Almong,
I don't see any problem with #5. The getTabsLabels() should contain a
simple null check, so it will only perform an action when your
serviceList object is populated.
Client-side manipulation of the serviceList object should take place
within the result method of the command retrieving the list.
I'm not sure what you mean when you state "but it shouldn't be there
as it won't be readable". Can you clarify your concerns with this
approach?
-Nick Matelli
Amentra, Inc
--- In flexcoders@yahoogroups.com, "mydarkspoon" <[EMAIL PROTECTED]> wrote:
>
> Hello all,
>
> I'm new with Cairngorm, trying to develop a wizard RIA with flex, and
> I encountered an issue with data binding that went ugly:
> In my model I have an XML doc taht describes several available search
> services from the server. This XML is retrieved when the app start by
> using an appropriate command that uses business delegate.
>
> However, in the view I have a TabBar, that needs to manipulate the XML
> config file from the model, meaning that it has to know when this xml
> is retrieved.
> I found few approaches to this:
>
> 1. use a fake getter-setter binded to the model. My drawback from this
> approach is quite obvious, I don't really need a getter here, but a
> notification...
> 2. custom [Bindable(event="....")]. This also not the best way as it
> introduces new complexity to the model and enforces the developer to
> dispatch an event...
>
> 3. Using a command to create the data for the TabBar in the view. I
> think this creates a tightly coupled connection between the controller
> and the view...
>
> 4. Using Paul Williams <ac:ObserveValue /> util. Although one might
> think this creates a slick binding to function by hiding the fake
> getter-setter, it actually dispatches redundant events because it
> handler can't be compared to the source property, and thus the handler
> is being called even when the source is null.
>
> 5. using curly braces:
> <mx:TabBar dataProvider={getTabsLabels(_model.servicesList)} />
> This approach also introduces redundant events as its destination is
> not read-write enabled and it will get dispatched even when the
> servicesList is null.
> Moreover, I want to executes one more manipulation on the xml from the
> model, it can be created while calling the getTabsLabels() but it
> shouldn't be there as it won't be readable...
>
>
> I'll be more than happy to hear your ideas.
>
> Thanks a lot !
>
> Almog Kurtser.
>
