JavaScript-learning/mousetrail.html at master · HaileeBui/JavaScript-learning · GitHub

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

<head>
    <meta charset="utf-8" />
    <title>Mousetrail</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, shink-to-fit=no">
</head>

<body>
    <style>
        .trail {
            /* className for the trail elements */
            position: absolute;
            height: 6px;
            width: 6px;
            border-radius: 3px;
            background: teal;
        }

        body {
            height: 300px;
        }
    </style>

    <script>
        'use strict';
        const divArray = [];  //create array to store dots
        const body = document.querySelector('body');

        document.addEventListener('mousemove', (e) => {
            console.log('mouse coordinates: ', e.pageX, e.pageY);

            let numberOfDots = 20;
            if (divArray.length > numberOfDots) { //if over 20, remove the first dot
                const removed = divArray.shift();
                body.removeChild(removed);
            } else {
                let div = document.createElement('div');
                div.className = 'trail';   //add classname for div
                div.style.left = e.clientX + 'px'; //set coordinators
                div.style.top = e.clientY + 'px';
                document.body.appendChild(div);
                divArray.push(div); //add div to array
            }
        }
        );
    </script>
</body>

</html>