JSFiddle - React, Tailwind, and code Playground

by ferares

HTML

<div class="scroll-box">
    <div class="overflow">Tons of content in here...</div>
</div>
<div class="scroll-arrows">
    <div id="arrow-up">Scroll Up</div>
    <div id="arrow-down">Scroll Down</div>
</div>

CSS

.scroll-box {
    max-height: 300px;
    overflow-y: scroll;
    border: 2px solid #000;
    margin-bottom: 20px;
}
.scroll-box .overflow {
    height: 1000px;
    background: #d0e4f7;
    background: url(data:image/svg+xml;
    base64, 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);
    background: -moz-linear-gradient(top, #d0e4f7 0%, #73b1e7 24%, #0a77d5 50%, #539fe1 79%, #87bcea 100%);
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%, #d0e4f7), color-stop(24%, #73b1e7), color-stop(50%, #0a77d5), color-stop(79%, #539fe1), color-stop(100%, #87bcea));
    background: -webkit-linear-gradient(top, #d0e4f7 0%, #73b1e7 24%, #0a77d5 50%, #539fe1 79%, #87bcea 100%);
    background: -o-linear-gradient(top, #d0e4f7 0%, #73b1e7 24%, #0a77d5 50%, #539fe1 79%, #87bcea 100%);
    background: -ms-linear-gradient(top, #d0e4f7 0%, #73b1e7 24%, #0a77d5 50%, #539fe1 79%, #87bcea 100%);
    background: linear-gradient(to bottom, #d0e4f7 0%, #73b1e7 24%, #0a77d5 50%, #539fe1 79%, #87bcea 100%);
    filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#d0e4f7', endColorstr='#87bcea', GradientType=0);
}
.scroll-arrows...

JavaScript

$(function () {
    // use UI arrows in page content to control scrolling
    var scrolling = false;

    $('.scroll-arrows').on('mousedown', 'div', function (evt) {
        scrolling = true;
        startScrolling($('.scroll-box'), 100, evt.target.id);
    });
    
    $(document).mouseup(function () {
      scrolling = false;
    });

    function startScrolling(obj, spd, btn) {
        var travel = (btn.indexOf('up') > -1) ? '-=' + spd + 'px' : '+=' + spd + 'px';
        if (!scrolling) {
            obj.stop();
        } else {
            // recursively call startScrolling while mouse is pressed
            obj.animate({
                "scrollTop": travel
            }, "fast", "linear", function () {
              startScrolling(obj, spd, btn);
            });
        }
    }
});