How do you get the Ruby on Rails generated id of a form element for reference in JavaScript?

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I ended up creating a custom form builder to expose the property directly

class FormBuilder < ActionView::Helpers::FormBuilder
  def id_for(method, options={})
   InstanceTag.new( object_name, method, self, object ) \
               .id_for( options )               
  end
end

class InstanceTag < ActionView::Helpers::InstanceTag
  def id_for( options )
    add_default_name_and_id(options)
    options['id']
  end
end

Then set the default form builder 

ActionView::Base.default_form_builder = FormBuilder

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