smoothScrolling jquery for bootstrap

smoothScrolling.js

<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script>
        $(document).ready(function(){    
            // Add smooth scrolling to all links
            $("a.nav-link").on('click', function(event) {

                // Make sure this.hash has a value before overriding default behavior
                if (this.hash !== "") {
                    // Prevent default anchor click behavior
                    event.preventDefault();
                    $(".nav").find(".active").removeClass("active");
                    $(this).addClass("active");

                    // Store hash
                    var hash = this.hash;

                    // Using jQuery's animate() method to add smooth page scroll
                    // The optional number (800) specifies the number of milliseconds it takes to scroll to the specified area
                    $('html, body').animate({
                        scrollTop: $(hash).offset().top - 80
                    }, 100, function(){

                        // Add hash (#) to URL when done scrolling (default click behavior)
                        window.location.hash = hash;
                    });
                } // End if
            });

            // Detect id in url and scrolling
            if (location.hash) {
                $('nav li a[href^="' + location.hash + '"]').trigger('click');
            } else {
                $('nav li a[href^="#beranda"]').addClass('active');
            }
        });
    </script>