HtmlInputText.OnPreRender Method (EventArgs)
.NET Framework (current version)
Raises the PreRender event.
Assembly: System.Web (in System.Web.dll)
The OnPreRender method is called just prior to rendering the HtmlInputText control. The OnPreRender method is used primarily by control developers extending the functionality of the HtmlInputText control.
The following code example demonstrates how to override the OnPreRender method so that it sets the MaxLength property to 30 characters in a custom HtmlInputText server control.
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.CS.Controls" Assembly="Samples.AspNet.CS" %> <%@ Page Language="C#" AutoEventWireup="True" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <script runat="server"> void Page_Load(Object sender, EventArgs e) { if (!Page.IsPostBack) { HtmlInputText1.Value = "Hello HtmlInputText World."; } } void HtmlInputText1_ServerChange(object sender, System.EventArgs e) { // Diplay the value of the selected HtmlInputText control. System.Web.UI.HtmlControls.HtmlInputText htmlInputText1 = (System.Web.UI.HtmlControls.HtmlInputText) sender; Div1.InnerHtml = "Change the preceding text to:<br />" + htmlInputText1.Value; } </script> <html xmlns="http://www.w3.org/1999/xhtml" > <head> <title>Custom HtmlInputText OnPreRender Example</title> </head> <body> <form id="Form1" method="post" runat="server"> <h3>Custom HtmlInputText OnPreRender Example</h3> <p>Make a change to the text, and then press the ENTER.<br /> <aspSample:CustomHtmlInputTextOnPreRender id="HtmlInputText1" name="HtmlInputText1" runat="server" type="text" size="45" style="WIDTH: 305px; HEIGHT: 22px" onserverchange="HtmlInputText1_ServerChange"> </p> <br /> <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.Controls { [AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)] public sealed class CustomHtmlInputTextOnPreRender : System.Web.UI.HtmlControls.HtmlInputText { protected override void OnPreRender(System.EventArgs e) { // Call the base class's OnPreRender method. base.OnPreRender(e); // Set the HtmlInputText object's MaxLength property to 30 characters. this.MaxLength = 30; } } }
.NET Framework
Available since 1.1
Available since 1.1
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