Multi-level Mobile Navigation With jQuery And CSS3

This is a jQuery & CSS3 based off-canvas mobile navigation where the user has the ability to access sub menu items just like a drill down menu.

How to use it:

1. Create a nested nav list for the mobile navigation.

<nav>
  <div class="toggle"><span>Menu</span></div>
  <div class="menu-container">
    <ul class="menu visually-hidden">
      <li><a>Home</a></li>
      <li class="has-children"><a>Category<span>more</span></a>
        <ul class="submenu">
          <li><a>jQuery</a></li>
          <li><a>HTML5</a></li>
          <li><a>CSS3</a></li>
        </ul>
      </li>
      <li><a>About</a></li>
      <li><a>Contact</a></li>
      <li class="has-children"><a>Social<span>more</span></a>
        <ul class="submenu">
          <li><a>Facebook</a></li>
          <li><a>Twitter</a></li>
        </ul>
      </li>
    </ul>
  </div>
</nav>

2. The core CSS / CSS styles for the mobile navigation.

nav {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 60px;
  background-color: #242424;
  -webkit-transform: translate3d(0, 0, 0);
  transform: translate3d(0, 0, 0);
}

.menu-container {
  position: relative;
  -webkit-transform: translateX(0);
  transform: translateX(0);
  -webkit-transition: -webkit-transform 0.25s ease-out;
  transition: -webkit-transform 0.25s ease-out;
  transition: transform 0.25s ease-out;
  transition: transform 0.25s ease-out, -webkit-transform 0.25s ease-out;
}

.view-submenu .menu-container {
  -webkit-transform: translateX(-100%);
  transform: translateX(-100%);
}

ul {
  position: absolute;
  top: 60px;
  padding: 6px;
  width: 100%;
  height: 508px;
  color: #ededed;
  background-color: #313131;
}

ul li a {
  opacity: 0;
  display: block;
  padding: 10px 12px;
  position: relative;
  cursor: pointer;
  border-radius: 3px;
  -webkit-transform: translateY(12px);
  transform: translateY(12px);
  -webkit-transition: opacity 0.15s 0.1s ease-out, -webkit-transform 0.15s 0.1s ease-out;
  transition: opacity 0.15s 0.1s ease-out, -webkit-transform 0.15s 0.1s ease-out;
  transition: opacity 0.15s 0.1s ease-out, transform 0.15s 0.1s ease-out;
  transition: opacity 0.15s 0.1s ease-out, transform 0.15s 0.1s ease-out, -webkit-transform 0.15s 0.1s ease-out;
}

ul li.has-children span {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  margin: auto;
  padding: 12px 16px;
  text-indent: -9999px;
}

ul li.has-children span:after {
  content: "";
  position: absolute;
  top: 0;
  right: 12px;
  bottom: 0;
  margin: auto;
  padding: 4px;
  width: 0px;
  height: 0px;
  cursor: pointer;
  font-size: 0;
  border-bottom: 2px solid #ededed;
  border-right: 2px solid #ededed;
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);
}

ul li.has-children span:hover:after { border-color: #bababa; }

.menu {
  opacity: 0;
  -webkit-transition: background-color 0.25s ease-out, opacity 0.15s ease-out;
  transition: background-color 0.25s ease-out, opacity 0.15s ease-out;
}

.menu.is-visible { opacity: 1; }

.menu.is-visible li a {
  opacity: 1;
  -webkit-transform: translateY(0);
  transform: translateY(0);
}

.view-submenu .menu { background-color: #3e3e3e; }

.view-submenu .menu > li > a {
  opacity: 0;
  -webkit-transition: opacity 0.15s ease-out;
  transition: opacity 0.15s ease-out;
}

.submenu {
  position: absolute;
  top: 0;
  left: 100%;
  background-color: #313131;
}

.submenu li { margin-left: 60px; }

.hide-submenu {
  position: absolute;
  top: 0;
  left: 0;
  width: 60px;
  height: 508px;
  cursor: pointer;
  background-color: #313131;
  -webkit-transition: background-color 0.25s ease-out;
  transition: background-color 0.25s ease-out;
}

.hide-submenu:before {
  opacity: 0;
  content: "";
  position: absolute;
  top: 0;
  right: 12px;
  bottom: 0;
  margin: auto;
  padding: 4px;
  width: 6px;
  height: 6px;
  cursor: pointer;
  font-size: 0;
  border-bottom: 2px solid #ededed;
  border-right: 2px solid #ededed;
  -webkit-transform: rotate(135deg);
  transform: rotate(135deg);
  left: 0;
  right: -6px;
  -webkit-transition: opacity 0.1s ease-out;
  transition: opacity 0.1s ease-out;
}

.view-submenu .hide-submenu { background-color: #3e3e3e; }

.view-submenu .hide-submenu:before {
  opacity: 1;
  -webkit-transition: opacity 0.15s 0.3s ease-out;
  transition: opacity 0.15s 0.3s ease-out;
}

.visually-hidden {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}

3. Style the navigation toggle with the following CSS snippets.

.toggle {
  position: absolute;
  display: -webkit-box;
  display: -webkit-flex;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-align: center;
  -webkit-align-items: center;
  -ms-flex-align: center;
  align-items: center;
  top: 0;
  left: 18px;
  bottom: 0;
  margin: auto;
  cursor: pointer;
}

.toggle span {
  position: relative;
  -webkit-align-self: center;
  -ms-flex-item-align: center;
  align-self: center;
  font-size: 0;
  width: 26px;
  height: 2px;
  background-color: #ededed;
  border-radius: 100px;
  -webkit-transition: background-color 0.2s ease-out;
  transition: background-color 0.2s ease-out;
}

.toggle span:before, .toggle span:after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background-color: #ededed;
  border-radius: 100px;
  -webkit-transition: -webkit-transform .2s ease-out;
  transition: -webkit-transform .2s ease-out;
  transition: transform .2s ease-out;
  transition: transform .2s ease-out, -webkit-transform .2s ease-out;
}

.toggle span:before { bottom: calc(100% + 6px); }

.toggle span:after { top: calc(100% + 6px); }

.is-visible .toggle span { background-color: transparent; }

.is-visible .toggle span:before {
  bottom: auto;
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
}

.is-visible .toggle span:after {
  top: auto;
  -webkit-transform: rotate(-45deg);
  transform: rotate(-45deg);
}

4. Don't forget to load the latest jQuery library in the webpage.

<script src="//code.jquery.com/jquery-3.0.0.min.js"></script> 

5. The JavaScript (jQuery script) to enable the mobile navigation.

var nav           = $('nav');
var menu          = $('.menu');
var menuContainer = $('.menu-container');
var subMenu       = $('.submenu');
var toggle        = $('.toggle');
var subToggle     = $('.has-children span');
var back          = '<div class="hide-submenu"></div>';
var subHide       = $(back);

// Toggle menu
toggle.on("click", function() {
  nav.toggleClass('is-visible');
  if(menu.hasClass('visually-hidden')) {
    menu.toggleClass('visually-hidden is-visible')
  } else {
    menu.removeClass('is-visible');
    // Wait for CSS animation
    setTimeout(function() {
      nav.removeClass('view-submenu');
      menu.addClass('visually-hidden');
    }, 200);
  }
});

// Add submenu hide bar
subHide.prependTo(subMenu);
var subHideToggle = $('.hide-submenu');

// Show submenu
subToggle.on("click", function() {
  nav.addClass('view-submenu');
  // Hide all the submenus...
  subMenu.hide();
  // ...except for the one being called
  $(this).parents('li').find('.submenu').show();
});

// Hide submenu
subHideToggle.on("click", function() {
  nav.removeClass('view-submenu');
});

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This awesome jQuery plugin is developed by hexagoncircle. For more Advanced Usages, please check the demo page or visit the official website.