Re: Components on a page question...
Re: Components on a page question...
- Subject: Re: Components on a page question...
- From: Jonathan Rochkind <email@hidden>
- Date: Mon, 29 Mar 2004 10:51:22 -0600
At 10:05 AM -0600 3/27/04, James Cicenia wrote:
Hello -
I have a WebObjects page that I built with multiple components
so that WOBuilder would have an easier time.
Say I have a Page with 3 components nested in it..
Page
Page1
Page2
Page3
I subclassed Page1, Page2, Page3 from Page.
Okay, to begin with this is an unusual design.
All my objects, initializations
are in Page. When it builds the page will Page1,2&3 void out my objects?
You're getting confused. Page1, Page2, Page3 and Page are all
distinct seperate objects. The fact that all the subcompobnents
subclass Page doesn't change anything; you still have four different
objects here. They do not share any state. Each has it's own copies
of all iVars. If you want these components to share state, you need
to pass objects from Page into the sub-components via bindings. And
it probably isn't neccesary and is probably not a good idea to have
these subcomponents sub-class the Page class---at least if the only
reason you were doing that was to try and get them to share state,
which that won't accomplish anyway.
If you already do have bindings, let us know what they are. The
bindings could be implicated in your values changing when you don't
expect them to also. The default WO framework method of binding
synchronization sends values _both_ from parent to child _and_ back
out from child to parent. If the child changes the value of a
variable that has the same name as a binding, this value may be sent
back out to the parent, replacing the parent's original value. If
that's what's going on and it's undesirable, the solution is usually
handling binding value setting and getting yourself, instead of
letting the framework do it for you. See the
synchronizesVariablesWithBindings method.
Forgive me if I'm misunderstanding your question or your perspective.
I hope this helps.
--Jonathan
It seems they are. Originally I had passed the item into Page from a previous
page and everything displays properly... but when I try to save any changes
nothing is changed.
How do the pros handle this pattern?
-James Cicenia
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