Grid initially loads more than page size number of items when configured to lazy load

Description of the bug / feature

I’m looking to implement lazy load to a grid with a custom backend data provider. I’m trying to load ~5 rows initially (total item count is 33 from the backend)

grid.setPageSize(5);
grid.setDataProvider(dataProvider);

However it seems like the data provider would just return all 33 (default limit is 50 according to what I read from the docs?) because the grid has determined that there’s a scroll bar so it could load up to 50 items? This comment on stackoverflow describes what I think I’m experiencing

Versions:

- Vaadin / Flow version: 14.4.10
- Java version: 11

[miguelatvaadin]

Hi @fionnachan,

I’ve been told that there are plans to change this behavior, so you will be able to change the minimum rows that the grid needs to load.

I have opened a new issue in the grid component repository (https://github.com/vaadin/vaadin-grid/issues/2166), so you can follow up it from there.

Thanks and best regards

[fionnachan]

Thanks for the reply @miguelatvaadin. In my case, because I have several component columns, preloading 25 rows is enough to slow down the page load. Is there any way to get around this to reduce the number of preloaded items?