Thank that helps.
The component usually deals with how to render/display model data.
Thus not the component is the right place to keep the city and
detailed weather data, rather an appropriate model object.
My dream solution would be if I could create the Panel instance in the
Session and reuse the same instance on different Pages. However I think
this is not possible, is it?
I don't think this is suitable approach. See below for more details
I still think this would be the most 'natural' approach for components
which do not depend on a specific Page. You could also attach a Model to
them and I guess it would save resources to have just one shared instance.
However I see that this falls out of the straight easy way of Wicket (for
which I like Wicket).
My next solution is to declare a shared model holding the selected town.
That's how I would do it
custom session: yes, very easy in Wicket. Just subclass it and provide
your type safe getter and setter. However, you are right, you can
simply plug and play the component. A pnp component would have to use
a non-type safe approach. IMO it isn't that worse, because it would
all be encpasulated in a single (your) component and the app-author
wouldn't have to be concerned at all.
you are free to develop a nameing convention to store and access
information in wickets session object and thus to prevent accidental
changes. We currently do nt provide it (as far as I know).
So I'd have a (public) method saveModel(String someKey, IModel model) on
the Session and override detacheModel() on the Panels. Is detacheModel()
only called when the whole Session is transferred? I do not have a use
case but just for curiosity how would you handle the case where there is
an instance specific model and a shared model?
--
Christian Essl
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