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下拉框连动的小例子（数据库版）

March 25,2004

【钢铁工人】于 2000-11-2 10:35:06 加贴在 Joy ASP ↑：

ASP文件：
<%@ 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[1] == locationid)
         {
            document.myform.smalllocation.options[document.myform.smalllocation.length] = new Option(subcat[0], subcat[2]);
         }
      }

}
</script>
</head>
<body>
<form name="myform" method="post">
<select name="biglocation" onChange="changelocation(document.myform.biglocation.options[document.myform.biglocation.selectedIndex].value)">
      <%

      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 name="smalllocation">
      <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>

数据库：
create table location
(

locationid char(2) not null primary key,
locationname char(50) not null

)

create table district
(

districtid char(3) not null primary key,
districtname char(50) not null,
locationid char(2) not null
)