On Mon, 8 Jul 2002 [EMAIL PROTECTED] wrote:
> Date: Mon, 8 Jul 2002 16:06:26 -0400
> From: [EMAIL PROTECTED]
> Reply-To: Struts Users Mailing List <[EMAIL PROTECTED]>
> To: Struts Users Mailing List <[EMAIL PROTECTED]>
> Subject: Re: DynaActionForm Advantages
>
>
>
> > The benefit of using DynaActionForm instead is in one of the following
> two
> > use cases:
> >
> > * If your ActionForm bean doesn't have a custom reset() or validate()
> > method, you don't need to write your own form bean class at all -
> > simply configure the properties in struts-config.xml.
> >
> > * If your ActionForm bean does have a custom reset() or validate()
> method,
> > those are the only ones you have to write -- no more time wasted with
> > all the property getter and setter methods (have you ever done anything
> more
> > boring that writing those?). Simply subclass DynaActionForm and
> > implement the validate() method in the usual way (although it will
> > have to use get() to get the values to be tested, instead of the
> > usual property getter methods).
> >
> > Given how many situations are covered by one or the other of the above,
> > I'd say DynaActionForm is modestly useful :-). But, like most things,
> > it's just an option.
> >
> > Craig
> >
>
> So why would anyone ever NOT use DynaBeans?
>
Possible reasons why not:
* You're currently still stuck with Struts 1.0.2 :-).
* Non-trivial getter and setter implementations that do more than just
manipulate an instance variable.
* Required code in the no-args constructor (although in most cases you can
get around this by doing initialization in the reset() method instead.
An additional reason to consider them was added in a recent nightly build
-- you can now conveniently initialize arrays of constants in your
struts-config.xml file, which is very convenient for setting up standard
options for an <html:select>, or the default set of values for an
<html:multibox>. Example:
<form-bean name="foo" type="org.apache.struts.action.DynaActionForm">
...
<form-property name="optionsList" type="java.lang.String[]"
initial="{ 'First option', 'Second option', 'Third option' }"/>
...
</form-bean>
The syntax for initializing an array is basically like what you'd use to
initialize them in a variable declaration, except you can only use
constants.
Craig
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