HtmlInputCheckBox.OnPreRender Method
.NET Framework 2.0
Raises the OnPreRender event and registers the 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 in a custom server control so that a Title attribute is added to each HtmlInputCheckBox control.
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" AutoEventWireup="True" %>
<HTML>
<HEAD>
<title>Custom HtmlInputCheckBox - OnPreRender - C# Example</title>
<script runat=server>
void Button1_Click(Object sender, EventArgs e)
{
Div1.set_InnerHtml("");
if(HtmlInputCheckBox1.get_Checked() == true) {
Div1.set_InnerHtml("You like basketball. ");
}
if(HtmlInputCheckBox2.get_Checked() == true) {
Div1.set_InnerHtml(Div1.get_InnerHtml() + "You like football. ");
}
if(HtmlInputCheckBox3.get_Checked() == true) {
Div1.set_InnerHtml(Div1.get_InnerHtml() + "You like soccer. ");
}
} //Button1_Click
</script>
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlInputCheckBox - OnPreRender - VJ# Example</h3>
<P>
Enter Interests:<br>
<aspSample:CustomHtmlInputCheckBoxOnPreRender
id="HtmlInputCheckBox1"
runat="server"
type="checkbox" checked
value="Basketball"> Basketball
<aspSample:CustomHtmlInputCheckBoxOnPreRender
id="HtmlInputCheckBox2"
runat="server"
type="checkbox"
value="Football"> Football
<aspSample:CustomHtmlInputCheckBoxOnPreRender
id="HtmlInputCheckBox3"
runat="server"
type="checkbox"
value="Soccer"> Soccer
</P>
<P>
<input id="Button1"
runat="server"
type="button"
value="Enter"
OnServerClick="Button1_Click"
name="Button1">
</P>
<P>
<DIV id="Div1" runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px"
ms_positioning="FlowLayout" />
</P>
</form>
</body>
</HTML>
package Samples.AspNet.JSL.Controls;
public class CustomHtmlInputCheckBoxOnPreRender
extends System.Web.UI.HtmlControls.HtmlInputCheckBox
{
protected void OnPreRender(System.EventArgs e)
{
// Call the base class's OnPreRender method.
super.OnPreRender(e);
// Add a Title attribute to each HtmlInputCheckBox.
this.get_Attributes().Add("title", "If you like "
+ this.get_Value() + ", then select this check box.");
} //OnPreRender
} //CustomHtmlInputCheckBoxOnPreRender
Windows 98, Windows 2000 SP4, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.
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