I have a 3 level CellBrowser. Everything is working fine using a
ListDataProvider except that it's too long to grab the data from the server.
So I want to use the AsyncDataProvider to fetch only the data that the user
actually needs. Basically what I want to do is when the user selects the
level1 value, the level2 provider executes a RPC call to get the level2 data
based on the selected level1 parent. The problem is that the onRangeChanged
method is called before the onSelectionChange, so when the RPC call is done
the level1 value is still null. What is the proper way to use
AsyncDataProvider to grab the level2 data depending on the level1 selected
value?
public class SportTreeModel implements TreeViewModel, Handler {
private AsyncDataProvider<Level1Node> level1Provider;
private AsyncDataProvider<Level2Node> level2Provider;
private final SingleSelectionModel<Level1Node> level1SelectionModel;
// In the construtor I create these objets
// In getNodeInfo I link a cell with the data provider and the selection
model
@Override
public void onSelectionChange(SelectionChangeEvent event) {
Object src = event.getSource();
if (src == level1SelectionModel) {
Level1Node level1 = level1SelectionModel.getSelectedObject();
((MyAsyncLevel2Provider)
level2Provider).setLevel1(level1.getValue());
}
}
}
Thanks
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