In general each object and sub-object and property needs to dispatch events when changed, and your binding needs to watch each level. IOW, for the expression a.b.c, there needs to be an event dispatched when a changes, when b changes and when c changes, and if you want to detect changes to c, your binding expression needs to be checking c for changes.
In this example, there is no events dispatched when xlc changes (which should cause a warning), and there is no binding to tc1.xlc so nothing is checking for changes to xlc (which is why you didn't get a warning). It is always easier to set this up in MXML than in AS, so you have some choices about how to set it up. Alex Harui Flex SDK Developer Adobe Systems Inc.<http://www.adobe.com/> Blog: http://blogs.adobe.com/aharui From: [email protected] [mailto:[email protected]] On Behalf Of Greg Lafrance Sent: Monday, November 16, 2009 9:38 PM To: [email protected] Subject: [flexcoders] Re: Binding not working in custom class and DataGrid using XMLListCollection I'm kind of new to this type of binding. I'm not getting any warnings. I just thought the binding would work as is. --- In [email protected]<mailto:flexcoders%40yahoogroups.com>, Alex Harui <aha...@...> wrote: > > Are you getting binding warnings in the console? TestClass1 doesn't seem to > declare any bindable events or dispatch any. > > Alex Harui > Flex SDK Developer > Adobe Systems Inc.<http://www.adobe.com/> > Blog: http://blogs.adobe.com/aharui > > From: [email protected]<mailto:flexcoders%40yahoogroups.com> > [mailto:[email protected]<mailto:flexcoders%40yahoogroups.com>] On > Behalf Of Greg Lafrance > Sent: Monday, November 16, 2009 9:15 PM > To: [email protected]<mailto:flexcoders%40yahoogroups.com> > Subject: [flexcoders] Binding not working in custom class and DataGrid using > XMLListCollection > > > > I have a class with an XMLListCollection, and I am using that class xlc as > the dataProvider in a DataGrid, but when I change the xlc in the class > instance, the DataGrid does not reflect the change. Any ideas? > > ----- TestClass1.as ----- > package > { > import flash.events.EventDispatcher; > > import mx.collections.XMLListCollection; > > public class TestClass1 extends EventDispatcher{ > private var xml_1:XML = > <root> > <item>one</item> > <item>two</item> > <item>three</item> > </root>; > > private var xml_2:XML = > <root> > <item>ten</item> > <item>twenty</item> > <item>thirty</item> > </root>; > > private var _xlc:XMLListCollection = new XMLListCollection(xml_1..item); > > public function TestClass1(){ > } > > public function get xlc():XMLListCollection{ > return this._xlc; > } > > public function loadData():void{ > this._xlc = new XMLListCollection(xml_2..item); > } > } > } > > ----- TestApp.mxml ----- > <?xml version="1.0" encoding="utf-8"?> > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; > width="100%"> > <mx:Script> > <![CDATA[ > import mx.collections.XMLListCollection; > private var tc1:TestClass1 = new TestClass1(); > > [Bindable] private var xlcCollection:XMLListCollection = tc1.xlc; > ]]> > </mx:Script> > <mx:DataGrid dataProvider="{xlcCollection}"/> > <mx:Button label="Change Data" click="tc1.loadData();"/> > </mx:Application> >
