// Show button on scroll
window.onscroll = function() { toggle_gototop() };

function toggle_gototop() {
  gototop_button = document.getElementById("gototop");
  if (document.body.scrollTop > 20 || document.documentElement.scrollTop > 20) {
    gototop_button.style.display = "block";
  } else {
    gototop_button.style.display = "none";
  }
}

function gototop() {
  document.body.scrollTop = 0; // For Safari
  document.documentElement.scrollTop = 0; // For Chrome, Firefox, IE and Opera
}

document.addEventListener('DOMContentLoaded', function() {
  const $navbarBurgers = Array.prototype.slice.call(document.querySelectorAll('.navbar-burger'), 0);
  if ($navbarBurgers.length > 0) {
    $navbarBurgers.forEach(function(el) {
      el.addEventListener('click', function() {
        const target = el.dataset.target;
        const $target = document.getElementById(target);
        el.classList.toggle('is-active');
        $target.classList.toggle('is-active');
      });
    });
  }
});