Mobile-friendly Hamburger Navigation With Submenus

A responsive, mobile-friendly, cross-device, multi-level hamburger navigation written in JavaScript and CSS/CSS3.

See It In Action:

How to use it:

1. Create a nested nav list and insert it together with your site logo to the header navigation.

<header class="header">
  <div class="header__container">
    <a href="" class="header__logo"></a>
    <div class="header__menu menu">
      <div class="menu__icon">
        <span></span>
      </div>
      <nav data-sub_menu_auto_close="true" class="menu__body">
        <ul class="menu__list">
          <li>
            <a data-goto=".page__section_1" href="" class="menu__link"
              >Section 1</a
            >
          </li>
          <li>
            <a data-goto=".page__section_2" href="" class="menu__link"
              >Section 2</a
            >
          </li>
          <li>
            <a data-goto=".page__section_3" href="" class="menu__link"
              >Section 3</a
            >
          </li>
          <li>
            <a href="" class="menu__link">Page 1</a>
            <span class="menu__arrow"></span>
            <ul class="menu__sub-list">
              <li>
                <a href="" class="menu__sub-link">Section page 1</a>
              </li>
              <li>
                <a href="" class="menu__sub-link">Section page 2</a>
              </li>
              <li>
                <a href="" class="menu__sub-link">Section page 3</a>
              </li>
            </ul>
          </li>
          <li>
            <a href="" class="menu__link">Page 2</a>
          </li>
        </ul>
      </nav>
    </div>
  </div>
</header>

2. The primary CSS styles for the navigation.

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 10;
  background-color: #912105;
}
.header__container {
  padding: 0 30px;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 70px;
}
.header__logo {
  border-radius: 50%;
  background-color: #fff;
  position: relative;
  z-index: 5;
  width: 40px;
  height: 40px;
}
.menu__icon {
  display: none;
}
.menu__list > li {
  position: relative;
  margin-left: 20px;
}
.menu__link {
  color: #fff;
  font-size: 18px;
}
.menu__sub-list {
  position: absolute;
  top: 100%;
  right: 0;
  background-color: #000;
  padding: 15px;
  min-width: 200px;
}
.menu__sub-list li {
  margin-bottom: 10px;
}
.menu__sub-list li:last-child {
  margin-bottom: 0px;
}
.menu__sub-link {
  color: #fff;
}
.menu__sub-link:hover {
  text-decoration: underline;
}
.menu__arrow {
  display: none;
}
body._pc .menu__list > li:hover .menu__sub-list {
  opacity: 1;
  visibility: visible;
  transform: translate(0, 0);
  pointer-events: all;
}
body._touch .menu__list > li {
  display: flex;
  align-items: center;
}
body._touch .menu__link {
  flex: 1 1 auto;
}
body._touch .menu__arrow {
  display: block;
  width: 0;
  height: 0;
  margin-left: 5px;
  transition: transform 0.3s ease 0s;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 10px solid #fff;
}
body._touch .menu__list > li._active .menu__sub-list {
  opacity: 1;
  visibility: visible;
  transform: translate(0, 0);
  pointer-events: all;
}
body._touch .menu__list > li._active .menu__arrow {
  transform: rotate(180deg);
}
@media (min-width: 767px) {
  .menu__list {
    display: flex;
    align-items: center;
  }
  .menu__list > li {
    padding: 10px 0;
  }
  .menu__sub-list {
    transform: translate(0, 10px);
    opacity: 0;
    visibility: hidden;
    /* to avoid mistaken hover */
    pointer-events: none;
    transition: all 0.3s ease 0s;
  }
}

3. Style the hamburger navigation on small screens.

@media (max-width: 767px) {
  .menu__icon {
    z-index: 5;
    display: block;
    position: relative;
    width: 30px;
    height: 18px;
    cursor: pointer;
  }
  .menu__icon span,
  .menu__icon::before,
  .menu__icon::after {
    left: 0;
    position: absolute;
    height: 10%;
    width: 100%;
    transition: all 0.3s ease 0s;
    background-color: #fff;
  }
  .menu__icon::before,
  .menu__icon::after {
    content: '';
  }
  .menu__icon::before {
    top: 0;
  }
  .menu__icon::after {
    bottom: 0;
  }
  .menu__icon span {
    top: 50%;
    transform: scale(1) translate(0, -50%);
  }
  .menu__icon._active span {
    transform: scale(0) translate(0, -50%);
  }
  .menu__icon._active::before {
    top: 50%;
    transform: rotate(-45deg) translate(0, -50%);
  }
  .menu__icon._active::after {
    bottom: 50%;
    transform: rotate(45deg) translate(0, 50%);
  }
  .menu__body {
    position: fixed;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    padding: 100px 30px 30px 30px;
    transition: left 0.3s ease 0s;
    /* for scroll on menu */
    overflow: auto;
  }
  .menu__body._active {
    /* use left and not transform/translate because it scroll the .menu__body::before when u scroll menu */
    left: 0;
  }
  .menu__body::before {
    content: '';
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    height: 70px;
    background-color: #912105;
    z-index: 2;
  }
  .menu__list > li {
    flex-wrap: wrap;
    margin-bottom: 30px;
  }
  .menu__list > li:last-child {
    margin-bottom: 0;
  }
  .menu__list > li._active .menu__sub-list {
    display: block;
  }
  .menu__link {
    font-size: 24px;
  }
  .menu__sub-list {
    position: relative;
    background-color: #fff;
    flex: 1 1 100%;
    margin-top: 20px;
    display: none;
  }
  .menu__sub-link {
    font-size: 20px;
    color: #000;
  }
}

4. The main JavaScript to transform the navbar into an offcanvas hamburger navigation based on the device you’re viewing on.

'use strict';
const isMobile = {
  Android: function () {
    return navigator.userAgent.match(/Android/i);
  },
  BlackBerry: function () {
    return navigator.userAgent.match(/BlackBerry/i);
  },
  iOS: function () {
    return navigator.userAgent.match(/iPhone|iPad|iPod/i);
  },
  Opera: function () {
    return navigator.userAgent.match(/Opera Mini/i);
  },
  Windows: function () {
    return navigator.userAgent.match(/IEMobile/i);
  },
  any: function () {
    return (
      isMobile.Android() ||
      isMobile.BlackBerry() ||
      isMobile.iOS() ||
      isMobile.Opera() ||
      isMobile.Windows()
    );
  },
};
if (isMobile.any()) {
  document.body.classList.add('_touch');
  let menuArrows = document.querySelectorAll('.menu__arrow');
  if (menuArrows.length > 0) {
    for (let index = 0; index < menuArrows.length; index++) {
      const menuArrow = menuArrows[index];
      menuArrow.addEventListener('click', function (e) {
        menuArrow.parentElement.classList.toggle('_active');
      });
    }
  }
} else {
  document.body.classList.add('_pc');
}
// burger menu
const iconMenu = document.querySelector('.menu__icon');
const menuBody = document.querySelector('.menu__body');
if (iconMenu) {
  iconMenu.addEventListener('click', function (e) {
    document.body.classList.toggle('_lock');
    iconMenu.classList.toggle('_active');
    menuBody.classList.toggle('_active');
  });
}
// scroll on click
const menuLinks = document.querySelectorAll('.menu__link[data-goto]');
if (menuLinks.length > 0) {
  menuLinks.forEach((menuLink) => {
    menuLink.addEventListener('click', onMenuLinkClick);
  });
  function onMenuLinkClick(e) {
    const menuLink = e.target;
    if (
      menuLink.dataset.goto &&
      document.querySelector(menuLink.dataset.goto)
    ) {
      const gotoBlock = document.querySelector(menuLink.dataset.goto);
      const gotoBlockValue =
        gotoBlock.getBoundingClientRect().top +
        pageYOffset -
        document.querySelector('.header').offsetHeight;
      if (iconMenu.classList.contains('_active')) {
        document.body.classList.remove('_lock');
        iconMenu.classList.remove('_active');
        menuBody.classList.remove('_active');
        // auto close sub-menu
        if (
          menuBody.dataset.sub_menu_auto_close &&
          document.body.classList.contains('_touch')
        ) {
          let menuArrows = document.querySelectorAll('.menu__arrow');
          for (let index = 0; index < menuArrows.length; index++) {
            menuArrows[index].parentElement.classList.remove('_active');
          }
        }
      }
      window.scrollTo({
        top: gotoBlockValue,
        behavior: 'smooth',
      });
      e.preventDefault();
    }
  }
}