How Do I Create Fade Animation On Scroll Using CSS

Posted By Bajarangi soft , Posted On 27-11-2020

We can create web page with fade animation for the section on page scroll using html, css and java script .So today we discuss how to do it.

How Do I Create Fade Animation On Scroll Using CSS

Step 1:Create Index.html and implement below code in it.

<section>
    <h1><b>Fade</b> Animation</h1>
    <div class="box" data-animation="fadeIn">
        <img class="image" src="https://cdn.hipwallpaper.com/i/26/67/8jlRQz.jpg" alt="flower"/>
    </div>
    <div class="box" data-animation="fadeIn" data-animation-delay="300ms">
        <img class="image" src="https://cdn.hipwallpaper.com/i/45/83/ykRw6x.jpg" alt="flower"/>
    </div>
    <div class="box" data-animation="fadeIn" data-animation-delay="600ms">
        <img class="image" src="https://cdn.hipwallpaper.com/i/24/39/JDzNlb.jpg" alt="flower"/>
    </div>
    <div class="box" data-animation="fadeIn" data-animation-delay="900ms">
        <img class="image" src="https://cdn.hipwallpaper.com/i/39/82/FRGtQp.jpg" alt="flower"/>
    </div>
</section>

Step 2:Implement css code to do fade animation .

<style>
    @-webkit-keyframes slideInUp {
        0% {
            opacity: 0;
            -webkit-transform: translateY(50%);
            transform: translateY(50%);
        }
        100% {
            opacity: 1;
            -webkit-transform: none;
            transform: none;
        }
    }

    @keyframes slideInUp {
        0% {
            opacity: 0;
            -webkit-transform: translateY(50%);
            transform: translateY(50%);
        }
        100% {
            opacity: 1;
            -webkit-transform: none;
            transform: none;
        }
    }

    @-webkit-keyframes fadeIn {
        0% {
            opacity: 0;
        }
        100% {
            opacity: 1;
        }
    }

    @keyframes fadeIn {
        0% {
            opacity: 0;
        }
        100% {
            opacity: 1;
        }
    }


    [data-animation] {
        opacity: 0;
        -webkit-animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
        animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
        -webkit-animation-fill-mode: both;
        animation-fill-mode: both;
        -webkit-animation-duration: 1s;
        animation-duration: 1s;
    }

    .animations-disabled, .animations-disabled [data-animation] {
        -webkit-animation: none !important;
        animation: none !important;
        opacity: 1 !important;
    }

    .slideInUp {
        -webkit-animation-name: slideInUp;
        animation-name: slideInUp;
    }

    .fadeIn {
        -webkit-animation-name: fadeIn;
        animation-name: fadeIn;
    }

    * {
        box-sizing: border-box;
        line-height: calc(1em + 0.25rem);
    }

    html {
        font: 18px/1.5 'Nunito', sans-serif;
    }

    body {
        margin: 0;
        min-height: 100vh;
        overflow-x: hidden;
        color: rgba(0, 0, 0, .5);
        font-weight: 300;
    }

    h1 {
        width: 100%;
        font-weight: 300;
        text-align: center;
        margin: 0 0 4rem;
        font-size: 3rem;
    }

    b {
        font-weight: 700;
    }

    header, section {
        display: flex;
        flex-wrap: wrap;
        width: 100vw;
        height: 100vh;
        justify-content: space-around;
        align-items: center;
        align-content: center;
        padding: 3rem 1rem;

    }
    header {
        background: url("https://cdn.hipwallpaper.com/i/7/20/pKxaI8.jpg");
        background-repeat: no-repeat;
        background-attachment: fixed;
        background-size: cover;

    }


    header h1 {
        margin: 0;
        color: black;

    }

    header .title {
        font-size: 5rem;
    }

    header .subtitle {
        font-size: 4rem;
    }

    section:nth-child(odd) {
        background: whitesmoke;
    }

    .image {
        width: 15rem;
        height: 15rem;
        margin: 1rem;
        border-radius: 2rem;
        box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
    }

</style>

Step 3:Implement Javacsript to start animation.

<script>
    var Animation = function ({offset} = {offset: 10}) {
        var _elements;

        // Define variables
        var windowTop = offset * window.innerHeight / 100;
        var windowBottom = window.innerHeight - windowTop;
        var windowLeft = 0;
        var windowRight = window.innerWidth;

        function start(element) {
            // Set the attributes to customize
            element.style.animationDelay = element.dataset.animationDelay;
            element.style.animationDuration = element.dataset.animationDuration;
            //set classes to animated
            element.classList.add(element.dataset.animation);
            // Set element to animated
            element.dataset.animated = "true";
        }

        function isElementOnScreen(element) {
            var elementRect = element.getBoundingClientRect();
            var elementTop =
                elementRect.top + parseInt(element.dataset.animationOffset) ||
                elementRect.top;
            var elementBottom =
                elementRect.bottom - parseInt(element.dataset.animationOffset) ||
                elementRect.bottom;
            var elementLeft = elementRect.left;
            var elementRight = elementRect.right;

            return (
                elementTop <= windowBottom &&
                elementBottom >= windowTop &&
                elementLeft <= windowRight &&
                elementRight >= windowLeft
            );
        }


        function checkElementsOnScreen(els = _elements) {
            for (var i = 0, len = els.length; i < len; i++) {
                if (els[i].dataset.animated) continue;

                isElementOnScreen(els[i]) && start(els[i]);
            }
        }


        function update() {
            _elements = document.querySelectorAll(
                "[data-animation]:not([data-animated])"
            );
            checkElementsOnScreen(_elements);
        }


        window.addEventListener("load", update, false);
        window.addEventListener("scroll", () => checkElementsOnScreen(_elements), {passive: true});
        window.addEventListener("resize", () => checkElementsOnScreen(_elements), false);

        return {
            start,
            isElementOnScreen,
            update
        };
    };

    // Initialize
    var options = {
        offset: 20 //percentage of window
    };
    var animation = new Animation(options);
</script>

Complete Code For Creating Fade Animation On Scroll Using CSS.

<!DOCTYPE html>
<html>
<head>
    <title>How Do I Create Fade Animation On Scroll Using CSS</title>
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"/>
    <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Nunito:300,700"/>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>

</head>
<style>
    @-webkit-keyframes slideInUp {
        0% {
            opacity: 0;
            -webkit-transform: translateY(50%);
            transform: translateY(50%);
        }
        100% {
            opacity: 1;
            -webkit-transform: none;
            transform: none;
        }
    }

    @keyframes slideInUp {
        0% {
            opacity: 0;
            -webkit-transform: translateY(50%);
            transform: translateY(50%);
        }
        100% {
            opacity: 1;
            -webkit-transform: none;
            transform: none;
        }
    }

    @-webkit-keyframes fadeIn {
        0% {
            opacity: 0;
        }
        100% {
            opacity: 1;
        }
    }

    @keyframes fadeIn {
        0% {
            opacity: 0;
        }
        100% {
            opacity: 1;
        }
    }


    [data-animation] {
        opacity: 0;
        -webkit-animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
        animation-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
        -webkit-animation-fill-mode: both;
        animation-fill-mode: both;
        -webkit-animation-duration: 1s;
        animation-duration: 1s;
    }

    .animations-disabled, .animations-disabled [data-animation] {
        -webkit-animation: none !important;
        animation: none !important;
        opacity: 1 !important;
    }

    .slideInUp {
        -webkit-animation-name: slideInUp;
        animation-name: slideInUp;
    }

    .fadeIn {
        -webkit-animation-name: fadeIn;
        animation-name: fadeIn;
    }

    * {
        box-sizing: border-box;
        line-height: calc(1em + 0.25rem);
    }

    html {
        font: 18px/1.5 'Nunito', sans-serif;
    }

    body {
        margin: 0;
        min-height: 100vh;
        overflow-x: hidden;
        color: rgba(0, 0, 0, .5);
        font-weight: 300;
    }

    h1 {
        width: 100%;
        font-weight: 300;
        text-align: center;
        margin: 0 0 4rem;
        font-size: 3rem;
    }

    b {
        font-weight: 700;
    }

    header, section {
        display: flex;
        flex-wrap: wrap;
        width: 100vw;
        height: 100vh;
        justify-content: space-around;
        align-items: center;
        align-content: center;
        padding: 3rem 1rem;

    }
    header {
        background: url("https://cdn.hipwallpaper.com/i/7/20/pKxaI8.jpg");
        background-repeat: no-repeat;
        background-attachment: fixed;
        background-size: cover;

    }


    header h1 {
        margin: 0;
        color: black;

    }

    header .title {
        font-size: 5rem;
    }

    header .subtitle {
        font-size: 4rem;
    }

    section:nth-child(odd) {
        background: whitesmoke;
    }

    .image {
        width: 15rem;
        height: 15rem;
        margin: 1rem;
        border-radius: 2rem;
        box-shadow: 0 6px 18px rgba(0, 0, 0, 0.25);
    }

</style>

<body>

<header class="header-sec" data-animation="fadeIn">
    <h1>
        <div class="title" data-animation="slideInUp" data-animation-delay="600ms"><b>Fade</b>  Animation</div>
        <div class="subtitle" data-animation="slideInUp" data-animation-delay="1000ms">On Scroll</div>
    </h1>
</header>

<section>
    <h1><b>Fade</b> Animation</h1>
    <div class="box" data-animation="fadeIn">
        <img class="image" src="https://cdn.hipwallpaper.com/i/26/67/8jlRQz.jpg" alt="flower"/>
    </div>
    <div class="box" data-animation="fadeIn" data-animation-delay="300ms">
        <img class="image" src="https://cdn.hipwallpaper.com/i/45/83/ykRw6x.jpg" alt="flower"/>
    </div>
    <div class="box" data-animation="fadeIn" data-animation-delay="600ms">
        <img class="image" src="https://cdn.hipwallpaper.com/i/24/39/JDzNlb.jpg" alt="flower"/>
    </div>
    <div class="box" data-animation="fadeIn" data-animation-delay="900ms">
        <img class="image" src="https://cdn.hipwallpaper.com/i/39/82/FRGtQp.jpg" alt="flower"/>
    </div>
</section>
</body>
<script>
    var Animation = function ({offset} = {offset: 10}) {
        var _elements;

        // Define variables
        var windowTop = offset * window.innerHeight / 100;
        var windowBottom = window.innerHeight - windowTop;
        var windowLeft = 0;
        var windowRight = window.innerWidth;

        function start(element) {
            // Set the attributes to customize
            element.style.animationDelay = element.dataset.animationDelay;
            element.style.animationDuration = element.dataset.animationDuration;
            //set classes to animated
            element.classList.add(element.dataset.animation);
            // Set element to animated
            element.dataset.animated = "true";
        }

        function isElementOnScreen(element) {
            var elementRect = element.getBoundingClientRect();
            var elementTop =
                elementRect.top + parseInt(element.dataset.animationOffset) ||
                elementRect.top;
            var elementBottom =
                elementRect.bottom - parseInt(element.dataset.animationOffset) ||
                elementRect.bottom;
            var elementLeft = elementRect.left;
            var elementRight = elementRect.right;

            return (
                elementTop <= windowBottom &&
                elementBottom >= windowTop &&
                elementLeft <= windowRight &&
                elementRight >= windowLeft
            );
        }


        function checkElementsOnScreen(els = _elements) {
            for (var i = 0, len = els.length; i < len; i++) {
                if (els[i].dataset.animated) continue;

                isElementOnScreen(els[i]) && start(els[i]);
            }
        }


        function update() {
            _elements = document.querySelectorAll(
                "[data-animation]:not([data-animated])"
            );
            checkElementsOnScreen(_elements);
        }


        window.addEventListener("load", update, false);
        window.addEventListener("scroll", () => checkElementsOnScreen(_elements), {passive: true});
        window.addEventListener("resize", () => checkElementsOnScreen(_elements), false);

        return {
            start,
            isElementOnScreen,
            update
        };
    };

    // Initialize
    var options = {
        offset: 20 //percentage of window
    };
    var animation = new Animation(options);
</script>
</html>

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