RadJumpList and ExpanderControl not scrolling when last item expanded

[Derik]

I have a RadJumpList which has 'N' items in the list.  Each Item has an ExpanderControl.  When the very last item is expanded I would expect the list to scroll up but it does not.  

I have read the post here 'ExpanderControl Inside ScrollViewer Control' (http://www.telerik.com/community/forums/windows-phone-8/expandercontrol/expandercontrol-inside-scrollviewer-control.aspx) but i am not inside a scrollviewer and the solution did not work for me.

Is there anything I can do here?

Thanks in advance for your help.

Derik

[Deyan]

Hi Derik,



Thanks for writing.



Based on the description you are giving we cannot exactly determine the reason for the behavior you are experiencing.

Is it possible for you to send us a project which we can use to reproduce the behavior and see how we can further assist you?



You will have to open a new support ticket in order to be able to do this.



Regards,

Deyan
Telerik

[Gaurav]

Hi,
I am facing the same problem while using DataBoundListBox with the ExpanderControl.

The problem:
Consider this ListBox with list of items (over here trains) stated in illustration 1 picture.
Normally, when we tap on an item to expand it, the expander control expands downwards which pushes other list items below. This is the expected behavior observed.

Now, when we tap on the last item in the listbox to expand it, as usual the item is expanded downwards. Due to this, the expanded content panel is moved out of view and if we do not have any animated indicator which shows the content's expansion state, user will not be able to see this at first. Of course, you can scroll down to have a look at the expanded content but that is not great in UX point of view.

What should happen is illustrated in Illustration 3. If content would have expanded upwards, all the list items above would have been pushed upwards keeping the expanded content in the current view. But a change like this would create problem for first item in the list.

PS when we scroll extreme down after expanding the list item to see the content, after that if we close the expander control and open yet again we see a behavior as illustrated in illustration 3. Is there any workaround to get default behaviour like illustrated in illustration 3?

[Deyan]

Hi Gaurav,

Thanks for writing and for the attached screenshots.

This behavior seems to be related to the native ScrollViewer component which we are internally using in RadDataBoundListBox. It appears that the ScrollViewer does not apply an initial scroll offset to reflect the size change of the element which has been expanded. 

We will perform some additional investigations and if we encounter something that we could do on our side to address this - we will include it in an Internal Build for you.

Let us know should you have additional questions.

Regards,
Deyan
Telerik

[Derik]

Could i please be included in this build as well?

[Deyan]

Hello Derik,

It will be available for everyone via the Telerik Website.
If you have a valid Telerik License you will be able to download it from your account.

Regards,
Deyan
Telerik

[Gaurav]

Hi,

Thanks for the reply. I will be looking forward for the update. :)

Regards,
Gaurav Chouhan