Tom,
First, thanks to you and all(Eric, Doug, Bidhu) who responded with useful
advice
to my question.
Yes, unit_dp and division_dp were simply pointers to the same, filtered object.
I used a clone as you suggested and the application works fine now. The
modified
code is below.
import mx.utils.*;
private var cloneDept:ArrayCollection = new ArrayCollection();
private var cloneUnit:ArrayCollection = new ArrayCollection();
private function initApp():void {
var cloneDept:ArrayCollection = new
ArrayCollection(ObjectUtil.copy(Application.application.dept_dp.source) as
Array
);
var cloneUnit:ArrayCollection = new
ArrayCollection(ObjectUtil.copy(Application.application.unit_dp.source) as
Array
);
dept_dp = cloneDept;
}
I hope the code snippet helps someone else. I had to do some rummaging on the
Web to understand how cloning works in Actionscript.
I thought I knew enough Flex to decipher code after I completed the Flex 3
Bible, but I guess I still have to study Actionscript 3 Bible to know the
subtle
differences like when pass by reference and pass by value are done.
Coming from a C/C++ development background it is hard from me to realize that
division_dp = Application.application.division_dp is pass by reference. Now, I
wish I knew Java well which is quite similar to Flex.
Thanks for your advice and time.
________________________________
From: Tom McNeer <[email protected]>
To: [email protected]
Sent: Wed, August 18, 2010 9:22:07 AM
Subject: Re: [AFFUG Discuss] newbie question: making values persist after
windows are changed
Chris,
I may not have followed the flow of your application correctly, but if both
windows use the same dataProvider, then any filtering done in one place will
show up in another - because it is, after all, the same object. Creating
another
object = to the dataProvider will, as Doug notes, involve passing by reference
and so shouldn't solve your problem.
So unit_dp and division_dp are simply pointers to the same, filtered object.
Perhaps you could consider cloning your data as it arrives from the server (or
wherever it comes from). A clone of the data will be a completely separate
object, and thus not affected by the filtering of the first object. So you
might
create division_dp as a pointer to Application.application.division_dp, but
clone the application's dp, and use the clone as unit_dp.
I often do this when I need to use the same basic lookup data in different
parts
of my applications, with slight differences. For example, I might retrieve a
list of departments and use that list within an employee's edit screen. But I
might clone the list and add an entry for "New Department" to use in a
drop-down
choice elsewhere.
--
Thanks,
Tom
Tom McNeer
MediumCool
http://www.mediumcool.com
1735 Johnson Road NE
Atlanta, GA 30306
404.589.0560
-------------------------------------------------------------
To unsubscribe from this list, simply email the list with unsubscribe in the
subject line
For more info, see http://www.affug.com
Archive @ http://www.mail-archive.com/discussion%40affug.com/
List hosted by http://www.fusionlink.com
-------------------------------------------------------------
