Rails - Feb 2009 - Observe Field Problem

Hi there!

I need to use observe field to change dynamically one select field based
on another select field:

here is the view:

<%= observe_field ''class'', :url => { :action =>
''update_list'' },
          :frequency => 0.25,
          :update => ''nickname'',
                      :with => ''tipid''
          %>

Class:<select name="<%= "#{name}[][#{name}_class]"
%>" id="class">
      <%= options_from_collection_for_select(Tiprod.find(:all),
"id","name", {:include_blank => true}) %>
      </select>
Name:<select name="<%= "#{name}[][#{name}_data]"
%>" id="nickname">
      <option></option>
                        </select>

here is the controller

def update_list
  @tipid = params[:tipid]
  @products = Specprod.find(:all, :conditions => [''tiprif LIKE
?'',
"%{@tipid}%"])
end

and here is the update_list.rhtml

<% for product in @products%>
  <option value="<%= product.id %>"><%=
product.name%></option>
<% end %>

inspired by:
http://nealenssle.com/blog/2007/04/12/how-to-dynamically-update-form-elements-in-rails-using-ajax/


Now, when i try to fire this application, the script doesn''t work, and
the JS console tell me "Element is null" .
Why?Where i was wrong?


thanks in advance for the help
-- 
Posted via http://www.ruby-forum.com/.

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On Feb 13, 11:39 pm, Enzo Rivello
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Hi there!
>
> I need to use observe field to change dynamically one select field based
> on another select field:
>
> here is the view:
>
> <%= observe_field ''class'', :url => { :action =>
''update_list'' },
>           :frequency => 0.25,
>           :update => ''nickname'',
>                       :with => ''tipid''
>           %>
>
> Class:<select name="<%= "#{name}[][#{name}_class]"
%>" id="class">
>       <%= options_from_collection_for_select(Tiprod.find(:all),
> "id","name", {:include_blank => true}) %>
>       </select>
> Name:<select name="<%= "#{name}[][#{name}_data]"
%>" id="nickname">
>       <option></option>
>                         </select>
>
> here is the controller
>
> def update_list
>   @tipid = params[:tipid]
>   @products = Specprod.find(:all, :conditions => [''tiprif LIKE
?'',
> "%{@tipid}%"])
> end
>
> and here is the update_list.rhtml
>
> <% for product in @products%>
>   <option value="<%= product.id %>"><%=
product.name%></option>
> <% end %>
>
> inspired
by:http://nealenssle.com/blog/2007/04/12/how-to-dynamically-update-form-...
>

The observe_field helper just produces some javascript that does stuff
to the element with id class

You''ve got the call to observe_field before your select element, ie
it''s trying to observe something that doesn''t exist yet.

Fred
> Now, when i try to fire this application, the script doesn''t work,
and
> the JS console tell me "Element is null" .
> Why?Where i was wrong?
>
> thanks in advance for the help
> --
> Posted viahttp://www.ruby-forum.com/.
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