check_box_tag call action on change (AJAX)

rubyonrails-talk
1

Hi all, I'm developing an application with Rails 3.0.9 and I have a checkbox and I want to call a function when it is checked/uchecked. I'm trying with: <%= check_box_tag "mylabel" t.to_s, false, { :onchange => remote_function( :url => { :action => 'update_preview', :id => t.to_s })} %>

in the "show" view and this in the controller

  def update_preview     puts "-> hey!!!"   end

But the update_preview isn't called Someone can help me to understand?

Thanks