I've been playing around with breaking down my application into
component and one thing has been giving me headache which is how to
correctly handle components inside a @For loop.
take for example a simple component that lets you display a person in
either short or full detail view. I would have an @DisplayPerson
component that takes a Person object as a parameter. There is a
property inside the Person object which reflects whether the person
should be shown in detailed or not and so I can easily use an @If with
condition="ognl:person.showDetail".
I then want to have a @DirectLink that calls a listener that will
change this property for example:
void myListener(Boolean value){
getPerson().setShowDetail(value);
}
This works great and provides really nice encapsulation since the
component itself handles the link to change the state of whether to
show the details or not and has to have no additional knowledge of the
outside world except the Person it needs to deal with.
Enter the @For problem:
When using the @DisplayPerson component inside a @For loop I get an
error when doing the getPerson() since the listener is involved
directly and apart from the iteration. I know several ways around
this. For example the @ActionListener would force a sort of rewind and
I would get the correct state (of course this is risky and deprecated
since the server side state might no longer reflect the state of the
page. I can emulate the same behavior in a safer way by wrapping
everything in a @Form and using @LinkSubmits in the @DisplayPerson
component. My problem with this approach is that it breaks the
encapsulation and just seems like it's confusing things since I'm not
actually using a form.
I'd like some ideas about a better way to do this. It'd be nice to
store the state of the @For loop server side in some automatic
fashion. Is this possible? If it is then I think it'd be possible to
have something like the @ActionLink component that could be made safe
rather than deprecated. Anybody have any ideas?
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