RE: [repost] Special view information -> ActionForm or request?

2003-09-18 Thread Robert Taylor
Ahh. For situations where you have something like

pageA > ProcessActionA > pageB ===> ProcessActionB

where pageA and pageB need 2 different forms.

Yes. You would have to "insert" a SetupActionB in the chain which
results in:

pageA > ProcessActionA > SetupActionB ===> pageB ===> ProcessActionB


Yes, SetupActionB would
have to know how to extract formA data from the request and populate formB.
But this sounds like a wizard style process where it might be better to use
a single form for the entire process.


I think this problem/solution has been hashed out on this list many times
and
the solution is subject to the complexity of the process.
This pattern just happens to work for me and keeps things clean and
separate.

robert


> -Original Message-
> From: Joe Germuska [mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 18, 2003 4:00 PM
> To: Struts Users Mailing List
> Subject: RE: [repost] Special view information -> ActionForm or request?
>
>
> >I have a dynamic form defined in my struts config file and
> >mapped to both SetupAction and ProcessAction. I don't have
> >to manually create the form because Struts does this for me.
> >Its actually very simple:
> >...
> >How is that clumsy? Am I missing something?
>
> What if the dispatch to the page preceding "ProcessAction" depends on
> the submission of some form other than the one you require to handle
> "SetupAction."  It seems that your solution only works if you don't
> need an ActionForm in SetupAction for anything except preparing the
> view.
>
> Joe
>
>
> --
> --
> Joe Germuska
> [EMAIL PROTECTED]
> http://blog.germuska.com
> "If nature worked that way, the universe would crash all the time."
>   --Jaron Lanier
>
> -
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
>


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RE: [repost] Special view information -> ActionForm or request?

2003-09-18 Thread Joe Germuska
I have a dynamic form defined in my struts config file and
mapped to both SetupAction and ProcessAction. I don't have
to manually create the form because Struts does this for me.
Its actually very simple:
...
How is that clumsy? Am I missing something?
What if the dispatch to the page preceding "ProcessAction" depends on 
the submission of some form other than the one you require to handle 
"SetupAction."  It seems that your solution only works if you don't 
need an ActionForm in SetupAction for anything except preparing the 
view.

Joe

--
--
Joe Germuska
[EMAIL PROTECTED]  
http://blog.germuska.com
"If nature worked that way, the universe would crash all the time." 
	--Jaron Lanier

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RE: [repost] Special view information -> ActionForm or request?

2003-09-18 Thread Robert Taylor
> I don't understand this approach.  If you need special info in
> the view you
> first call a SetupAction and then have that action forward to a
> ProcessAction?
Nope. SetupAction forwards to a page; not an action.

> Maybe it does work if
> the form bean is in session scope?
It works if your form bean is in request scope too. I rarely put my
form beans in session scope.

> Also, this sounds like action chaining
> to me, which is not considered a Struts best practice.
No again. This is not chaining actions. I think you misunderstood.
I go from a SetupAction to a page which renders the view. Then,
when a user submits the form for processing it goes to ProcessAction.
Both SetupAction and ProcessAction use the same form. When a validation
error occurs, then the user is forwarded to SetupAction. The form remains
in the request and any special data that needs to be retrieved is populated
in the form by SetupAction and forwarded to the page where the original user
input along with any validation errors are displayed.

robert

> -Original Message-
> From: Sgarlata Matt [mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 18, 2003 2:19 PM
> To: Struts Users Mailing List
> Subject: Re: [repost] Special view information -> ActionForm or request?
>
>
> - Original Message -
> From: "Robert Taylor" <[EMAIL PROTECTED]>
> To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
> Sent: Thursday, September 18, 2003 2:02 PM
> Subject: RE: [repost] Special view information -> ActionForm or request?
>
>
> > Sorry for jumping in, but I've been lurking on this thread
> > and I use this pattern quite frequently.
> >
> > SetupAction ===> page ===> ProcessAction ===> page
> >
> > I have a dynamic form defined in my struts config file and
> > mapped to both SetupAction and ProcessAction. I don't have
> > to manually create the form because Struts does this for me.
> > Its actually very simple:
> >
> > In SetupAction:
> >
> > ActionForward forward = mapping.findForward("success");
> > DynaBean input = (DynaBean)form;
> > // populate input
> > return forward
> >
> > Upon validation failure, my ProcessAction input attribute is set to the
> > action mapping for SetupAction. I can see how this could be
> seen as a bit
> > of a hack, but its just using the existing framework to meet my
> > requirements.
>
> I don't understand this approach.  If you need special info in
> the view you
> first call a SetupAction and then have that action forward to a
> ProcessAction?  I thought this wouldn't work because the form bean is
> recreated with each pass through the ActionServlet.  Maybe it does work if
> the form bean is in session scope?  Also, this sounds like action chaining
> to me, which is not considered a Struts best practice.
>
> > If the data to display is static I just place it in ServletContext
> > when the application starts up and there is no need to necessarily have
> > a SetupAction.
>
> I think this is a standard approach and that it is considered a
> Struts best
> practice.
>
> > Upon validation, you can simply forward directly to the input page.
> >
> >
> > How is that clumsy? Am I missing something?
> >
> > robert
>
>
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Re: [repost] Special view information -> ActionForm or request?

2003-09-18 Thread Sgarlata Matt
- Original Message - 
From: "Robert Taylor" <[EMAIL PROTECTED]>
To: "Struts Users Mailing List" <[EMAIL PROTECTED]>
Sent: Thursday, September 18, 2003 2:02 PM
Subject: RE: [repost] Special view information -> ActionForm or request?


> Sorry for jumping in, but I've been lurking on this thread
> and I use this pattern quite frequently.
>
> SetupAction ===> page ===> ProcessAction ===> page
>
> I have a dynamic form defined in my struts config file and
> mapped to both SetupAction and ProcessAction. I don't have
> to manually create the form because Struts does this for me.
> Its actually very simple:
>
> In SetupAction:
>
> ActionForward forward = mapping.findForward("success");
> DynaBean input = (DynaBean)form;
> // populate input
> return forward
>
> Upon validation failure, my ProcessAction input attribute is set to the
> action mapping for SetupAction. I can see how this could be seen as a bit
> of a hack, but its just using the existing framework to meet my
> requirements.

I don't understand this approach.  If you need special info in the view you
first call a SetupAction and then have that action forward to a
ProcessAction?  I thought this wouldn't work because the form bean is
recreated with each pass through the ActionServlet.  Maybe it does work if
the form bean is in session scope?  Also, this sounds like action chaining
to me, which is not considered a Struts best practice.

> If the data to display is static I just place it in ServletContext
> when the application starts up and there is no need to necessarily have
> a SetupAction.

I think this is a standard approach and that it is considered a Struts best
practice.

> Upon validation, you can simply forward directly to the input page.
>
>
> How is that clumsy? Am I missing something?
>
> robert


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Re: [repost] Special view information -> ActionForm or request?

2003-09-18 Thread Sgarlata Matt
- Original Message - 
From: "Mainguy, Mike" <[EMAIL PROTECTED]>
To: "'Struts Users Mailing List'" <[EMAIL PROTECTED]>
Sent: Thursday, September 18, 2003 1:44 PM
Subject: RE: [repost] Special view information -> ActionForm or request?


> As far as the forms are concerned, I whole-heartedly agree that the
current
> notion of populating the form "one the way" to getting mapped to the view
> seems pretty clumsy.  I would almost advocate having the forms to be
> "pulled" (as above) out of some persistant service thingy (highly
technical
> term).  Of course, it would then require that we have some sort of
populate
> or load method that will do something before we process anything.  It
seems
> also like a variation of how the dispatchaction works would be kinda cool.
> Allowing, either based on URL or some other request info, you to determine
> if you are doing a read or a write "before" you even get to the action
would
> be the better way to go.

This discussion is getting me to thinking that in addition to the notion of
an ActionForm we need a parallel formalized java bean that is in charge of
non-form information that a view needs.  Perhaps this object could be called
an ActionView.  This could be documented with types in the struts-config
file and would provide not only a convenient API for JSP developers but
would also improve the documentation of how data gets transferred from the
Java to JSP layer.

I can't decide if the ActionView should be populated before the execution of
an Action, after the execution of an Action, or during the execution of an
Action.  I guess the most flexible would be for it to be populated during
the execution of the Action.  The ActionView could be saved to the request
or session with a saveActionView() method.  To configure the behavior of the
saveActionView() method the  element in struts-config could be
extended with viewBeanName and viewBeanScope attributes which would mirror
the name and scope attributes for ActionForms.

Another random thought is that ActionView should probably be an interface so
an existing JavaBean can be used if desired.  If an existing JavaBean does
not exist, one could be configured similarly to DynaActionForms in struts
config in a  section that had syntax nearly identical to that of
.

> Of course, that's just my perspective, but, your notion of the clumsiness
of
> stuffing data into the form in the Action (especially after the request
data
> has already been stuffed in there once) struck a chord with me.

100% agree.  ActionForm feels like it is doing double-duty if you stuff
things like java.util.List into it.  ActionForm should really only have
boolean and String values since these are the only values that can be
automatically pulled from the request parameters.

> Evidently the development in struts is a little more active than I
thought,
> I may have to start pulling down snapshots...
>
> -Original Message-
> From: Joe Germuska [mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 18, 2003 1:29 PM
> To: Struts Users Mailing List
> Subject: RE: [repost] Special view information -> ActionForm or request?
>
>
> I don't have a very strong opinion, but for form *choices*, I've
> always preferred to put them into some page-accessible context before
> dispatching to a page.
>
> I wrote a class called DigestingPlugIn which was added to Struts
> after the 1.1 release which is designed to make it easy to put a menu
> like this into the application context so that it's always available
> to all your pages, even if they don't go through an action before
> display.  Of course, if the choices are dynamic and specific to the
> request or the session, this doesn't work, but for things like
> sharing a menu of states or countries, it works pretty well.  If you
> aren't comfortable using unreleased Struts code, you can get a
> library version of this class from http://demo.jgsullivan.com/struts/
>
> Another alternative for request/session-specific options would be to
> extend the OptionsCollection tag to be smarter about how it gets the
> collection for iteration -- this would allow you to route people
> directly to the JSP without needing to go through an action class.
>
> We've been having a vigorous discussion over the last couple of days
> about the best way to prefill form *values* in a pre-validation
> context, and to be honest, I feel like this is a use case which
> Struts doesn't address very well.  It feels clumsy to fool around
> with creating an ActionForm and populating it "on the way" to the
> view; should I just get over that?  Or is this something about Struts
> that deserves a closer look with an eye towards addressing the use
> case more directly?

RE: [repost] Special view information -> ActionForm or request?

2003-09-18 Thread Robert Taylor
Sorry for jumping in, but I've been lurking on this thread
and I use this pattern quite frequently.

SetupAction ===> page ===> ProcessAction ===> page

I have a dynamic form defined in my struts config file and
mapped to both SetupAction and ProcessAction. I don't have
to manually create the form because Struts does this for me.
Its actually very simple:

In SetupAction:

ActionForward forward = mapping.findForward("success");
DynaBean input = (DynaBean)form;
// populate input
return forward

Upon validation failure, my ProcessAction input attribute is set to the
action mapping for SetupAction. I can see how this could be seen as a bit
of a hack, but its just using the existing framework to meet my
requirements.


If the data to display is static I just place it in ServletContext
when the application starts up and there is no need to necessarily have
a SetupAction.

Upon validation, you can simply forward directly to the input page.


How is that clumsy? Am I missing something?

robert

> -Original Message-
> From: Mainguy, Mike [mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 18, 2003 1:44 PM
> To: 'Struts Users Mailing List'
> Subject: RE: [repost] Special view information -> ActionForm or request?
>
>
> As far as the forms are concerned, I whole-heartedly agree that
> the current
> notion of populating the form "one the way" to getting mapped to the view
> seems pretty clumsy.  I would almost advocate having the forms to be
> "pulled" (as above) out of some persistant service thingy (highly
> technical
> term).  Of course, it would then require that we have some sort
> of populate
> or load method that will do something before we process anything.
>  It seems
> also like a variation of how the dispatchaction works would be kinda cool.
> Allowing, either based on URL or some other request info, you to determine
> if you are doing a read or a write "before" you even get to the
> action would
> be the better way to go.
>
> Of course, that's just my perspective, but, your notion of the
> clumsiness of
> stuffing data into the form in the Action (especially after the
> request data
> has already been stuffed in there once) struck a chord with me.
>
> Evidently the development in struts is a little more active than
> I thought,
> I may have to start pulling down snapshots...
>
> -----Original Message-----
> From: Joe Germuska [mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 18, 2003 1:29 PM
> To: Struts Users Mailing List
> Subject: RE: [repost] Special view information -> ActionForm or request?
>
>
> I don't have a very strong opinion, but for form *choices*, I've
> always preferred to put them into some page-accessible context before
> dispatching to a page.
>
> I wrote a class called DigestingPlugIn which was added to Struts
> after the 1.1 release which is designed to make it easy to put a menu
> like this into the application context so that it's always available
> to all your pages, even if they don't go through an action before
> display.  Of course, if the choices are dynamic and specific to the
> request or the session, this doesn't work, but for things like
> sharing a menu of states or countries, it works pretty well.  If you
> aren't comfortable using unreleased Struts code, you can get a
> library version of this class from http://demo.jgsullivan.com/struts/
>
> Another alternative for request/session-specific options would be to
> extend the OptionsCollection tag to be smarter about how it gets the
> collection for iteration -- this would allow you to route people
> directly to the JSP without needing to go through an action class.
>
> We've been having a vigorous discussion over the last couple of days
> about the best way to prefill form *values* in a pre-validation
> context, and to be honest, I feel like this is a use case which
> Struts doesn't address very well.  It feels clumsy to fool around
> with creating an ActionForm and populating it "on the way" to the
> view; should I just get over that?  Or is this something about Struts
> that deserves a closer look with an eye towards addressing the use
> case more directly?  I've been meaning to search the archives to see
> what discussions have come up, but since I'm sending this message, I
> guess I'll just dump it out there and see what people think...
>
> Joe
>
>
>
>
> At 12:35 -0400 9/18/03, Mainguy, Mike wrote:
> >I also would like other's opinion on this.  Right now, use a service
> >locator style class to stuff all my lookup stuff into the request
> >object manually. I have, however, used collections in the formbeans for
>

RE: [repost] Special view information -> ActionForm or request?

2003-09-18 Thread Mainguy, Mike
As far as the forms are concerned, I whole-heartedly agree that the current
notion of populating the form "one the way" to getting mapped to the view
seems pretty clumsy.  I would almost advocate having the forms to be
"pulled" (as above) out of some persistant service thingy (highly technical
term).  Of course, it would then require that we have some sort of populate
or load method that will do something before we process anything.  It seems
also like a variation of how the dispatchaction works would be kinda cool.
Allowing, either based on URL or some other request info, you to determine
if you are doing a read or a write "before" you even get to the action would
be the better way to go.

Of course, that's just my perspective, but, your notion of the clumsiness of
stuffing data into the form in the Action (especially after the request data
has already been stuffed in there once) struck a chord with me.

Evidently the development in struts is a little more active than I thought,
I may have to start pulling down snapshots...

-Original Message-
From: Joe Germuska [mailto:[EMAIL PROTECTED] 
Sent: Thursday, September 18, 2003 1:29 PM
To: Struts Users Mailing List
Subject: RE: [repost] Special view information -> ActionForm or request?


I don't have a very strong opinion, but for form *choices*, I've 
always preferred to put them into some page-accessible context before 
dispatching to a page.

I wrote a class called DigestingPlugIn which was added to Struts 
after the 1.1 release which is designed to make it easy to put a menu 
like this into the application context so that it's always available 
to all your pages, even if they don't go through an action before 
display.  Of course, if the choices are dynamic and specific to the 
request or the session, this doesn't work, but for things like 
sharing a menu of states or countries, it works pretty well.  If you 
aren't comfortable using unreleased Struts code, you can get a 
library version of this class from http://demo.jgsullivan.com/struts/

Another alternative for request/session-specific options would be to 
extend the OptionsCollection tag to be smarter about how it gets the 
collection for iteration -- this would allow you to route people 
directly to the JSP without needing to go through an action class.

We've been having a vigorous discussion over the last couple of days 
about the best way to prefill form *values* in a pre-validation 
context, and to be honest, I feel like this is a use case which 
Struts doesn't address very well.  It feels clumsy to fool around 
with creating an ActionForm and populating it "on the way" to the 
view; should I just get over that?  Or is this something about Struts 
that deserves a closer look with an eye towards addressing the use 
case more directly?  I've been meaning to search the archives to see 
what discussions have come up, but since I'm sending this message, I 
guess I'll just dump it out there and see what people think...

Joe




At 12:35 -0400 9/18/03, Mainguy, Mike wrote:
>I also would like other's opinion on this.  Right now, use a service 
>locator style class to stuff all my lookup stuff into the request 
>object manually. I have, however, used collections in the formbeans for 
>this.  I can't, off the top of my head, think of any significant 
>advantages to using a form bean.  One disadvantage, however, is you can 
>only have 1 form bean per action, so lookups across multiple actions 
>will need to have duplicate code.
>
>
>-Original Message-
>From: Sgarlata Matt [mailto:[EMAIL PROTECTED]
>Sent: Thursday, September 18, 2003 10:15 AM
>To: Struts Users Mailing List
>Subject: [repost] Special view information -> ActionForm or request?
>
>
>Sorry for the repost.  Has this already been discussed?  I couldn't 
>find it in the archives.
>
>Original message:
>
>Sometimes views need special information to display correctly, like a 
>bean with the values needed to render a dropdown list.  Is it 
>considered a Struts best-practice to include this information in the 
>ActionForm or should the Action which prepares this information store 
>the information in the request instead?
>
>Thanks,
>
>Matt
>
>
>-
>To unsubscribe, e-mail: [EMAIL PROTECTED]
>For additional commands, e-mail: [EMAIL PROTECTED]
>
>
>This message and its contents (to include attachments) are the
>property of Kmart Corporation (Kmart) and may contain confidential 
>and proprietary information. You are hereby notified that any 
>disclosure, copying, or distribution of this message, or the taking 
>of any action based on information contained herein is strictly 
>prohibited. Unauthorized use of information c

RE: [repost] Special view information -> ActionForm or request?

2003-09-18 Thread Joe Germuska
I don't have a very strong opinion, but for form *choices*, I've 
always preferred to put them into some page-accessible context before 
dispatching to a page.

I wrote a class called DigestingPlugIn which was added to Struts 
after the 1.1 release which is designed to make it easy to put a menu 
like this into the application context so that it's always available 
to all your pages, even if they don't go through an action before 
display.  Of course, if the choices are dynamic and specific to the 
request or the session, this doesn't work, but for things like 
sharing a menu of states or countries, it works pretty well.  If you 
aren't comfortable using unreleased Struts code, you can get a 
library version of this class from http://demo.jgsullivan.com/struts/

Another alternative for request/session-specific options would be to 
extend the OptionsCollection tag to be smarter about how it gets the 
collection for iteration -- this would allow you to route people 
directly to the JSP without needing to go through an action class.

We've been having a vigorous discussion over the last couple of days 
about the best way to prefill form *values* in a pre-validation 
context, and to be honest, I feel like this is a use case which 
Struts doesn't address very well.  It feels clumsy to fool around 
with creating an ActionForm and populating it "on the way" to the 
view; should I just get over that?  Or is this something about Struts 
that deserves a closer look with an eye towards addressing the use 
case more directly?  I've been meaning to search the archives to see 
what discussions have come up, but since I'm sending this message, I 
guess I'll just dump it out there and see what people think...

Joe



At 12:35 -0400 9/18/03, Mainguy, Mike wrote:
I also would like other's opinion on this.  Right now, use a service locator
style class to stuff all my lookup stuff into the request object manually.
I have, however, used collections in the formbeans for this.  I can't, off
the top of my head, think of any significant advantages to using a form
bean.  One disadvantage, however, is you can only have 1 form bean per
action, so lookups across multiple actions will need to have duplicate code.
-Original Message-
From: Sgarlata Matt [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 18, 2003 10:15 AM
To: Struts Users Mailing List
Subject: [repost] Special view information -> ActionForm or request?
Sorry for the repost.  Has this already been discussed?  I couldn't find it
in the archives.
Original message:

Sometimes views need special information to display correctly, like a bean
with the values needed to render a dropdown list.  Is it considered a Struts
best-practice to include this information in the ActionForm or should the
Action which prepares this information store the information in the request
instead?
Thanks,

Matt

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--
--
Joe Germuska
[EMAIL PROTECTED]  
http://blog.germuska.com
"If nature worked that way, the universe would crash all the time." 
	--Jaron Lanier

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Re: [repost] Special view information -> ActionForm or request?

2003-09-18 Thread Sgarlata Matt
Good points.  Originally I was leaning towards including everything in my
form beans.  We are using nothing but dynamic form beans in my app, so using
this style the  section of your struts-config file essentially
becomes documentation for your JSP authors.  However, lately I've been
thinking it's better to store things in the request and your post gives some
good reasons for that.

I'm wondering how the best way to document this stuff for a JSP author would
be; javadoc doesn't apply here ;)  I will have to look into the service
locator pattern.  That could be of some help.

Thanks,

Matt
- Original Message - 
From: "Mainguy, Mike" <[EMAIL PROTECTED]>
To: "'Struts Users Mailing List'" <[EMAIL PROTECTED]>
Sent: Thursday, September 18, 2003 12:35 PM
Subject: RE: [repost] Special view information -> ActionForm or request?


> I also would like other's opinion on this.  Right now, use a service
locator
> style class to stuff all my lookup stuff into the request object manually.
> I have, however, used collections in the formbeans for this.  I can't, off
> the top of my head, think of any significant advantages to using a form
> bean.  One disadvantage, however, is you can only have 1 form bean per
> action, so lookups across multiple actions will need to have duplicate
code.
>
>
> -Original Message-
> From: Sgarlata Matt [mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 18, 2003 10:15 AM
> To: Struts Users Mailing List
> Subject: [repost] Special view information -> ActionForm or request?
>
>
> Sorry for the repost.  Has this already been discussed?  I couldn't find
it
> in the archives.
>
> Original message:
>
> Sometimes views need special information to display correctly, like a bean
> with the values needed to render a dropdown list.  Is it considered a
Struts
> best-practice to include this information in the ActionForm or should the
> Action which prepares this information store the information in the
request
> instead?
>
> Thanks,
>
> Matt
>
>
> -
> To unsubscribe, e-mail: [EMAIL PROTECTED]
> For additional commands, e-mail: [EMAIL PROTECTED]
>
>
> This message and its contents (to include attachments) are the property of
Kmart Corporation (Kmart) and may contain confidential and proprietary
information. You are hereby notified that any disclosure, copying, or
distribution of this message, or the taking of any action based on
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RE: [repost] Special view information -> ActionForm or request?

2003-09-18 Thread Mainguy, Mike
I also would like other's opinion on this.  Right now, use a service locator
style class to stuff all my lookup stuff into the request object manually.
I have, however, used collections in the formbeans for this.  I can't, off
the top of my head, think of any significant advantages to using a form
bean.  One disadvantage, however, is you can only have 1 form bean per
action, so lookups across multiple actions will need to have duplicate code.


-Original Message-
From: Sgarlata Matt [mailto:[EMAIL PROTECTED] 
Sent: Thursday, September 18, 2003 10:15 AM
To: Struts Users Mailing List
Subject: [repost] Special view information -> ActionForm or request?


Sorry for the repost.  Has this already been discussed?  I couldn't find it
in the archives.

Original message:

Sometimes views need special information to display correctly, like a bean
with the values needed to render a dropdown list.  Is it considered a Struts
best-practice to include this information in the ActionForm or should the
Action which prepares this information store the information in the request
instead?

Thanks,

Matt


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