请教有关级联的问题!!!

Question

请看http://expert.csdn.net/Expert/topic/1965/1965486.xml?temp=.9115717

Answer 1

<%@ 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();
}%>

Answer 2

CSDN  javascript版FAQ中有很经典的例子,可支持四级联动