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Re: Components on a page question...
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Re: Components on a page question...


  • Subject: Re: Components on a page question...
  • From: James Cicenia <email@hidden>
  • Date: Mon, 29 Mar 2004 15:39:06 -0600

Jonathan -

These days I am working 10-12 hours a day every day.

Anyway... it turned out that my problem was stupid... my submit button was
the only thing wrapped in the form.


However, it has made me rethink my work... I have always subclassed my
pages from a the master Page and had put all my code in there. But now
you have me thinking that that would be inefficient just keeping the code within
the children only.. Well,, deadlines are looming so re-factoring will have to be
done for version 1.1.


-James Cicenia


On Mar 29, 2004, at 10:51 AM, Jonathan Rochkind wrote:

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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  • Follow-Ups:
    • Re: Components on a page question...
      • From: Jonathan Rochkind <email@hidden>
References: 
 >Components on a page question... (From: James Cicenia <email@hidden>)
 >Re: Components on a page question... (From: Jonathan Rochkind <email@hidden>)

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