HtmlInputCheckBox.OnPreRender Method
.NET Framework 3.0
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" %>
<!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 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>
<br />
Enter Interests:<p>
<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>
<br />
<div id="Div1" runat="server"
style="DISPLAY: inline; WIDTH: 256px; HEIGHT: 15px"
ms_positioning="FlowLayout" />
</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
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