Can I use the lazy-option of the Angular PrimeNG treeTable without virtual scroll?

Question

Hey guys i stumbled about some problems with the lazy loading option of the prime ng treeTable. I need to use the lazyLoad event (Output property "onLazyLoad") without the virtual scroller behavior. Is this somehow supported by the treeTable component?

Something like this:

<p-treeTable [value]="virtualFiles" [columns]="cols" [scrollable]="true" [rows]="20" 
    [virtualRowHeight]="34" [lazy]="true" (onLazyLoad)="loadNodes($event)"
    [totalRecords]="totalRecords" scrollHeight="400px">
</p-treeTable>

If it's not possible to use lazy loading without the virtual scroller it would be okay if I at least could prevent it from destroying the previous loaded Elements.

I already tried setting the rows-property to the length of the values-array to prevent fetching more data when scrolling upwards.

Would be great if someone could help me with this.

Answer 1

In my view, virtual scrolling is an alternative to paging.

How does it work?

From my point of view, the virtual scrolling relies on calculations that are based on the [virtualRowHeight]="34" and [rows]="20", and then it calculates the desired size of data to be loaded. So, it is necessary to predefine [virtualRowHeight] and [rows], to ensure the proper functioning of the data virtualization, loading, and rendering of the correct items.

So when you work with many rows, it is necessary to use [virtualScroll]="true"