Kendo-angular: Grid with virtual scrolling

[rusev]

There is some unexpected visual behavior when you scroll the Grid:

It looks like, whenever i scroll up or down, there's this weird refresh, in which i see for a sec the old detail item opened, replaced right after with the new items.

This "glitch" is observable for a second until the table is repainted. Maybe we can show loading panel or something while scrolling?

Plnkr - http://plnkr.co/edit/eXm5OKBwHpOLaXZPxVtE?p=preview
Original post - https://stackoverflow.com/questions/41359095/kendogrid-weird-scrolling-while-detail-item-is-open

//cc @yordanov

[meriturva]

Same behavior here...and to be honest it is really annoying.
What i would like to say is that i think a loading panel is not a solution. User would like just to scroll, not see loading panel.
What do you think to link _detail open/close property_ to an _item property from data model_ so developer could just control it? is it a solution?
i really don't know how kendo grid works internally.
So thanks.

[sigVince]

Loading panel would be great. Better plnkr (imo) here, I forked the plnkr from the official doc and added a timeout to simulate a slow webservice : http://plnkr.co/edit/KXRFimr9oSLwCLng7K3i?p=preview

[meriturva]

I repeat: a loading panel is not a solution. Fix that issue introducing a new graphical element is not correct. We have all data already available. We just need a callback that works not showing wrong values.

[sigVince]

I see what you mean. I agree that it should continue to scroll while loading, but if you reach the end of the current batch of items before your webservice answers it could be nice for the user to know that data is going to be displayed soon. Maybe just a text info "loading data..." displayed below the last row of the current batch.

[rkonstantinov]

@meriturva Did you try the latest version of the Grid package? We have already done some improvements in this area.

@sigVince we are considering adding a "loading panel" for future version of the component.

[FedericoGalf]

I agree with @meriturva. I've tried it with a remote web api and the behavior is too annoying. It's unusable by the final user. Is it possible to have a timing for a next release with at least a loading panel?
Thanks in advance.

[sigVince]

About behavior for the user, after a bit of testing I think virtual scrolling is not a good solution. Infinite scroll is much better in most cases. Feel free to upvote my feature request about that :)
http://kendoui-feedback.telerik.com/forums/555517-kendo-ui-for-angular-2-feedback/suggestions/17816359-infinite-scrolling-for-grid

[Delta388]

Agreeing with @meriturva and @FedericoGalf, right now virtual scrolling with a remote api is not really usable, the behavior of the grid under these circumstances really needs to be improved.

[tsvetomir]

We've added a demo on how to Debounce pageChange Events. This should make remote calls practical.

We're considering adding a loading panel to indicate that the data is being fetched.

[tsvetomir]

Tracking in #666

[pran2889]

Not able to select grid row in Kendo grid
Please find below sample
https://stackblitz.com/edit/angular-kxdzur-jkx3of

Steps to reproduce :

1. Open above URL
2. Scroll to last row
3. Try to select row no 93.
4. Not able to select row as well as it jumps to other rows as well.

Let me know if anyone able to fix this issue