我有一个简单的ASP.NET表单,带有DropDownList和两个RadioButtons(两者都共享相同的GroupName).
在DropDownList的SelectedIndexChanged事件中,我在两个RadioButtons上设置Checked = true.
它设置第二个RadioButton很好,但它不会检查第一个.我究竟做错了什么？
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication3._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<form id="form1" runat="server">
<asp:DropDownList runat="server" AutoPostBack="true" OnSelectedIndexChanged="ddl_Changed"
ID="ddl">
<asp:ListItem Text="Foo" />
<asp:ListItem Text="Bar" />
</asp:DropDownList>
<asp:RadioButton runat="server" ID="rb1" Text="Foo" GroupName="foobar" />
<asp:RadioButton runat="server" ID="rb2" Text="Bar" GroupName="foobar" />
</form>
</body>
</html>
protected void ddl_Changed(object sender,EventArgs e)
{
if (ddl.SelectedIndex == 0)
rb1.Checked = true; // <- Doesn't actually work
else
rb2.Checked = true;
}
解决方法
它失败了,因为它试图将它们都设置为选中,这对于组中的无线电按钮是不可能的.
<asp:RadioButtonList ID="rblTest" runat="server"> <asp:ListItem Text="Foo"></asp:ListItem> <asp:ListItem Text="Bar"></asp:ListItem> </asp:RadioButtonList>
然后像这样设置所选项目：
protected void ddl_Changed(object sender,EventArgs e)
{
rblTest.ClearSelection();
rblTest.SelectedIndex = ddl.SelectedIndex;
}
