Dynamically adding Controls to WebUserControl

[bright]

Hello,
I created a Web User Control (called 'CTL_Worklist'), in which I statically add an ext:Panel.
No I try to add a LinkButton to the content of that ext:Panel.
I call Panel.UpdateContent() and the LinkButton is corrctly displayed in the Panel.
I also added a DirectEvent with a Url to another aspx site to the LinkButton.
So far so good.

But now I try to click on that LinkButton (called 'Btn1') and I get the following strange Error:
'The control with ID 'CTL_Worklist_Btn1' not found'

The stacktrace is:

[HttpException (0x80004005): The control with ID 'CTL_Worklist_Btn1' not found]
   Ext.Net.ResourceManager.RaisePostBackEvent(String eventArgument) +2102
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +13
   System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +176
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5563

Am I missing something or what am I doing wrong here?
Thanks a lot for your help!
regards,
bright

[geoffrey.mcgill]

Hi,

You are dynamically adding a Control on one request, but that Control is not automatically available in future requests, unless re-added to the Controls Collection of the Page.

[bright]

Hi,
thanks for the very quick response!
But how do I add a control to the controls collection of a Page? Because when I do
Page.Controls.Add(linkButton)
it disappears from the Panel :(

What I do exactly is:

LOGGER.Debug("Adding Worklist Entries");

			Ext.Net.LinkButton linkButton = new Ext.Net.LinkButton();
			linkButton.Text = "Lieferschein 0815 zu Bearbeiten";
			linkButton.ID = "Btn1";
			linkButton.DirectEvents.Click.Url = "~/Sites/Workflow/Lieferschein.aspx";

			WorklistPanel.ContentContainer.Controls.Add(linkButton);
			WorklistPanel.UpdateContent();

Thanks a lot!
regards,
Simon

[geoffrey.mcgill]

Hi,

Using this...

WorklistPanel.ContentContainer.Controls.Add(linkButton);

... actually does add the Control to the Pages .Controls Collection. It's handled under-the-covers for you.

[bright]

Ok, that is fine. But somehow I still get this error, that it cannot find the control which I added. I also looked in the ResourceManager string on the site's source, but the button I added is not contained in it.

Maybe it has something to do with the fact that I add this LinkButton during a DirectEvent Ajax call?
Thank you very much,
bright

[bright]

Hi,

I figured out a few more things:
It seems that if I add a Control through an Ajax Event in CodeBehind, it is not permanently added to the page. Which meens pressing reload of the browser makes it disappear again. Is there a possibility to not letting the browser forget the controls on reload?
Can I add the Control permanently to the page? Which means it will also be included in the ResourceManager and in the ViewState of the page?

Thank you very much,
bright

[darrenarbell]

Hi,

I figured out a few more things:
It seems that if I add a Control through an Ajax Event in CodeBehind, it is not permanently added to the page. Which meens pressing reload of the browser makes it disappear again. Is there a possibility to not letting the browser forget the controls on reload?
Can I add the Control permanently to the page? Which means it will also be included in the ResourceManager and in the ViewState of the page?

Thank you very much,
bright

Hello

I am facing the same issue. Conceptually adding/changing controls dynamically is key to my proposed solution. Any answer to this would allow me to progress.

Thanks in advance
Darren

[bright]

I got it to work for me.
What I do is when I add a control to the page dynamically, I place marker, identifiying the control, in the session. When the page_load is executed on the page I look for this marker and if it is found, I add the control again to the page.

Does this make it clear somehow?
bright

[darrenarbell]

I got it to work for me.
What I do is when I add a control to the page dynamically, I place marker, identifiying the control, in the session. When the page_load is executed on the page I look for this marker and if it is found, I add the control again to the page.

Does this make it clear somehow?
bright

Hi Bright

Thanks for the reply. After seeing your answer and then digging around a bit further I decided to re-assess my approach. By this I mean using razor as my view engine and avoid the aspx lifecycle thing that is going on. In saying that, I'm still struggling a little with razor and doing things on the client instead, but I think its the correct way forward.

Thanks again
Darren