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Slider with Parallax Animation

11th February

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Source Code
                            <!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<!-- This script got from www.devanswer.com -->


<style>
html,
body {
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
    font-family: "Roboto", "Helvetica", sans-serif;
    transition: background-color 0.2s;
    will-change: background-color;
}

.inspired-by {
    display: block;
    position: relative;
    margin-bottom: 15px;
    text-align: center;
    color: #fff;
    font-size: 14px;
}

.wrapper {
    position: relative;
    overflow-x: hidden;
    width: 100%;
    height: 100%;
}

.card {
    display: block;
    position: absolute;
    top: 25px;
    margin: 0 auto;
    width: 350px;
    background-color: #fff;
    border-radius: 15px;
    box-shadow: 0 30 50 rgba(0, 0, 0, 0.2);
    transform: translateX(-50%);
    transition: left 0.5s ease-out;
    will-change: left;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -o-user-select: none;
    user-select: none;
}

.card--19 {
    left: 50%;
}

.card--solstice,
.card--huarache {
    left: 150%;
}

.card__header {
    position: relative;
    height: 170px;
    padding: 30px 30px 300px;
    border-top-right-radius: 15px;
    border-top-left-radius: 15px;
    color: #fff;
}

.card__header--19 {
    background-color: #F72648;
    background-image: linear-gradient(#F72648, #FCCB3C);
    background: #F72648;
    background: linear-gradient(#F72648, #FCCB3C);
}

.card__header--solstice {
    background-color: #3CA3FC;
    background-image: linear-gradient(#3CA3FC, #FFD300);
    background: #3CA3FC;
    background: linear-gradient(#3CA3FC, #FFD300);
}

.card__header--huarache {
    background-color: #26C9F7;
    background-image: linear-gradient(#26C9F7, #DFFC3C);
    background: #26C9F7;
    background: linear-gradient(#26C9F7, #DFFC3C);
}

.card__watermark {
    overflow: hidden;
    position: absolute;
    bottom: 10px;
    left: 0;
    width: 100%;
}

    .card__watermark::after {
        content: attr(data-watermark);
        position: relative;
        left: -20px;
        color: rgba(0, 0, 0, .3);
        font-size: 240px;
        font-weight: 700;
        text-transform: uppercase;
    }

.card__logo {
    width: 50px;
    height: auto;
}

.card__price {
    float: right;
    font-size: 16px;
    font-weight: 300;
}

.card__title {
    margin: 35px 0 20px;
    font-size: 15px;
    line-height: 1.1em;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.card__subtitle {
    display: block;
    font-size: 13px;
    font-weight: 300;
}

.card__body {
    position: relative;
    padding: 40px 30px 20px;
}

.card__image {
    z-index: 1;
    position: absolute;
    top: -290px;
    left: -30px;
    width: 125%;
    user-select: none;
    -moz-user-select: none;
    -webkit-user-drag: none;
    -webkit-user-select: none;
    -ms-user-select: none;
}

.card__wish-list {
    display: block;
    width: 50%;
    margin: 0 auto 15px;
    padding: 15px;
    border: 2px solid #fff;
    border-radius: 20px;
    text-align: center;
    text-transform: uppercase;
    font-size: 14px;
}

.card__wish-list--19 {
    color: #8850FF;
    border-color: #8850FF;
}

.card__wish-list--solstice {
    color: #FFBA00;
    border-color: #FFBA00;
}

.card__wish-list--huarache {
    color: #26C9F7;
    border-color: #26C9F7;
}

.card__category {
    display: block;
    font-size: 12px;
    color: #AEAEAE;
    text-transform: uppercase;
    text-align: center;
}

.card__will-animate {
    will-change: transform;
}

.cards-placeholder {
    display: block;
    position: relative;
    margin-bottom: 15px;
    text-align: center;
}

.cards-placeholder__item {
    opacity: 0.3;
    display: inline-block;
    margin-right: 10px;
    background-color: #fff;
    width: 30px;
    height: 5px;
    border-radius: 5px;
    transition: opacity 0.2s;
    will-change: opacity;
}

.cards-placeholder__item--active {
    opacity: 1;
}
</style>

</head>
<body>
<link href="https://fonts.googleapis.com/css?family=Roboto:300,400,700" rel="stylesheet"/>
<div class="wrapper">
    <!-- Nike 19 -->
    <div class="card card--19">
    <div class="card__header card__header--19">
        <div class="card__watermark" data-watermark="Air"></div>

        <img src="http://devanswer.com/codes/files/nike.png" alt="Nike" class="card__logo card__will-animate">

        <span class="card__price card__will-animate">$120</span>

        <h1 class="card__title card__will-animate">Air Structure 1</h1>
        <span class="card__subtitle card__will-animate">From the Flymesh upper to the triple-density foam midsole, the Nike Air Zoom Structure 19 Men's Running Shoe offers plenty of support and the response you need for a smooth, stable ride that feels ultra fast.</span>

    </div>

    <div class="card__body">
        <img src="http://devanswer.com/codes/files/nike19.png" alt="Nike 19" class="card__image card__will-animate">
        <div class="card__wish-list card__wish-list--19 card__will-animate">Wish List</div>

        <span class="card__category card__will-animate">Men's running shoe</span>
    </div>
    </div>

    <!-- Nike Solstice -->
    <div class="card card--solstice">
    <div class="card__header card__header--solstice">
        <div class="card__watermark" data-watermark="Classic"></div>

        <img src="http://devanswer.com/codes/files/nike.png" alt="Nike" class="card__logo card__will-animate">

        <span class="card__price card__will-animate">$129</span>

        <h1 class="card__title card__will-animate">Air Solstice QS</h1>
        <span class="card__subtitle card__will-animate">The Nike Air Solstice draws inspiration from the swoosh's classic running shoes of the 1980's updating the style with premium materials and impressive production quality.</span>

    </div>

    <div class="card__body">
        <img src="http://devanswer.com/codes/files/nike-air-solstice.png" alt="Nike Solstice" class="card__image card__will-animate">
        <div class="card__wish-list card__wish-list--solstice card__will-animate">Wish List</div>

        <span class="card__category card__will-animate">Men's shoe</span>
    </div>
    </div>

    <!-- Nike Huarache -->
    <div class="card card--huarache">
    <div class="card__header card__header--huarache">
        <div class="card__watermark" data-watermark="Safari"></div>

        <img src="http://devanswer.com/codes/files/nike.png" alt="Nike" class="card__logo card__will-animate">

        <span class="card__price card__will-animate">$140</span>

        <h1 class="card__title card__will-animate">Air Huarache Utility</h1>
        <span class="card__subtitle card__will-animate">The Nike Air Huarache Utility Men's Shoe toughens up a famous running shoe with a nylon upper, fused mudguard and vibrant detail.</span>

    </div>

    <div class="card__body">
        <img src="http://devanswer.com/codes/files/nike-safari.png" alt="Nike Huarache" class="card__image card__will-animate">
        <div class="card__wish-list card__wish-list--solstice card__will-animate">Wish List</div>

        <span class="card__category card__will-animate">Men's shoe</span>
    </div>
    </div>

</div> <!-- /wrapper -->

<div class="cards-placeholder">
    <div class="cards-placeholder__item"></div>
    <div class="cards-placeholder__item"></div>
    <div class="cards-placeholder__item"></div>
</div><div id="bcl"><a style="font-size:8pt;text-decoration:none;" href="http://www.devanswer.com">Developers Answer</a></div>
<script>
(function () {
    'use strict';

    var BODY_BACKGROUNDS = [
        '#8850FF',
        '#FFBA00',
        '#4054FF'
    ];

    function Slider() {
        this.cards = document.querySelectorAll('.card');
        this.currentIndex = 0;

        this.isDragging = false;
        this.startX = 0;
        this.currentX = 0;

        this.initEvents();
        this.setActivePlaceholder();
    }

    // initialize drag events
    Slider.prototype.initEvents = function () {
        document.addEventListener('touchstart', this.onStart.bind(this));
        document.addEventListener('touchmove', this.onMove.bind(this));
        document.addEventListener('touchend', this.onEnd.bind(this));

        document.addEventListener('mousedown', this.onStart.bind(this));
        document.addEventListener('mousemove', this.onMove.bind(this));
        document.addEventListener('mouseup', this.onEnd.bind(this));

    };

    // set active placeholder
    Slider.prototype.setActivePlaceholder = function () {
        var placeholders = document.querySelectorAll('.cards-placeholder__item');
        var activePlaceholder = document.querySelector('.cards-placeholder__item--active')

        if (activePlaceholder) {
            activePlaceholder.classList.remove('cards-placeholder__item--active');
        }

        placeholders[this.currentIndex].classList.add('cards-placeholder__item--active');

        var bodyEl = document.querySelector('body');
        bodyEl.style.backgroundColor = BODY_BACKGROUNDS[this.currentIndex];
    };

    // mousedown event
    Slider.prototype.onStart = function (evt) {
        this.isDragging = true;

        this.currentX = evt.pageX || evt.touches[0].pageX;
        this.startX = this.currentX;

        var card = this.cards[this.currentIndex];

        // calculate ration to use in parallax effect
        this.windowWidth = window.innerWidth;
        this.cardWidth = card.offsetWidth;
        this.ratio = this.windowWidth / (this.cardWidth / 4);
    };

    // mouseup event
    Slider.prototype.onEnd = function (evt) {
        this.isDragging = false;

        var diff = this.startX - this.currentX;
        var direction = (diff > 0) ? 'left' : 'right';
        this.startX = 0;

        if (Math.abs(diff) > this.windowWidth / 4) {
            if (direction === 'left') {
                this.slideLeft();
            } else if (direction === 'right') {
                this.slideRight();
            } else {
                this.cancelMoveCard();
            }

        } else {
            this.cancelMoveCard();

        }

    };

    // mousemove event
    Slider.prototype.onMove = function (evt) {
        if (!this.isDragging) return;

        this.currentX = evt.pageX || evt.touches[0].pageX;
        var diff = this.startX - this.currentX;
        diff *= -1;

        // don't let drag way from the center more than quarter of window
        if (Math.abs(diff) > this.windowWidth / 4) {
            if (diff > 0) {
                diff = this.windowWidth / 4;
            } else {
                diff = - this.windowWidth / 4;
            }
        }

        this.moveCard(diff);
    };

    // slide to left direction
    Slider.prototype.slideLeft = function () {
        // if last don't do nothing
        if (this.currentIndex === this.cards.length - 1) {
            this.cancelMoveCard();
            return;
        }

        var self = this;
        var card = this.cards[this.currentIndex];
        var cardWidth = this.windowWidth / 2;

        card.style.left = '-50%';

        this.resetCardElsPosition();

        this.currentIndex += 1;
        this.setActivePlaceholder();
        card = this.cards[this.currentIndex];

        card.style.left = '50%';

        this.moveCardEls(cardWidth * 3);

        // add delay to resetting position
        setTimeout(function () {
            self.resetCardElsPosition();
        }, 50);
    };

    // slide to right direction
    Slider.prototype.slideRight = function () {
        // if last don't do nothing
        if (this.currentIndex === 0) {
            this.cancelMoveCard();
            return;
        }

        var self = this;
        var card = this.cards[this.currentIndex];
        var cardWidth = this.windowWidth / 2;

        card.style.left = '150%';

        this.resetCardElsPosition();

        this.currentIndex -= 1;
        this.setActivePlaceholder();
        card = this.cards[this.currentIndex];

        card.style.left = '50%';

        this.moveCardEls(-cardWidth * 3);

        // add delay to resetting position
        setTimeout(function () {
            self.resetCardElsPosition();
        }, 50);
    };

    // put active card in original position (center)
    Slider.prototype.cancelMoveCard = function () {
        var self = this;
        var card = this.cards[this.currentIndex];

        card.style.transition = 'transform 0.5s ease-out';
        card.style.transform = '';

        this.resetCardElsPosition();
    };

    // reset to original position elements of card
    Slider.prototype.resetCardElsPosition = function () {
        var self = this;
        var card = this.cards[this.currentIndex];

        var cardLogo = card.querySelector('.card__logo');
        var cardPrice = card.querySelector('.card__price');
        var cardTitle = card.querySelector('.card__title');
        var cardSubtitle = card.querySelector('.card__subtitle');
        var cardImage = card.querySelector('.card__image');
        var cardWishList = card.querySelector('.card__wish-list');
        var cardCategory = card.querySelector('.card__category');
        var cardWillAnimate = card.querySelectorAll('.card__will-animate');

        // move card elements to original position
        cardWillAnimate.forEach(function (el) {
            el.style.transition = 'transform 0.5s ease-out';
        });

        cardLogo.style.transform = '';
        cardPrice.style.transform = '';

        cardTitle.style.transform = '';
        cardSubtitle.style.transform = '';

        cardImage.style.transform = '';
        cardWishList.style.transform = '';
        cardCategory.style.transform = '';

        // clear transitions
        setTimeout(function () {
            card.style.transform = '';
            card.style.transition = '';

            cardWillAnimate.forEach(function (el) {
                el.style.transition = '';
            });
        }, 500);

    };

    // slide card while dragging
    Slider.prototype.moveCard = function (diff) {

        var card = this.cards[this.currentIndex];

        card.style.transform = 'translateX(calc(' + diff + 'px - 50%))';
        diff *= -1;

        this.moveCardEls(diff);
    };

    // create parallax effect on card elements sliding them
    Slider.prototype.moveCardEls = function (diff) {
        var card = this.cards[this.currentIndex];

        var cardLogo = card.querySelector('.card__logo');
        var cardPrice = card.querySelector('.card__price');
        var cardTitle = card.querySelector('.card__title');
        var cardSubtitle = card.querySelector('.card__subtitle');
        var cardImage = card.querySelector('.card__image');
        var cardWishList = card.querySelector('.card__wish-list');
        var cardCategory = card.querySelector('.card__category');
        var cardWillAnimate = card.querySelectorAll('.card__will-animate');

        cardLogo.style.transform = 'translateX(' + (diff / this.ratio) + 'px)';
        cardPrice.style.transform = 'translateX(' + (diff / this.ratio) + 'px)';

        cardTitle.style.transform = 'translateX(' + (diff / (this.ratio * 0.90)) + 'px)';
        cardSubtitle.style.transform = 'translateX(' + (diff / (this.ratio * 0.85)) + 'px)';

        cardImage.style.transform = 'translateX(' + (diff / (this.ratio * 0.35)) + 'px)';

        cardWishList.style.transform = 'translateX(' + (diff / (this.ratio * 0.85)) + 'px)';
        cardCategory.style.transform = 'translateX(' + (diff / (this.ratio * 0.65)) + 'px)';

    };


    // create slider
    var slider = new Slider();

})();
</script>

</body>
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