TreeDataGrid item selection and pre-positionning

Support
#1

Hi,

I’m trying to open a browse screen with TreeDataGrid from a LookupPickerField. I want to select a specific item (leaf in a hierarchy), expand ancestors and scroll to it.

I manage to select the item like this:

	@Subscribe
	protected void onAfterShow(final AfterShowEvent event) {

		if (null != this.hierarchieClient) {

			this.hierarchieClientsTable.setSelected(this.hierarchieClient);
			this.hierarchieClientsTable.scrollTo(this.hierarchieClientsTable.getSingleSelected(), DataGrid.ScrollDestination.MIDDLE);
		}
	}

but .scrollTo() throw an exception (row outside of datacontainer size). Indeed, selected row is position 388 and first level ancestors group size is 160

Best regards, Stef.

#3

Hi,

In order to expand a certain branch down to the item, you need to expand all item parents, e.g.:

@Inject
private CollectionContainer<Group> groupsDc;
@Inject
private TreeDataGrid<Group> dataGrid;

@Subscribe
public void onAfterShow(AfterShowEvent event) {
    Group item = <required_item>;

    Group parent = item.getParent();
    List<Group> itemsToExpand = new ArrayList<>();
    while (parent != null) {
        itemsToExpand.add(parent);
        parent = parent.getParent();
    }

    dataGrid.expand(itemsToExpand);
    dataGrid.setSelected(item);
}

Regarding the scrollTo method. It’s a bug and I’ve created a GitHub issue.

Regards,
Gleb

1 Like
#5

I see that issue is fixed in 7.1, thank you.