My-HTML-CSS-JAVASCRIPT-Mini-Projects/lazyloadingimg.html at main · KalamPinjar/My-HTML-CSS-JAVASCRIPT-Mini-Projects · GitHub

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            padding: 0;
            margin: 0;
            box-sizing: border-box;
        }


        .wrapper {
            display: flex;
            justify-content: flex-start;
            align-items: center;
            overflow: hidden;
            height: 100vh;
        }

        .bg {
            background: url(images/green-gallary/drops-green.jpg) no-repeat center center/cover;
            position: absolute;
            top: 20px;
            left: 30px;
            width: calc(50vw - 60px);
            /* height: calc(50vh - 60px); */
            aspect-ratio: 12/9;
            z-index: -1;
            filter: blur(0);

        }

        /* .loading-text {
            font-size: 2rem;
            color: black;
        } */

        .space {
            display: flex;
            justify-content: center;
            align-items: center;
            background: #000;
            color: white;
            height: 100vh;
        }
    </style>
</head>

<body>
    <div class="wrapper">
        <section class="bg"></section>
        <!-- <div class="loading-text">0%</div> -->

    </div>
    <div class="space">
        <h1>heeee</h1>
    </div>


    <script>

        //let loadText = document.querySelector(".loading-text");
        let bg = document.querySelector(".bg");

        let load = 0;
        let int = setInterval(blurring, 30);

        function blurring() {
            load++;
            if (load > 99) {
                clearInterval(int);
            }

            //loadText.innerText = `${load}%`;
            //loadText.style.opacity = scale(load, 0, 100, 1, 0);
            bg.style.filter = `blur(${scale(load, 0, 100, 30, 0)}px)`;
        }

        const scale = (num, in_min, in_max, out_min, out_max) => {
            return ((num - in_min) * (out_max - out_min)) / (in_max - in_min) + out_min;
        };
    </script>
</body>

</html>