Kendo-angular: Virtual scrolling triggers lots of refreshes when scrolling

[sigVince]

When virtual scrolling a grid with huge amounts of data, Grid will trigger lots of refreshes. Would be great to refresh only when scrolling is over, or add a debounce.
We are working with 100.000+ rows, and this is triggering lots of webservice calls thus lots of database queries. I've tried cancelling the previous request when a new one is triggered, but it's still a lot of requests gone to the server. I guess I could try debouncing it on my side, but I think it should be managed by the Grid component.

Or actually, is there a way maybe with an other scroll mode to have the scrollbar cover only the downloaded elements, and add more when I scroll all the way down, while keeping the first elements displayed? Like in a facebook/twitter feed, typically.

[tsvetomir]

We used to do debounce scrolling before, but decided against it in later versions.

@rkonstantinov can correct me, but I think the reason was that it created unacceptable lags when working with local data. You can still debounce the pageChange event to the desired rate. This is pretty straight-forward as EventEmitters are Subjects. See this snippet for an example. We'll add it to the docs as well.

[rkonstantinov]

Indeed that is correct. We decided that it is up to the consumer to decide if the debounce is required, providing more control based on the scenario at hand.

[sigVince]

You can close this btw.

In the end we're not going to use virtual scrolling anyway. Classic pagination for now. What we could use is infinite scrolling (facebook-like), is something like this planned in the future of kendo-angular, or shall we work on a custom solution?

[tsvetomir]

This is my observation with virtual scrolling as well - it's cool for demos, but its usability leaves a lot to be desired.

Please, file a request for endless scrolling on our UserVoice portal if you have minute.
This will help us gauge the overall interest and prioritize.

[sigVince]

Thanks, I've done so. Would be a great feature, and probably quick to dev given it's close to virtual scrolling in behavior.

http://kendoui-feedback.telerik.com/forums/555517-kendo-ui-for-angular-2-feedback/suggestions/17816359-infinite-scrolling-for-grid