wagtail_bakerydemo/bakerydemo/static/js/main.js

document.addEventListener('DOMContentLoaded', () => {
  const navigation = document.querySelector('[data-navigation]');
  const mobileNavigation = navigation.querySelector('[data-mobile-navigation]');
  const body = document.querySelector('body');
  const mobileNavigationToggle = navigation.querySelector(
    '[data-mobile-navigation-toggle]',
  );

  function toggleMobileNavigation() {
    if (mobileNavigation.hidden) {
      body.classList.add('no-scroll');
      mobileNavigation.hidden = false;
      mobileNavigationToggle.setAttribute('aria-expanded', 'true');
    } else {
      body.classList.remove('no-scroll');
      mobileNavigation.hidden = true;
      mobileNavigationToggle.setAttribute('aria-expanded', 'false');
    }
  }

  mobileNavigationToggle.addEventListener('click', () => {
    toggleMobileNavigation();
  });
});