在 JS中获取下拉框的值真是要费很多周章，比起在ASP。NET中来就麻烦多了
< html >
< head >
< title >List< /title >
< meta http-equiv="Content-Type" content="text/html; charset=gb2312" >
< script LANGUAGE="javascript" >
< !--
var onecount;
onecount=0;
subcat = new Array();
subcat[0] = new Array("徐汇区","01","001");
subcat[1] = new Array("嘉定区","01","002");
subcat[2] = new Array("黄浦区","01","003");
subcat[3] = new Array("南昌市","02","004");
subcat[4] = new Array("九江市","02","005");
subcat[5] = new Array("上饶市","02","006");
onecount=6;
function changelocation(locationid)
{
document.myform.smalllocation.length = 0;
var locationid=locationid;
var i;
document.myform.smalllocation.options[0] = new Option('====所有地区====','');
for (i=0;i < onecount; i++)
{
if (subcat[i][1] == locationid)
{
document.myform.smalllocation.options[document.myform.smalllocation.length]
= new Option(subcat[i][0], subcat[i][2]);
}
}
}
//-- >
< /script >
< /head >
< body >
< form name="myform" method="post" >
< select name="biglocation"
onChange="changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value)" >
< option value="01" selected >上海< /option >
< option value="02" >江西< /option >
< /select >
< select name="smalllocation" >
< option selected value="" >==所有地区==< /option >
< /select >
< /form >
< script LANGUAGE="javascript" >
< !--
changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value);
//-- >
< /script >
< /body >
< /html >
