JSP+JavaScript打造二级级联下拉菜单:
class(一级栏目信息):classId(自动编号),className(栏目名称), Nclass(二级栏目信息), NclassId(自动编号),NclassName(栏目名称),parentId(一级栏目id,与class表中的classId关联)
<%@ page contentType=text/html; charset=GB2312 language=java errorPage=../error.jsp %>
<%@ include file=../conn.jsp%>
<%@ include file=../ds.jsp%>
<%@ taglib uri=http://java.sun.com/jsp/jstl/sql divfix=sql %>
<%request.setCharacterEncoding(gb2312); %>
<HTML><HEAD>
<META http-equiv=Content-Type content=text/html; charset=gb2312>
<TITLE>级联菜单</TITLE>
<LINK rel=stylesheet type=text/css href=style.css>
</HEAD>
<!--从数据库中得到二级栏目信息-->
<%String sql=select * from Nclass order by NclassId asc;
ResultSet rs=stmt.executeQuery(sql);
%>
<!--将二级栏目信息保存到数组subcat中-->
<script type=text/javascript>
var _disibledevent=</OPTION>
</SELECT>
</TD>
</TR>
</TABLE>
</FORM>
</BODY>
</HTML>