Here's why the statement
x.label="jim";
causes the compilation error "Access of undefined property x":
A <mx:Script> is a place to declare vars and functions; you generally
don't want to put bare statements there. A bare statement in an
<mx:Script> doesn't do what you'd expect. Most people expect it to
initialize the component in some way, but it actually becomes part of
the "class constructor", which executes before any instances get
created. There is no class-level (i.e., "static") property named x on
this class, so your statement doesn't compile.
If you comment out this line, you then get another compilation error,
"Attempting to initialize inherited property 'x' of type 'Number' with
value of incompatible type 'mx.controls.Button'."
This is because your component inherits an instance property x from
DisplayObject. When you use 'x' as the id of a component, the MXML
compiler autogenerates another property named x to hold the reference to
that component. Your component would have two properties named x, which
isn't allowed.
- Gordon
________________________________
From: flexcoders@yahoogroups.com [mailto:[EMAIL PROTECTED] On
Behalf Of pauland2513
Sent: Thursday, February 08, 2007 2:22 AM
To: flexcoders@yahoogroups.com
Subject: [flexcoders] Re: properties in components..
OK, thanks guys, I guess I do need that coffee. The problem goes away
if the code is wrapped in a function (to be called on initialisation
or creation complete_ - I guess thats the only way to safely access
the properties since otherwise they may not exist. The thing that
really threw me was that the compiler only raised objections when the
component was added to the main application.
Anyway, problem solved.
Paul
--- In flexcoders@yahoogroups.com <mailto:flexcoders%40yahoogroups.com>
, "Igor Costa" <[EMAIL PROTECTED]> wrote:
>
> In Addition of Rich Tretola solution
>
> here's anothe one.
>
>
> <yours:Component creationComplete="setLabel" id="labelfill"/>
>
> <script>
> public function setLabel():void
> {
> labelfill.label = "my Label";
> }
> </script>
>
>
> Best
>
> On 2/8/07, Rich Tretola <[EMAIL PROTECTED]> wrote:
> >
> > The 1st problem is that you can not name your button id x as it is a
> > reserved word.
> >
> >
> > Not sure what you are trying to accomplish. If your goal is to be
able to
> > set the label from the main application, you should do something
like this:
> >
> >
> > <?xml version="1.0" encoding="utf-8"?>
> > <mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml
<http://www.adobe.com/2006/mxml> " width="400"
> > height="300">
> > <mx:Script>
> > <![CDATA[
> > [Bindable]
> > public var myLabel:String="jim";
> > ]]>
> > </mx:Script>
> > <mx:Button id="x1" label="{myLabel}"/>
> > </mx:Canvas>
> >
> >
> >
> > <?xml version="1.0" encoding="utf-8"?>
> > <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml
<http://www.adobe.com/2006/mxml> "
> > layout="absolute" xmlns:local="*">
> > <local:Test myLabel="Rich"/>
> > </mx:Application>
> >
> > Rich
> >
> >
> >
> > On 2/8/07, Paul Andrews < [EMAIL PROTECTED]> wrote:
> > >
> > > OK, this is driving me nuts. I'm using Flex Builder 2.01 on a PC.
> > >
> > > I have a very simple component (say test.mxml), code below,
where I set
> > > a
> > > label value on a button using actionscript.
> > >
> > > I can get this to compile very simply and we're all happy.
> > >
> > > As soon as I edit the main application(main.mxml) to include this
> > > component:
> > >
> > > <comp:test>
> > > </comp:test>
> > >
> > > main.mxml is happy but now I get a compile error (access of
undefined
> > > property) in test.mxml saying that the button id is an undefined
> > > property.
> > > When I edit the test.mxml code, flexbuilder will happily give me
code
> > > hints
> > > about the properties after I've put in the button id.
> > >
> > > What's going on? Maybe I just need more coffee?
> > >
> > > Paul
> > >
> > > <?xml version="1.0" encoding="utf-8"?>
> > > <mx:Canvas xmlns:mx="http://www.adobe.com/2006/mxml
<http://www.adobe.com/2006/mxml> " width="400"
> > > height="300">
> > > <mx:Script>
> > > <![CDATA[
> > > x.label="jim";
> > > ]]>
> > > </mx:Script>
> > > <mx:Button id="x" label="fred"/>
> > > </mx:Canvas>
> > >
> > >
> >
> >
> > --
> > Rich Tretola
> > <mx:EverythingFlex/>
> > http://www.EverythingFlex.com <http://www.EverythingFlex.com>
> >
> >
>
>
>
> --
> ----------------------------
> Igor Costa
> www.igorcosta.org
> www.igorcosta.com
> skype: igorpcosta
>
