Zoom Slider

Today’s Blueprint is a simple content slider with depth-like zoom functionality. Each slide has a predefined zoom area that will be used to calculate the appropriate scale value for a fullscreen fill. Once the icon for zooming is clicked, the zoom area as well as the page get scaled, creating the illusion that the viewer is approaching the item. Once the whole page is covered, we show some more details.

Navigating the slider will animate the inner parts of the slide, allowing for an independent control of the image area and the title. We are using CSS transitions and dymanic.js for moving the slide elements. Dymanic.js by Michaël Villar is a JavaScript library to create physics-based animations.

Please note that we are using a couple of modern CSS properties, so only contemporary browsers are supported.

• ChromeSupported
• FirefoxSupported
• Internet ExplorerSupported from version 10+
• SafariSupported
• OperaSupported

The HTML

<!-- Main container -->
<div class="container">
	<!-- Blueprint header -->
	<header class="bp-header cf">
		<!-- Page title etc. -->
	</header>
	<!-- Grid -->
	<section class="slider">
		<div class="slide slide--current" data-content="content-1">
			<div class="slide__mover">
				<div class="zoomer flex-center">
					<img class="zoomer__image" src="images/iphone.png" alt="iPhone" />
					<div class="preview">
						<img src="images/iphone-content-preview.png" alt="iPhone app preview" />
						<div class="zoomer__area zoomer__area--size-2"></div>
					</div>
				</div>
			</div>
			<h2 class="slide__title"><span>The Classy</span> iPhone 6</h2>
		</div>
		<div class="slide" data-content="content-2">
			<!-- ... -->
		</div>
		<!-- ... -->
		<nav class="slider__nav">
			<button class="button button--nav-prev">
				<i class="icon icon--arrow-left"></i>
				<span class="text-hidden">Previous product</span>
			</button>
			<button class="button button--zoom">
				<i class="icon icon--zoom"></i>
				<span class="text-hidden">View details</span>
			</button>
			<button class="button button--nav-next">
				<i class="icon icon--arrow-right"></i>
				<span class="text-hidden">Next product</span>
			</button>
		</nav>
	</section>
	<!-- /slider-->
	<!-- content -->
	<section class="content">
		<div class="content__item" id="content-1">
			<img class="content__item-img rounded-right" src="images/iphone-content.png" alt="Apple Watch Content" />
			<div class="content__item-inner">
				<h2>The iPhone 6</h2>
				<h3>Incredible performance for powerful apps</h3>
				<p>...</p>
			</div>
		</div>
		<div class="content__item" id="content-2">
			<!-- ... -->
		</div>
		<!-- ... -->
		<button class="button button--close">
			<i class="icon icon--circle-cross"></i>
			<span class="text-hidden">Close content</span>
		</button>
	</section>
	<!-- /content -->
</div>
<script src="js/classie.js"></script>
<script src="js/dynamics.min.js"></script>
<script src="js/main.js"></script>

The CSS

/* Helper classes */
html,
body {
	overflow: hidden;
	height: 100%;
}

.container {
	position: relative;
	overflow: hidden;
	overflow-y: scroll;
	width: 100%;
	height: 100%;
	-webkit-overflow-scrolling: touch;
}

.noscroll .container {
	overflow-y: hidden;
}

.slider {
	position: relative;
	z-index: 200;
	width: 100%;
	margin: 0 auto;
	padding: 0 0 7em;
	text-align: center;
	-webkit-user-select: none;
	-moz-user-select: none;
	-ms-user-select: none;
	user-select: none;
	-webkit-touch-callout: none;
	-khtml-user-select: none;
}

.slide {
	position: absolute;
	top: 0;
	visibility: hidden;
	width: 100%;
	opacity: 0;
}

.slide--current {
	position: relative;
	z-index: 100;
	visibility: visible;
	opacity: 1;
}

.slide__mover {
	position: relative;
	z-index: 100;
}

.slide__title {
	font-size: 1.75em;
	font-weight: normal;
	margin: 0 auto;
	padding: 1em 0 0 0;
}

.slide__title span {
	font-size: 55%;
	font-weight: bold;
	display: block;
	letter-spacing: 2px;
	text-transform: uppercase;
	color: #35303d;
}

.slider__nav {
	position: absolute;
	bottom: 2em;
	width: 100%;
	text-align: center;
}

.button {
	font-size: 1.31em;
	position: relative;
	display: inline-block;
	overflow: hidden;
	margin: 0 25px;
	padding: 0;
	cursor: pointer;
	color: #5c5edc;
	border: none;
	background: none;
}

.button:focus {
	outline: none;
}

.button:hover {
	color: #fff;
}

.text-hidden {
	position: absolute;
	top: 200%;
}

.button--close {
	font-size: 1.55em;
	position: absolute;
	top: 30px;
	right: 30px;
	margin: 0;
	opacity: 0;
	color: #50505a;
	-webkit-transition: opacity 0.3s;
	transition: opacity 0.3s;
}

.content--open .button--close {
	opacity: 1;
}

/* Zoomer */
.zoomer {
	position: relative;
	height: 360px; /* this is needed for IE10 so that vertical flexbox centering works */
}

.flex-center {
	display: -webkit-flex;
	display: -ms-flexbox;
	display: flex;
	-webkit-align-items: center;
	-ms-flex-align: center;
	align-items: center;
	-webkit-justify-content: center;
	-ms-flex-pack: center;
	justify-content: center;
}

.zoomer__image {
	display: block;
	margin: 0;
	-webkit-flex: none;
	-ms-flex: none;
	flex: none;
}

.zoomer__area,
.preview {
	position: absolute;
	top: 50%;
	left: 50%;
	-webkit-transform: translate3d(-50%,-50%,0);
	transform: translate3d(-50%,-50%,0);
}

.zoomer__area:focus {
	outline: none;
}

.zoomer__area--size-1 {
	/* Apple Watch */
	width: 96px;
	height: 118px;
}

.zoomer__area--size-2 {
	/* iPhone */
	width: 112px;
	height: 198px;
}

.zoomer__area--size-3 {
	/* MacBook */
	width: 315px;
	height: 200px;
}

.zoomer__area--size-4 {
	/* iPad */
	width: 150px;
	height: 200px;
}

.zoomer__area--size-5 {
	/* iMac */
	width: 315px;
	height: 189px;
}

.preview {
	overflow: hidden;
	background: #18191b;
}

.preview img {
	display: block;
	border-radius: inherit;
	-webkit-transform: translate3d(0,0,0);
	transform: translate3d(0,0,0);
}

.zoomer--active .preview img {
	-webkit-transform: translate3d(100%,0,0);
	transform: translate3d(100%,0,0);
}

.rounded {
	border-radius: 15px;
}

.rounded-right {
	border-radius: 0 15px 15px 0;
}

.preview__content {
	position: absolute;
	top: 0;
	left: 100%;
	width: 100%;
	height: 100%;
	border-radius: inherit;
}
/* Content */
.content {
	position: fixed;
	z-index: 1000;
	top: 0;
	left: -100%;
	overflow: hidden;
	overflow-y: scroll;
	width: 100%;
	height: 100vh;
	background: #18191b;
	-webkit-overflow-scrolling: touch;
}

.content--open {
	left: 0;
}

.content__item {
	position: absolute;
	top: 0;
	display: -webkit-flex;
	display: -ms-flexbox;
	display: flex;
	overflow: hidden;
	height: 0;
	min-height: 100%;
	margin: 0 auto;
	padding: 2em 0;
	pointer-events: none;
	opacity: 0;
	color: #fff;
	-webkit-align-items: center;
	-ms-flex-align: center;
	align-items: center;
}

.content__item--current {
	pointer-events: auto;
	opacity: 1;
}

.content__item--reset {
	height: auto;
}

.content h2 {
	font-size: 3.5em;
	font-weight: normal;
	margin: 0;
}

.content h3 {
	font-size: 1.95em;
	font-weight: normal;
	margin: 0.25em 0 0.5em;
	color: #685884;
}

.content p {
	font-size: 1.25em;
	line-height: 1.5;
}

.content__item-img {
	display: block;
	max-width: 40vw;
	max-height: 80vh;
	-webkit-transform: translate3d(-120%,0,0);
	transform: translate3d(-120%,0,0);
	-webkit-flex: none;
	-ms-flex: none;
	flex: none;
}

.content__item--current .content__item-img {
	-webkit-transform: translate3d(-10px,0,0);
	transform: translate3d(-10px,0,0);
}

.content__item-inner {
	padding: 0 10vw 0;
	opacity: 0;
	-webkit-transform: translate3d(0,50px,0);
	transform: translate3d(0,50px,0);
}

.content__item--current .content__item-inner {
	opacity: 1;
	-webkit-transform: translate3d(0,0,0);
	transform: translate3d(0,0,0);
}

/**************************/
/* All synced transitions */
/**************************/

.zoomer {
	-webkit-transition: -webkit-transform 0.5s;
	transition: transform 0.5s;
	-webkit-transition-timing-function: cubic-bezier(0.7,0,0.3,1);
	transition-timing-function: cubic-bezier(0.7,0,0.3,1);
}

.zoomer.zoomer--notrans {
	-webkit-transition: none;
	transition: none;
}

.zoomer__image {
	-webkit-transition: opacity 0.3s 0.3s;
	transition: opacity 0.3s 0.3s;
}

.zoomer--active .zoomer__image {
	opacity: 0;
	-webkit-transition-delay: 0s;
	transition-delay: 0s;
}

.preview img {
	-webkit-transition: -webkit-transform 0.6s 0.3s;
	transition: transform 0.6s 0.3s;
	-webkit-transition-timing-function: cubic-bezier(0.2,1,0.3,1);
	transition-timing-function: cubic-bezier(0.2,1,0.3,1);
}

.zoomer--active .preview img {
	-webkit-transition: -webkit-transform 0.3s;
	transition: transform 0.3s;
}

.content {
	-webkit-transition: left 0s;
	transition: left 0s;
}

.content__item {
	-webkit-transition: opacity 0s;
	transition: opacity 0s;
}

.content,
.content__item {
	/* delay for content to disappear and zoomer to start transitioning back to 0 */
	-webkit-transition-delay: 0.3s;
	transition-delay: 0.3s;
}

.content--open,
.content__item--current {
	-webkit-transition: none;
	transition: none;
}

.content__item-img {
	-webkit-transition: -webkit-transform 0.4s;
	transition: transform 0.4s;
	-webkit-transition-timing-function: cubic-bezier(0.7,1,0.8,1);
	transition-timing-function: cubic-bezier(0.7,1,0.8,1);
}

.content__item--current .content__item-img {
	-webkit-transition-timing-function: cubic-bezier(0.2,1,0.3,1);
	transition-timing-function: cubic-bezier(0.2,1,0.3,1);
	-webkit-transition-duration: 1s;
	transition-duration: 1s;
}

.content__item-inner {
	-webkit-transition: -webkit-transform 0.6s, opacity 0.3s;
	transition: transform 0.6s, opacity 0.3s;
	-webkit-transition-timing-function: cubic-bezier(0.7,1,0.8,1), ease;
	transition-timing-function: cubic-bezier(0.7,1,0.8,1), ease;
}

.content__item--current .content__item-inner {
	-webkit-transition-timing-function: cubic-bezier(0.2,1,0.3,1), ease;
	transition-timing-function: cubic-bezier(0.2,1,0.3,1), ease;
	-webkit-transition-duration: 1.7s;
	transition-duration: 1.7s;
}

/* Media Queries */
@media screen and (max-width: 50em) {
	.content__item {
		display: block;
	}
	.content__item-img {
		max-width: calc(100% - 80px);
		max-height: 70vh;
	}
	.content h2 {
		font-size: 3em;
	}
	.content__item-inner {
		font-size: 82%;
		padding: 4em 3em 2em;
	}
}

The JavaScript

/**
 * main.js
 * http://www.codrops.com
 *
 * Licensed under the MIT license.
 * http://www.opensource.org/licenses/mit-license.php
 * 
 * Copyright 2015, Codrops
 * http://www.codrops.com
 */
;(function(window) {

	'use strict';

	var bodyEl = document.body, 
		docElem = window.document.documentElement,
		support = { transitions: Modernizr.csstransitions },
		// transition end event name
		transEndEventNames = { 'WebkitTransition': 'webkitTransitionEnd', 'MozTransition': 'transitionend', 'OTransition': 'oTransitionEnd', 'msTransition': 'MSTransitionEnd', 'transition': 'transitionend' },
		transEndEventName = transEndEventNames[ Modernizr.prefixed( 'transition' ) ],
		onEndTransition = function( el, callback ) {
			var onEndCallbackFn = function( ev ) {
				if( support.transitions ) {
					if( ev.target != this ) return;
					this.removeEventListener( transEndEventName, onEndCallbackFn );
				}
				if( callback && typeof callback === 'function' ) { callback.call(this); }
			};
			if( support.transitions ) {
				el.addEventListener( transEndEventName, onEndCallbackFn );
			}
			else {
				onEndCallbackFn();
			}
		},
		// window sizes
		win = {width: window.innerWidth, height: window.innerHeight},
		// some helper vars to disallow scrolling
		lockScroll = false, xscroll, yscroll,
		scrollContainer = document.querySelector('.container'),
		// the main slider and its items
		sliderEl = document.querySelector('.slider'),
		items = [].slice.call(sliderEl.querySelectorAll('.slide')),
		// total number of items
		itemsTotal = items.length,
		// navigation controls/arrows
		navRightCtrl = sliderEl.querySelector('.button--nav-next'),
		navLeftCtrl = sliderEl.querySelector('.button--nav-prev'),
		zoomCtrl = sliderEl.querySelector('.button--zoom'),
		// the main content element
		contentEl = document.querySelector('.content'),
		// close content control
		closeContentCtrl = contentEl.querySelector('button.button--close'),
		// index of current item
		current = 0,
		// check if an item is "open"
		isOpen = false,
		isFirefox = typeof InstallTrigger !== 'undefined',
		// scale body when zooming into the items, if not Firefox (the performance in Firefox is not very good)
		bodyScale = isFirefox ? false : 3;

	// some helper functions:
	function scrollX() { return window.pageXOffset || docElem.scrollLeft; }
	function scrollY() { return window.pageYOffset || docElem.scrollTop; }
	// from http://www.sberry.me/articles/javascript-event-throttling-debouncing
	function throttle(fn, delay) {
		var allowSample = true;

		return function(e) {
			if (allowSample) {
				allowSample = false;
				setTimeout(function() { allowSample = true; }, delay);
				fn(e);
			}
		};
	}

	function init() {
		initEvents();
	}

	// event binding
	function initEvents() {
		// open items
		zoomCtrl.addEventListener('click', function() {
			openItem(items[current]);
		});

		// close content
		closeContentCtrl.addEventListener('click', closeContent);

		// navigation
		navRightCtrl.addEventListener('click', function() { navigate('right'); });
		navLeftCtrl.addEventListener('click', function() { navigate('left'); });

		// window resize
		window.addEventListener('resize', throttle(function(ev) {
			// reset window sizes
			win = {width: window.innerWidth, height: window.innerHeight};

			// reset transforms for the items (slider items)
			items.forEach(function(item, pos) {
				if( pos === current ) return;
				var el = item.querySelector('.slide__mover');
				dynamics.css(el, { translateX: el.offsetWidth });
			});
		}, 10));

		// keyboard navigation events
		document.addEventListener( 'keydown', function( ev ) {
			if( isOpen ) return; 
			var keyCode = ev.keyCode || ev.which;
			switch (keyCode) {
				case 37:
					navigate('left');
					break;
				case 39:
					navigate('right');
					break;
			}
		} );
	}

	// opens one item
	function openItem(item) {
		if( isOpen ) return;
		isOpen = true;

		// the element that will be transformed
		var zoomer = item.querySelector('.zoomer');
		// slide screen preview
		classie.add(zoomer, 'zoomer--active');
		// disallow scroll
		scrollContainer.addEventListener('scroll', noscroll);
		// apply transforms
		applyTransforms(zoomer);
		// also scale the body so it looks the camera moves to the item.
		if( bodyScale ) {
			dynamics.animate(bodyEl, { scale: bodyScale }, { type: dynamics.easeInOut, duration: 500 });
		}
		// after the transition is finished:
		onEndTransition(zoomer, function() {
			// reset body transform
			if( bodyScale ) {
				dynamics.stop(bodyEl);
				dynamics.css(bodyEl, { scale: 1 });
				
				// fix for safari (allowing fixed children to keep position)
				bodyEl.style.WebkitTransform = 'none';
				bodyEl.style.transform = 'none';
			}
			// no scrolling
			classie.add(bodyEl, 'noscroll');
			classie.add(contentEl, 'content--open');
			var contentItem = document.getElementById(item.getAttribute('data-content'))
			classie.add(contentItem, 'content__item--current');
			classie.add(contentItem, 'content__item--reset');

			// reset zoomer transform - back to its original position/transform without a transition
			classie.add(zoomer, 'zoomer--notrans');
			zoomer.style.WebkitTransform = 'translate3d(0,0,0) scale3d(1,1,1)';
			zoomer.style.transform = 'translate3d(0,0,0) scale3d(1,1,1)';
		});
	}

	// closes the item/content
	function closeContent() {
		var contentItem = contentEl.querySelector('.content__item--current'),
			zoomer = items[current].querySelector('.zoomer');

		classie.remove(contentEl, 'content--open');
		classie.remove(contentItem, 'content__item--current');
		classie.remove(bodyEl, 'noscroll');
				
		if( bodyScale ) {
			// reset fix for safari (allowing fixed children to keep position)
			bodyEl.style.WebkitTransform = '';
			bodyEl.style.transform = '';
		}

		/* fix for safari flickering */
		var nobodyscale = true;
		applyTransforms(zoomer, nobodyscale);
		/* fix for safari flickering */

		// wait for the inner content to finish the transition
		onEndTransition(contentItem, function(ev) {
			classie.remove(this, 'content__item--reset');
			
			// reset scrolling permission
			lockScroll = false;
			scrollContainer.removeEventListener('scroll', noscroll);

			/* fix for safari flickering */
			zoomer.style.WebkitTransform = 'translate3d(0,0,0) scale3d(1,1,1)';
			zoomer.style.transform = 'translate3d(0,0,0) scale3d(1,1,1)';
			/* fix for safari flickering */
			
			// scale up - behind the scenes - the item again (without transition)
			applyTransforms(zoomer);
			
			// animate/scale down the item
			setTimeout(function() {	
				classie.remove(zoomer, 'zoomer--notrans');
				classie.remove(zoomer, 'zoomer--active');
				zoomer.style.WebkitTransform = 'translate3d(0,0,0) scale3d(1,1,1)';
				zoomer.style.transform = 'translate3d(0,0,0) scale3d(1,1,1)';
			}, 25);

			if( bodyScale ) {
				dynamics.css(bodyEl, { scale: bodyScale });
				dynamics.animate(bodyEl, { scale: 1 }, {
					type: dynamics.easeInOut,
					duration: 500
				});
			}

			isOpen = false;
		});
	}

	// applies the necessary transform value to scale the item up
	function applyTransforms(el, nobodyscale) {
		// zoomer area and scale value
		var zoomerArea = el.querySelector('.zoomer__area'), 
			zoomerAreaSize = {width: zoomerArea.offsetWidth, height: zoomerArea.offsetHeight},
			zoomerOffset = zoomerArea.getBoundingClientRect(),
			scaleVal = zoomerAreaSize.width/zoomerAreaSize.height < win.width/win.height ? win.width/zoomerAreaSize.width : win.height/zoomerAreaSize.height;

		if( bodyScale && !nobodyscale ) {
			scaleVal /= bodyScale; 
		}

		// apply transform
		el.style.WebkitTransform = 'translate3d(' + Number(win.width/2 - (zoomerOffset.left+zoomerAreaSize.width/2)) + 'px,' + Number(win.height/2 - (zoomerOffset.top+zoomerAreaSize.height/2)) + 'px,0) scale3d(' + scaleVal + ',' + scaleVal + ',1)';
		el.style.transform = 'translate3d(' + Number(win.width/2 - (zoomerOffset.left+zoomerAreaSize.width/2)) + 'px,' + Number(win.height/2 - (zoomerOffset.top+zoomerAreaSize.height/2)) + 'px,0) scale3d(' + scaleVal + ',' + scaleVal + ',1)';
	}

	// navigate the slider
	function navigate(dir) {
		var itemCurrent = items[current],
			currentEl = itemCurrent.querySelector('.slide__mover'),
			currentTitleEl = itemCurrent.querySelector('.slide__title');

		// update new current value
		if( dir === 'right' ) {
			current = current < itemsTotal-1 ? current + 1 : 0;
		}
		else {
			current = current > 0 ? current - 1 : itemsTotal-1;
		}

		var itemNext = items[current],
			nextEl = itemNext.querySelector('.slide__mover'),
			nextTitleEl = itemNext.querySelector('.slide__title');
		
		// animate the current element out
		dynamics.animate(currentEl, { opacity: 0, translateX: dir === 'right' ? -1*currentEl.offsetWidth/2 : currentEl.offsetWidth/2, rotateZ: dir === 'right' ? -10 : 10 }, {
			type: dynamics.spring,
			duration: 2000,
			friction: 600,
			complete: function() {
				dynamics.css(itemCurrent, { opacity: 0, visibility: 'hidden' });
			}
		});

		// animate the current title out
		dynamics.animate(currentTitleEl, { translateX: dir === 'right' ? -250 : 250, opacity: 0 }, {
			type: dynamics.bezier,
			points: [{"x":0,"y":0,"cp":[{"x":0.2,"y":1}]},{"x":1,"y":1,"cp":[{"x":0.3,"y":1}]}],
			duration: 450
		});

		// set the right properties for the next element to come in
		dynamics.css(itemNext, { opacity: 1, visibility: 'visible' });
		dynamics.css(nextEl, { opacity: 0, translateX: dir === 'right' ? nextEl.offsetWidth/2 : -1*nextEl.offsetWidth/2, rotateZ: dir === 'right' ? 10 : -10 });

		// animate the next element in
		dynamics.animate(nextEl, { opacity: 1, translateX: 0 }, {
			type: dynamics.spring,
			duration: 2000,
			friction: 600,
			complete: function() {
				items.forEach(function(item) { classie.remove(item, 'slide--current'); });
				classie.add(itemNext, 'slide--current');
			}
		});

		// set the right properties for the next title to come in
		dynamics.css(nextTitleEl, { translateX: dir === 'right' ? 250 : -250, opacity: 0 });
		// animate the next title in
		dynamics.animate(nextTitleEl, { translateX: 0, opacity: 1 }, {
			type: dynamics.bezier,
			points: [{"x":0,"y":0,"cp":[{"x":0.2,"y":1}]},{"x":1,"y":1,"cp":[{"x":0.3,"y":1}]}],
			duration: 650
		});
	}

	// disallow scrolling (on the scrollContainer)
	function noscroll() {
		if(!lockScroll) {
			lockScroll = true;
			xscroll = scrollContainer.scrollLeft;
			yscroll = scrollContainer.scrollTop;
		}
		scrollContainer.scrollTop = yscroll;
		scrollContainer.scrollLeft = xscroll;
	}

	init();

})(window);