RadioButtonList Class
Assembly: System.Web (in system.web.dll)
'Declaration <ValidationPropertyAttribute("SelectedItem")> _ Public Class RadioButtonList Inherits ListControl Implements IRepeatInfoUser, INamingContainer, IPostBackDataHandler 'Usage Dim instance As RadioButtonList
/** @attribute ValidationPropertyAttribute("SelectedItem") */
public class RadioButtonList extends ListControl implements IRepeatInfoUser, INamingContainer,
IPostBackDataHandler
ValidationPropertyAttribute("SelectedItem") public class RadioButtonList extends ListControl implements IRepeatInfoUser, INamingContainer, IPostBackDataHandler
Not applicable.
The RadioButtonList control provides page developers with a single-selection radio button group that can be dynamically generated through data binding. It contains an Items collection with members that correspond to individual items on the list. To determine which item is selected, test the SelectedItem property of the list.
You can specify the rendering of the list with the RepeatLayout and RepeatDirection properties. If RepeatLayout is set to RepeatLayout.Table (the default setting), the list will be rendered within a table. If it is set to RepeatLayout.Flow, the list will be rendered without any tabular structure. By default, RepeatDirection is set to RepeatDirection.Vertical. Setting this property to RepeatDirection.Horizontal will render the list horizontally.
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| This control can be used to display user input, which might include malicious client script. Check any information that is sent from a client for executable script, SQL statements, or other code before displaying it in your application. You can use validation controls to verify user input before displaying the input text in a RadioButtonList control. ASP.NET provides an input request validation feature to block script and HTML in user input. For more information, see Securing Standard Controls, How to: Protect Against Script Exploits in a Web Application by Applying HTML Encoding to Strings, and Introduction to Validating User Input in ASP.NET Web Pages. |
Accessibility
The markup rendered by default for this control might not conform to accessibility standards such as the Web Content Accessibility Guidelines 1.0 (WCAG) priority 1 guidelines. For details about accessibility support for this control, see ASP.NET Controls and Accessibility.
The following code example demonstrates how to programmatically modify the display of a RadioButtonList control.
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| The following code example uses the single-file code model and might not work correctly if copied directly into a code-behind file. This code example must be copied into an empty text file that has an .aspx extension. For more information on the Web Forms code model, see ASP.NET Web Page Code Model. |
<%@ Page Language="VB" AutoEventWireup="True" %> <!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" > <head> <title>RadioButtonList Example</title> <script language="VB" runat="server"> Sub Button1_Click(Source As Object, e As EventArgs) If RadioButtonList1.SelectedIndex > - 1 Then Label1.Text = "You selected: " & RadioButtonList1.SelectedItem.Text End If End Sub Sub chkLayout_CheckedChanged(sender As Object, e As EventArgs) If chkLayout.Checked = True Then RadioButtonList1.RepeatLayout = RepeatLayout.Table Else RadioButtonList1.RepeatLayout = RepeatLayout.Flow End If End Sub Sub chkDirection_CheckedChanged(sender As Object, e As EventArgs) If chkDirection.Checked = True Then RadioButtonList1.RepeatDirection = RepeatDirection.Horizontal Else RadioButtonList1.RepeatDirection = RepeatDirection.Vertical End If End Sub </script> </head> <body> <h3>RadioButtonList Example</h3> <form id="form1" runat="server"> <asp:RadioButtonList id="RadioButtonList1" runat="server"> <asp:ListItem>Item 1</asp:ListItem> <asp:ListItem>Item 2</asp:ListItem> <asp:ListItem>Item 3</asp:ListItem> <asp:ListItem>Item 4</asp:ListItem> <asp:ListItem>Item 5</asp:ListItem> <asp:ListItem>Item 6</asp:ListItem> </asp:RadioButtonList> <br /> <asp:CheckBox id="chkLayout" OnCheckedChanged="chkLayout_CheckedChanged" Text="Display Table Layout" Checked="true" AutoPostBack="true" runat="server" /> <br /> <asp:CheckBox id="chkDirection" OnCheckedChanged="chkDirection_CheckedChanged" Text="Display Horizontally" AutoPostBack="true" runat="server" /> <br /> <asp:Button id="Button1" Text="Submit" onclick="Button1_Click" runat="server"/> <br /> <asp:Label id="Label1" font-names="Verdana" font-size="8pt" runat="server"/> </form> </body> </html>
- AspNetHostingPermission for operating in a hosted environment. Demand value: LinkDemand. Permission value: Minimal.
- AspNetHostingPermission for operating in a hosted environment. Demand value: InheritanceDemand. Permission value: Minimal.
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