In MXML you cannot evaluate constants as attribute names so
viewChanged= is required ________________________________ From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of bpjim Sent: Wednesday, February 06, 2008 8:51 AM To: [email protected] Subject: [flexcoders] Differences between MXML and ActionScript in setting event listeners? I have a custom component (PlotControls.mxml). It inherits from DisplayObject (via HBox), so my understanding is that it will support event bubbling. In it I have defined a 'viewChanged' event: <mx:Metadata> [Event(name="VIEW_CHANGED", type="flash.events.Event")] </mx:Metadata> public static const VIEW_CHANGED:String = "viewChanged"; In that component I also have some AS code which broadcasts that event (notice that bubbling is TRUE): private function viewSelectedHandler():void { dispatchEvent(new Event(PlotControls.VIEW_CHANGED, true)); } ------------- Next, I have a parent component, which also inherits from DisplayObject via HBox. In the parent component, I have created an instance of the first (child) component: <timeSeriesPlots:PlotControls id="plotControls" plotViews="{AppData.getInstance().selectedExpTimeSeriesViews}" /> I also have some initializer code in the parent component which adds an event handler to the child component: private function initComponent():void { plotControls.addEventListener(PlotControls.VIEW_CHANGED, viewSelectedHandler); } And the handler code looks like this: private function viewSelectedHandler(e:Event):void { var plotId:String = plotControls.getPlotId(); Alert.show('viewSelectedHandler(); plotId: '+plotId); } All of the code ABOVE works as expected: when the UI in the child component dispatches the event, the parent component's event handler is getting called. ------------- On the other hand, I tried setting the event listener directly on the child component itself via the MXML markup (and removed the addListener call from the parent's initializer): <timeSeriesPlots:PlotControls id="plotControls" plotViews="{AppData.getInstance().selectedExpTimeSeriesViews}" VIEW_CHANGED="viewSelectedHandler(event);" /> Note: the Flex Builder IDE is showing me 'code completion' information for the VIEW_CHANGED event, so I think that I have the right syntax here, at least. BUT THIS DOESN'T WORK! (The event handler is never invoked.) *** My Question: why does the event handler, viewSelectedHandler(), for the VIEW_CHANGED event NEVER get called when I add the listener directly via the MXML markup? My understanding of Flex is that these two approaches should yield the same results (though using addListener() gives you more options. What am I overlooking here--this one has me stumped. Could someone please give me a clue? Thanks in advance, Jim
