learnJavaScript/infinityPage.html at main · mikebars1995/learnJavaScript · GitHub

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<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <style>
        body {
            padding: 20px;
        }

        #arrowTop {
            height: 9px;
            width: 14px;
            color: green;
            position: fixed;
            top: 10px;
            left: 10px;
            cursor: pointer;
        }

        #arrowTop::before {
            content: '▲';
        }
    </style>
</head>

<body>
    <div id="arrowTop"></div>


    <h1>Прокрути меня</h1>

    <script>
        arrowTop.onclick = function () {
            window.scrollTo(pageXOffset, 0);
        };

        window.addEventListener('scroll', function () {
            console.log(`${pageYOffset} + ${document.documentElement.clientHeight}`)
            arrowTop.hidden = pageYOffset < document.documentElement.clientHeight;
        });

        function populate() {
            while (true) {
                let windowRelativeBottom = document.documentElement.getBoundingClientRect().bottom;
                if (windowRelativeBottom > document.documentElement.clientHeight + 100) break;
                document.body.insertAdjacentHTML("beforeend", `<p>Date: ${new Date()}</p>`);
            }
        }

        window.addEventListener('scroll', populate);

        populate(); // инициализация документа
    </script>

</body>

</html>