Thanks Alex, Jim, I'm sprinkling around some try/catch statements and
I'll try debugging this a little further. Seems something in my class
is getting a null value somewhere, so that's a start anyway.
Jason Merrill
Bank of America
GT&O L&LD Solutions Design & Development
eTools & Multimedia
Bank of America Flash Platform Developer Community
________________________________
From: [email protected]
[mailto:[EMAIL PROTECTED] On Behalf Of Jim Hayes
Sent: Friday, February 01, 2008 1:34 PM
To: [email protected]
Subject: RE: [flexcoders] Set dataProvider method stops at
midpoint?
That's making sense for me now, a few days ago I made a *very*
stupid mistake and saw exactly the same symptoms as you, Jason. Again, a
simple bare bones test showed everything working exactly as expected,
yet the flow of execution in the application itself stopped dead with no
error raised. Stepping in the debugger last saw it disappearing
somewhere(?) into the binding code ... Whilst totally confused at the
time, luckily I did spot my obvious error whilst scratching my head and
looking at the method in question ...
Thanks Alex, that does help me understand why.
-----Original Message-----
From: [email protected]
<mailto:flexcoders%40yahoogroups.com> on behalf of Alex Harui
Sent: Fri 01/02/2008 18:11
To: [email protected]
<mailto:flexcoders%40yahoogroups.com>
Subject: RE: [flexcoders] Set dataProvider method stops at
midpoint?
Don't forget Jason, we're all new to AS3, no matter how much
time you
spent with AS2. In AS3, if some outer method in your call stack
has a
try/catch handler (which binding does), then if something in the
"new
MyClass" line throws an error, you'll see exactly what you
described.
________________________________
From: [email protected]
<mailto:flexcoders%40yahoogroups.com>
[mailto:[email protected] <mailto:flexcoders%40yahoogroups.com>
] On
Behalf Of Merrill, Jason
Sent: Friday, February 01, 2008 8:21 AM
To: [email protected]
<mailto:flexcoders%40yahoogroups.com>
Subject: [flexcoders] Set dataProvider method stops at midpoint?
I'm somewhat new to Flex, but NOT new to Actionscript, and this
is the
oddest and one of the most frustrating things I have ever had to
debug.
I'm sure it's just me not understanding how Flex, components,
and
databinding works, but I'm at a loss. The core of my question
is: What
could cause a method to stop executing completely in the middle
and not
have the debugger complain of any errors? I have verified this
happens
in my application through trace statements, but have not been
able to
reproduce it with simple test cases which mimics the same
structure (as
far as I can tell).
I have an actionscript-written component that extends
UIComponent. In
the main app, I have some dummy data put into an ArrayCollection
which
is in an init() function, which is fired upon the Flex app's
creationComplete event (see sample code at the bottom of this
post). In
the component which extends UIComponent and overwrites some
methods
(code snippet below), I have a set dataProvider function which
takes in
the data from the dataProvider parameter for the component in
MXML, but
it seems to hang up halfway through. The method sets the
dataProvider
data to a private variable, and then creates an instance of
another
class:
//snippet
[Bindable]
private var _dataProvider:ArrayCollection;
public function set dataProvider(_dp:ArrayCollection):void
{
_dataProvider = _dp;
trace("this traces fine, and data received.");
_myClass = new MyClass(this, _dp); //why would this stop the
method?
trace("This never traces!!!!!");
addChild(_myClass);
}
The first trace works fine, the second never traces, and I don't
get any
debugger or console messages (Flexbuilder 2)! So I thought,
maybe there
was some code in my "MyClass" (not the real name, but keeping it
simple
here) which extends sprite which is not working right - but I've
searched through MyClass and the other class it uses, and all
the data
comes through fine, it's constructor fires, and so does the
constructor
of the other class it imports. I spent most of yesterday trying
to
debug this and I'm turning to the list now. Here is the main app
MXML
(the segment of the component is above):
//snippet
<mx:Application
xmlns:mx="http://www.adobe.com/2006/mxml
<http://www.adobe.com/2006/mxml>
<http://www.adobe.com/2006/mxml <http://www.adobe.com/2006/mxml>
> " xmlns:c="components.*"
layout="absolute"
applicationComplete="init()" >
<mx:Script>
<![CDATA[
[Bindable]
public var fakeData:ArrayCollection;
private function init():void
{
fakeData = setFakeData();
}
private function setFakeData():void
{
fakeData.addItem({firstName:"David", lastName:"Branson"});
fakeData.addItem({firstName:"Nelson", lastName:"Davidson"});
fakeData.addItem({firstName:"Sally", lastName:""});
}
....etc etc.
then further down in the MXML is the component declaration:
<c:MyComponent dataProvider="{fakeData}" ..blah blah/>
What could be going on here? Thanks for any insights.
Jason Merrill
Bank of America
GT&O L&LD Solutions Design & Development
eTools & Multimedia
Bank of America Flash Platform Developer Community
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