How to make notices pop up as jquery on Ruby on Rails 4

Question

I have a user controller with the following code.

  # POST /users
  def create
    @user = User.new(user_params)

    if @user.save
      redirect_to '/', notice: 'Thank you for signing up for Beta.'
    else
      redirect_to '/', notice: 'That was an invalid or duplicate email address. Please try again!'
    end
  end

How can I make these pop up with jquery?