hugo-theme-introduction/assets/js/index.js

// Nav burger animation
document.addEventListener('DOMContentLoaded', function () {
  // Get all "navbar-burger" elements
  var $navbarBurgers = Array.prototype.slice.call(document.querySelectorAll('.navbar-burger'), 0);
  // Check if there are any navbar burgers
  if ($navbarBurgers.length > 0) {
    // Add a click event on each of them
    $navbarBurgers.forEach(function ($el) {
      $el.addEventListener('click', function () {
        // Get the target from the "data-target" attribute
        var target = $el.dataset.target;
        var $target = document.getElementById(target);
        // Toggle the class on both the "navbar-burger" and the "navbar-menu"
        $el.classList.toggle('is-active');
        $target.classList.toggle('is-active');
      });
    });
  }
});

// Bitty scrolling links script
$('a[href^="#"]').click(function(e) {
    e.preventDefault();
    $('html, body').animate({
        scrollTop: $(this.hash).offset().top
    }, 500);
    $("#nav-menu").removeClass("is-active");
    return true;
})

// Modal closer
$('.card').click(function () {
    $($(this).attr('data-target')).addClass('is-active');
    $("html").addClass("modal-open");
});
$('.modal-close').click(function () {
    $($(this).attr('data-target')).removeClass('is-active');
    $("html").removeClass("modal-open");
});
$(document).keypress(function(e) {
    if(e.which == 0) {
        $('.modal.is-active').removeClass('is-active');
        $("html").removeClass("modal-open");
    }
});