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ASP三级联动，实现与数据库连接的下拉菜单控制下拉菜单，无刷新
<%
Option Explicit
'数据库：
'location
'表1 loaction 所在的市 表
' 字段
' loactionid （主键）
' loactionname 名字
'表2 district 所在的县 表
' 字段
' locationid （主键）
' districtid
' districtname
'表3 village 所在的乡镇 表
' 字段
' districtid （主键）
' villageid
' villagename
%>
<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
dim rs2
dim sql2
dim count2
dim connstr
connstr="DBQ="+server.mappath("db11.mdb")+";DefaultDir=;DRIVER={Microsoft Access Driver (*.mdb)};"
set conn=server.createobject("ADODB.CONNECTION")
conn.open connstr
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;
document.myform.dlmc0.length = 0;
document.myform.dlmc0.options[0] = new Option('==请选择乡镇==','');
var locationid=locationid;
var i;
document.myform.smalllocation.options[0] = new Option('==请选择县==','');
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>
<%sql2 = "select * from village order by districtid asc"
set rs2 = conn.execute(sql2)
%>
<script language = "JavaScript">
var onecount2;
onecount2=0;
subcat2 = new Array();
<%
count2 = 0
do while not rs2.eof
%>
subcat2[<%=count2%>] = new Array("<%= trim(rs2("villagename"))%>","<%= trim(rs2("districtid"))%>","<%= trim(rs2("villagename"))%>");
<%
count2 = count2 + 1
rs2.movenext
loop
rs2.close
set rs2=nothing
%>
onecount2=<%=count2%>;
function changelocation2(villageid)
{
document.myform.dlmc0.length = 0;
var villageid=villageid;
var j;
document.myform.dlmc0.options[0] = new Option('==请选择乡镇==','');
for (j=0;j < onecount2; j++)
{
if (subcat2[j][1] == villageid)
{
document.myform.dlmc0.options[document.myform.dlmc0.length] = new Option(subcat2[j][0], subcat2[j][2]);
}
}
}
</script>
</head>
<body>
<form action="untitled1.asp" method="post" name="myform">
<p><br>
<select name="biglocation" onChange="changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value)" size="1">
<option selected>请选择市</option>
<%
sql1 = "select * from loaction order by loactionname asc"
set rs1 = conn.Execute (sql1)
do while not rs1.eof
%>
<option value="<%=trim(rs1("loactionid"))%>"><%=trim(rs1("loactionname"))%></option>
<%
rs1.movenext
loop
rs1.close
set rs1 = nothing
conn.Close
set conn = nothing
%>
</select>
</p>
<p>
<select name="smalllocation" onChange="changelocation2(document.myform.smalllocation.options[document.myform.smalllocation.selectedIndex].value)">
<option selected value="">==请选择县==</option>
</select>
</p>
<p>
<select name="dlmc0" size="1">
<option value="-1" selected>==请选择乡镇==</option>
</select>
</p>
<p> <br>
<input type="submit" name="Submit" value="Submit">
<br>
</p>
</form>
</body>
</html>
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