Get tax.

gistfile1.rb

#view
= select_tag "paisorigen", id: "country", "<option  value=':PEN' >Perú</option> <option    value=':COP'>Colombia</option><option value=':MXN'>Mexico</option><option value=':USD'>Otros</option>".html_safe, :include_blank => true, :class => "chosen required",  :style => "padding: 8px 0px 0px 5px;width: 120px;margin: 18px 0px 4px 15px;", :required => "required "

#javascript  
$(document).on 'change','select#country',(event) ->
  target = $('#donde_se_va_mostrar')    
  country_code = $(@).val()    
  url = "/my_controller/my_method?country_code=#{country_code}"
  target.load(url)

#controller my_controller
def my_method
  @typechange = Tax.typechange(params[:country_code])
  render partial: 'tax'
end

#view partial _taxt.html.haml
%label= @tyepchange

#routes
get :my_method