demarches-normaliennes/app/javascript/new_design/dropdown.js

import { delegate } from '@utils';

delegate('click', 'body', (event) => {
  if (!event.target.closest('.dropdown')) {
    [...document.querySelectorAll('.dropdown')].forEach((element) =>
      element.classList.remove('open', 'fade-in-down')
    );
  }
});

delegate('click', '.dropdown-button', (event) => {
  event.stopPropagation();
  const parent = event.target.closest('.dropdown-button').parentElement;
  if (parent.classList.contains('dropdown')) {
    parent.classList.toggle('open');
  }
});