jsp中,使用js生成动态的数据库相关的二级联动下拉框

<head>
<title>后台产品添加</title>
<meta http-equiv="Content-Type" content="text/HTML; charset=gb2312">
<link href="../INC/Style.Css" rel="stylesheet" type="text/css">

 

<script language = "JavaScript">
var onecount;
onecount=0;
subcat = new Array();
 <%
 int count = 0;
 rs = Conn.executeQuery("select * from ego_smallsort order by Sid");//读取数据
while(rs.next())
{
String sname=new String(rs.getString("Sname").getBytes("GBK"),"ISO8859_1");//转换字符类型
%>
subcat[<%=count%>] = new Array("<%=sname%>","<%=rs.getInt("Bid")%>","<%=rs.getInt("Sid")%>");//产生数组
<%
        count = count + 1;
}
%>
onecount=<%=count%>;

 

function changelocation(id)
    {
    document.form1.smallsortselect.length = 0;

 

    var id=id;
    var i;
    document.form1.smallsortselect.options[0] = new Option('选择二级分类','');
    for (i=0;i < onecount; i++)
        {
            if (subcat[i][1] == id)
            {
                document.form1.smallsortselect.options[document.form1.smallsortselect.length] = new Option(subcat[i][0], subcat[i][2]);
            }       
        }
       
    }     
   
</script>
</head>
<body bgcolor="#FFFFFF">

 

<form name="form1" method="post" action="">
<table width="500"  border="0" cellspacing="0" cellpadding="0" align="center">
  <tr>
    <td width="180" height="20" align="right">选择一级分类:</td>
    <td width="320">
  <select name="bigsortselect" onChange="changelocation(document.form1.bigsortselect.options[document.form1.bigsortselect.selectedIndex].value)" size="1">
    <option value="2">请选择一级分类</option>
<%
 rs = Conn.executeQuery("select * from ego_bigsort order by Bid");
while(rs.next())
{
 String Bname = new String(rs.getString("Bname").getBytes("GBK"),"ISO8859_1");
 System.out.println(Bname);
%>
   <option value="<%=rs.getInt("Bid")%>"><%=Bname%></option>
<%
}
%>
     </select><br>
    </td>
  </tr>
  <br>
  <tr>
    <td height="20" align="right">选择二级分类:</td>
    <td>
  <select name="smallsortselect">
    <option value="" selected>请选择二级分类</option>

 

     </select> 

 

 </td>
  </tr>
  <tr>
    <td height="20" colspan="2" align="center"><input type="submit" name="Submit" value="提交"></td>
  </tr>
<script LANGUAGE="JavaScript">
    changelocation(document.form1.bigsortselect.options[document.form1.bigsortselect.selectedIndex].value); //将一级分类的value传给changelocation()函数,生成二级分类的列表

</script>
</table>
</form>

 

</body>
</html>