HtmlTextArea.AddParsedSubObject Method
.NET Framework 3.0
This method supports the .NET Framework infrastructure and is not intended to be used directly from your code.
Notifies the HtmlTextArea control that an object was parsed and adds the object to the HtmlTextArea control's ControlCollection object.
Namespace: System.Web.UI.HtmlControlsAssembly: System.Web (in system.web.dll)
| Exception type | Condition |
|---|---|
| The object specified by the obj parameter can only be of the type LiteralControl or DataBoundLiteralControl. |
The AddParsedSubObject method adds an object to the HtmlTextArea control's ControlCollection if the object is of the type LiteralControl or DataBoundLiteralControl; otherwise, an HttpException is thrown.
The AddParsedSubObject method is primarily used by control developers extending the functionality of the HtmlTextArea control.
The following code example demonstrates how to override the AddParsedSubObject method in a custom HtmlTextArea server control so that it always determines whether the parsed object is of the type LiteralControl or DataBoundLiteralControl.
<%@ 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 - AddParsedSubObject - 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 - AddParsedSubObject - VJ# Example</h3>
<aspSample:CustomHtmlTextAreaAddParsedSubObject
id="HtmlTextArea1"
name="HtmlTextArea1"
runat="server"
rows="4"
cols="50" />
</form>
</body>
</html>
package Samples.AspNet.JSL.Controls;
public class CustomHtmlTextAreaAddParsedSubObject
extends System.Web.UI.HtmlControls.HtmlTextArea
{
protected void AddParsedSubObject(Object obj)
throws System.Web.HttpException
{
// If the object is a LiteralControl or a DataBoundLiteralControl
// control, then pass the object to the base's AddParsedSubObject method.
if (obj instanceof System.Web.UI.LiteralControl
|| obj instanceof System.Web.UI.DataBoundLiteralControl) {
super.AddParsedSubObject(obj);
}
else {
throw new System.Web.
HttpException("You cannot have a child control of type "
+ obj.GetType().get_Name().ToString());
}
} //AddParsedSubObject
} //CustomHtmlTextAreaAddParsedSubObject
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