Setting the TabPanel
's OnDemandMode
to OnDemandMode.None
forces the addition of the controls right away, which makes them display.
Adding aTabPanel dynamically and making its ContentTemplate from ASPX
-
27-06-2022 - |
Question
Context:
An AJAX Control Toolkit TabContainer
, where each TabPanel
is generated with code behind, and its ContentTemplate is a custom control.
The custom control corresponds to what goes directly in the TabPanel
's ContentTemplate
:
<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="TabContentTemplateTest.ascx.cs" Inherits="WebGUI.Controls.TabContentTemplateTest" %>
<asp:Label runat="server" ID="TabText" />
And code behind:
public partial class TabContentTemplateTest : UserControl, ITemplate
{
public string Number { get; set; }
protected void Page_Load(object sender, EventArgs e)
{
TabText.Text = Number;
}
public void InstantiateIn(Control container)
{
container.Controls.Add(this);
}
}
Creation (code behind of TabContainerTest
, having a TabContainer
named SamplesTabContainer
):
public string[] Numbers = { "zero", "one", "two", "three", "four" };
protected void Page_Load(object sender, EventArgs e)
{
for (int i = 0; i < 5; i++)
{
var tabContent = LoadControl("~/Controls/TabContentTemplateTest.ascx") as TabContentTemplateTest;
tabContent.Number = Numbers[i];
SamplesTabContainer.Tabs.Add(new TabPanel
{
HeaderText = i.ToString(),
ContentTemplate = tabContent
});
}
}
The problem is that the content (here simplified to a label) doesn't show.
How can I generate the custom control from ASPX as a ContentTemplate
and display it?
Solution
OTHER TIPS
If you're using the asp:ScriptManager
control, try using the ajaxToolkit:ToolkitScriptManager
control instead.
I put together a test project and when using the asp:ScriptManager
the TabPanel
wouldn't display, though they were in the source html. I was also getting a javascript error, 'Sys.Extended is undefined', which led to numerous web search results spanning multiple versions of the ajax toolkit. A common suggestion was to switch script managers. Doing so fixed the visibility of the TabPanel
and eliminated the javascript error as well.
Specifics of test project:
VS2010
ASP.Net web app using .Net 4
IIS Express
Installed AjaxControlToolkit version 4.1.7.725 using Nuget
TabContentTemplateTest.ascx identical to code and markup in original question
Default.aspx codebehind identical to code in original question
Default.aspx markup as follows
<%@ Page Title="Home Page" Language="C#" MasterPageFile="~/Site.master" AutoEventWireup="true"
CodeBehind="Default.aspx.cs" Inherits="WebGUI.Default" %>
<asp:Content ID="HeaderContent" runat="server" ContentPlaceHolderID="HeadContent">
</asp:Content>
<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent">
<ajaxToolkit:ToolkitScriptManager runat="server" ID="ajaxScriptManager" />
<ajaxToolkit:TabContainer runat="server" ActiveTabIndex="0"
ID="SamplesTabContainer">
</ajaxToolkit:TabContainer>
</asp:Content>
I just see two issue with the code you shared:
- I didn't see you calling InstantiateIn() function after adding the tab.
- I would suggest using InstantiateIn(ref Control container)
Hope this helps.