WebTimer cannot be cast to WebUIControl

Targets Web
1

I just came across an issue where my code throws an exception when looping through the controls on a web page. The page includes a timer control and that seems to be causing the problem.

I loop through the controls like this:

For Each cntrl As WebUIControl In Self.Controls
   System.DebugLog(cntrl.Name)
Next

When the code reaches the timer control it halts on the “Next” statement and I get an “IllegalCastException” with this as the reason “WebTimer cannot be cast to WebUIControl”.

I am seeing the names of the controls on my web page until it fails with the exception.

So you can’t iterate through the control collection on any page that includes a timer? That complicates things.

Can anyone tell me how to work around this issue?

-Wes

PS. I’m running Xojo Version 2021 Release 1.1 if that matters.

2

That’s right. WebTimer is a WebControl. You’ll need to change your loop to use WebControl and then check each control for IsA WebUIControl and cast it before accessing WebUiControl properties.

For Each cntrl As WebControl In Self.Controls
   System.DebugLog(cntrl.Name)
Next
1 Like
3

Thanks @Greg_O

That did the trick.

I’m just getting started with the Xojo Web2.0 stuff and I missed the “WebControl” and assumed that “WebUIControl” was what I was looking for.

Thanks again.
-Wes

4

@Wes_Westhaver then I urge you to update to last xojo because web 2.0 in the earlier version you’re using is really … well… you know … not complete… !

5

Well, I’ll upgrade when I have the cash but for now I’ve got to work with the Xojo I have (warts and all.)
-Wes