ASP.net中响应dropdownlist里OnSelectedIndexChanged事件的代码怎么写?

NetCop 2003-01-07 03:00:18

为什么我做的没反应?

Sub listChange(obj as Object, e as EventArgs)
response.Write("aaa")
End Sub

<form run="server">
<asp:dropdownlist ID="dropdownlist1" AutoPostBack="true" OnSelectedIndexChanged="listChange" DataTextField="DepName" DataValueField="DepID" runat="server"></asp:dropdownlist>
</form>

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raychiu 2003-01-07

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Private Sub DropDownList1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DropDownList1.SelectedIndexChanged
'改这里
If DropDownList1.SelectedIndex = 1 Then
Response.Write("ssss")

End If

End Sub

至于那两句还是要啊，

seabell 2003-01-07

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<%@ Page Language="VB" EnableViewState="true" %>

NetCop 2003-01-07

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楼上,正因为那样没用,所以才把那两句给去掉的.
谢谢你.

raychiu 2003-01-07

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<%@ Page Language="VB" EnableViewState="false" %>
<%@ import Namespace="System.Data" %>
<%@ import Namespace="System.Data.OLEDB" %>
<script language="VB" runat="server">
Dim strConnectionString as string=ConfigurationSettings.appSettings("DSN")
Dim Conn as New OleDbConnection(strConnectionString)
Dim strSql as string
Function CreateDataSet(strQuery as string)
Dim objCmd as new OleDbDataAdapter(strQuery,conn)
Dim ObjDs as DataSet = New DataSet()
objCmd.fill(objDs)
return objDs
End Function
Sub Page_Load(obj as Object, e as EventArgs)
Conn.open
strSQL="select depID,DepName from tbDepartment order by DepID"
If Not IsPostBack Then' “改这里”
listDepartment.DataSource = CreateDataSet(strSQL)
listDepartment.DataBind()
End If ’“和这里”
End Sub
Sub listChange(obj as Object, e as EventArgs)
response.Write("aaa")
End Sub
</script>
<html>
<head>
</head>
<body leftmargin="0" topmargin="0">
<form runat="server">
<p align="left"><asp:dropdownlist ID="listDepartment" AutoPostBack="true" OnSelectedIndexChanged="listChange" DataTextField="DepName" DataValueField="DepID" runat="server"></asp:dropdownlist></p><p> </p>
</form>
</body>
</html>

NetCop 2003-01-07

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楼上的,请仔细看代码:)

各位,在新文件中使用以下代码,无法触发OnSelectedIndexChanged事件.
<%@ Page Language="VB" EnableViewState="false" %>
<%@ import Namespace="System.Data" %>
<%@ import Namespace="System.Data.OLEDB" %>
<script language="VB" runat="server">
Dim strConnectionString as string=ConfigurationSettings.appSettings("DSN")
Dim Conn as New OleDbConnection(strConnectionString)
Dim strSql as string
Function CreateDataSet(strQuery as string)
Dim objCmd as new OleDbDataAdapter(strQuery,conn)
Dim ObjDs as DataSet = New DataSet()
objCmd.fill(objDs)
return objDs
End Function
Sub Page_Load(obj as Object, e as EventArgs)
Conn.open
strSQL="select depID,DepName from tbDepartment order by DepID"
'If Not IsPostBack Then
listDepartment.DataSource = CreateDataSet(strSQL)
listDepartment.DataBind()
'End If
End Sub
Sub listChange(obj as Object, e as EventArgs)
response.Write("aaa")
End Sub
</script>
<html>
<head>
</head>
<body leftmargin="0" topmargin="0">
<form runat="server">
<p align="left"><asp:dropdownlist ID="listDepartment" AutoPostBack="true" OnSelectedIndexChanged="listChange" DataTextField="DepName" DataValueField="DepID" runat="server"></asp:dropdownlist></p><p> </p>
</form>
</body>
</html>

raychiu 2003-01-07

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我想不是你的程序问题是设置问题，将下拉列表的autopostback 属性设为 true吧！否则就要用javascript 写了。

NetCop 2003-01-07

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新建一个文件,该文件里只包含以上代码,没有问题出现,可能是其他代码有错.

NetCop 2003-01-07

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当然在runat=server中.
<script language="VB" runat="server">
Sub listChange(obj as Object, e as EventArgs)
response.Write("aaa")
End Sub
</script>

<form runat="server">
<asp:dropdownlist ID="dropdownlist1" AutoPostBack="true" OnSelectedIndexChanged="listChange" DataTextField="DepName" DataValueField="DepID" runat="server"></asp:dropdownlist>
</form>