<select name="aaa" onChange="window.open('bbb.jsp?province=this.value, 'actionFrame')">其中actionFrame为<iframe name="actionFrame" width="0" height="0"></iframe>在bbb.jsp里输出javascript操作aaa
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在jsp的头上
然后整个处理过程都是通过js实现
<xml id="City">
<?xml version="1.0" encoding="gb2312"?>
<root>
<cityinfo shengfen='1' chengshiID='1' chengshiName="南京">
<cityinfo shengfen='1' chengshiID='2' chengshiName="无锡">
</root>
</xml>
js为
<script language="javascript">
function createOptions(text,value,selected)
{
var obj=document.createElement("OPTION");
obj.text=text;
obj.value=value;
obj.selected=selected;
return obj;
}
function changeshengfen()
{
var root = City.documentElement;
var cityNode= root.selectNodes("//cityinfo");
for(var i=0;i<cityNode.length;i++)
{
if(cityNode.item(i).getAttribute("shengfen")==document.all("_shengfen").value)
document.all("_shengfen").add(createOptions(cityNode.item(i).getAttribute("chengshiName"),cityNode.item(i).getAttribute("chengshenID"),false));
}
}
对“下拉框1”进行判断返回至javabean 可以读去数据库或数组
然后返回相应的数据
产生相应的 “下拉框2 “
当下拉框1的选项改变后,下拉框2随着变
我在http://expert.csdn.net/Expert/topic/2501/2501843.xml?temp=.7281中贴过
原文如下:<%@ page contentType="text/html;charset=GBK"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.text.*"%>
<%@page import="java.util.Date"%>
<%@page import="DataBase.*"%>
<jsp:useBean id="p" scope="page" class="page.page"/>
<%
ResultSet rs=null;
String depid="";
opendb op=null;
String departmentid="";
int count=0;
String name1="";
try{
op=new opendb();
%><SCRIPT LANGUAGE="JavaScript">
<!-- Begin
var arrItems1 = new Array();
var arrItemsGrp1 = new Array();
<%
rs=op.getdb("select name,operator_id,usercount,department_id from tb_operator");
while(rs.next()){
count++;
name1=rs.getString("usercount");
%>
arrItems1[<%=count%>] = <%="\""+name1+"\""%>;
arrItemsGrp1[<%=count%>] = <%=rs.getInt("department_id")%>;
<%}rs.close();
%>function selectChange(control, controlToPopulate, ItemArray, GroupArray)
{
var myEle ;
var x ;
// Empty the second drop down box of any choices
for (var q=controlToPopulate.options.length;q>=0;q--) controlToPopulate.options[q]=null;myEle = document.createElement("option") ;
myEle.value = 0 ;
myEle.text = "[SELECT]" ;
controlToPopulate.add(myEle) ;
for ( x = 0 ; x < ItemArray.length ; x++ )
{
if ( GroupArray[x] == control.value )
{
myEle = document.createElement("option") ;
myEle.value = x ;
myEle.text = ItemArray[x] ;
controlToPopulate.add(myEle) ;
}
}
}
// End -->
</script><form name=myChoices>
<table align="center">
<tr>
<td>
<SELECT id=firstChoice name=firstChoice onchange="selectChange(this, myChoices.secondChoice, arrItems1, arrItemsGrp1);">
<option value=0 SELECTED>[SELECT]</option>
<%rs=op.getdb("select department_id,department_name from tb_department ");
while(rs.next())
{%>
<option value=<%=rs.getInt("department_id")%>><%=rs.getString("department_name")%></option>
<%}rs.close();%>
</SELECT>
</TD><TD>
<SELECT id=secondChoice name=secondChoice >
</SELECT>
</TD>
</TR>
</TABLE>
</form>
<%
} finally{
op.conclose();
}%>
<script language="JavaScript">
//读取城市名数据
var z=new Array();
<%
ResultSet rsdockscri=null;
rsdockscri=dbop.exeSelect("select * from 城市表");
int idockscri=0;
while(rsdockscri.next()){
%>
z[<%=idockscri%>]="<%=rsdockscri.getString("code")%>::<%=rsdockscri.getString("Descript")%>::<%=rsdockscri.getString("sscode")%>"; //其中code 为和省份关联的字段 sscode为城市代码
<%
idockscri++;
}
if(rsdockscri!=null) rsdockscri.close();
%>var area_1="";
function tdock_Change()
{
var tempArrayti;
if(frm.tsfname.options(frm.tsfname.selectedIndex).value!=""){
area_1 = frm.tsfname.options(frm.tsfname.selectedIndex).value;
DoArea_2_Content();
}else{
removeSelectItem(frm.tssname);
}
}
function DoArea_2_Content()
{
var s,e,i,t,tempArrayti;
s=frm.tssname;
removeSelectItem(s);
frm.tssname.options(0).selected=true;
for(i=0;i<z.length;i++)
{
tempArrayti=z[i].split("::");
if(tempArrayti[0]==area_1)
{
e=document.createElement("OPTION");
e.text=tempArrayti[1];
e.value=tempArrayti[2];
s.add(e);
}
}
}
function removeSelectItem(s)
{
var i;
for(i=s.length-1;i>0;i--)
{
s.remove(i);
}
}
</script><body>
<select name="tsfname" tabindex="25" onChange="tdock_Change();">
<option>--请选择省份--</option>
<%
ResultSet rsdock=dbop.exeSelect("select * from 省份的表");
while(rsdock.next()){
%>
<option value="<%=rsdock.getString("code")%>"><%=rsdock.getString("Descript")%></option>
<%
}
rsdock.close();
%>
</select>
<select name="tssname" tabindex="26">
<option>--请选择城市--</option>
</select>
</body>