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From "Taylor, Jason" <jtay...@cobaltgroup.com>
Subject RE: Newbie question about action forms
Date Mon, 23 Sep 2002 22:37:19 GMT
Cool.  I guess when I started with Struts I saw the ActionForms as
annoyances when the data is read-only and shared, but I've recently started
paying attention to DynaActionForm stuff and I'm thinking about refactoring
extensively to make DynaActionForm beans act as a sort of self-documenting
data exchange layer defined in the struts-config files.  I'm not sure if
it's viable for my app, but so far I'm psyched!

-JT

-----Original Message-----
From: Chappell, Simon P [mailto:Simon.Chappell@landsend.com]
Sent: Monday, September 23, 2002 11:45 AM
To: Struts Users Mailing List
Subject: RE: Newbie question about action forms


Good question. I'll tell you what we did on my most recent project and you
can decide if it counts as a good answer.

I take a 100% view (no pun intended) that the reason for existence of an
ActionForm is to be the communication channel between actions and pages. On
a submit, struts scrapes the form and loads the form with the values and
hands it off to the action. When an action returns, the form data is taken
and inserted into the page fields. Period. (Well, except for some
validation, but that's icing on the cake and not a huge factor in my
thinking about forms).

If you have data that is to be transfered from action to action and that has
no meaningful part in the view, then I would suggest that a form is not the
way that I would go at first blush. I would carefully consider, for small
amounts of data (very small!), that you may wish to store some info in the
session itself. We just did that on my most recent project. We had three
small objects and we stored them in the session, a user object, a station
object and a shipment object. This allowed our design to be much cleaner by
not passing around these objects from page to page and action to action.
Other approaches include persistence into a database or using a singleton
data object inside a servlet.

Hope this helps.

Simon

-----------------------------------------------------------------
Simon P. Chappell                     simon.chappell@landsend.com
Java Programming Specialist                      www.landsend.com
Lands' End, Inc.                                   (608) 935-4526


>-----Original Message-----
>From: Taylor, Jason [mailto:jtaylor@cobaltgroup.com]
>Sent: Monday, September 23, 2002 12:40 PM
>To: 'Struts Users Mailing List'
>Subject: RE: Newbie question about action forms
>
>
>Simon-- do you think you should use ActionForms to transfer 
>objects that are
>shared between actions and never changed on the front end?  I can see
>arguments either way, what's your opinion?
>
>-----Original Message-----
>From: Chappell, Simon P [mailto:Simon.Chappell@landsend.com]
>Sent: Monday, September 23, 2002 9:54 AM
>To: Struts Users Mailing List; Miguel Angel Medina Lopez
>Subject: RE: Newbie question about action forms
>
>
>The "Struts way" is to transfer data between pages and actions using an
>ActionForm object. This holds true for either direction. It is standard
>practice to transfer this data in an Action Form. Please refrain from
>putting data into the session as a transfer mechanism. Struts will
>automagically make the form data available in the page that 
>you call using
>the reverse of the magic that it used to extract form data 
>from your calling
>page.
>
>Simon
>
>-----------------------------------------------------------------
>Simon P. Chappell                     simon.chappell@landsend.com
>Java Programming Specialist                      www.landsend.com
>Lands' End, Inc.                                   (608) 935-4526
>
>
>>-----Original Message-----
>>From: Miguel Angel Medina Lopez [mailto:mamedina@logic-factory.com]
>>Sent: Monday, September 23, 2002 11:48 AM
>>To: Struts Users Mailing List
>>Subject: Newbie question about action forms
>>
>>
>>Hi all:
>>
>>In the Struts framewok information from the form to the 
>action class is
>>transfer through an ActionForm, but when I want to transfer 
>>information from
>>the Action to a new HTML (JSP) page, for example a list of 
>>products, What is
>>better? Use an action form or directly storing the list in the session
>>object with a particular key.
>>
>>Thanks.
>>
>>
>>--
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>>
>
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