小胖帮忙解决了用JS实现的连动，同时我用另外一种方法实现了 ，自此对脚本的数组和select有了新的认识
<%@ page contentType="text/html; charset=GB18030" %><%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %><%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %><%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %><%@page import="checkNumber.CityBean" %><%@page import="java.util.ArrayList" %><html><head><title>selectTest</title></head><body bgcolor="#ffffff"><a href="select2Action.do">GO</a>
<form method="post" action="selectTest.jsp"><br><br>select1<select name="select1" οnchange="select2Show(this)"> <option value="0" selected="selected">--select--</option> <option value="1">湖北</option> <option value="2">河南</option></select>
<br>select2<select name="select2"> <option value="0" selected="selected">--select--</option>
</select>
<input type="submit" name="Submit" value="Submit"><input type="reset" value="Reset"></form></body></html>
<script language="javascript">var qq=new Array();var count=0;<%ArrayList list=null;CityBean bean=new CityBean();if(request.getAttribute("citylist")!=null){ list=(ArrayList)request.getAttribute("citylist"); for(int i=0;i<list.size();i++) { bean=(CityBean)list.get(i);%> qq[count]=new Array("<%=bean.getProvinceId()%>","<%=bean.getId()%>","<%=bean.getCityName()%>"); count++; // 方法三：// qq.push(CreateNewOperion("<%=bean.getProvinceId()%>","<%=bean.getId()%>","<%=bean.getCityName()%>"));<% }}%>
function select2Show(s){ ClearAll(document.all.select2); for(var j=0;j<count;j++) { if(s.value==qq[j][0]) { var op=new Option();// //方法二// document.all.select2.options[j]=new Option(qq[j][2], qq[j][1]); // 方法一 op.value=qq[j][1]; op.text=qq[j][2]; document.all.select2.add(op,j); } } // 方法三：// ClearAll(document.all.select2);// for(var j=0;j<qq.length;j++)// {//// if(s.value==qq[j].id){// alert(qq[j].id);// document.all.select2.add(qq[j]);}// }}
function CreateNewOperion(optionId,optionValue,optionText){ var newOption=new Option(); newOption.id=optionId; newOption.value=optionValue; newOption.text=optionText; return newOption;}
function ClearAll(selectobj){ for(var i=selectobj.options.length;i>0;i--) selectobj.options.remove(0);}</script>
