Rails - Dec 2008 - Override helper (observe_field) and put JS at the bottom

Is it possible to override a helper function and put its javascripts at
the bottom (using yield)?

I tried the follows in helper:
<code>
  # override observe field to put js at the bottom
  def observe_field(field_id, options = {})
    if @layout_options
      content_for :after_js do
        super(field_id, options )
      end
    else
      super
    end
  end

</code>

In view

<code>
<%=yield :after_js%>
</code>

But it seems not working.
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Arthur Chan wrote:
> Is it possible to override a helper function and put its javascripts at
> the bottom (using yield)?
> 
> I tried the follows in helper:
> <code>
>   # override observe field to put js at the bottom
>   def observe_field(field_id, options = {})
>     if @layout_options
>       content_for :after_js do
>         super(field_id, options )
>       end
>     else
>       super
>     end
>   end
> 
> </code>
> 
> In view
> 
> <code>
> <%=yield :after_js%>
> </code>
> 
> But it seems not working.
Oops, I found the problem. I should not return anything when I put 
things into content_for, so

<code>
  def observe_field(field_id, options = {})
    #super
    #return
    if @layout_options
      content_for :after_js_ready do
        super(field_id, options )
      end
      return "" # ****** don''t return immediate results****
    else
      super
    end
  end
</code>


Cool! I am getting A in yslow now :D


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