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Major Grid Bugs: Virtual Scroll, Paging, Sorting & All Records Disappearing

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Cary Abramoff
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Cary Abramoff asked on 05 Nov 2011, 01:36 AM
Hi,

The following link is live and can be used to reliably reproduce a multitude of severe bugs with the kendo ui grid.

http://fuhshnizzle.s3.amazonaws.com/shniZZKrafty.html?kraftyman=00000100002145560985

This prototype has all the source code by "view source" so that hopefully these bugs can be addressed.

We are storing all data in an array as per your documentation and initially everything seems fine until hard testing reveals the bugs below.

My startup loves the grid but the bugs are a deal breaker. We are using Grid beta 1 however looking at the bug fixes for v.1 shows none of these addressed. We have spent countless hours getting this to work so we do not want to upgrade until we can see that the Kendo team can reproduce and give guidance. We are hoping that we can go live with kendo grid and be one of your high profile users.

We are in development so we have apx. 4 weeks to either get the Kendo Grid functional or cut it from our architecture so we are willing to work with your team as required as hopefully it is a win/win for all concerned.

So here are the 2 but very serious bugs:

1. Virtual scroll never highlights the last page. It only highlights the next to the last page even though it is on the last record.

2. Sorting, Elevator Bar and Page # do not sync. In other words when you sort to change the order the paging can show the scrollbar at the top but the highlighted page # in the footer as the last page. I am not sure if this is by design but it confuses our testers. They would expect the page to be at #1 when scroll bar is at the top.

MAJOR AND WORST BUG.
3. after scrolling, simply clicking on the column header for SORT OR a PAGE NUMBER in footer will collapse the grid as if there were zero records to display. This is quite severe and 100% reproducible. Just scroll down by clicking and dragging the elevator bar then click the column header. See attachment. PS- clicking the blue logo will reload the grid to expedite your testing.

4. IE8 rendering bug: The grid is completely mis-rendered in IE8 see IE8 snapshot attachment.

Please pound on this prototype by trying various combinations of scroll/page#/sort, i.e. using sort, paging, and virtual scrolling ALWAYS suss out the bugs/quirks and please guide us to include your very promising control in our web app. Again we have spent over 300 manhours getting your grid to work it would be a shame to have to use another company's grid.

Best,

Cary












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Cary Abramoff
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answered on 06 Nov 2011, 08:49 AM
Hi,

I've done alot more testing and there is no doubt the virtual scrolling feature is buggy.
I believe what it does is "lump" all the records on page 1 regardless of page size so that after scrolling or sorting (probably same bug) clicking subsequent page buttons in the footer collapses the grid so that the k-contents section has a height of 0px.

I have removed virtual scrolling and now the grid is behaving properly.

Cary
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Rosen
Telerik team
answered on 07 Nov 2011, 12:59 PM
Hi Cary Abramoff,

The behavior you have described is caused by the fact that currently having both paging and virtual scrolling enabled is not  supported. Note that the virtual scrollbar position will not be synchronized while paging, which will cause similar to the described behavior.

Also I have noticed that you have set quite a small page size (5 records per page) for virtual scrolling to work as designed. In order to take full advantage of virtual scrolling feature, page size should be set higher, for example 30+ records per page.

Regards,
Rosen
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Cary Abramoff
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answered on 07 Nov 2011, 10:30 PM
Thanks very much Rosen. I understand completely.
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Cary Abramoff
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Cary Abramoff
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Rosen
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