It's been happening with all configurations, but intermittently. I've had 0 success reproducing it at will, even though myself and multiple users have come across it on non-dev environments.
My troubleshooting has mostly been releasing things I think *might* have an impact, then asking users to send screen caps if they come across the issue again. It seems to be occurring regularly, although a hundred runs of the code below haven't shown it on my dev box. So I can't tell if there are any console messages at runtime. There are no compile-time warnings, and there weren't any of these issues when compiling with Flex 3 (swapping Spark components for Halo). Below is an 80-line, 4-file example I've been trying to use to attempt to reproduce the problem. I have not been successful reproducing it, but the structure and components used below closely resembled the full app. Only thing missing is that the full app has a set of Mate controllers and a bunch of AMF remote calls. Nothing those touch seem to be affected though. Since this problem is so hard to reproduce, I don't expect a resolution here. Just seeing if I'm doing something glaringly wrong or if the problems sound familiar to other developers. <?xml version="1.0" encoding="utf-8"?> <s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"; xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600" xmlns:local="*" > <fx:Declarations> <local:MyModel id="model" /> </fx:Declarations> <mx:ViewStack selectedIndex="{model.viewStackIndex}"> <s:NavigatorContent showEffect="Fade" hideEffect="Fade" > <local:Page1 model="{model}" /> </s:NavigatorContent> <s:NavigatorContent showEffect="Fade" hideEffect="Fade" > <local:Page2 model="{model}"/> </s:NavigatorContent> </mx:ViewStack> </s:Application> // MyModel.as package { [Bindable] public class MyModel { public var viewStackIndex:Number=0; public var one:String="one"; public var two:String="two"; public var three:String="three"; public var four:String="four"; } } // Page1.mxml <?xml version="1.0" encoding="utf-8"?> <s:Group xmlns:fx="http://ns.adobe.com/mxml/2009"; xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" width="400" height="300" xmlns:local="*"> <fx:Declarations> <local:MyModel id="model" /> </fx:Declarations> <s:Button label="Forward" x="150" y="100" click="model.viewStackIndex = (model.viewStackIndex == 0) ? 1 : 0;"/> </s:Group> // Page2.mxml <?xml version="1.0" encoding="utf-8"?> <s:Group xmlns:fx="http://ns.adobe.com/mxml/2009"; xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx" width="400" height="300" xmlns:local="*" > <fx:Script> <![CDATA[ import mx.collections.ArrayList; ]]> </fx:Script> <fx:Declarations> <local:MyModel id="model" /> </fx:Declarations> <s:TextInput x="10" y="10" text="{model.one}" /> <s:CheckBox x="250" y="10" label="{model.two}" selected="{model.two=='two'}" visible="{model.two=='two'}" /> <s:Button label="Back" x="150" y="100" click="model.viewStackIndex = (model.viewStackIndex == 0) ? 1 : 0;"/> <s:Label x="10" y="200" text="{model.three}" /> <s:DropDownList x="250" y="200" selectedItem="{model.four}" dataProvider="{new ArrayList(['bar', 'four', 'bar', 'bar', 'bar', 'bar'])}" /> </s:Group> --- In [email protected], Alex Harui <aharui@...> wrote: > > So is this intermittent or just never works in this configuration? Are there > console warning about not being able to detect changes? > > Can you make a 20-line test case? > > > On 3/20/12 7:05 PM, "Uber_Nick" <nick14@...> wrote: > > > > > > > Nope, no difference with one vs two-way Bindings. I discovered this problem > with DropDownLists that had one-way bindings and used the change event to > update the value vo. I may have even been using selectedIndex instead of > selectedItem-- don't remember. > > The problem persisted after I tried two-way bindings. > > Funny thing about it would be that the DropDownList would say "May" but the > value of the VO would still be "February". I'd then change the DropDownList > to "June" and the VO would update to "June". So the pointers were all > referencing the right objects. > > Even stranger-- changing the VO again externally would not update the > DropDownList. Something was going on with either the binding inside the > DropDownList or the display/render function. I would have blamed that > component if it weren't also happening on Input Boxes. > > --- In [email protected] <mailto:flexcoders%40yahoogroups.com> , > Alex Harui <aharui@> wrote: > > > > If you take off the two-way binding does it work? > > > > > > On 3/18/12 7:41 PM, "Uber_Nick" <nick14@> wrote: > > > > > > > > > > > > > > I haven't tried explicitly re-setting the value manually or with > > BindingUtils, but that's something I'll try now! Should still be working > > without that. > > > > I have a feeling the problem is actually in the display logic of the > > component. Like perhaps some built-in efficiency code to ignore binding > > updates when it's hidden. But I'll have to deep-dive a little further to > > verify that. It's more likely something I'm missing or doing wrong. > > > > --- In [email protected] <mailto:flexcoders%40yahoogroups.com> > > <mailto:flexcoders%40yahoogroups.com> , yang chen <chenyang3@> wrote: > > > > > > Have you tried using binding util? > > > > > > > To: [email protected] <mailto:flexcoders%40yahoogroups.com> > > > > <mailto:flexcoders%40yahoogroups.com> > > > > From: nick14@ > > > > Date: Fri, 16 Mar 2012 20:08:47 +0000 > > > > Subject: [flexcoders] Bindings on visual components being forgotten? > > > > (Flex 3 -> 4.6) > > > > > > > > Seeing a strange, rare, issue after updating an app to 4.6. I can't > > > > seem to reproduce it in a dev environment, so I'll list out my issue > > > > and setup to see if it sounds familiar to anyone. > > > > > > > > The problem: > > > > Visual components seem to occasionally "forget" the objects they're > > > > bound to. For instance, I have something like this: > > > > > > > > <s:DropDownList > > > > id="cmbMonth" > > > > dataProvider="{model.months}" > > > > selectedItem="@{model.selectedMonth}" > > > > /> > > > > <s:Label text="{model.selectedMonth}" /> > > > > > > > > When the problem occurs, the "selectedMonth" in the label component is > > > > correct, say, February. But the DropDownList will display a blank. > > > > Even though the DropDownList contains all the months, meaning > > > > models.months is bound correctly. > > > > > > > > I tried adding: > > > > requireSelection="true" > > > > > > > > The addition changed the behavior. No more blanks! But now, instead > > > > of blanks, selectedMonth is showing something random like "May". > > > > > > > > Background: > > > > App has been in production in various versions of Flex 3 for two years > > > > without ever seeing this. Upgrading to Flex 4 and swapping out some > > > > Halo components with equivalent Spark ones, users, myself included, > > > > began noticing this phenomenon. I cannot seem to reproduce it in a > > > > reliable fashion. But I've gotten some feedback based on some > > > > attempted fixes pushed out to users. > > > > > > > > Troubleshooting so far: > > > > Since it normally works, there's no super-obvious things missing, like > > > > an uninitialized pointer, missing "Bindable" tag, accidental = > > > > assignment instead of == comparison, etc. > > > > > > > > Also, we know the variable references are pointing to the correct > > > > place. model.selectedMonth is showing up fine for a label just > > > > underneath the dropdown. model.months is being referenced just fine by > > > > the dropdown itself. It's just the display of model.selectedMonth in > > > > the dropdown. Upon saving, the model.month property correctly > > > > propagates itself to the DB, even when the dropdown is displaying the > > > > wrong value. Switching between one-way and two-way bindings don't seem > > > > to make a difference either. I noted above that I tried forcing > > > > requireSelection="true", which does prevent the DropDownList from being > > > > blanked-out, but doesn't force it to stay on the correct value. > > > > > > > > I thought it might be related to just the DropDownList component, but > > > > the problem is also occurring on s:TextInput's text property. Seems > > > > like when it happens with the TextInput component (showing a blank > > > > value), it's doing so for all the TextInput components. I'm not so > > > > sure if it's happening for all DropDownList elements, though. > > > > > > > > > > > > App setup: > > > > I have an mx:ViewStack attached to hide/show effects with two > > > > containers inside (loggedOff/loggedOn), and a TabNavigator within that. > > > > I think the problems are only occurring after switching between states > > > > for the ViewStack. So after the components are hidden and come back. > > > > I remembered back to the Flex 2 ViewStack issue where bindings didn't > > > > refresh, and added the old workaround to my code: > > > > change="executeBindings(true)" > > > > > > > > This didn't fix it. Anything else I can look at or try? Anyone else > > > > experience this before? Any chance it's related to the framework > > > > instead of my code? > > > > > > > > > > > > > > > > ------------------------------------ > > > > > > > > -- > > > > Flexcoders Mailing List > > > > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > > > > Alternative FAQ location: > > > > https://share.acrobat.com/adc/document.do?docid=942dbdc8-e469-446f-b4cf-1e62079f6847 > > > > Search Archives: > > > > http://www.mail-archive.com/flexcoders%40yahoogroups.comYahoo! Groups > > > > Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > -- > > Alex Harui > > Flex SDK Team > > Adobe Systems, Inc. > > http://blogs.adobe.com/aharui > > > > > > > > > -- > Alex Harui > Flex SDK Team > Adobe Systems, Inc. > http://blogs.adobe.com/aharui >
