Rails - Dec 2007 - Population of drop down list contents from a prior drop down selection

Suppose you have two drop down selects that are related.  The contents
of both come from a database.You want the contents of the second one
to be dependent on the selection made in the first one, but don''t want
the user to have to hit SUBMIT to make the contents populate.  For
example, say the goal is to  implement a role based access framework
and the first drop down is the controllers available for a given
right.  Once the user selects a controller, you want the next drop
down populated with only the actions available for that controller.

I suppose that this is an AJAX thing, but wasn''t sure how to do it.

Any suggestions?

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the basic thing will be to place a form-submit in the onchange event of 
the selectbox.

if this calls an ajax or a full page reload is a question of taste. it 
would be faster, but is not absolutely necessary.
-- 
Posted via http://www.ruby-forum.com/.

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On Dec 17, 2007 1:06 PM, Crispy
<cris_paltenghe-/E1597aS9LQAvxtiuMwx3w@public.gmane.org>
wrote:
>
> Suppose you have two drop down selects that are related.  The contents
> of both come from a database.You want the contents of the second one
> to be dependent on the selection made in the first one, but don''t
want
> the user to have to hit SUBMIT to make the contents populate.  For
> example, say the goal is to  implement a role based access framework
> and the first drop down is the controllers available for a given
> right.  Once the user selects a controller, you want the next drop
> down populated with only the actions available for that controller.
>
> I suppose that this is an AJAX thing, but wasn''t sure how to do
it.
>
> Any suggestions?
RJS and partials.  Replace the second drop down with a new version
when the first drop down is changed.


-- 
Greg Donald
http://destiney.com/

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I should warn you to replace the CONTENT of the second one, not the actual
select box itself. I tried doing this in an app of mine and found out it
wasn''t putting it through in the submit.

On Dec 18, 2007 5:50 AM, Greg Donald
<gdonald-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> On Dec 17, 2007 1:06 PM, Crispy
<cris_paltenghe-/E1597aS9LQAvxtiuMwx3w@public.gmane.org> wrote:
> >
> > Suppose you have two drop down selects that are related.  The contents
> > of both come from a database.You want the contents of the second one
> > to be dependent on the selection made in the first one, but
don''t want
> > the user to have to hit SUBMIT to make the contents populate.  For
> > example, say the goal is to  implement a role based access framework
> > and the first drop down is the controllers available for a given
> > right.  Once the user selects a controller, you want the next drop
> > down populated with only the actions available for that controller.
> >
> > I suppose that this is an AJAX thing, but wasn''t sure how to
do it.
> >
> > Any suggestions?
>
> RJS and partials.  Replace the second drop down with a new version
> when the first drop down is changed.
>
>
> --
> Greg Donald
> http://destiney.com/
>
> >
>

-- 
Ryan Bigg
http://www.frozenplague.net

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