startbootstrap-sb-admin/src/js/scripts.js

A free admin dashboard template based on Bootstrap 4, created by Start Bootstrap.

// 
// Scripts
// 

window.addEventListener('DOMContentLoaded', event => {

    // Toggle the side navigation
    const sidebarToggle = document.body.querySelector('#sidebarToggle');
    if (sidebarToggle) {
        // Uncomment Below to persist sidebar toggle between refreshes
        // if (localStorage.getItem('sb|sidebar-toggle') === 'true') {
        //     document.body.classList.toggle('sb-sidenav-toggled');
        // }
        sidebarToggle.addEventListener('click', event => {
            event.preventDefault();
            document.body.classList.toggle('sb-sidenav-toggled');
            localStorage.setItem('sb|sidebar-toggle', document.body.classList.contains('sb-sidenav-toggled'));
        });
    }

});