Responsive Off-Canvas Slide Menu with jQuery and CSS3

Yet another jQuery & CSS3 responsive off-canvas sliding menu system that supports 3-tier sub-menus based on nested Html lists. As you click the menu button, a vertical sidebar menu slides out from the left side of your browser window with an overlay covering your main content.

How to use it:

1. Create a toggle button to open the off-canvas menu.

<div id="menu-toggle">
  <div id="menu-icon"> <span></span> <span></span> <span></span> <span></span> <span></span> <span></span> </div>
  Menu 
</div>

2. Create an overlay for the main content that will focus your visitors on the off-canvas menu.

<div id="menu-overlay"></div>

3. Create the Html for a multi-level off-canvas menu using nested Html unordered lists.

<ul id="menu">
  <li><a href="#">Visit My Site</a></li>
  <li><a href="#">No children...</a></li>
  <li><a href="#">Hey - this one has some kids!</a>
    <ul>
      <li><a href="#">I'm a kid!</a></li>
      <li><a href="#">I'm a kid!</a></li>
      <li><a href="#">Got kids of my own...</a>
        <ul>
          <li><a href="#">I'm a grandkid!</a></li>
          <li><a href="#">I'm a grandkid!</a></li>
          <li><a href="#">I'm a grandkid!</a></li>
        </ul>
      </li>
    </ul>
  </li>
</ul>

4. Wrap the main content in a container with unique ID of 'page-content'

<div id="page-content">

  Your main content goes here

</div>

5. The CSS/CSS3 rules to style the off-canvas menu.

#menu-toggle {
  position: fixed;
  padding: 20px 20px 20px 65px;
  width: 100%;
  left: 0;
  top: 0;
  background: rgba(255,255,255,.9);
  color: #444444;
  z-index: 5;
}

#menu-toggle.open { left: 400px; }

#menu-icon {
  width: 45px;
  height: 35px;
  position: absolute;
  left: 10px;
  top: 10px;
  -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;
  cursor: pointer;
}

#menu-icon span {
  display: block;
  position: absolute;
  height: 5px;
  width: 50%;
  background: #00aeef;
  opacity: 1;
  -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;
}

#menu-icon span:nth-child(even) { left: 50%; }

#menu-icon span:nth-child(odd) { left: 0px; }

#menu-icon span:nth-child(1),
#menu-icon span:nth-child(2) { top: 5px; }

#menu-icon span:nth-child(3),
#menu-icon span:nth-child(4) { top: 15px; }

#menu-icon span:nth-child(5),
#menu-icon span:nth-child(6) { top: 25px; }

#menu-icon.open span:nth-child(1),
#menu-icon.open span:nth-child(6) {
  -webkit-transform: rotate(45deg);
  -moz-transform: rotate(45deg);
  -o-transform: rotate(45deg);
  transform: rotate(45deg);
}

#menu-icon.open span:nth-child(2),
#menu-icon.open span:nth-child(5) {
  -webkit-transform: rotate(-45deg);
  -moz-transform: rotate(-45deg);
  -o-transform: rotate(-45deg);
  transform: rotate(-45deg);
}

#menu-icon.open span:nth-child(1) {
  left: 5px;
  top: 8px;
}

#menu-icon.open span:nth-child(2) {
  left: calc(50% - 5px);
  top: 8px;
}

#menu-icon.open span:nth-child(3) {
  left: -50%;
  opacity: 0;
}

#menu-icon.open span:nth-child(4) {
  left: 100%;
  opacity: 0;
}

#menu-icon.open span:nth-child(5) {
  left: 5px;
  top: 21px;
}

#menu-icon.open span:nth-child(6) {
  left: calc(50% - 5px);
  top: 21px;
}

/* MENU STYLES */

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

#menu {
  background: #222222;
  width: 400px;
  position: fixed;
  top: 0;
  bottom: 0;
  left: -400px;
  z-index: 4;
}

#menu li { position: relative; }

#menu.open { left: 0; }

#menu a {
  display: block;
  padding: 15px;
  text-decoration: none;
  color: #929292;
}

#menu a:hover { color: white; }

#menu > .parent > ul {
  position: fixed;
  top: 0;
  bottom: 0;
  left: -100%;
  width: 355px;
}

#menu > .parent > ul > .parent > ul {
  position: fixed;
  top: 0;
  bottom: 0;
  left: -100%;
  width: 310px;
}

#menu > .parent.open > ul {
  left: 0;
  background: #333333;
}

#menu > .parent.open > ul > .parent.open > ul {
  left: 0;
  background: #444444;
}

.submenu-toggle {
  position: absolute;
  right: 0px;
  top: 0px;
  cursor: pointer;
  width: 45px;
  height: 45px;
  text-indent: -5000px;
  overflow: hidden;
}

.submenu-toggle.open {
  background: rgba(255,255,255,.1);
  height: 100%;
  z-index: 5000;
  top: 0;
}

.submenu-toggle:before,
.submenu-toggle:after { -webkit-transition: .5s ease-in-out; }

.submenu-toggle:before {
  content: '';
  display: block;
  position: absolute;
  height: 16px;
  width: 16px;
  top: 12px;
  right: 15px;
  border-top: 5px solid #929292;
  border-right: 5px solid #929292;
  -webkit-transform: rotate(45deg);
}

.submenu-toggle:after {
  content: '';
  display: block;
  position: absolute;
  height: 16px;
  width: 16px;
  top: 12px;
  left: 50px;
  border-top: 5px solid #929292;
  border-right: 5px solid #929292;
  -webkit-transform: rotate(-135deg);
}

.submenu-toggle:hover:before,
.submenu-toggle:hover:after { border-color: white; }

.submenu-toggle.open:before { right: 23px; }

.submenu-toggle.open:after { left: 23px; }

#menu-overlay {
  position: fixed;
  width: 100%;
  background: red;
  top: 55px;
  bottom: 0;
  left: 0;
  z-index: 0;
  background: rgba(255,255,255,.0);
}

#menu-overlay.open {
  z-index: 3;
  background: rgba(255,255,255,.9);
}

6. Include the latest version of jQuery javascript library at the bottom of your page.

<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>

7. The jQuery script to enable the off-canvas menu.

$(document).ready(function(){
  
  // NAVIGATION MENU
  
  // menu icon states, opening main nav
  $('#menu-icon').click(function(){
    $(this).toggleClass('open');
    $('#menu,#menu-toggle,#page-content,#menu-overlay').toggleClass('open');
    $('#menu li,.submenu-toggle').removeClass('open');
  });
  
  // clicking on overlay closes menu
  $('#menu-overlay').click(function(){
    $('*').removeClass('open');
  });
  
  // add child menu toggles and parent class
  $('#menu li').has('ul').addClass('parent').prepend('<div class="submenu-toggle">open</div>');
  
  // toggle child menus
  $('.submenu-toggle').click(function(){
    var currentToggle=$(this);
    currentToggle.parent().toggleClass('open');
    currentToggle.toggleClass('open');
  });
});

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