November 2002
Intermediate to advanced
464 pages
14h 34m
English
Content preview from Programming Jakarta Struts
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Using an ActionForm with the Validator
You can’t use the standard Struts
ActionForm
class with the Validator. Instead, you
need to use a subclass of the ActionForm class
that is specifically designed to work with the Validator framework.
There are two root subclasses to select from, depending on whether
you are planning to use dynamic ActionForms. Figure 11-1 shows the ActionForm and
its descendants, to help you visualize the hierarchy.
Figure 11-1. The ActionForm class hierarchy
If you are using dynamic ActionForms, you should
use the
DynaValidatorForm
branch of the hierarchy. If you are using standard
ActionForms, you can use the
ValidatorForm
or one of its descendants instead.
Tip
Whether you use dynamic or regular ActionForms,
the manner in which you configure the Validator is the same. Just be
sure that whichever ActionForm subclass you
choose, you configure the form-bean section of the
Struts configuration file using the fully qualified class name. See
Section 4.7.2.2 for more details.
Dynamic or standard is only the first decision that you have to make
when choosing the proper ActionForm subclass.
Notice that in both the dynamic and standard branch of the
ActionForm hierarchy in Figure 11-1, there are two versions of
ValidatorForm. The parent class is called
ValidatorForm, or
DynaValidatorForm for the dynamic branch.
Each of these has a subclass that contains the name ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.