Rails - Mar 2005 - Ajax, validations and oh my god you inputted the wrong values.

First of; big thanks to the Sam and the rest for the javascript helper
methods and Prototype, works really well.

But one thing still puzzles my mediocre mind: How do I handle
validation errors smoothly when someone is posting from a
remote_form_tag?

Let''s say it looks like this:
# view
<%= form_remote_tag(
                    :url => { :controller => ''foo'',
:action =>
''create_with_ajax'' },
                    :update => ''content_element'',
                    ) %> 
[some input fields]
<%= end_form_tag %>

# controller
def create_with_ajax
  @foo = Foo.new(@params["foo"])
  if @foo.save?
    @foos = Foo.find_all
     render "bar/list_foos"
  else
    # validation failed, now what?
  end
end

I''m guessing I can''t redirect to a "standard create
view", since that
would destroy my errors? And rendering the errors in the
content_element isn''t particular nice, so I''m not quite sure
what to
do?
What I''m looking for is really a kind of "best practices"
when it
comes to validations and ajax powered forms.

-- johan

Johan --

I''m really bummed you haven''t gotten a better response here --
this
seems to be a key issue, and there are some *really* sharp people
working on this. I hope this problem gets some attention -- i have
struggled with it for a while, and haven''t got anything profound to
contribute, other than to kick this thread.

lee

On 3/24/05, Johan Sörensen
<johans-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> First of; big thanks to the Sam and the rest for the javascript helper
> methods and Prototype, works really well.
> 
> But one thing still puzzles my mediocre mind: How do I handle
> validation errors smoothly when someone is posting from a
> remote_form_tag?
> 
> Let''s say it looks like this:
> # view
> <%= form_remote_tag(
>                     :url => { :controller => ''foo'',
:action =>
> ''create_with_ajax'' },
>                     :update => ''content_element'',
>                     ) %>
> [some input fields]
> <%= end_form_tag %>
> 
> # controller
> def create_with_ajax
>   @foo = Foo.new(@params["foo"])
>   if @foo.save?
>     @foos = Foo.find_all
>      render "bar/list_foos"
>   else
>     # validation failed, now what?
>   end
> end
> 
> I''m guessing I can''t redirect to a "standard create
view", since that
> would destroy my errors? And rendering the errors in the
> content_element isn''t particular nice, so I''m not quite
sure what to
> do?
> What I''m looking for is really a kind of "best
practices" when it
> comes to validations and ajax powered forms.
> 
> -- johan
> _______________________________________________
> Rails mailing list
> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

I haven''t tried this, so please correct me if I''m off base,
but
couldn''t you put @errors into the flash, redirect to your standard
view, then pull @errors back out and deal with it there?

On 5/25/05, Lee Pope <leepope-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Johan --
> 
> I''m really bummed you haven''t gotten a better response
here -- this
> seems to be a key issue, and there are some *really* sharp people
> working on this. I hope this problem gets some attention -- i have
> struggled with it for a while, and haven''t got anything profound
to
> contribute, other than to kick this thread.
> 
> lee
> 
> On 3/24/05, Johan Sörensen
<johans-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > First of; big thanks to the Sam and the rest for the javascript helper
> > methods and Prototype, works really well.
> >
> > But one thing still puzzles my mediocre mind: How do I handle
> > validation errors smoothly when someone is posting from a
> > remote_form_tag?
> >
> > Let''s say it looks like this:
> > # view
> > <%= form_remote_tag(
> >                     :url => { :controller =>
''foo'', :action =>
> > ''create_with_ajax'' },
> >                     :update => ''content_element'',
> >                     ) %>
> > [some input fields]
> > <%= end_form_tag %>
> >
> > # controller
> > def create_with_ajax
> >   @foo = Foo.new(@params["foo"])
> >   if @foo.save?
> >     @foos = Foo.find_all
> >      render "bar/list_foos"
> >   else
> >     # validation failed, now what?
> >   end
> > end
> >
> > I''m guessing I can''t redirect to a "standard
create view", since that
> > would destroy my errors? And rendering the errors in the
> > content_element isn''t particular nice, so I''m not
quite sure what to
> > do?
> > What I''m looking for is really a kind of "best
practices" when it
> > comes to validations and ajax powered forms.
> >
> > -- johan
> > _______________________________________________
> > Rails mailing list
> > Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> > http://lists.rubyonrails.org/mailman/listinfo/rails
> >
> _______________________________________________
> Rails mailing list
> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
> 

-- 
Chris Boone

http://hypsometry.com/  :  website edification
http://uvlist.org/  :  free classifieds for the Upper Valley

On 5/25/05, Chris Boone
<hypsometry-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> I haven''t tried this, so please correct me if I''m off
base, but
> couldn''t you put @errors into the flash, redirect to your standard
> view, then pull @errors back out and deal with it there?
Another option would be to serialize the @errors into a JSON
construct, pass that to the ajax, and have it do something meaningful
with it.

The redirection method would be much simpler though. 

-- 
rick
http://techno-weenie.net