As flex beginner I was just learning how tree component is working and noticed this strange behavior.
Hal and your answer now make things more clear for me and give me more insight. Thanks both of you.
Milan
On another note, you're correct that flex does add the uids, and my solution was just to get the sample working so that the poster could see it properly.
For you, and the original poster this is not best practice, be aware that the actual problem is that the items added to the bottom list were a reference
to the item in the tree instead of a copy or new item, so the uid was not reset for the added item, this caused a double reference. A better solution for the sample would be changing
this line
listDP.addItem(prodTree.selectedItem);
to this
listDP.addItem(prodTree.selectedItem.copy());
I really did not think too much about it when I gave a quick solution. For the original poster Hal is correct in that you don't need to do this unless you need an "exact copy". It worked because you changed the item being added and flex did in that case change the uid. You should not add the uid yourself as an attribute unless you require it elsewhere.
The problem is not really a bug, the problem was references, and pointers getting out of wack and flex does not like that :)
Milan if you require a clearer explanation then feel free to ask. I hope this clears it up a bit better for you.
As for the sample I think it should be changed as it obviously can cause confusion for people.
Sorry for the confusion.
Jason
-----Message d'origine-----
De : [email protected] [mailto: [email protected]]De la part de milan kosirEnvoyé : vendredi 7 juillet 2006 22:46Sorry, but this is not true. I've seen this typo immediately, because withouth this question mark flex builder does not color code. But the problem I described remain. If Flex should generate UIDs, please take a look at example and find out what is wrong with it. I don't have enought insight and experience to find a problem, but I can say that jasons code works fine.
Thanks.
Best regards,
Milan
On 7/7/06, hal_lichtin <[EMAIL PROTECTED] > wrote:There is a bug in the example, but it is a one-character typo and does
not require you to modify the doTreeSelect() method. Simply add a
question mark as the next to the last character of the first line of
the code, so it reads as follows:
<?xml version="1.0"?>
You should not have problems compiling or running the application then.
Flex automatically generates UIDs for XMLListCollection objects and
you should not need do this yourself.
Hal Lichtin
Senior Technical Writer
Adobe Systems
[EMAIL PROTECTED]
--- In [email protected], "milan kosir" <[EMAIL PROTECTED]> wrote:
>
> Yes, it works fine. Thanks!
> Milan
>> On 6/30/06, milan kosir <[EMAIL PROTECTED]> wrote:
> >
> > Thank you very much, Jason,
> > I can't test it before tomorow, but I'm already happy :)
> >
> >
> > Milan
> >> > On 6/30/06, Jason Hawryluk < [EMAIL PROTECTED]> wrote:
> > >
> > > That sample is buggy
> > >
> > >
> > > replace the below code
> > >
> > > private function doTreeSelect():void
> > > {
> > > if (prodTree.selectedItem)
> > > listDP.addItem(prodTree.selectedItem);
> > > }
> > >
> > > with the below
> > >
> > > import mx.utils.UIDUtil;
> > > private function doTreeSelect():void
> > > {
> > > if (prodTree.selectedItem)
> > > var newnode:Object = prodTree.selectedItem.copy();
> > >
> > > [EMAIL PROTECTED] =
mx.utils.UIDUtil.createUID().toString();
> > >
> > >
> > > listDP.addItem(newnode);
> > > }
> > >
> > > and it works as it should
> > >
> > > Jason
> > >
> > >
> > >
> > > -----Message d'origine-----
> > > *De :* [email protected] [mailto:
[email protected]]*De
> > > la part de* milan kosir
> > > *Envoyé :* vendredi 30 juin 2006 15:26
> > > *À :* [email protected]
> > > *Objet :* Re: [flexcoders] Using the XMLListCollection class bug
> > >
> > > Thank you, Jason,
> > > this is a great news!
> > >
> > > As I said, maybe it is a bad example, or maybe I just don't know
how to
> > > use it?
> > > Because when I add some "bananas" to the list, first they are not
> > > selectable except the last one,
> > > then when they are removed, they are not properly removed from
the tree,
> > > and on the end the tree can't render anymore.
> > > I'm interesting in this because I'd like to write a "lazy tree",
to get
> > > child items from database when they are needed (when the node is
opened).
> > > If anybody has done this and could give me a hint, I'd be gratefull.
> > >
> > > Thanks, Milan
> > >> > > On 6/30/06, Jason Hawryluk < [EMAIL PROTECTED]> wrote:
> > > >
> > > > I'm very happy to report that the tree component is working
very
> > > > well. All the outstanding bugs I've checked have been
corrected (i have a
> > > > few left to look into). The binding is working.
> > > >
> > > > jason
> > > >
> > > >
> > > > -----Message d'origine-----
> > > > *De :* [email protected] [mailto:
[email protected]]
> > > > *De la part de* kosir.milan
> > > > *Envoyé :* vendredi 30 juin 2006 12:03
> > > > *À :* [email protected]
> > > > *Objet :* [flexcoders] Using the XMLListCollection class bug
> > > >
> > > > Hi,
> > > > I'd like to report that example in chapter "Using the
> > > > XMLListCollection class"
> > > > (http://livedocs.macromedia.com/flex/2/docs/00000513.html#406668 )
> > > > which can be found under (Flex 2 Developer's Guide > Building User
> > > > Interfaces for Flex Applications > Using Data Providers and
> > > > Collections > Using hierarchical data providers) does not work as
> > > > expected and produces very strange results.
> > > > Could somebody confirm that f2b3 bug in tree dataproviders is
removed
> > > > or not? Maybe there is problem only with example.
> > > > I'd really like to know if Flex 2 allow to make dynamic
databinding
> > > > for Tree component. Any hint or working example would be highly
> > > > appreciated.
> > > > Milan
> > > >
> > > >
> > >
> > >
> >
> >
>
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