Fixed Background Scrolling Layout

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A simple scrolling layout with fixed background images using background-attachment: fixed and a navigation. The page will scroll smoothly to the selected section.

The HTML

<div id="cbp-fbscroller" class="cbp-fbscroller">
	<nav>
		<a href="#fbsection1" class="cbp-fbcurrent">Section 1</a>
		<a href="#fbsection2">Section 2</a>
		<a href="#fbsection3">Section 3</a>
		<a href="#fbsection4">Section 4</a>
		<a href="#fbsection5">Section 5</a>
	</nav>
	<section id="fbsection1"></section>
	<section id="fbsection2"></section>
	<section id="fbsection3"></section>
	<section id="fbsection4"></section>
	<section id="fbsection5"></section>
</div>

The CSS

/* Set all parents to full height */
html, body, 
.container,
.cbp-fbscroller,
.cbp-fbscroller section { 
	height: 100%; 
}

/* The nav is fixed on the right side  and we center it by translating it 50% 
(we don't know it's height so we can't use the negative margin trick) */
.cbp-fbscroller > nav {
	position: fixed;
	z-index: 9999;
	right: 100px;
	top: 50%;
	-webkit-transform: translateY(-50%);
	-moz-transform: translateY(-50%);
	-ms-transform: translateY(-50%);
	transform: translateY(-50%);
}

.cbp-fbscroller > nav a {
	display: block;
	position: relative;
	color: transparent;
	height: 50px;
}

.cbp-fbscroller > nav a:after {
	content: '';
	position: absolute;
	width: 24px;
	height: 24px;
	border-radius: 50%;
	border: 4px solid #fff;
}

.cbp-fbscroller > nav a:hover:after {
	background: rgba(255,255,255,0.6);
}

.cbp-fbscroller > nav a.cbp-fbcurrent:after {
	background: #fff;
}

/* background-attachment does the trick */
.cbp-fbscroller section {
	position: relative;
	background-position: top center;
	background-repeat: no-repeat;
	background-size: cover;
	background-attachment: fixed;
}

#fbsection1 {
	background-image: url(../images/1.jpg);
}

#fbsection2 {
	background-image: url(../images/2.jpg);
}

#fbsection3 {
	background-image: url(../images/3.jpg);
}

#fbsection4 {
	background-image: url(../images/4.jpg);
}

#fbsection5 {
	background-image: url(../images/5.jpg);
}

The JavaScript

/**
 * cbpFixedScrollLayout.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
 */
var cbpFixedScrollLayout = (function() {

	// cache and initialize some values
	var config = {
		// the cbp-fbscroller´s sections
		$sections : $( '#cbp-fbscroller > section' ),
		// the navigation links
		$navlinks : $( '#cbp-fbscroller > nav:first > a' ),
		// index of current link / section
		currentLink : 0,
		// the body element
		$body : $( 'html, body' ),
		// the body animation speed
		animspeed : 650,
		// the body animation easing (jquery easing)
		animeasing : 'easeInOutExpo'
	};

	function init() {

		// click on a navigation link: the body is scrolled to the position of the respective section
		config.$navlinks.on( 'click', function() {
			scrollAnim( config.$sections.eq( $( this ).index() ).offset().top );
			return false;
		} );

		// 2 waypoints defined:
		// First one when we scroll down: the current navigation link gets updated. 
		// A `new section´ is reached when it occupies more than 70% of the viewport
		// Second one when we scroll up: the current navigation link gets updated. 
		// A `new section´ is reached when it occupies more than 70% of the viewport
		config.$sections.waypoint( function( direction ) {
			if( direction === 'down' ) { changeNav( $( this ) ); }
		}, { offset: '30%' } ).waypoint( function( direction ) {
			if( direction === 'up' ) { changeNav( $( this ) ); }
		}, { offset: '-30%' } );

		// on window resize: the body is scrolled to the position of the current section
		$( window ).on( 'debouncedresize', function() {
			scrollAnim( config.$sections.eq( config.currentLink ).offset().top );
		} );
		
	}

	// update the current navigation link
	function changeNav( $section ) {
		config.$navlinks.eq( config.currentLink ).removeClass( 'cbp-fbcurrent' );
		config.currentLink = $section.index( 'section' );
		config.$navlinks.eq( config.currentLink ).addClass( 'cbp-fbcurrent' );
	}

	// function to scroll / animate the body
	function scrollAnim( top ) {
		config.$body.stop().animate( { scrollTop : top }, config.animspeed, config.animeasing );
	}

	return { init : init };

})();

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