ys says:

what i did was

1. add format.js in carts controller destroy method

2. add remote: true on empty button

3. create destroy.js.erb in views/carts with

   $('#cart').html("<%=j render @cart %>.hide('blind', 1000);

it works fine but seems not following given hint…

suke says:

Does the cart appear when you access the page at first?

or

Does the cart appear after you empty the cart and reload the page?

I think given hint helps this situation.