HtmlInputRadioButton.OnPreRender Method
.NET Framework 3.0
Raises the PreRender event and registers the HtmlInputRadioButton control as one that requires postback handling.
Namespace: System.Web.UI.HtmlControls
Assembly: System.Web (in system.web.dll)
Assembly: System.Web (in system.web.dll)
The following code example demonstrates how to override the OnPreRender method so that it adds a Title attribute in a custom HtmlInputRadioButton server control.
<%@ Page Language="VJ#" AutoEventWireup="True" %>
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<!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 - OnPreRender - VJ# Example</title>
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
Div1.set_InnerHtml("");
} //Page_Load
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.set_InnerHtml("You change your selection to: "
+ htmlInputRadioButtonGroup1.get_Value());
} //HtmlInputRadioButtonGroup1_ServerChange
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlInputRadioButton - OnPreRender - VJ# Example</h3>
<aspSample:CustomHtmlInputRadioButtonOnPreRender
id="HtmlInputRadioButton1"
name="HtmlInputRadioButtonGroup1"
runat="server"
type="radio" checked
onserverchange="HtmlInputRadioButtonGroup1_ServerChange"
value="HtmlInputRadioButton1">HtmlInputRadioButton1
</aspSample:CustomHtmlInputRadioButtonOnPreRender>
<br />
<aspSample:CustomHtmlInputRadioButtonOnPreRender
id="HtmlInputRadioButton2"
name="HtmlInputRadioButtonGroup1"
runat="server"
type="radio"
onserverchange="HtmlInputRadioButtonGroup1_ServerChange"
value="HtmlInputRadioButton2">HtmlInputRadioButton2
</aspSample:CustomHtmlInputRadioButtonOnPreRender>
<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>
package Samples.AspNet.JSL.Controls;
public class CustomHtmlInputRadioButtonOnPreRender
extends System.Web.UI.HtmlControls.HtmlInputRadioButton
{
protected void OnPreRender(System.EventArgs e)
{
// Run the OnPreRender method on the base class.
super.OnPreRender(e);
// Add a Title attribute.
this.get_Attributes().Add("title", "Option " + this.get_Value());
} //OnPreRender
} //CustomHtmlInputRadioButtonOnPreRender
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