Mobile-Friendly & Multi-level Dropdown Menu with jQuery

A responsive, mobile-friendly, animated, multi-level navigation that automatically transforms to a vertical dropdown toggle menu when it reaches a CSS breakpoint.

How to use it:

1. Create a multi-level navigation from a nested nav list.

<nav id="menu-wrap">
  <ul id="menu">
    <li><a href="#">Home</a></li>
    <li><a href="#">About</a></li>
    <li> <a href="#">Services</a>
      <ul>
        <li><a href="#">Web Design</a>
          <ul>
            <li><a href="#">HTML5/CSS3</a></li>
            <li><a href="#">jQuery</a></li>
            <li><a href="#">Photoshop</a></li>
          </ul>
        </li>
        <li><a href="#">Web Programming</a>
          <ul>
            <li><a href="#">Go</a></li>
            <li><a href="#">Ruby</a></li>
            <li><a href="#">Python</a></li>
          </ul>
        </li>
      </ul>
    </li>
    <li><a href="#">Contact</a>
      <ul>
        <li><a href="#">Facebook</a></li>
        <li><a href="#">Twitter</a></li>
        <li><a href="#">Linkedin</a></li>
        <li><a href="#">Google Plus</a></li>
      </ul>
    </li>
    <li><a href="#">Blog</a></li>
  </ul>
</nav>

2. The basic CSS/CSS3 styles for the navigation menu.

#menu,
#menu ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

#menu {
  width: 90%;
  margin: 60px auto;
  border: 1px solid #107677;
  background: #111;
  background: linear-gradient(#1ebdbe, #107677);
  border-radius: 6px;
  box-shadow: 0 2px 2px #ccc;
}

#menu:before,
#menu:after {
  content: "";
  display: block;
}

#menu:after { clear: both; }

#menu li {
  float: left;
  background: url(../img/sep.png) no-repeat;
  position: relative;
}

#menu a {
  float: left;
  padding: 12px 30px;
  color: #fff;
  text-decoration: none;
  text-transform: uppercase;
  font: bold 12px Arial, Helvetica;
}

#menu ul {
  margin: 20px 0 0 0;
  opacity: 0;
  visibility: hidden;
  position: absolute;
  top: 38px;
  left: 0;
  z-index: 1;
  background: linear-gradient(#1ebdbe, #107677);
  box-shadow: 0 -1px 0 rgba(255,255,255,.3);
  border-radius: 3px;
  transition: all .2s ease-in-out;
}

#menu li:hover > ul {
  opacity: 1;
  visibility: visible;
  margin: 0;
}

#menu ul ul {
  top: 0;
  left: 150px;
  margin: 0 0 0 20px;
  box-shadow: 0 -1px 0 rgba(255,255,255,.3);
}

#menu ul a {
  padding: 10px;
  width: 130px;
  display: block;
  white-space: nowrap;
  float: none;
  text-transform: none;
}

#menu ul a:hover { background: linear-gradient(#1ebdbe, #107677); }

#menu ul li:first-child > a:after {
  content: '';
  position: absolute;
  left: 40px;
  top: -6px;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-bottom: 6px solid #1ebdbe;
}

#menu ul ul li:first-child > a:after {
  left: -6px;
  top: 50%;
  margin-top: -6px;
  border-left: 0;
  border-top: 6px solid transparent;
  border-right: 6px solid #107677;
  border-bottom: 6px solid transparent;
}

#menu-trigger { display: none; }

3. Change the horizontal navigation to a dropdown toggle menu when it reaches a certain breakpoint specified in the CSS3 media queries.

@media(max-width: 767px) {

#menu-wrap { position: relative; }

#menu-wrap * { box-sizing: border-box; }

#menu-trigger {
  display: block;
  height: 40px;
  line-height: 40px;
  cursor: pointer;
  padding: 0 0 0 35px;
  border: 1px solid #107677;
  color: #fff;
  font-weight: bold;
  background-color: #111;
  background: url(../img/menu.png) no-repeat 10px center, linear-gradient(#1ebdbe, #107677);
  border-radius: 6px;
}

#menu {
  margin: 0;
  padding: 10px;
  position: absolute;
  top: 40px;
  width: 100%;
  z-index: 1;
  display: none;
  box-shadow: none;
}

#menu:after {
  content: '';
  position: absolute;
  left: 25px;
  top: -8px;
  border-left: 8px solid transparent;
  border-right: 8px solid transparent;
  border-bottom: 8px solid #107677;
}

#menu ul {
  position: static;
  visibility: visible;
  opacity: 1;
  margin: 0;
  background: none;
  box-shadow: none;
}

#menu ul ul {
  margin: 0 0 0 20px;
  box-shadow: none;
}

#menu li {
  position: static;
  display: block;
  float: none;
  border: 0;
  margin: 5px;
  box-shadow: none;
  background: none !important;
}

#menu ul li {
  margin-left: 20px;
  box-shadow: none;
}

#menu a {
  display: block;
  float: none;
  padding: 0;
  color: #fff;
}

#menu a:hover { color: #fafafa; }

#menu ul a {
  padding: 0;
  width: auto;
}

#menu ul a { background: none !important; }

}

4. Load the needed jQuery library at the bottom of the document.

<script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script> 

5. Enable the Mobile-Friendly & Multi-level Dropdown Menu with a little bit of JavaScript.

$(document).ready(function(){
  $('#menu-wrap').prepend('<div id="menu-trigger">Menu</div>');
  $('#menu-trigger').on('click', function(){
    $('#menu').slideToggle();
  });
});

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