Mx:DataGrid's change event is for when selection changes, not when the collection changes. Could that be the issue? collectionChange may be what you want.
________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Geoffrey Sent: Friday, May 18, 2007 10:12 AM To: [email protected] Subject: [flexcoders] Re: Does Drag & Drop Only Update the DataProvider? I don't have the code in front of me right now, but to be more precise, dgEmployees is not broadcasting a change event upon a D&D action. I want dgEmployees to broadcast an event every time there is a change to the DataGrid. The dgEmployees DataGrid has a change event method defined, somthing like: <code> <mx:DataGrid id="dgEmployees" dataProvider="{__employees}" change="broadcastEvent(event)" ...> </code> The broadcastEvent() method constructs a custom event containing the number of elements in the DataGrid, and then dispatches it to be used elsewhere. Now, as I type this, I see that I might have keyed off the wrong event, "change". Not sure if that is broadcast upon a change in the dataProvider, BUT I had been working on this code previously (converting to Flex 2.0), and I believe that I saw this same issue. I noticed that when I used the debugger to step throught the doDragDrop() method, I was seeing that only the dataProvider was being updated, and not the ArrayCollection. I can't verify this until Monday (5/21), but I'm almost 100% sure this is what I saw. --- In [email protected] <mailto:flexcoders%40yahoogroups.com> , "Alex Harui" <[EMAIL PROTECTED]> wrote: > > How do you know it didn't update __employees? > > > > Can you post a mini-example in a couple of screenfuls of text? > > > > ________________________________ > > From: [email protected] <mailto:flexcoders%40yahoogroups.com> [mailto:[email protected] <mailto:flexcoders%40yahoogroups.com> ] On > Behalf Of Geoffrey > Sent: Thursday, May 17, 2007 6:11 PM > To: [email protected] <mailto:flexcoders%40yahoogroups.com> > Subject: [flexcoders] Does Drag & Drop Only Update the DataProvider? > > > > I have a DataGrid that has a dataProvider bound to an ArrayCollection. > > <code> > <mx:DataGrid id="dgEmployees" > dataProvider="{__employees}" > ...> > </code> > > I also have another DataGrid (dgAllEmployees) that is within a popup, > which I use as a source for Drag & Drop operations to populate the > dgEmployee dataGrid. > > What I've noticed is that when I drag & drop employees from the "all > employees" DataGrid to the "employees" DataGrid, it seems to only > update the dataProvider of dgEmployees, and not the ArrayCollection > __employees. Why is this? > > Below is a snip of my drag & drop code where it actually copies the > data. This is a generic method that is used all over the application. > <code> > public static function doDragDrop( event:DragEvent ):void > { > // Prevent the default event from happening. > event.preventDefault(); > > // Get drop target > var dropTarget:DataGrid = DataGrid(event.currentTarget); > > // Get the dragged items from the drag initiator. > var dropItems:Array = event.dragSource.dataForFormat("items") as Array; > > // Add each item to the drop target. > for (var i:uint = 0; i < dropItems.length; i++) > { > var dest:IList = IList(dropTarget.dataProvider); > if (!contains(dest, dropItems[i])) > { > dest.addItem(dropItems[i]); > } > } > } > </code> > > I think that I had event.preventDefault(); in there because it was > putting 2 of each dropped item in the dgEmployee DataGrid. Might this > be messing something up? > > Also, contains() is a custom method to compare the source items to > what's in the target's list to prevent duplicates. Is there a better > way to do this? > > Thanks in advance. > GT >
