You are sure you are using the Collection API exclusively? And not doing any direct assignments of values to item porperties? For example:
var oCurrentItem:MyItem = myAC.getItemAt(0); oCurrentItem.myProperty = "myValue"; //direct assignment does not cause UI to update If you are doing any of the above, then you need to call itemUpdated() after the assignment. Tracy ________________________________ From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Tim Hoff Sent: Saturday, October 18, 2008 5:14 PM To: flexcoders@yahoogroups.com Subject: [flexcoders] Re: Crazy DataGrid display of XMLListCollection Hi, If the dataProvider is [Bindable], the DataGrid should reflect the changes to the dataProvider; when the dataProvider is changed. For the itemRenderer question, here's one way to update the display list: override public function set data(value:Object):void { if (value != null) { super.data = value; // do something conditional super.invalidateDisplayList(); } } However, since there isn't any conditional changes to the itemRenderer, this would be unnecessary. -TH --- In flexcoders@yahoogroups.com, "edlueze" <[EMAIL PROTECTED]> wrote: > > I am trying to update the display of an XMLListCollection in a > 2-column DataGrid but I am getting crazy results. > > The XMLListCollection contains following data: > > <item><order>1</order><content>AAA</content></item> > <item><order>2</order><content>BBB</content></item> > <item><order>3</order><content>CCC</content></item> > <item><order>4</order><content>DDD</content></item> > > I am providing the user with two buttons to raise or lower the content > within the XMLListCollection. For example, if the user selects the > 'CCC' row and clicks the 'RaiseButton' then the XMLListCollection will > change to: > > <item><order>1</order><content>AAA</content></item> > <item><order>2</order><content>CCC</content></item> > <item><order>3</order><content>BBB</content></item> > <item><order>4</order><content>DDD</content></item> > > Note that the order field is recalculated to always be increasing - > and the content field is reordered. > > I've created a new Class that extends XMLListCollection with two new > functions: 'raiseItem' and 'lowerItem'. These new functions take > copies of the XML for the 'BBB' row and the 'CCC' row, and then rely > upon the XMLListCollection function 'setItemAt' to do the reordering. > The underlying XMLList is then sent to a server for processing. This > seems to work perfectly and traces of the XMLListCollection always > seem correct. > > Unfortunately the XMLListCollection display in the DataGrid fails to > keep up with changes in the underlying data. > > I've tried lots of combinations of 'invalidateDisplayList', > 'invalidateList', 'validateNow', 'refresh' and 'sort'. I've tried > nullifying and resetting the 'dataProvider'. And I've tried copying > over the entire list XMLListCollection one element at a time into a > new display version of the XMLListCollection. Often I get duplicate > display rows, but sometimes I get the entire list displayed in reverse?! > > I suspect the itemRenderers aren't getting the message that they > should be refreshing (one column uses the 'labelFunction' and the > other has a not-too-complicated custom itemRenderer). > > How would I go about invalidating the display of *each* itemRenderer > individually? What else should I try?? > > Thanks! >
