RadComboBox - IE freezes when RCB is clicked

[Robert Helm]

First, I will say, I do have a work around for this as gathered from previous threads
here: http://www.telerik.com/community/forums/aspnet-ajax/combobox/radcombobox-scrolling-selection-locks-browser.aspx 
and here: http://www.telerik.com/community/forums/aspnet-ajax/combobox/radcombobox-ie-7-freeze-problem.aspx 

But I wanted to post again because this didn't happen for us until we upgraded to the 2010 Q2 release so this is still an issue.

Description:
I have multiple RadComboBoxes (RCB) in a RadWindow that pops up, and all the RCB have mostly the same property settings.
When I click one of the RCB, it opens and the whole browser freezes as the CPU is maxed.
If the RCB in question has fewer items in it (so that it doesn't extend passed the RadWindow boundries) there's no problem. This is odd because the first few RCB are fine, including one that has enough items to extend passed the RadWindow boundries.

Solutions (from the links above):
Either  set the RCB property EnableScreenBoundaryDetection="false" or set the RCB property MaxHeight to some number that will keep the list from extending past the RadWindow boundry.


Just wondering if there is some kind of fix coming to avoid doing these workarounds whenever they crop up.

Robert Helm

[Simon]

Hi Robert Helm,

It is not good that this bug has come back into existence. Perhaps it is another case which we have missed to cover.

Can you open a support ticket and send us a project showing the issue there? We will immediately investigate it and will provide you with a workaround.

Best wishes,
Simon
the Telerik team

[Robert Helm]

Thanks Simon,

If I can, I will submit a support ticket with an attached example project.

However, for now I already have a workaround, just set EnableScreenBoundaryDetection="false" or set MaxHeight to some appropriate number.

I'd like to add that the popup RadWindow that contains the RadComboBoxes has AutoSize="true" so it seems like the RadWindow is might be trying to resize while the RCB is trying to detect the screen boundary of the RadWindow.

Thanks.

[Simon]

Hi Robert Helm,

Actually this is be possible. We will definitely have it in mind when we debug the issue.

Thank you for the tip.

Regards,
Simon
the Telerik team

[Jon Badgett]

We're seeing this behavior too. Our situation:
* Window is a chromeless window opened using javascript window.open
* RadComboBoxes are populated via web service after 3 characters are entered
* Browser (IE8, Windows XP) locks up after data is retrieved from web service (but only when more than a few results are returned). This may be the point where it would need to draw the dropdown larger than the window can contain.

The above mentioned workaround works in this case as well. We are on 2010 Q2, but haven't moved to SP1 yet.

[Simon]

Hi Jon Badgett,

It has been a long time since Robert wrote about the issue, however since then we have not received a sample project.

Could you please open a support ticket and send us such a project there?

Kind regards,
Simon
the Telerik team

[Daniel]

Hi. I'd just like to add that I too have come accross this bug. It happens to me in XP SP3 with IE7 and Win7 with IE8. For me, setting the EnableScreenBoundaryDetection="false" seemed to fix the problem for me. I have only seen this problem with a large list (about 1000 items) in the radcombobox inside a radwindow. I'm using version 2010.2.713.35. Hope this helps. Thanks.

Daniel

[Nate]

I've had this happen before.  However, my radcombobox is not inside a window, just on a page.  Freezes IE and everything.
Happens intermittently on some people's computers.  Hopefully the suggestions above will fix it

[Simon]

Hi Nate,

Please open a support ticket and send us sample showing the issue.

Once we reproduce it on our side, we will fix it.

Kind regards,
Simon
the Telerik team

[Tom]

This issue exists after I upgraded to the latest version.  radcombobox locks ie11.  None of the remedies suggested here work, i.e., maxHeight="200px" or EnableScreenBoundaryDetection="false".

[Ivan Danchev]

Hello bigred,

Could you please post a sample page demonstrating the problematic behavior? It will give us a better idea of your scenario and the ComboBox configuration.Our guidelines could help you isolate the issue.

Regards,
Ivan Danchev
Telerik

[Tom]

Ivan, please see http://www.telerik.com/forums/radcombobox-scrolling-selection-locks-browser#BNtQvYozXkefaqg4VSMJ_A

Andrew sent a sample project and Telerik was unable to reproduce the issue on their side.  Since Telerik can't reproduce, why don't you send me Andrews sample project and I'll run it in my environment.

[Tom]

Ivan,

Also see below.  More sample code for you:

http://www.telerik.com/forums/radcombobox-ie-7-freeze-problem

http://www.telerik.com/forums/ajax-only-works-once-w-radcombobox-then-freezes-box

http://www.telerik.com/forums/radcombobox-scrolling-selection-locks-browser#BNtQvYozXkefaqg4VSMJ_A

[Ivan Danchev]

Hello bigred,

I replied to the ticket submitted with the same subject in the ticketing system. In order to avoid thread duplication I suggest we continue the discussion there.

Regards,
Ivan Danchev
Telerik

[Andrea]

I had the same issue, and I have resolved only to set RenderMode="Lightweight" in the RadComboBox.

cheers
--
Andrea Dottor

[Tom]

Thanks, I already fixed the issue by removing the meta tags that were forcing the page to run in IE8 compatibility mode.