Simple one page scroll example

by Alexey Zuev

HTML

<div class="pages">
    <div class="page current">
        <div class="page__content">Page 1</div>
    </div>
    <div class="page">
        <div class="page__content">Page 2</div>
    </div>
    <div class="page">
        <div class="page__content">Page 3</div>
    </div>
    <div class="page">
        <div class="page__content">Page 4</div>
    </div>
    <div class="page">
        <div class="page__content">The end</div>
    </div>
</div>

CSS

html, 
body, 
.pages {
    height: 100%;
}
body {
    background: #000;
    margin: 0;
    overflow: hidden;
}
.page {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transition: transform .8s, opacity .8s;
    will-change: transform, opacity;
    background-repeat: no-repeat;
    background-position: 50% 50%;
    background-size: cover;
    transform: translateY(100%);
    z-index: 1;
}
.page:after {
    content:"";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, .2);
}
.page.current {
    z-index: 1;
    transform: translateY(0);
}
.page.top {
    opacity: 0;
    transform: scale(.9) translateY(0);
}
.page__content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: #fff;
    font: bold 3rem/1 Sans-serif;
}
.page:nth-child(1) {
    background-image: url(http://wallpaperbeta.com/wallpaper_800x600/leopard_snow_night_animals_800x600_hd-wallpaper-233959.jpg);
}
.page:nth-child(2) {
    background-image: url(http://red-cat23.ru/wp-content/uploads/2013/11/avstriya3.jpg);
}
.page:nth-child(3) {
    background-image: url(http://wallpaperbeta.com/wallpaper_800x600/winter_snow_night_shop_trees_park_lantern_800x600_hd-wallpaper-170998.jpg);
}
.page:nth-child(4) {
    background-image: url(http://f.mypage.ru/04aff0eeee1f6a01f93c93f347015ddd_fb4b653e8460e8ce87250931f9979ce6.jpg);
}
.page:nth-child(5) {
    background-image: url(http://cdn.allwallpaper.in/wallpapers/800x600/14291/paintings-clouds-snow-night-moon-houses-couple-artwork-800x600-wallpaper.jpg);
}

JavaScript

$(function () {
    var $pages = $('.page'),
        pagesCount = $pages.length,
        current = 0,
        animating = false;

    function animate(page) {
        animating = true;
        
        if (page - current > 0) {
            $pages.eq(current).addClass('top');
        } else {
            $pages.eq(page).removeClass('top');
        }
        
        $pages.eq(current).removeClass('current');
        $pages.eq(page).addClass('current');
        
        current = page;
        setTimeout(function () {
            animating = false;
        }, 800);
    }

    function up() {
        if (current > 0) {
            animate(current - 1);
        }
    }

    function down() {
        if (current < pagesCount - 1) {
            animate(current + 1);
        }
    }

    $(document).on("mousewheel DOMMouseScroll", function (e) {
        if (animating) return;
        if (e.originalEvent.wheelDelta > 0 || e.originalEvent.detail < 0) {
            up();
        } else {
            down();
        }
    });
});