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Posted to user@commons.apache.org by "Jens v.P." <de...@jevopi.de> on 2003/07/24 16:09:21 UTC
validator - "split" resources and make it more dynamical
Hi,
I want to extend the validator framework but I'm not sure if my concept
is working or not :)
The validator framework is great for static forms, such as html-forms
and all that stuff used by struts. A common question in the struts user
mailing list is how to make the validator a little bit more
"dynamically". There are dynamic aspects:
1) Generate or define formsets on the fly
2) Modify formsets between two "page" impressions
As far as I've understood the design and code of the validator, it's
possible to add FormSets on the fly - how these new FormSets are
created is a problem left to me (e.g. copy and paste the
FormSet-reading commands for the digester from the
ValidatorResourcesInitializer class).
The problem is that I didn't found a way to remove a FormSet from the
ValidatorResources. Is this possible? I guess the problem behind that
is that FormSets are assumed to be user independent, that is a FormSet
is created and user related data are validated, but the FormSet itsself
is not modified - it's immutable. In some cases immutable FormSets have
to be removed, e.g. if too many FormSets can be created. In other
cases, even worst, FormSets can become user dependent, e.g. if a
FormSets represents a protocol (such as: what have you eaten today -
and the user can add an undefined amount of answers). In this case a
FormSet and its definition must be separated from the definitions of
the validator beans.
I like the validator framework for validating the forms, and adding
JavaScript is a great functionality. Now I try to extend the framework,
but I'm not sure if it's possible.
E.g. I'm thinking of separating the validation.xml related stuff from
the validation-rules.xml stuff (not only separate files but also two or
more ValidatorResources which are to be chained or something).
Additionally I need some more configurations, such as filters (if a
user has got no car, you don't have to ask what type of car he owns)
and evaluation beans (reading the properties aka answers and evaluating
another property, e.g. asking for width, height and depth of something
and "evaluate" the volume).
Does somebody has any experiences on that topic?
Jens