Astro Hamburger Menu

hamburger.astro

---
import { siteName } from "~/config/config";

const links = [
  {
    text: 'Home',
    href: '/'
  },
  {
    text: 'About',
    href: '/'
  },
  {
    text: 'Contact us',
    href: '/'
  }
];
---

<nav class="nav" data-menu>
  <div class="nav-inner">
    <header class="header">
      <a class="title" href="/">{siteName}</a>
      <button class="nav-menu-handle" data-menu-handle aria-label="Toggle menu">
        <span class="nav-menu-icon">
          <span class="layer"></span>
          <span class="layer"></span>
          <span class="layer"></span>
          <span class="layer"></span>
        </span>
      </button>
    </header>
    <ul class="nav-menu-items">
      {
        links.map(({ text, href }) => (
          <li class="nav-menu-item">
            <a href={href}>{text}</a>
          </li>
        ))
      }
    </ul>
  </div>
</nav>

<style>
  .nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 0 0 0 var(--spacing-sm);
    background-color: var(--color-bg-dark);
    color: var(--color-text-body-on-dark);
  }

  .nav-inner {
    width: 100%;
    max-width: var(--dimension-max-content-width);
  }

  .header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0;
  }

  .title {
    font-size: var(--typography-h1-font-size);
    font-weight: 400;
    line-height: var(--typography-h1-line-height);
  }

  .menu-icon {
    width: 40px;
    height: 40px;
    color: #fff;
  }

  .nav-menu-handle {
    margin: 0;
    padding: var(--spacing-sm);
    border: 0;
    background-color: transparent;
    cursor: pointer;
  }
  
  .nav-menu-icon,
  .nav-menu-icon .layer {
    pointer-events: none;
  }
  
  .nav-menu-icon {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 25px;
    height: 25px;
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
    -webkit-transition: .5s ease-in-out;
    -moz-transition: .5s ease-in-out;
    -o-transition: .5s ease-in-out;
    transition: .5s ease-in-out;
  }

  .nav-menu-icon .layer {
    display: block;
    position: absolute;
    height: 4px;
    width: 100%;
    background: var(--color-text-body-on-dark);
    border-radius: 9px;
    opacity: 1;
    left: 0;
    -webkit-transform: rotate(0deg);
    -moz-transform: rotate(0deg);
    -o-transform: rotate(0deg);
    transform: rotate(0deg);
    -webkit-transition: .25s ease-in-out;
    -moz-transition: .25s ease-in-out;
    -o-transition: .25s ease-in-out;
    transition: .25s ease-in-out;
  }

  .nav-menu-icon .layer:nth-child(1) {
    top: 0px;
  }

  .nav-menu-icon .layer:nth-child(2),
  .nav-menu-icon .layer:nth-child(3) {
    top: 10px;
  }

  .nav-menu-icon .layer:nth-child(4) {
    top: 20px;
  }

  .nav[data-menu="true"] .nav-menu-icon .layer:nth-child(1) {
    top: 10px;
    width: 0%;
    left: 50%;
  }

  .nav[data-menu="true"] .nav-menu-icon .layer:nth-child(2) {
    -webkit-transform: rotate(45deg);
    -moz-transform: rotate(45deg);
    -o-transform: rotate(45deg);
    transform: rotate(45deg);
  }

  .nav[data-menu="true"] .nav-menu-icon .layer:nth-child(3) {
    -webkit-transform: rotate(-45deg);
    -moz-transform: rotate(-45deg);
    -o-transform: rotate(-45deg);
    transform: rotate(-45deg);
  }

  .nav[data-menu="true"] .nav-menu-icon .layer:nth-child(4) {
    top: 10px;
    width: 0%;
    left: 50%;
  }

  .nav-menu-items {
    display: none;
    list-style: none;
    padding: 0;
    margin: 0;
  }

  nav[data-menu="true"] .nav-menu-items {
    display: block;
  }

  .nav-menu-item a {
    display: block;
    padding: var(--spacing-sm) var(--spacing-sm) var(--spacing-sm) 0;
    color: var(--color-text-body-on-dark);
    text-decoration: none;
  }

  @media (--breakpoint-tablet) {
    .nav {
      padding: 0 var(--spacing-md);
    }
    
    .header {
      padding: 0;
    }

    .nav-inner {
      display: inline-flex;
      justify-content: space-between;
    }

    .nav-menu-items,
    nav[data-menu="true"] .nav-menu-items {
      display: inline-flex;
      list-style: none;
    }

    .nav-menu-item {
      margin-left: var(--spacing-md);
      padding: 0;
    }

    .nav-menu-icon {
      display: none;
    }
  }
</style>

<script>
  const menuAttribute = 'data-menu';
  const handleAttribute = 'data-menu-handle';

  const toggleOrSetMenuState = (state?: boolean) => {
    const menu = document.querySelector(`[${menuAttribute}]`);
    if (!menu) return console.error(` [${menuAttribute}] not found in document`);

    if (typeof state === 'boolean') {
      return menu.setAttribute(menuAttribute, String(state));
    }

    return menu.setAttribute(
      menuAttribute, String(menu.getAttribute(menuAttribute) === 'true' ? false : true)
    );
  }

  const handleMenuButtonClick = (event: MouseEvent) => {
    if ((event.target as HTMLElement).hasAttribute(handleAttribute)) {
      return toggleOrSetMenuState();
    }
  }

  const handleClickOutside = (event: MouseEvent) => {
    const menu = document.querySelector(`[${menuAttribute}]`);
    if (!menu) return console.error(`[${menuAttribute}] not found in document`);

    if (!(event.target instanceof Node)) return;

    if (!menu.contains(event.target) && menu.getAttribute(menuAttribute) === 'true') {
      return toggleOrSetMenuState(false);
    }
  }

  document.addEventListener("click", (event: MouseEvent) => {
    handleMenuButtonClick(event);
    handleClickOutside(event);
  });

  window.addEventListener("scroll", () => (window.scrollY > 50) && toggleOrSetMenuState(false));
  window.addEventListener("resize", () => toggleOrSetMenuState(false));
</script>