Kontext - A context-shift transition inspired by iOS

Kontext is a context-shift transition inspired by iOS. Created using JavaScript, CSS 3D transforms and CSS Animations.

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Source: github.com

1. INCLUDE CSS AND JS FILES

<link rel="stylesheet" href="css/kontext.css">
<script src="js/kontext.js"></script>

2. HTML

<article class="kontext">
	<div class="layer one show">
		<h2>Kontext</h2>
		<p>A context-shift transition. Use the dots below or your keyboard arrows.</p>
	</div>
	<div class="layer two">
		<h2>Layer Two</h2>
	</div>
	<div class="layer three">
		<h2>Layer Three</h2>
	</div>
</article>

<ul class="bullets"></ul>

3. JAVASCRIPT

// Create a new instance of kontext
var k = kontext( document.querySelector( '.kontext' ) );


// API METHODS:

// k.prev(); // Show prev layer
// k.next(); // Show next layer
// k.show( 3 ); // Show specific layer
// k.getIndex(); // Index of current layer
// k.getTotal(); // Total number of layers


// DEMO-SPECIFIC:

var bulletsContainer = document.body.querySelector( '.bullets' );

// Create one bullet per layer
for( var i = 0, len = k.getTotal(); i < len; i++ ) {
	var bullet = document.createElement( 'li' );
	bullet.className = i === 0 ? 'active' : '';
	bullet.setAttribute( 'index', i );
	bullet.onclick = function( event ) { k.show( event.target.getAttribute( 'index' ) ) };
	bullet.ontouchstart = function( event ) { k.show( event.target.getAttribute( 'index' ) ) };
	bulletsContainer.appendChild( bullet );
}

// Update the bullets when the layer changes
k.changed.add( function( layer, index ) {
	var bullets = document.body.querySelectorAll( '.bullets li' );
	for( var i = 0, len = bullets.length; i < len; i++ ) {
		bullets[i].className = i === index ? 'active' : '';
	}
} );

document.addEventListener( 'keyup', function( event ) {
	if( event.keyCode === 37 ) k.prev();
	if( event.keyCode === 39 ) k.next();
}, false );

var touchX = 0;
var touchConsumed = false;

document.addEventListener( 'touchstart', function( event ) {
	touchConsumed = false;
	lastX = event.touches[0].clientX;
}, false );

document.addEventListener( 'touchmove', function( event ) {
	event.preventDefault();

	if( !touchConsumed ) {
		if( event.touches[0].clientX > lastX + 10 ) {
			k.prev();
			touchConsumed = true;
		}
		else if( event.touches[0].clientX < lastX - 10 ) {
			k.next();
			touchConsumed = true;
		}
	}
}, false );