What about the situation where one of the components on the Page is a
BookmarkeablePageLink and you need to pass it in some PageParameters? In
this case how do you load the page parameters from the model in a lazy
fashion? It doesn't appear to be possible since PageParameters does not
evaluate against a model, thus the values need to be supplied upfront, while
the page is being created...
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From: "Joel Halbert" <[EMAIL PROTECTED]>
Sent: Wednesday, May 14, 2008 12:57 PM
To: <users@wicket.apache.org>
Subject: Re: Processing a form before page components are created
I take your point, thanks for the pointer.
--------------------------------------------------
From: "Eelco Hillenius" <[EMAIL PROTECTED]>
Sent: Wednesday, May 14, 2008 1:31 AM
To: <users@wicket.apache.org>
Subject: Re: Processing a form before page components are created
The reason I want to do this is that my pages are stateless, and I want
to
process the submitted form before all the components on the page are
initialised, incase I need to load different data models, or redirect
the
request to another page, thus saving unnecessary database calls and
component initialisation.
At the moment what I am doing is processing the form by directly
reading
the page parameters in the constructor before I add any components to
the
page, and then redirecting the request or initializing the page as
appropriate (bypassing the use of Form.onSubmit).
If you make sure your models/ components work lazily you can avoid
database calls being done until the components are actually rendered.
Rendering is a separate phase executing after component construction
and form handling. And you can let your form just populate a simple
bean to avoid database access. I wouldn't worry about the creation of
a few components, and you can break of any time with a
RestartResponseException or set the next page (without breaking off
current processing) using setResponsePage.
Eelco
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