dolibarr/htdocs/admin/tools/ui/js/documentation.js

// MENU
let navmenu = document.querySelector('.doc-sidebar nav ul');
let navmenulinks = navmenu.querySelectorAll('a.link-withsubmenu');
if(navmenulinks.length > 0) {
    navmenulinks.forEach(
        function (menulink) {
            menulink.addEventListener(
                'click', function (e) {
                    e.preventDefault();
                    if(menulink.parentNode.classList.contains('active')) {
                        menulink.parentNode.classList.remove('active');
                    } else {
                        menulink.parentNode.classList.add('active');
                    }
                }
            );
        }
    );
}

// VIEW SCROLL
window.onscroll = function () {
    showscroll()
};
function showscroll()
{
    var winScroll = document.body.scrollTop || document.documentElement.scrollTop;
    var height = document.documentElement.scrollHeight - document.documentElement.clientHeight;
    var scrolled = (winScroll / height) * 100;
    document.getElementById("documentation-scroll").style.width = scrolled + "%";
}