From: Bob Showalter <showaltb@...>
Date: 2007-06-29T07:02:23+09:00
Subject: Re: accessing the value chosen in a dropdown menu

On 6/28/07, James <jamaher@gmail.com> wrote:
> I have an array of frame colors called @frame_color and I created a
> dropdown menu that triggers a remote_function when the value is changed.
> The problem is that I can't seem to figure out how to pass the value of
> the selected string from the dropdown menu.
>
> this is the code I have:
>
> <%= select_tag(:frame_color, options_for_select(@frame_color), :onchange
> => remote_function(:update => "middle_sub_right", :url => {:action =>
> 'print_change', :color => params[:frame_color], :id => @prints, :photo
> => @photo}))%>

(You should be asking on the Rails list. Rails != Ruby)

Anyway, that won't work, because params[:frame_color] is being
evaluated as the view is being rendered.

Use observe_field() for this; it handles passing the value to the
remote function for you.

http://api.rubyonrails.org/classes/ActionView/Helpers/PrototypeHelper.html#M000535