Mini-Project/stop_watch.html at main · Rashashajahan/Mini-Project · GitHub

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<!DOCTYPE html>
<html lang="en">
    <title>STOP WATCH</title>
     <header>
            <h1>The STOPWATCH!!</h1>
        </header>
     <style>
html {
    background: linear-gradient(to top left, #336600 0%, #ff0066 100%);
    font-size: 10px;
}

body {
    margin: 0;
    font-size: 2rem;
    display: flex;
    flex: 1;
    min-height: 100vh;
    align-items: center;
}
     * {
    margin: 0;
    padding: 0;
}
.controls {
    position: fixed;
    text-align: center;
    top: 1em;
    width: 100%;
}

.button {
    color: #bbb;
    font-size: 4vw;
    margin: 0 0.5em;
    text-decoration: none;
}

.button:first-child {
        margin-left: 0;
}

.button:last-child {
        margin-right: 0;
}

.button:hover {
    color: white;
}

.stopwatch {
    font-size: 20vw;
    height: 100%;
    line-height: 100vh;
    text-align: center;
}

.results {
    border-color: lime;
    list-style: none;
    margin: 0;
    padding: 0;
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
}
 }
  </style>
 </head>
<body>
   <nav class="controls">
            <a href="#" class="button" onClick="stopwatch.start();">Start</a>
            <a href="#" class="button" onClick="stopwatch.lap();">Lap</a>
            <a href="#" class="button" onClick="stopwatch.stop();">Stop</a>
            <a href="#" class="button" onClick="stopwatch.restart();">Restart</a>
            <a href="#" class="button" onClick="stopwatch.clear();">Clear Laps</a>
        </nav>
        <div class="stopwatch"></div>
        <ul class="results"></ul>
</body>
<script>
class Stopwatch {
    constructor(display, results) {
        this.running = false;
        this.display = display;
        this.results = results;
        this.laps = [];
        this.reset();
        this.print(this.times);
    }

    reset() {
        this.times = [ 0, 0, 0 ];
    }

    start() {
        if (!this.time) this.time = performance.now();
        if (!this.running) {
            this.running = true;
            requestAnimationFrame(this.step.bind(this));
        }
    }

    lap() {
        let times = this.times;
        let li = document.createElement('li');
        li.innerText = this.format(times);
        this.results.appendChild(li);
    }

    stop() {
        this.running = false;
        this.time = null;
    }

    restart() {
        if (!this.time) this.time = performance.now();
        if (!this.running) {
            this.running = true;
            requestAnimationFrame(this.step.bind(this));
        }
        this.reset();
    }

    clear() {
        clearChildren(this.results);
    }

    step(timestamp) {
        if (!this.running) return;
        this.calculate(timestamp);
        this.time = timestamp;
        this.print();
        requestAnimationFrame(this.step.bind(this));
    }

    calculate(timestamp) {
        var diff = timestamp - this.time;
        // Hundredths of a second are 100 ms
        this.times[2] += diff / 10;
        // Seconds are 100 hundredths of a second
        if (this.times[2] >= 100) {
            this.times[1] += 1;
            this.times[2] -= 100;
        }
        // Minutes are 60 seconds
        if (this.times[1] >= 60) {
            this.times[0] += 1;
            this.times[1] -= 60;
        }
    }

    print() {
        this.display.innerText = this.format(this.times);
    }

    format(times) {
        return `\
${pad0(times[0], 2)}:\
${pad0(times[1], 2)}:\
${pad0(Math.floor(times[2]), 2)}`;
    }
}

function pad0(value, count) {
    var result = value.toString();
    for (; result.length < count; --count)
        result = '0' + result;
    return result;
}

function clearChildren(node) {
    while (node.lastChild)
        node.removeChild(node.lastChild);
}

let stopwatch = new Stopwatch(
    document.querySelector('.stopwatch'),
    document.querySelector('.results'));
    </script>
</html>