高分,....在线等........解决马上结贴...........简单问题

[winte]

我在网页上放了一个radioButtonlist默认状态没有被选中的项目,我现在想当用户按提交按钮时判断用户是否以选中了其中的一项,如果没选结出一个对话框提示....也就是问用什么属性来判断RadioButtonList是否有项目被选中,只求这个属性....急.......

[xnice]

if(RadioButtonList.selectedItem.value==null)

[winte]

不对啊,兄弟,-------------------------------------------------------------

Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: BC30201: 需要表达式。

Source Error:

Line 17: <script runat="server">
Line 18: Sub tj_click(Src As Object, E As EventArgs)
Line 19: if test.selectedItem.value==null then
Line 20: response.Write("ok")
Line 21: else

Source File: H:\web\vote\test.aspx Line: 19

[暗石绿]

if(RadioButtonList1.SelectedIndex == -1)
{
Response.Write("没有选中");

}
else
{
Response.Write("选中了");
}

[孟子E章]

http://lucky_elove.www1.dotnetplayground.com/ShowDetail.aspx?id=7AE7D20A-A5DA-4303-AC2D-32046BE4D086

[tix66]

RadioButtonList1.SelectedIndex表示选择项的索引,当没有选择项时其值为-1

[阿森纳2013]

<asp:RadioButtonList id="RadioButtonList1" runat="server"></asp:RadioButtonList>
<asp:RequiredFieldValidator ControlToValidate="RadioButtonList1" id="RequiredFieldValidator1" runat="server" ErrorMessage="还未选择"></asp:RequiredFieldValidator>