Hi, all,
In Flex 3 I have a Tree control that is doing dynamic loading of
children. To simplify: I do a search that retrieves a root set of 15
folders. When I click on a folder, a function executes that retrieves
the children and expands the folder to reveal them. This works
correctly - the tree now displays the original 15 folders plus all
the children of the folder I clicked on.
On the other hand, if instead of clicking on the folder, I click on
the plus sign (or on Mac the triangle) to the left of the folder, the
folder opens and displays items, but the total number of items
displaying in the tree is only 15 (the same number as the original
number of folders) - so some of the folders disappear, and only a few
children display in the open folder. If I close the folder using the
minus and reopen it with the plus, all the items that should be
displaying do then appear (i.e., the 15 folders plus all the
children).
What is odd is that I am using basically the same function for both
events, the main difference being the event that is being passed to
it.
Here are the two functions:
private function handleTreeChange( event:Event ):void
{
var selectedItem:Object = Tree( event.target ).selectedItem;
if( selectedItem is FolderNode )
fetchFolderInfo( FolderNode( selectedItem ) );
}
private function handleRetrieve( event:TreeEvent ):void
{
if( event.item is FolderNode && event.opening )
fetchFolderInfo( FolderNode( event.item) );
}
private function fetchFolderInfo( folder:FolderNode ):void
{
//Items contains the children of the FolderNode
//so if the folder already has items, don't go doing
// the whole search thing
if( folder.Items.length != 0 )
return;
loadingPanel.visible = true;
catalogTreeGenerator.getFoldersOrStyles(theRootDBName, folder.Id,
theCatalogFKName);
catalogTreeGenerator.addEventListener("nonRootItemsArrayReady",
addFolderItems);
function addFolderItems(e:Event):void{
folder.Items = new ArrayCollection(e.currentTarget.fsItems as
Array );
catalogTree.validateNow();
catalogTree.expandItem( folder, true, true, false );
loadingPanel.visible = false;
catalogTreeGenerator.removeEventListener
("nonRootItemsArrayReady", addFolderItems);
}
}
Can anyone shed any light on why clicking on the plus next to a
folder the first time (doing the handleRetrieve function triggered
by "itemOpening" event) would cause the tree to only display a number
of items equal to the original number of folders, when clicking on
the folder itself (doing the handleTreeChange function triggered
by "change" event) causes the tree to display all the appropriate
items?
Thanks very much for any help.
-Flummoxed flex_geeklet
