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网上三级菜单多是多但是代码都比较烦，我这个应该说还是比较直观的：

========================================================

'肯定先要连接数据库了，不用说了

'数据库结构

'类别1表名称：a字段：ID,Name说明：ID为主键是类别1的ID值，Name为类别1的名称

'类别2表名称：aa字段：ID,aID,Name说明：ID为主键是类别2的ID值，aID为所属类别1的ID值，Name为类别2的名称

'类别3表名称：aaa字段：ID,aID,aaID,Name说明：ID为主键是类别3的ID值，aID为所属类别1的ID值，aaID为所属类别2的ID值，Name为类别3的名称

=====test1.asp 你可以测试下，接收到的都是类别的ID值====

<%

response.write"1:"&Request.form("s1")&"<BR>"

response.write"2:"&Request.form("s2")&"<BR>"

response.write"3:"&Request.form("s3")&"<BR>"

%>

=========================================================

<!-- 三级联动菜单 开始 -->

<script language="JavaScript">

<!--

<%

'二级数据保存到数组

Dim count2,rsClass2,sqlClass2

set rsClass2=server.createobject("adodb.recordset")

sqlClass2="select * from aa"

rsClass2.open sqlClass2,conn,1,1

%>

var subval2 = new Array();

伊图教程网[www.etoow.com]

http://www.etoow.com/html/2007-02/1170469109.html

//数组结构：一级根值,二级根值,二级显示值

<%

count2 = 0

do while not rsClass2.eof

%>

subval2[<%=count2%>] = new Array('<%=rsClass2("aID")%>','<%=rsClass2("ID")%>','<%=rsClass2("Name")%>')

<%

count2 = count2 + 1

rsClass2.movenext

loop

rsClass2.close

%>

<%

'三级数据保存到数组

Dim count3,rsClass3,sqlClass3

set rsClass3=server.createobject("adodb.recordset")

sqlClass3="select * from aaa"

rsClass3.open sqlClass3,conn,1,1

%>

var subval3 = new Array();

//数组结构：二级根值,三级根值,三级显示值

<%

count3 = 0

do while not rsClass3.eof

%>

subval3[<%=count3%>] = new Array('<%=rsClass3("aaID")%>','<%=rsClass3("ID")%>','<%=rsClass3("Name")%>')

<%

count3 = count3 + 1

rsClass3.movenext

loop

rsClass3.close

%>

function changeselect1(locationid)

{

document.form1.s2.length = 0;

document.form1.s2.options[0] = new Option('==请选择类别==','');

document.form1.s3.length = 0;

document.form1.s3.options[0] = new Option('==请选择专题==','');

for (i=0; i<subval2.length; i++)

{

if (subval2[i][0] == locationid)

{document.form1.s2.options[document.form1.s2.length] = new Option(subval2[i][2],subval2[i][1]);}

}

}

function changeselect2(locationid)

{

document.form1.s3.length = 0;

document.form1.s3.options[0] = new Option('==请选择专题==','');

for (i=0; i<subval3.length; i++)

{

if (subval3[i][0] == locationid)

{document.form1.s3.options[document.form1.s3.length] = new Option(subval3[i][2],subval3[i][1]);}

}

}

//-->

</script>

<form name="form1" method="post" action="test1.asp">

伊图教程网[www.etoow.com]

http://www.etoow.com/html/2007-02/1170469109-1.html

三级联动：

<%

Dim count1,rsClass1,sqlClass1

set rsClass1=server.createobject("adodb.recordset")

sqlClass1="select * from a"

rsClass1.open sqlClass1,conn,1,1

%>

<select name="s1" onChange="changeselect1(this.value)">

<option>==请选择频道==</option>

<%

count1 = 0

do while not rsClass1.eof

response.write"<option value="&rsClass1("ID")&">"&rsClass1("Name")&"</option>"

count1 = count1 + 1

rsClass1.movenext

loop

rsClass1.close

%>

</select>

<select name="s2"onChange="changeselect2(this.value)">

<option>==请选择类别==</option>

</select>

<select name="s3">

<option>==请选择专题==</option>

</select>

<input type="submit" name="Submit" value="提交"></form>

<!-- 三级联动菜单 结束 -->

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