Hierarchical AdvancedDataGrid : selecting a specific index

Question

I'm trying to select some items displayed in a hierarchical
AdvancedDataGrid. The underlying items in the dataProvider have
been replaced but using their id I want to select them back in the
AdvancedDataGrid.
1) The dataGrid is displayed and item id #123 is selected
2) The datatGrid's dataprovider is replaced
3) I want to select item #123 back in the dataGrid
To do this, I loop over the new dataProvider and I compare
the ID (#123) to find the new instance of the item that should be
selected. Then I do:
myDataGrid.selectedItem = newItem;
But it doesn't seem to work for a reason I don't understand.
I did a lot of tests using all the 'validate()', 'invalidate()' and
'refresh()' methods I could find but nothing worked.
But, if I use the index instead :
var newIndexToSelect:int =
newDataProvider.getItemIndex(newItem);
myDataGrid.selectedIndex = newIndexToSelect;
It does work! But only if the dataProvider is an
ArrayCollection! It doesn't work if it's a
HierarchicalCollectionView. And I need to use GroupingCollection to
create my dataProvider because I use the tree feature of the
AdvancedDataGrid.
When the dataProvider is a HierarchicalCollectionView, I have
no idea how to select the correct index in the Grid! Some of the
row in my tree-grid are not actual items but 'groups' so I can't
map the indices of my actual items in the Collection's source to
the indices in the datagrid!
Any help or tips on how to select a particular index in a
hierarchical AdvancedDataGrid ?
Thanks a lot!
JL

Answer 1

quote:
Originally posted by:
Sreenivas R
The index based selection for hierarchical ADG is tricky
because the index of an item can keep changing depending on the
open/closed nodes before it.
Exactly.
Here's a code example, where I populate the grid with some
items and later try to select item with ID "c" using its index
("test()" method is the entry point):