anchor.diff:      $('.custom-word-checkbox').prop('checked', true);
       $customWordField.css("max-height", 60);
       $customWordField.css("opacity", 1);
  +    $customWordField.css("visibility", "visible");
       $customWordField[0].offsetHeight;
       $customWordField.removeClass('notransition');
     }
  
positive.code:   <% end %>
  
    <div class="actions">
      <%= f.label :player_id, "Player" %>
      <%= f.select :player_id, options_for_select(Player.all.map { |player| [player.name, player.id] }), :class => 'form-control' %>
  
      <%= f.label :custom_word, "Use own custom word?" %>
  
negative.code:     if ( $(this).is(":checked") )  {
        $customWordField.css("max-height", 60);
        $customWordField.css("opacity", 1);
        $customWordField.css("visibility", "visible");
      } else {
        $customWordField.css("max-height", 0);
        $customWordField.css("opacity", 0);
        $customWordField.css("visibility", "hidden");
      }
    });
  
  