<%= observe_field :country, :update => 'state-list', :url => admin_states_path, :before => "Element.hide('state-list');Element.show('busy_indicator')", :complete => "Element.hide('busy_indicator');Element.show('state-list')", :method => :get, :with => "'country_id='+encodeURIComponent(value)", :update => 'state-list' %> <%= image_tag "spinner.gif", :plugin=>"spree", :style => "display:none", :id => 'busy_indicator' %>