OK, yeah, thanks. I was also facing the problem when I was instantiating classes and setting properties w/o URLLoader. I created a very simple example and I realized the problem was my misuse of [Bindable]. I'm using Cairngorm and have all my VO objects in the ModelLocator...well, my many VO objects don't have [Bindable] declared within those classes. I lazily assumed that having [Bindable] declared in the ModelLocator would take care of everything for me. Not the case...once I added [Bindable] to each VO, everything appeared in the UI correctly. Which makes sense b/c my trace statements had the value but the UI was not updating. Sorry for the newbie brain fart!! Thanksa again Pete.
--- In flexcoders@yahoogroups.com, "Peter Farland" <[EMAIL PROTECTED]> wrote: > > Ah, right, much clearer now that I see this code. > > > The issue is that a request to an HTTP URL via something like URLLoader > is asynchronous, so the SWF script is not held up waiting for the > network to respond. This means you will need to wait until the response > comes back some time later, i.e. when the result handler is called, > before accessing the generateXML property. > > So, I would architect this a little differently. > > Decouple the logic for loading XML into a service helper class and then > when you get back a response pass that to a utility method to actually > generate the XML. > > > -----Original Message----- > From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On > Behalf Of Suzy Lawson > Sent: Monday, June 05, 2006 11:52 AM > To: flexcoders@yahoogroups.com > Subject: [flexcoders] Re: Instantiation and setting problems - Example > included > > Thanks for your response...this error is still haunting so I included > a simple example to show my problem of class variables not being able to > be set after I initialize a new class. Even if I move the "generateXML" > method into the complete Handler....the same null pointer is still > thrown. Any ideas why?? > > Top-level MXML file: > <?xml version="1.0" encoding="utf-8"?> > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"; > layout="absolute"> > <mx:Script> > <![CDATA[ > private function setValue() : void > { > var testA : TestA = new TestA(); > xmlValue.text = > testA.generateXML("55").toXMLString(); > } > ]]> > </mx:Script> > <mx:Button label="Set Value" click="setValue()"/> > <mx:Label id="xmlValue"/> > </mx:Application> > > _----------------------------------------- > //TestA class > package > { > import flash.events.Event; > import flash.net.URLLoader; > import flash.net.URLRequest; > > > public class TestA > { > private var sampleXML : XML ; > > public function TestA() : void > { > var loader : URLLoader = new URLLoader(); > loader.addEventListener(Event.COMPLETE, completeHandler); > loader.load(new URLRequest("sample.xml")); > } > > private function completeHandler(event:Event):void { > sampleXML = new XML(event.target.data); > } > > public function generateXML(value : String) : XML > { > [EMAIL PROTECTED] = value; // error is here b/c > sampleXML is 'null' > return sampleXML; > } > } > } > ------------------------------------ > sample.xml file: > <test id="" data=""/> > -------------------------- > The exact error I get is: > TypeError: Error #1009: Cannot access a property or method of a null > object reference. > at TestA/generateXML()[C:\flex\TestA.as:25] > at sampleBug/sampleBug::setValue()[C:\flex\sampleBug.mxml:8] > at sampleBug/___Button1_click()[C:\flex\sampleBug.mxml:12] > > --- In flexcoders@yahoogroups.com, "Peter Farland" <pfarland@> wrote: > > > > I'd have to see the code to really understand what is going on, but > can you avoid doing anything in a constructor and use a button or > something to trigger the work to see if that's the issue? > > > > -----Original Message----- > > From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] > On Behalf Of Suzy Lawson > > Sent: Friday, June 02, 2006 4:54 PM > > To: flexcoders@yahoogroups.com > > Subject: [flexcoders] Re: Instantiation and setting problems > > > > I'm using the Cairngorm framework, so in the implented Command > classes... > > > > For the XML problem, it's in a class that the Command class calls. > The constructor load the XML file stored locally, then the > completeHandler calls XML(event.target.data) and assigns the XML to a > local variable. > > > > However, when I instantiate this object, then call a method on it, > the XML is still null. If I put a timer on it to stall for a second, > it's there.... > > > > --- In flexcoders@yahoogroups.com, "Peter Farland" <pfarland@> wrote: > > > > > > > > > Where are you declaring these classes? > > > > > > > > > -----Original Message----- > > > From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] > > On Behalf Of Suzy Lawson > > > Sent: Friday, June 02, 2006 12:01 PM > > > To: flexcoders@yahoogroups.com > > > Subject: [flexcoders] Instantiation and setting problems > > > > > > I anyone else having issues trying to set values on objects for > > newly instantiated objects in an object graph with 3 or more layers? > > > > > > I have the following: > > > > > > ClassA { > > > public var classB : ClassB; > > > public var classC : ClassC; > > > } > > > > > > ClassB { > > > public var classD : ClassD; > > > } > > > > > > ClassC { > > > public var textVal : String=''; > > > } > > > > > > and i have a value sets in the ModelLocator (cairngorm) class like > so: > > > public var allClassAs : ArrayCollection; public var selectedClassA : > > ClassA; > > > > > > The problem is if I retrieve a single 'ClassA' from the collection > > of allClassAs using the ID of the selectedClassA, then try to make a > call like this: > > > classA.classC.text="Whatever"; > > > > > > The mxml field I have bound to that value never displays and I get > > the following debug error. > > > > > > error during evaluation > > > no such variable: classA.classC.textVal > > > > > > This kind of makes sense since classC wasn't initialized yet, so > > even if I change ClassA to be: > > > ClassA { > > > public var classB : ClassB = new ClassB(); public var classC : > > ClassC = new ClassC(); } > > > > > > I still get the same error. In the UI, if I click back, it appears > > correctly, but the first time it always fails. It seems like the set > > > (classA.classC.text="Whatever";) is getting called faster then the > > object can be initialized (constructed). > > > > > > I've had similar problems when calling: > > > var myXML = new XML(event.target.data); [EMAIL PROTECTED]"3232"; > > > > > > When I debug this, myXML is still null when the 2nd line is called. > > A work around is to instantiate the XML on startup so the XML is > there before calling the set on @ID, but means more memory. > > > > > > Anyone else hitting these issues? > > > > > > > > > > > > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor > > --------------------~--> Everything you need is one click away. > Make Yahoo! your home page now. > > > http://us.click.yahoo.com/AHchtC/4FxNAA/yQLSAA/nhFolB/TM > > > -------------------------------------------------------------------- > > > ~- > > > > > > > > > > -- > > > Flexcoders Mailing List > > > FAQ: > > > http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > > > Search Archives: > > http://www.mail-archive.com/flexcoders%40yahoogroups.com > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor > --------------------~--> Home is just a click away. Make Yahoo! your > home page now. > > http://us.click.yahoo.com/DHchtC/3FxNAA/yQLSAA/nhFolB/TM > > --------------------------------------------------------------------~- > > > > > > > -- > > Flexcoders Mailing List > > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > > Search Archives: > http://www.mail-archive.com/flexcoders%40yahoogroups.com > > Yahoo! Groups Links > > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> > Get to your groups with one click. Know instantly when new email arrives > http://us.click.yahoo.com/.7bhrC/MGxNAA/yQLSAA/nhFolB/TM > --------------------------------------------------------------------~-> > > -- > Flexcoders Mailing List > FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt > Search Archives: > http://www.mail-archive.com/flexcoders%40yahoogroups.com > Yahoo! Groups Links > ------------------------ Yahoo! Groups Sponsor --------------------~--> Get to your groups with one click. Know instantly when new email arrives http://us.click.yahoo.com/.7bhrC/MGxNAA/yQLSAA/nhFolB/TM --------------------------------------------------------------------~-> -- Flexcoders Mailing List FAQ: http://groups.yahoo.com/group/flexcoders/files/flexcodersFAQ.txt Search Archives: http://www.mail-archive.com/flexcoders%40yahoogroups.com Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/flexcoders/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
