Programmatic creation of the RadWindowManager (getting Microsoft JScript runtime error: 'null' is null or not an object)

[Vladimir Gosic]

 Hello,

I am creating the RadWindowManager in the Page.Init event handler on every PostBack using the following code:

Dim cmdWindowManager As RadWindowManager = New RadWindowManager

cmdWindowManager.ID = "CommandWindowManager"

Dim cmdWindow As RadWindow = New RadWindow

cmdWindow.ID = "CommandWindow"

cmdWindow.ReloadOnShow = True

cmdWindow.ShowContentDuringLoad = False

cmdWindow.Modal = True

cmdWindow.AutoSize = True

cmdWindow.Width = Unit.Pixel(450)

cmdWindow.Height = Unit.Pixel(150)

cmdWindowManager.Windows.Add(cmdWindow)

contentContainer.Controls.Add(cmdWindowManager)

where contentContainer is an AspPanel in my ContentPage, which means I am using MasterPage also. I must add the RadWindowManager programmatic because it is done in a BasePage class from which all other content pages inherit.

I have tried many combination of the JavaScript that would show me the RadWindow, but I never got to see it shown. Here are two approaches that I tried (I am passing the RadWindowManager.ClientId to the function that generates the bellow JavaScripts).
The JavaScript I am adding everytime to the contentContainer (also on Page.Init) is:

function ShowEditForm(formUrl, formTitle) {

var oWnd = window.radopen(formUrl, formTitle);

return false;

}

function ShowInsertForm(formUrl, formTitle) {

alert('test');

var oWnd = $find(ctl00_ContentPlaceHolderMain_CommandWindowManager).GetWindowByName('CommandWindow');

oWnd.SetUrl(formUrl);

oWnd.Show();  return false;

}

and the code that I am adding to the same contentContainer after the Grid.ItemCommand event is:

' configure Client Script for Command Items

Dim radCodeBlockAction As RadScriptBlock = New RadScriptBlock

Dim script As New LiteralControl("<script type=""text/javascript"" language=""javascript""> " & Environment.NewLine & _

String.Format(ACTION_FUNCTION_FORMAT, _

ActionFunction, _

ActionFormUrl, _

FormTitle) & Environment.NewLine & _

"</script>")

' the result of String.Format is "ShowInsert('edit.aspx','CommandWindow')"

radCodeBlockAction.Controls.Clear()

radCodeBlockAction.Controls.Add(script)

contentContainer.Controls.Add(radCodeBlockAction)

So the code gets executed but client script debugger stops at:

var oWnd = window.radopen(formUrl, formTitle);

or:
var oWnd = $find(ctl00_ContentPlaceHolderMain_CommandWindowManager).GetWindowByName('CommandWindow');


with the error: Microsoft JScript runtime error: 'null' is null or not an object.
Could you please give me a quick response.

Thank you in advance!

Regards,
Vladimir

[Georgi Tunev]

Hello Vladimir,

Try calling the script that opens the RadWindow at a later stage - for example you could use window.setTimeout(). I believe that the reason for the problem is that you are trying to execute radopen() before the RadWindow / RadWindowManager is fully rendered on the page. Such behavior is expected because ASP.NET AJAX controls (including our RadControls) are created in Sys.Application.Init() - you can verify that by examining the HTML dump of a page with ASP.NET AJAX controls in it.


Regards,
Georgi Tunev
the Telerik team

[Vladimir Gosic]

Hello Georgi,

Thank you for your answer. I managed to resolve the issue myself, but forgot to post the solution here. I concluded that the script was being called to early, so I used:

Sys.Application.add_load(function(){ShowInsertForm('edit.aspx','CommandWindow')})

and the RadWindow loads as expected.

I now have the issue that after the RadWindow is closed by using "GetRadWindow().close();" or using X on the window, and after that some control on the parent Page invokes PostBack I get a ViewState error stating that Control tree/count is invalid. I managed to temporarily bypass it by calling Response.Redirect to the Page itself on close, but I would like to use only Grid.Rebind(). Is this a common issue or should I post more details about the problem?

Regards,
Vladimir

[Georgi Tunev]

Hello Vladimir,

I don't think this issue is related to the RadWindow control - I believe you would get the same behavior if you call the JavaScript function (that you call in RadWindow's OnClientClose) directly.

I don't know what exactly you do on the server in the postback, but in general such error occurs if you try to modify some controls - I suggest to check the exact error message in Google for more information on the subject.
In any case, I would suggest to consider using Ajax instead of postbacks. For example, if you are using RadAjax, you could use ajaxRequest() for calling server-side functions from the client.

All the best,
Georgi Tunev
the Telerik team