HtmlTextArea.OnPreRender Method
.NET Framework 3.0
Raises the PreRender event.
Namespace: System.Web.UI.HtmlControls
Assembly: System.Web (in system.web.dll)
Assembly: System.Web (in system.web.dll)
The OnPreRender method notifies the HtmlTextArea control to perform any necessary steps prior to saving the view state and rendering content.
The OnPreRender method is used primarily by control developers extending the functionality of the HtmlTextArea control.
Notes to Inheritors: When overriding the OnPreRender method in a derived class, be sure to call the base class's OnPreRender method so that the HtmlTextArea control is properly registered with the page.The following code example demonstrates how to override the OnPreRender method to always display 5 rows and 75 columns in a custom HtmlTextArea server 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 HtmlTextArea - OnPreRender - VJ# Example</title>
<script runat="server">
void Page_Load(Object sender, EventArgs e)
{
HtmlTextArea1.set_Value("Hello Html Text Area World.");
} //Page_Load
</script>
</head>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlTextArea - OnPreRender - VJ# Example</h3>
<aspSample:CustomHtmlTextAreaOnPreRender
id="HtmlTextArea1"
name="HtmlTextArea1"
runat="server"
rows="4"
cols="50" />
</form>
</body>
</html>
package Samples.AspNet.JSL.Controls;
public class CustomHtmlTextAreaOnPreRender
extends System.Web.UI.HtmlControls.HtmlTextArea
{
protected void OnPreRender(System.EventArgs e)
{
// Call the base's OnPreRender method.
super.OnPreRender(e);
// Always display this control with 5 rows and 75 columns
this.set_Rows(5);
this.set_Cols(75);
} //OnPreRender
} //CustomHtmlTextAreaOnPreRender
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