主题：[讨论]asp中的<select>事件问题？
wyj82
[专家分：10] 发布于 2008-02-15 22:40:00
要求有三个下拉框，第一个下拉框选择后，更新第二个<select>数据，选择第二个时更新第三个数据？急
要求有三个下拉框，第一个下拉框选择后，更新第二个<select>数据，选择第二个时更新第三个数据？急
回复列表 （共4个回复）
沙发
linxuanxu [专家分：9360] 发布于 2008-02-16 13:28:00
通过JS实现。
板凳
hcn008 [专家分：380] 发布于 2008-02-16 14:14:00
就是所谓的三级联动，我有一个。
3 楼
wyj82 [专家分：10] 发布于 2008-02-17 12:54:00
我的<select>中的数据都是从数据库中取出拉的。怎么通过把数据取出来然后用js实现三级联动啊
4 楼
JavaAndJDK [专家分：10] 发布于 2008-02-21 09:05:00
给你个例子你好好看看：二级联动的
<%@ Language=VBScript %>
<%Option Explicit%>
<html>
<head>
<title>List</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<%
dim conn
dim rs
dim sql
dim count
dim rs1
dim sql1
set conn = server.CreateObject ("adodb.connection")
conn.Open "test","sa",""
sql = "select * from district order by locationid asc"
set rs = conn.execute(sql)
%>
<script language = "JavaScript">
var onecount;
onecount=0;
subcat = new Array();
<%
count = 0
do while not rs.eof
%>
subcat[<%=count%>] = new Array("<%= trim(rs("districtname"))%>","<%= trim(rs("locationid"))%>","<%= trim(rs("districtid"))%>");
<%
count = count + 1
rs.movenext
loop
rs.close
set rs=nothing
%>
onecount=<%=count%>;
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 method="post">
<select >
<%
sql1 = "select * from location order by locationname asc"
set rs1 = conn.Execute (sql1)
do while not rs1.eof
%>
<option value="<%=trim(rs1("locationid"))%>"><%=trim(rs1("locationname"))%></option>
<%
rs1.movenext
loop
rs1.close
set rs1 = nothing
conn.Close
set conn = nothing
%>
</select>
<select >
<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>
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