Tree/TreeTable: Virtual Scroller

[CompartMJU]

Currently only the DataTable supports virtual scrolling, while Tree and TreeTable load all displayed rows into the DOM.

For performance, it would be good to have some kind of virtual scrolling also avaiable for the Tree variants.

I found only this issue for primereact, which was closed and added to their internal backlog, so no idea if there were any plans to implement this.

[melloware]

Thanks @CompartMJU for the report. For now we are focusing on a stable build and migration and hopefully fixing defects only until we get a larger following. Then we can consider adding features.

But now this is community driven if someone submits a PR that solves a feature issue we are always open to it!

[sja-cslab]

lazy laoding can be used until this feature is implemented

https://mantle-ui.github.io/mantle-ui/treetable/#lazy_load
https://mantle-ui.github.io/mantle-ui/tree/#lazy

[CompartMJU]

@melloware Thanks, that's completely understandable.
@sja-cslab Thanks, unfortunately, we can have many children on a single level, so even in lazy mode, if an item is expanded, still everything on that level is loaded into the DOM at once, so the same issue exists without virtual scrolling.
E.g.
https://stackblitz.com/edit/d7saa9ql
https://stackblitz.com/edit/1tdjjrze

[sja-cslab]

@melloware Thanks, that's completely understandable. @sja-cslab Thanks, unfortunately, we can have many children on a single level, so even in lazy mode, if an item is expanded, still everything on that level is loaded into the DOM at once, so the same issue exists without virtual scrolling. E.g. https://stackblitz.com/edit/d7saa9ql https://stackblitz.com/edit/1tdjjrze

I see but as @melloware mentioned we're currently on migration/stable phase and do not implement features yet. However, you're more than welcome to implement that.