Web Server Controls->ASP.NET RadioButton Control
Definition and Usage
The RadioButton control is used to display a radio button.
Tip: To create a set of radio buttons using data binding, use the RadioButtonList control!
Properties
| Property | Description |
|---|---|
| AutoPostBack | A Boolean value that specifies whether the form should be posted immediately after the Checked property has changed or not. Default is false |
| Checked | A Boolean value that specifies whether the radio button is checked or not |
| id | A unique id for the control |
| GroupName | The name of the group to which this radio button belongs |
| OnCheckedChanged | The name of the function to be executed when the Checked property has changed |
| runat | Specifies that the control is a server control. Must be set to "server" |
| Text | The text next to the radio button |
| TextAlign | On which side of the radio button the text should appear (right or left) |
Examples
Radiobutton
ASPX Source:
| <script runat="server"> Sub submit(Sender As Object, e As EventArgs) if red.Checked then Label1.Text="You selected " & red.Text elseIf green.Checked then Label1.Text="You selected " & green.Text elseIf blue.Checked then Label1.Text="You selected " & blue.Text end if End Sub </script> <html> <body> <form runat="server"> Select your favorite color: <br /> <asp:RadioButton id="red" Text="Red" Checked="True" GroupName="colors" runat="server"/> <br /> <asp:RadioButton id="green" Text="Green" GroupName="colors" runat="server"/> <br /> <asp:RadioButton id="blue" Text="Blue" GroupName="colors" runat="server"/> <br /> <asp:Button text="Submit" OnClick="submit" runat="server"/> <p><asp:Label id="Label1" runat="server"/></p> </form> </body> </html> |
Output Result:
| Select your favorite color: |
If you click the radiobutton "Green" and then click the button "Submit",it will show:
| Select your favorite color: You selected Green |
In this example we declare three RadioButton controls, one Button control, and one Label control in an .aspx file. When the submit button is triggered, the submit subroutine is executed. The submit subroutine may respond in three ways: if the radiobutton with id="red" is selected, the server sends the message "You selected Red" to the Label control. If the radiobutton with id="green" is selected, the server sends the message "You selected Green" to the Label control. If the radiobutton with id="green" is selected, the server sends the message "You selected Blue" to the Label control.
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