You need to attach the Bob instance to the display list before accessing
its children. This works:
public function someFunc():void
{
var b:Bob = new Bob();
addChild(b);
trace(b.test1.text);
}
A UIComponent constructor creates a new instance but doesn't initialize
it. After executing
var b:Bob = new Bob();
a Bob instance exists, but it has parent and no children. As soon as you
attach a new instance to a parent, it then creates its children, and
when they are attached they create their children, etc. In this way the
tree grows downward recursively.
One reason we designed it this way is so that between the 'new' and the
addChild(), you can set properties and styles on the instance which then
affect which children get created.
For example, suppose you had a Clock component with had two modes,
analog and digital, which require different children to display. Then
you could write
var clock:Clock = new Clock();
clock.mode = "digital";
addChild(clock);
and then the hands and the 12 TextFields to display the hours around the
analog clock wouldn't need to be created; you could delay creating them
until you set clock.mode = "analog".
- Gordon
-----Original Message-----
From: [email protected] [mailto:[EMAIL PROTECTED] On
Behalf Of Trey Long
Sent: Thursday, January 26, 2006 9:35 AM
To: [email protected]
Subject: [flexcoders] MXML mixed with AS is null
This problem seems obvious, but I didn't get any hits when I searched
so...
I have an MXML application, A.mxml;
and an MXML component C.mxml.
There seems to be an initialization problem when I attempt to create
that MXML component C from within a <mx:script> tag in application A. It
seems that the label in component C, test1, isn't initialized at that
point.
I know this is hard to follow, but if anyone else thinks they know what
I am talking about please let me know.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.macromedia.com/2005/mxml"; xmlns="*"
xmlns:local="package1.*" creationComplete="someFunc();">
<mx:Script>
<![CDATA[
import flash.util.trace;
public function someFunc() {
var b:Bob = new Bob();
//trace(b.test1.text);
}
]]>
</mx:Script>
</mx:Application>
<?xml version="1.0" encoding="utf-8"?>
<mx:Canvas xmlns:mx="http://www.macromedia.com/2005/mxml"; xmlns="*">
<mx:Label id="test1" text="TEST STRING" />
</mx:Canvas>
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