module ElementHelpers
  class Element
    def initialize(context, selector)
      @context, @selector = context, selector
    end
    
    def hide!
      call(:hide)
    end
    
    def show!
      call(:show)
    end
    
    def visible?
      call(:is, ':visible') == 'true'
    end
    
    private
    
    def call(fn, *args)
      @context.run_javascript <<-JS
        return jQuery(#{@selector.inspect})[#{fn.to_s.inspect}](#{args.map(&:inspect).join(', ')});
      JS
    end
  end
  
  def locate(selector)
    Element.new(self, selector)
  end
end