HtmlInputRadioButton.RenderAttributes(HtmlTextWriter) Method
Definition
Important
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Renders the HtmlInputRadioButton control attributes to the specified HtmlTextWriter object.
protected:
override void RenderAttributes(System::Web::UI::HtmlTextWriter ^ writer);protected override void RenderAttributes(System.Web.UI.HtmlTextWriter writer);override this.RenderAttributes : System.Web.UI.HtmlTextWriter -> unitProtected Overrides Sub RenderAttributes (writer As HtmlTextWriter)Parameters
- writer
- HtmlTextWriter
An HtmlTextWriter that receives the rendered output.
Examples
The following code example demonstrates how to override the RenderAttributes method in a custom server control so that specific title text is always displayed for the HtmlInputRadioButton.
<%@ Page Language="C#" AutoEventWireup="True" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Samples" Assembly="Samples.AspNet.CS" %>
<!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>Custom HtmlInputRadioButton - RenderAttributes - C# Example</title>
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
Div1.InnerHtml = "";
}
void HtmlInputRadioButtonGroup1_ServerChange(object sender, System.EventArgs e)
{
// Diplay the value of the selected HtmlInputRadioButton control.
System.Web.UI.HtmlControls.HtmlInputRadioButton htmlInputRadioButtonGroup1 = (System.Web.UI.HtmlControls.HtmlInputRadioButton) sender;
Div1.InnerHtml = "You change your selection to: " + htmlInputRadioButtonGroup1.Value;
}
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlInputRadioButton - Method - C# RenderAttributes</h3>
<aspSample:CustomHtmlInputRadioButtonRenderAttributes
id="HtmlInputRadioButton1"
name="HtmlInputRadioButtonGroup1"
runat="server"
type="radio" checked
onserverchange="HtmlInputRadioButtonGroup1_ServerChange"
value="HtmlInputRadioButton1">HtmlInputRadioButton1
</aspSample:CustomHtmlInputRadioButtonRenderAttributes>
<br />
<aspSample:CustomHtmlInputRadioButtonRenderAttributes
id="HtmlInputRadioButton2"
name="HtmlInputRadioButtonGroup1"
runat="server"
type="radio"
onserverchange="HtmlInputRadioButtonGroup1_ServerChange"
value="HtmlInputRadioButton2">HtmlInputRadioButton2
</aspSample:CustomHtmlInputRadioButtonRenderAttributes><br />
<p>
<input type="submit" value="Submit" id="Submit1" name="Submit1" runat="server" />
</p>
<div
id="Div1"
runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
</form>
</body>
</html>
<%@ Page Language="VB" AutoEventWireup="True" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.VB.Samples" Assembly="Samples.AspNet.VB" %>
<!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>Custom HtmlInputRadioButton - RenderAttributes - Visual Basic Example</title>
<script runat="server">
Sub Page_Load(sender As Object, e As EventArgs)
Div1.InnerHtml = ""
End Sub
Sub HtmlInputRadioButtonGroup1_ServerChange(sender As Object, e As System.EventArgs)
Dim htmlInputRadioButtonGroup1 As System.Web.UI.HtmlControls.HtmlInputRadioButton = CType(sender, System.Web.UI.HtmlControls.HtmlInputRadioButton)
Div1.InnerHtml = "You change your selection to: " & htmlInputRadioButtonGroup1.Value
End Sub
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlInputRadioButton - Method - Visual Basic RenderAttributes</h3>
<aspSample:CustomHtmlInputRadioButtonRenderAttributes
id="HtmlInputRadioButton1"
name="HtmlInputRadioButtonGroup1"
runat="server"
type="radio" checked
onserverchange="HtmlInputRadioButtonGroup1_ServerChange"
value="HtmlInputRadioButton1">HtmlInputRadioButton1
</aspSample:CustomHtmlInputRadioButtonRenderAttributes>
<br />
<aspSample:CustomHtmlInputRadioButtonRenderAttributes
id="HtmlInputRadioButton2"
name="HtmlInputRadioButtonGroup1"
runat="server"
type="radio"
onserverchange="HtmlInputRadioButtonGroup1_ServerChange"
value="HtmlInputRadioButton2">HtmlInputRadioButton2
</aspSample:CustomHtmlInputRadioButtonRenderAttributes><br />
<p>
<input type="submit" value="Submit" id="Submit1" name="Submit1" runat="server" />
</p>
<div
id="Div1"
runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
</form>
</body>
</html>
using System.Web;
using System.Security.Permissions;
namespace Samples.AspNet.CS.Samples
{
[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
public sealed class CustomHtmlInputRadioButtonRenderAttributes : System.Web.UI.HtmlControls.HtmlInputRadioButton
{
protected override void RenderAttributes(System.Web.UI.HtmlTextWriter writer)
{
// Call the base class's RenderAttributes method.
base.RenderAttributes(writer);
// Write out the control's Title tag.
writer.Write(" Title=\"Option " + this.Value + "\"");
}
}
}
Imports System.Web
Imports System.Security.Permissions
Namespace Samples.AspNet.VB.Samples
<AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _
Public NotInheritable Class CustomHtmlInputRadioButtonRenderAttributes
Inherits System.Web.UI.HtmlControls.HtmlInputRadioButton
Protected Overrides Sub RenderAttributes(ByVal writer As System.Web.UI.HtmlTextWriter)
' Call the base class's RenderAttributes method.
MyBase.RenderAttributes(writer)
' Write out the control's Title tag.
writer.Write((" Title=""Option " + Me.Value + """"))
End Sub
End Class
End Namespace
Remarks
The RenderAttributes method writes the Value property as an attribute of the HtmlInputRadioButton control and then calls the base class's RenderAttributes method
The RenderAttributes method is used primarily by control developers extending the functionality of the HtmlInputRadioButton control.
