How to hide navbar-collapse when clicking menu item in mobile version?

Question

css

I'm studying. Here is the site . In the mobile version, when you click on a menu item, it does not collapse. The question is why? Thank you!

Answer 1

jsfiddle.net/s9ktyqau/1

Answer 2

$(window).on('click', '.propClone a', function() {
$(this).parents('.navbar-collapse').addClass('collapse')
});