--- In flexcoders@yahoogroups.com, muruga <murugave...@...> wrote: > > > Hi > > I have advanceddatagrid in which i am displaying the data in Tree structure. > Since the data is huge and it is taking lots of time to retrieve from > databse, we wanted build the tree dynamically. Means initially we want to > display the tree only will the parent nodes. Only when the user expands the > parent node, we need to build the children node of this parent node (only > when the user expands the parent node, we go to DB and retrieve the children > node details). Is it possible to do this with FLEX advanceddatagrid tree > structure. First i would like to know, is it feasible to do? if yes, then > how to do it. It is very urgent.
I've done this, not with an AdvancedDatagrid, but with a HierarchicalCollectionView, which is what an ADG dataProvider is. Essentially, I called a service that gave me the top level of the hierarchy. The objects that populate the HierarchicalCollectionView each have a method that loads the children. I don't wait for the user to open the nodes. Instead, I start loading the children in the background by calling this method as soon as the top level is known. The child object will generate an event when its children are loaded, and then the parent class (which has the HierarchichalCollectionView as a property) will call the next child in the line. If a user selects a child that has not loaded its children yet, when the event fires that says the last child was loaded, I interrupt the predictive load to load that one. This has been discussed recently on here, and I think the person who was doing this type of load on a Tree control had to do something once the load was complete to tell the node to open. HTH; Amy
