Jsp+javascript打造二级级联下拉菜单 -

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Jsp+javascript打造二级级联下拉菜单

JSP JavaScript SQL SUN HTML

Jsp+javascript打造二级级联下拉菜单

数据库需求分析：
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" prefix="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>

<%String sql="select * from Nclass order by NclassId asc";
ResultSet rs=stmt.executeQuery(sql);
%>

<script type="text/javascript">
var onecount;
onecount=0;
subcat = new Array();
        <%
        int count = 0;
        while(rs.next()){
        %>
subcat[<%=count%>] = new Array("<%=rs.getString("NclassName")%>","<%=rs.getString("NclassId")%>","<%=rs.getString("parentId")%>");
        <%
        count++;
        }
        rs.close();
        %>
onecount=<%=count%>;

function changelocation(locationid)
    {
    document.myform.NclassId.length = 0;

    var locationid=locationid;
    var i;
    for (i=0;i < onecount; i++)
        {
            if (subcat[i][2] == locationid)
            {
                document.myform.NclassId.options[document.myform.NclassId.length] = new Option(subcat[i][0], subcat[i][1]);
            }
        }

    }
</script>

<FORM method="POST" name="myform" action="adminsave.jsp?action=add">
<TABLE>

    <TR>
      <TD>一级分类</TD>
      <TD>
        <SELECT name="classId" onChange="changelocation(document.myform.classId.options[document.myform.classId.selectedIndex].value)" size="1">
          <OPTION selected value>==请选一级分类==</OPTION>
        <sql:query var="query" dataSource="${bookdev}">
          SELECT * FROM class
       </sql:query>
<c:forEach var="row" items="${query.rows}">
<option value="${row.classId}">${row.className}</option>
</c:forEach>
</select>
      </TD>
      <TD>选择二级分类</TD>
      <TD>
        <SELECT name="NclassId">
          <OPTION selected value>==请选二级分类==</OPTION>
        </SELECT>
      </TD>
    </TR>
</TABLE>

</FORM>
</BODY>
</HTML>

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