HtmlButton.OnPreRender Method (EventArgs)
.NET Framework (current version)
Raises the PreRender event and registers client script for generating a postback.
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.VB.Controls" Assembly="Samples.AspNet.VB" %> <%@ 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>Custom HtmlButton - OnPreRender - Visual Basic Example</title> <script runat="server"> Sub Page_Load(sender As Object, e As EventArgs) HtmlButton1.Attributes.Add("onclick", "alert('Hello client-side world.');") End Sub Sub HtmlButton1_ServerClick(sender As Object, e As EventArgs) Div1.InnerHtml = "Hello server-side world." End Sub </script> </head> <body> <form id="Form1" method="post" runat="server"> <h3>Custom HtmlButton - OnPreRender - Visual Basic Example</h3> <aspSample:CustomHtmlButtonOnPreRender id="HtmlButton1" runat="server" type="button" onserverclick="HtmlButton1_ServerClick" name="HtmlButton1">Button</aspSample:CustomHtmlButtonOnPreRender> <div id="Div1" runat="server" style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px" /> </form> </body> </html>
Imports System.Web Imports System.Security.Permissions Namespace Samples.AspNet.VB.Controls <AspNetHostingPermission(SecurityAction.Demand, Level:=AspNetHostingPermissionLevel.Minimal)> _ Public NotInheritable Class CustomHtmlButtonOnPreRender Inherits System.Web.UI.HtmlControls.HtmlButton Protected Overrides Sub OnPreRender(ByVal e As System.EventArgs) ' Call the base class's OnPreRender method. MyBase.OnPreRender(e) ' Always display the HtmlButton with bold text. Me.Style.Add("font-weight", "bold") End Sub End Class End Namespace
.NET Framework
Available since 1.1
Available since 1.1
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