Hi, 1) I bind the selectedItem property of a List component to a variable
2) View the value of that variable on "change" event for the List If the binding is performed by mx:Binding, on change event, the value of the bound variable would be the latest value selected. However, if binding had been done using BindingUtils.bindProperty, the value of the variable available on "change" would be the previously selected value and not the latest, unlike the previous case. Test Case: ------------------------------------------ <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; creationComplete="init()"> <mx:Script> <![CDATA[ import mx.binding.utils.BindingUtils; [Bindable] public var boundvar:Object; public function init():void { BindingUtils.bindProperty (this, "boundvar", mylist, "selectedItem"); } ]]> </mx:Script> <!-- <mx:Binding source="mylist.selectedItem" destination="boundvar"/> --> <mx:Array id="granularity"> <mx:Object label ="Item1"/> <mx:Object label ="Item2"/> <mx:Object label ="Item3"/> <mx:Object label ="Item4"/> </mx:Array> <mx:List id="mylist" dataProvider="{granularity}" labelField="label" change="trace(boundvar.label)"/> </mx:Application> -------------------------------------- In the attached case, binding has been done via BindingUtils. It would complain when you first select an item as the previous value of the variable was null, even though it should have been populated by the latest value via Binding before the change event is triggered. Comment this and uncomment the mx:Binding line to observe the change in behaviour. Flex Version: 2.0.1 Thanks, Aman Thind --- In [email protected], "Alex Harui" <[EMAIL PROTECTED]> wrote: > > Binding should run first. Can you make a small test case? > > > > You can use callLater to delay processing. > > > > ________________________________ > > From: [email protected] [mailto:[EMAIL PROTECTED] On > Behalf Of cuddlygunchi > Sent: Thursday, October 11, 2007 7:30 PM > To: [email protected] > Subject: [flexcoders] Ensuring Bindings get executed before using bound > variables > > > > Hi, > > I have a list component whose selectedItem is bound to a variable in > my model. > > On "change" event i perform an action that expects the variable in my > model to hold the new selectedItem in the list. However, it still > contains the old value at that time. Calling executeBindings before > my action did not help either. > > Is it that the change event is triggered before the bindings take > effect? What event should i use then? > > How can I force all bindings on a ui component to get executed before > moving on to the next step that expects updated values? My bindings > exist both in actionscript as BindingUtils.bindProperty and in mxml > as mx:Binding. > > Many Thanks, > Aman >
