Horizontal Slide Out Menu

A simple, horizontal slide out menu with a grid-like thumbnail layout for the submenu. The menu slides out from the top when a main menu item is clicked and the sub-items fade in. When clicking on another item, the height of the submenu will adjust and the content will fade in and out while switching.

Some media query examples show how to make the menu responsive and change the view to a touch-friendly vertically stacked navigation.

The HTML

<nav class="cbp-hsmenu-wrapper" id="cbp-hsmenu-wrapper">
	<div class="cbp-hsinner">
		<ul class="cbp-hsmenu">
			<li>
				<a href="#">Lovely Spirits</a>
				<ul class="cbp-hssubmenu">
					<li><a href="#"><img src="images/1.png" alt="img01"/><span>Delicate Wine</span></a></li>
					<li><a href="#"><img src="images/2.png" alt="img02"/><span>Fine Spirit</span></a></li>
					<li><a href="#"><img src="images/3.png" alt="img03"/><span>Heavenly Ale</span></a></li>
					<li><a href="#"><img src="images/4.png" alt="img04"/><span>Juicy Lemonade</span></a></li>
					<li><a href="#"><img src="images/5.png" alt="img05"/><span>Wise Whiskey</span></a></li>
					<li><a href="#"><img src="images/6.png" alt="img06"/><span>Sweet Rum</span></a></li>
				</ul>
			</li>
			<li>
				<a href="#">Delicious Beverages</a>
				<ul class="cbp-hssubmenu cbp-hssub-rows">
					<li><a href="#"><img src="images/7.png" alt="img07"/><span>Lovely Slurp</span></a></li>
					<li><a href="#"><img src="images/8.png" alt="img08"/><span>Lemony Grappa</span></a></li>
					<li><a href="#"><img src="images/9.png" alt="img09"/><span>Eggy Liquor</span></a></li>
					<li><a href="#"><img src="images/10.png" alt="img10"/><span>Fresh Juice</span></a></li>
					<li><a href="#"><img src="images/1.png" alt="img01"/><span>Delicate Wine</span></a></li>
					<li><a href="#"><img src="images/2.png" alt="img02"/><span>Fine Spirit</span></a></li>
					<li><a href="#"><img src="images/3.png" alt="img03"/><span>Heavenly Ale</span></a></li>
					<li><a href="#"><img src="images/4.png" alt="img04"/><span>Juicy Lemonade</span></a></li>
					<li><a href="#"><img src="images/5.png" alt="img05"/><span>Wise Whiskey</span></a></li>
					<li><a href="#"><img src="images/6.png" alt="img06"/><span>Sweet Rum</span></a></li>
					<li><a href="#"><img src="images/1.png" alt="img01"/><span>Delicate Wine</span></a></li>
					<li><a href="#"><img src="images/2.png" alt="img02"/><span>Fine Spirit</span></a></li>
				</ul>
			</li>
			<li>
				<a href="#">Fine Liquors</a>
				<ul class="cbp-hssubmenu">
					<li><a href="#"><img src="images/10.png" alt="img10"/><span>Fresh Juice</span></a></li>
					<li><a href="#"><img src="images/6.png" alt="img06"/><span>Sweet Rum</span></a></li>
					<li><a href="#"><img src="images/9.png" alt="img09"/><span>Eggy Liquor</span></a></li>
				</ul>
			</li>
			<li><a href="#">Our Mission</a></li>
			<li><a href="#">Contact</a></li>
		</ul>
	</div>
</nav>

The CSS

@font-face {
	font-family: 'bpmenu';
	src:url('../fonts/bpmenu/bpmenu.eot');
	src:url('../fonts/bpmenu/bpmenu.eot?#iefix') format('embedded-opentype'),
		url('../fonts/bpmenu/bpmenu.woff') format('woff'),
		url('../fonts/bpmenu/bpmenu.ttf') format('truetype'),
		url('../fonts/bpmenu/bpmenu.svg#bpmenu') format('svg');
	font-weight: normal;
	font-style: normal;
}

/* Main menu wrapper */
.cbp-hsmenu-wrapper {
	position: relative;
}

/* Common style for all lists */
.cbp-hsmenu-wrapper ul {
	list-style: none;
	padding: 0;
	margin: 0 auto;
}

/* 100% width bar for menu */
.cbp-hsinner {
	background: #47a3da;
	position: relative;
	z-index: 100;
}

/* Main menu style */
.cbp-hsmenu-wrapper .cbp-hsmenu {
	width: 90%;
	max-width: 69em;
	margin: 0 auto;
	padding: 0 1.875em;
}

.cbp-hsmenu > li {
	margin-left: 4em;
	display: inline-block;
}

.cbp-hsmenu > li:first-child {
	margin-left: 0;
}

/* Main menu link style */
.cbp-hsmenu > li > a {
	color: #fff;
	font-size: 1.2em;
	line-height: 3em;
	display: inline-block;
	position: relative;
	z-index: 10000;
	outline: none;
}

.no-touch .cbp-hsmenu > li > a:hover,
.no-touch .cbp-hsmenu > li > a:focus,
.cbp-hsmenu > li.cbp-hsitem-open > a {
	color: #02639d;
}

/* Add an arrow to the main menu link if it has a submenu (not the only child) */
.cbp-hsmenu > li > a:not(:only-child):before {
	display: inline-block;
	font-family: 'bpmenu';
	speak: none;
	font-style: normal;
	font-weight: normal;
	font-variant: normal;
	text-transform: none;
	line-height: 1;
	-webkit-font-smoothing: antialiased;
	content: "f107";
	font-size: 80%;
	margin-right: 0.3em;
	opacity: 0.4;
	vertical-align: middle;
}

.cbp-hsmenu > li.cbp-hsitem-open > a:not(:only-child):before {
	content: "f106";
}

/* Add a triangle to currently open menu item link */
.cbp-hsmenu > li.cbp-hsitem-open > a:after {
	top: 100%;
	border: solid transparent;
	content: " ";
	height: 0;
	width: 0;
	position: absolute;
	pointer-events: none;
	border-color: transparent;
	border-top-color: #47a3da;
	border-width: 10px;
	left: 50%;
	margin-left: -10px;
}

/* Submenu style */
.cbp-hssubmenu {
	position: absolute;
	left: 0;
	top: 100%;
	width: 100%;
	z-index: 0;
	text-align: center; /* for aligning the sub items */
	visibility: hidden;
}

.cbp-hssubmenu:before, 
.cbp-hssubmenu:after { 
	content: " "; 
	display: table; 
}
.cbp-hssubmenu:after { 
	clear: both; 
}

/* Let's allow 6 item in a row */
.cbp-hssubmenu > li {
	width: 16.2%;
	display: inline-block;
	vertical-align: top;
	box-shadow: -28px 0 0 -27px #ddd, 0 -28px 0 -27px #ddd;
	opacity: 0;
	-webkit-transition: opacity 0.1s 0s;
	-moz-transition: opacity 0.1s 0s;
	transition: opacity 0.1s 0s;
}

/* First 6 items don't have upper box shadow */
.cbp-hssubmenu > li:nth-child(-n+6) {
	box-shadow: -28px 0 0 -27px #ddd;
} 

/* Every 7th item does not have a left box shadow */
.cbp-hssubmenu > li:nth-child(6n+1) {
	box-shadow:  0 -28px 0 -27px #ddd;
}

/* The first one does not have any box shadow */
.cbp-hssubmenu > li:first-child {
	box-shadow: none;
}

.cbp-hssubmenu > li a {
	display: block;
	text-align: center;
	color: #a2a2a2;
	outline: none;
	padding: 2em 1em 1em 1em;
}

.no-touch .cbp-hssubmenu > li a:hover,
.no-touch .cbp-hssubmenu > li a:focus {
	color: #888;
}

.cbp-hssubmenu > li a img {
	border: none;
	outline: none;
	display: inline-block;
	margin: 0;
	max-width: 100%;
	-webkit-transition: opacity 0.2s;
	-moz-transition: opacity 0.2s;
	transition: opacity 0.2s;
}

.no-touch .cbp-hssubmenu > li a:hover img {
	opacity: 0.5;
}

.cbp-hssubmenu > li a span {
	display: block;
	min-height: 3em;
	margin-top: 0.4em;
}

.cbp-hsmenu > li.cbp-hsitem-open .cbp-hssubmenu {
	z-index: 1000;
	visibility: visible;
}

.cbp-hsmenu > li.cbp-hsitem-open .cbp-hssubmenu > li {
	opacity: 1;
	-webkit-transition: opacity 0.5s 0.1s;
	-moz-transition: opacity 0.5s 0.1s;
	transition: opacity 0.5s 0.1s;
}

/* Helper div for animating the background */
.cbp-hsmenubg {
	background: #f7f7f7;
	position: absolute;
	width: 100%;
	top: 100%;
	left: 0;
	z-index: 0;
	height: 0px;
}

.no-touch .cbp-hsmenubg {
	-webkit-transition: height 0.3s;
	-moz-transition: height 0.3s;
	transition: height 0.3s;
}

@media screen and (max-width: 65em){
	.cbp-hsmenu-wrapper {
		font-size: 80%;
	}
}

@media screen and (max-width: 51.4375em){
	.cbp-hsmenu-wrapper {
		font-size: 100%;
	}

	.cbp-hsmenu-wrapper .cbp-hsmenu {
		padding: 0;
		max-width: none;
		width: 100%;
	}

	.cbp-hsmenu > li {
		border-top: 1px solid rgba(255,255,255,0.5);
		text-align: center;
		margin: 0 auto;
		display: block;
	}

	.cbp-hsmenu > li:first-child {
		border-top: none;
	}

	.cbp-hsmenu > li > a {
		display: block;
	}

	.cbp-hsmenu > li > a:not(:only-child):before {
		line-height: 1.8;
		right: 0;
		position: absolute;
		font-size: 200%;
	}

	.cbp-hsmenubg {
		display: none;
	}

	.cbp-hssubmenu {
		background: #f7f7f7;
		position: relative;
		overflow: hidden;
		height: 0;
	}

	.cbp-hsmenu > li.cbp-hsitem-open .cbp-hssubmenu {
		height: auto;
	}

	/* Let's only allow 3 item in a row now */
	.cbp-hssubmenu > li {
		width: 30%;
	}

	/* Reset box shadows for the 6 items in row case */
	.cbp-hssubmenu > li:nth-child(-n+6),
	.cbp-hssubmenu > li:nth-child(6n+1) {
		box-shadow: -28px 0 0 -27px #ddd, 0 -28px 0 -27px #ddd;
	}

	/* First 4 items don't have upper box shadow */
	.cbp-hssubmenu > li:nth-child(-n+3) {
		box-shadow: -28px 0 0 -27px #ddd;
	} 

	/* Every 5th item does not have a left box shadow */
	.cbp-hssubmenu > li:nth-child(3n+1) {
		box-shadow:  0 -28px 0 -27px #ddd;
	}

}

@media screen and (max-width: 25em){
	/* Let's only allow 1 item in a row now */
	.cbp-hssubmenu > li {
		width: 100%;
		display: block;
	}

	.cbp-hsmenu-wrapper .cbp-hssubmenu > li {
		box-shadow: 0 1px #cecece;
		text-align: left;
	}

	.cbp-hssubmenu > li a {
		text-align: left;
		line-height: 50px;
		padding: 0.4em 1em;
	}

	.cbp-hssubmenu > li a img {
		float: left;
		max-height: 50px;
	}

	.cbp-hssubmenu > li a span {
		min-height: 0;
		margin: 0;
	}
}

The JavaScript

/**
 * cbpHorizontalSlideOutMenu.js v1.0.0
 * http://www.codrops.com
 *
 * Licensed under the MIT license.
 * http://www.opensource.org/licenses/mit-license.php
 * 
 * Copyright 2013, Codrops
 * http://www.codrops.com
 */
;( function( window ) {
	
	'use strict';

	var document = window.document;

	function extend( a, b ) {
		for( var key in b ) { 
			if( b.hasOwnProperty( key ) ) {
				a[key] = b[key];
			}
		}
		return a;
	}

	function cbpHorizontalSlideOutMenu( el, options ) {	
		this.el = el;
		this.options = extend( this.defaults, options );
		this._init();
	}

	cbpHorizontalSlideOutMenu.prototype = {
		defaults : {},
		_init : function() {
			this.current = -1;
			this.touch = Modernizr.touch;
			this.menu = this.el.querySelector( '.cbp-hsmenu' );
			this.menuItems = this.el.querySelectorAll( '.cbp-hsmenu > li' );
			this.menuBg = document.createElement( 'div' );
			this.menuBg.className = 'cbp-hsmenubg';
			this.el.appendChild( this.menuBg );
			this._initEvents();
		},
		_openMenu : function( el, ev ) {
			
			var self = this,
				item = el.parentNode,
				items = Array.prototype.slice.call( this.menuItems ),
				submenu = item.querySelector( '.cbp-hssubmenu' ),
				closeCurrent = function( current ) {
					var current = current || self.menuItems[ self.current ];
					current.className = '';
					current.setAttribute( 'data-open', '' );	
				},
				closePanel = function() {
					self.current = -1;
					self.menuBg.style.height = '0px';
				};

			if( submenu ) {

				ev.preventDefault();

				if( item.getAttribute( 'data-open' ) === 'open' ) {
					closeCurrent( item );
					closePanel();
				}
				else {
					item.setAttribute( 'data-open', 'open' );
					if( self.current !== -1 ) {
						closeCurrent();
					}
					self.current = items.indexOf( item );
					item.className = 'cbp-hsitem-open';
					self.menuBg.style.height = submenu.offsetHeight + 'px';
				}
			}
			else {
				if( self.current !== -1 ) {
					closeCurrent();
					closePanel();
				}
			}

		},
		_initEvents : function() {
			
			var self = this;

			Array.prototype.slice.call( this.menuItems ).forEach( function( el, i ) {
				var trigger = el.querySelector( 'a' );
				if( self.touch ) {
					trigger.addEventListener( 'touchstart', function( ev ) { self._openMenu( this, ev ); } );
				}
				else {
					trigger.addEventListener( 'click', function( ev ) { self._openMenu( this, ev ); } );	
				}
			} );
			
			window.addEventListener( 'resize', function( ev ) { self._resizeHandler(); } );

		},
		// taken from https://github.com/desandro/vanilla-masonry/blob/master/masonry.js by David DeSandro
		// original debounce by John Hann
    	// http://unscriptable.com/index.php/2009/03/20/debouncing-javascript-methods/
		_resizeHandler : function() {
			var self = this;
			function delayed() {
				self._resize();
				self._resizeTimeout = null;
			}

			if ( this._resizeTimeout ) {
				clearTimeout( this._resizeTimeout );
			}

			this._resizeTimeout = setTimeout( delayed, 50 );
		},
		_resize : function() {
			if( this.current !== -1 ) {
				this.menuBg.style.height = this.menuItems[ this.current ].querySelector( '.cbp-hssubmenu' ).offsetHeight + 'px';
			}
		}
	}

	// add to global namespace
	window.cbpHorizontalSlideOutMenu = cbpHorizontalSlideOutMenu;

} )( window );