HtmlInputCheckBox.OnPreRender Method

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)

protected public:
virtual void OnPreRender (
	EventArgs^ e
) override
protected void OnPreRender (
	EventArgs e
)
protected internal override function OnPreRender (
	e : EventArgs
)

Parameters

e

An EventArgs that contains event data.

The OnPreRender method overrides the base OnPreRender method. OnPreRender is used primarily by control developers.

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.

No code example is currently available or this language may not be supported.
<%@ 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>

No code example is currently available or this language may not be supported.
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.

.NET Framework

Supported in: 2.0, 1.1, 1.0

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