Thanks for the quick reply Julian. I will provide more detail here.
I have two tables: roles and permissions with a
"has_and_belongs_to_many"
relationship between each other.
In the edit action for role, I initialize role and permissions like
this:
@role = Role.find(@params[:id])
@permissions = Permission.find
all,
rder => "title")
In the model I have two lists: one with all the available permissions
and
another with the permissions that a specific role has and buttons that
move
stuff from one list to the other using javascript.
The rhtml code for the lists goes like this:
<select id="available_permissions" name="available_permissions" multiple
size="10">
<% available_permissions = @permissions - @role.permissions %>
<%= options_for_select (available_permissions.collect { |p| [p.title,
p.id]}) %>
</select>
<select id="role_permissions" name="role[permissions][]" multiple =
"multiple" size="10">
<%= options_from_collection_for_select(@role.permissions, "id",
"title")
%>
</select>
I have two buttons invoke a javascript method to remove an item from one
list and add it to the other list. It goes like this:
function moveSelected(orig, dest)
{
var selectOrig = document.getElementById(orig);
var selectDest = document.getElementById(dest);
var i = 0;
while (i<selectOrig.length)
{
option = selectOrig.options
;
if (option.selected)
{
option.selected = false;
selectOrig.remove(i);
if (nn6)
{
selectDest.length = selectDest.length+1;
selectDest.options[selectDest.length-1] = option;
}
else selectDest.add(option);
}
else i++;
}
}
This part works well with records that I added manually to the
permissions_roles intermediate table. Nevertheless the simple
if @role.update_attributes(@params[:role]) ...
is not intelligent enough to populate role.permissions and update the
tables
in the database. That is fine, as long as I can access the select
options
from the controller, but whatever name I put in params doesn't seem to
work.
The hash returned by @params[:role] or @params["role"] doesn't include
"permissions" (i.e. @params[:role]["permissions"] is nil). Changing the
name
to something else like id = "assocperms" name = "assocperms[]" doesn't
help
as @params["assocperms"] also is nil (and so is @params["assocperms []"],
etc.). Also removing the "[]" from the name didn't do the trick. Is my
only
alternative to wrap up the select list in a div, send it via a
form_remote_tag, and parse it manually? The must be a more elegant
solution.
If anyone can provide insight on how I can tackle this problem it will
be
greatly appreciated!
Andres
Hi.
I wonder if there's a rails list...
Can you be more specific?
So you've got your helper code down to create HTML select, that's
cool...
but what do you mean by "use modifies the options via javascript" -
how?
Julian.
On 08/08/2005, at 12:01 PM, Andres Montano wrote:
Does anybody know if the options for a select in a form are accesible
via
@params?
I have an application that succesfully builds the select html
statements
but
then the user modifies the options via javascript. When the form gets
posted, is there a way to know what options are there, which are
selected,
etc from the controller?
I have tried all sorts of strategies like adding the [] to the name
of
the
select tag, but however I name it, param always returns nil.
Thanks,
Andres
