Happy New Year everybody.
This issue is mostly due to the validation failure mechanism which passes flow
direct to the 'input' result without giving a chance to code the data retrieval
needed to get data for dropdowns, associated lists, etc etc which the view/JSP
will need.
Currently the assorted solutions to this all seem to be forcing round pegs into
square holes. For instance, I could make the 'input' result an action chain to
go onto another action which does the data reading. Or I could fetch the data
via an <s:action> or a taglib.
The S2 documentation says in various places things like:
"First, we need to change or query the application's state, and then we need to
present an updated view of the application. The Action class manages the
application's state, and the Result Type manages the view."
Three or four years ago, this issue with the view was discussed alot. There was
talk of mechanisms termed 'view-controllers' and concepts such as 'view logic'.
I'd love to see this accommodated for in S2.
There is a certain amount of coding I can do to achieve my goals in the Results,
but it may not be the best place for it - the name 'Result' implies more of a
link between the Action and the View, rather than a place for coding data
retrieval.
Essentially I think there is a strong call for a Class or chain of classes that
can be tied to each particular View, whether Tile, JSP, velocity or whatever.
This is obviously not what Results were designed for. I can do it currently but
the S2 config allows only one class per ResultType - so effectively I'd need one
ResultType per JSP, or some pattern for it.
The sort of operations I'm thinking of:
- retrieving lists, sometimes parameterized (e.g. a list of items allowed in a
particular category - requires the categoryId)
- caching lists (countries in ApplicationScope, personalized data in session
for example)
- localization of dropdown beans (i.e. country names)
Regards
Adam
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