1","Reic Yang2","Reic Yang3","Reic Yang4"); function change()
{
selIndex = document.all("test").selectedIndex;
if(document.all("test").selectedIndex==0)
return;
for(i=document.all("test").options.length-1;i>-1;i--)
{
document.all("test").options.remove(i);
}
for(i=0;i<Name[selIndex].length;i++)
{
document.all("test").options.add(new Option(Name[selIndex][i],"name"+i));
}
} function changeEx(){
for(i=document.all("sub").options.length;i>0;i--)
{
document.all("sub").options.remove(i-1);
} if(document.all("main").selectedIndex==0){
document.all("sub").options.add(new Option("==========","-1"));
return;
} selIndex=document.all("main").selectedIndex;
for(i=0;i<Name[selIndex].length;i++)
{
document.all("sub").options.add(new Option(Name[selIndex][i],"name"+i));
} } function reset(){
for(i=document.all("test").options.length-1;i>-1;i--)
{
document.all("test").options.remove(i);
}
document.all("test").options.add(new Option("==========","-1"));
document.all("test").options.add(new Option("Zosatapo","1"));
document.all("test").options.add(new Option("Reic Yang","2"));
} function display(object){
alert(object.options[object.selectedIndex].text+" "+object.options[object.selectedIndex].value);
}
</SCRIPT>
</HEAD> <BODY BGCOLOR="#FFFFFF">
First Sample:
<br>
<font color="blue">All items will change After you Selected!</font>
<br>
<SELECT id="test" onchange="change();">
<option value="-1" selected>
==========
<option value="1">
Zosatapo
<option value="2">
Reic Yang
</SELECT>
<input name="Reset Select" type="button" value="Reset Select" onclick="reset();">
<br>
<br> Second Sample:
<br>
<font color="blue">You selected Item in Main Select will change the Sub select Content!</font>
<br>
Main Select:
<SELECT id="main" onchange="changeEx();">
<option value="-1" selected>
==========
<option value="1">
Zosatapo
<option value="2">
Reic Yang
</SELECT> Sub Select:
<SELECT id="sub" onchange="display(this);">
<option value="-1" selected>
==========
</SELECT>
<br>
<br>
</BODY>
</HTML>