Is there any explanation to TreeGrid’s lazy loading feature ? …
i couldnt successfully initialized the items in the first place because of the
@Override
public int getChildCount(HierarchicalQuery<AkademikBirim, Void> query) {
return akademikBirimService.getChildrenCount(query.getParent());
}
query.getParent() is null at beginning.
i remember vaadin7’s logic was simple. just add the root items … and then implement something like “additemandexpand” event. and in this event you just need to call getChildren.
But this hasChildren & getChildrenCount methods looks confusing and unnecessary. btw i got the idea why we are implementing haschildren because treegrid put an expand arrow to that item. but why is it calling getchildrencount as well ? … i dunno i made a mistake while debugging. but it was calls those two methods … always… and its reducing loading time very badly. i am fetching my data from remote restful service.
public List<AkademikBirim> getChildren(AkademikBirim parent) {
if (parent == null) {
return findAllRoots(); // all nodes that has no parents.
}
return parent.getChildrenAkademikBirim();
}
So i added “if” part. now its working.
So this is the only way to lazily loading right ? … there is no such feature “additemandexpand” like TreeTable in v7 ?