Rails - Oct 2005 - need help with observe_field

I''m trying to have a different image display on a page based on the
item
selected in a select pull-down menu.

collection_select(''game'', ''map_id'',
@themaps, :id, :name)

How do I get the index of @themaps that is selected?

Here''s what I have that doesn''t work:

<%= observe_field ''game_map_id'',
:update => :game,
:url => {:action => "newgame_select"},
:with => "''map_id=''+escape(value)" %>

<div id="newgame_select"></div>

in the gametype_controller.rb file:

def newgame_select
map_id = params[:map_id]
the_selection = @themaps[map_id]
end

I want to do something like this:

<img src=<%= @themaps[the_selection].imagepath %>

Will this work? Any ideas?

Thanks in advance,
-Matt


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Haazmatt <haazmatt-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
> <%= observe_field ''game_map_id'',
> :update => :game,
> :url => {:action => "newgame_select"},
> :with => "''map_id=''+escape(value)" %>
>
> <div id="newgame_select"></div>
I think you need to :update => "newgame_select" assuming
that''s the
div where you want to put the new image.
-- 
Doug Alcorn - http://lathi.net/RubyOnRailsDeveloper
doug-jGAhs73c5XxeoWH0uzbU5w@public.gmane.org