从数据库中动态选取下拉列表的方法

有一页填表的页面，其中有几个下拉表单是通过一个表的某个字段动态生成，比如省下面的城市名，希望选择某一个

省即可自动在另一下拉表单内生成城市名，.....然后提交给asp处理加入到另外一个表内。



　　终于完成了，代码如下，可能比较乱，不过还是很有效的，不用刷新页面。

大家不妨一试~~~~~~~~

<%

OpenDB objConn, "xxxx"

Set RSClass = objConn.Execute("SELECT * FROM class Order by fldClass")

If RSClass.EOF Then    

Response.Write "没有记录。
"



Else



      Response.Write "
        " ONCHANGE=""classselected(this);"" >"

        sJavaScript = "function classselected(elem){" &_

         vbCrlf & _

        "for (var i = document.f1.sort.options.length; i >= 0; i--){" & vbCrlf & _

        "document.f1.sort.options[i] = null;" & _

         vbCrlf

   Do Until RSClass.EOF

     If sLastClass <> RSClass("fldClass") Then

         sLastClass = RSClass("fldClass")

        Response.Write "" & sLastClass & ""

         sJavaScript = sJavaScript & "}" & vbCrlf & _

                "if (elem.options[elem.selectedIndex].value==" & _

                 RSClass("fldID") & "){" & vbCrlf

      End If

         sJavaScript = sJavaScript & _

                 "document.f1.sort.options[document." & _

                 "f1.sort.options.length] = new Option('" & _

                  RSClass("fldSort") & "','" & RSClass("fldID") & "');" & _

                  vbCrlf

     RSClass.MoveNext

     Loop

        Response.Write ""

        Response.Write ""

        Response.Write "[请选择]"

        Response.Write ""

    

        sJavaScript = sJavaScript & vbCrlf & "}" & vbCrlf & "}" & vbCrlf

        Response.Write "" & vbCrlf

        Response.Write sJavaScript & vbCrlf & "" & vbCrlf

End If

RSClass.Close

Set RSClass = Nothing%>