HtmlSelect.AddParsedSubObject Method
.NET Framework 2.0
Adds a parsed child control to the HtmlSelect control.
Namespace: System.Web.UI.HtmlControls
Assembly: System.Web (in system.web.dll)
Assembly: System.Web (in system.web.dll)
| Exception type | Condition |
|---|---|
| The child control specified by the obj parameter must be of the type ListItem. |
The following code example demonstrates how to override the AddParsedSubObject method in a custom server control so that it always checks that an instance of the ListItem class is added to the HtmlSelect selected items collection.
<%@ Register TagPrefix="aspSample" Namespace="Samples.AspNet.JSL.Controls" Assembly="Samples.AspNet.JSL" %>
<%@ Page Language="VJ#" AutoEventWireup="True" %>
<HTML>
<HEAD>
<title>Custom HtmlSelect - AddParsedSubObject - VJ# Example</title>
<script runat="server">
void HtmlInputButton1_ServerClick(Object sender, EventArgs e)
{
if (HtmlSelect1.get_SelectedIndex() >= 0) {
if (HtmlSelect1.get_Multiple() == true) {
Div1.set_InnerHtml("You selected:");
for (int i=0; i<=HtmlSelect1.get_Items().get_Count() - 1; i++) {
if (HtmlSelect1.get_Items().get_Item(i).
get_Selected() == true) {
Div1.set_InnerHtml(Div1.get_InnerHtml()
+ "<br> "
+ HtmlSelect1.get_Items().get_Item(i).get_Value());
}
}
}
else {
Div1.set_InnerHtml("You selected " + HtmlSelect1.get_Value());
}
}
else {
Div1.set_InnerHtml("You did not select an item.");
}
} //HtmlInputButton1_ServerClick
</script>
</HEAD>
<body>
<form id="Form1" method="post" runat="server">
<h3>Custom HtmlSelect - AddParsedSubObject - VJ# Example</h3>
<p>
<aspSample:CustomHtmlSelectAddParsedSubObject
id="HtmlSelect1"
name="HtmlSelect1"
runat="server">
<OPTION value="Option1">Option1</OPTION>
<OPTION value="Option2">Option2</OPTION>
<OPTION value="Option3">Option3</OPTION>
</aspSample:CustomHtmlSelectAddParsedSubObject>
</p>
<p>
<INPUT
id="HtmlInputButton1"
runat="server"
type="button"
onserverclick="HtmlInputButton1_ServerClick"
value="Select"
name="HtmlInputButton1">
</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 CustomHtmlSelectAddParsedSubObject
extends System.Web.UI.HtmlControls.HtmlSelect
{
protected void AddParsedSubObject(Object obj)
throws System.Web.HttpException
{
// If the object is a ListItem, then add the ListItem to
//the Items collection.
if (obj instanceof System.Web.UI.WebControls.ListItem) {
get_Items().Add((System.Web.UI.WebControls.ListItem)obj);
}
else {
throw new System.Web.
HttpException("You cannot have a child control of type "
+ obj.GetType().get_Name().ToString());
}
} //AddParsedSubObject
} //CustomHtmlSelectAddParsedSubObject
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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