HtmlButton.OnPreRender Method
.NET Framework 3.0
Raises the PreRender event and registers client script for generating a postback.
Namespace: System.Web.UI.HtmlControls
Assembly: System.Web (in system.web.dll)
Assembly: System.Web (in system.web.dll)
The OnPreRender method is used primarily by control developers extending the functionality of the HtmlButton control.
The following code example demonstrates how to override the OnPreRender method in a custom server control so that it always displays the HtmlButton with bold text.
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" 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>Custom HtmlButton - OnPreRender - VJ# Example</title>
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
HtmlButton1.get_Attributes().Add("onclick",
"alert('Hello client-side world.');");
} //Page_Load
void HtmlButton1_ServerClick(Object sender, EventArgs e)
{
Div1.set_InnerHtml("Hello server-side world.");
} //HtmlButton1_ServerClick
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlButton - OnPreRender - VJ# Example</h3>
<aspSample:CustomHtmlButtonOnPreRender
id="HtmlButton1"
runat="server"
type="button"
onserverclick="HtmlButton1_ServerClick"
name="HtmlButton1">Html Button</aspSample:CustomHtmlButtonOnPreRender>
<div id="Div1" runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" />
</form>
</body>
</html>
package Samples.AspNet.JSL.Controls;
public class CustomHtmlButtonOnPreRender
extends System.Web.UI.HtmlControls.HtmlButton
{
protected void OnPreRender(System.EventArgs e)
{
// Call the base OnPreRender method.
super.OnPreRender(e);
// Always display the HtmlButton with bold text.
this.get_Style().Add("font-weight", "bold");
} //OnPreRender
} //CustomHtmlButtonOnPreRender
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