evert.github.com/stacks.html at main · evert/evert.github.com · GitHub

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<!DOCTYPE html>
<head>

  <meta name="viewport" content="width=device-width,minimum-scale=1" />
  <title>Stacks</title>


  <style>
    body {
      font-family: arial;
      background: #4E598C;
      display: flex;
      flex-direction: column;
    }
    body > * {
      margin: 0 auto;
      padding-bottom: 10px;
    }
    .money, #time {
      color: #F9C784;
      font-size: 50px;
    }
    button {
      font-size: 30px;
      box-shadow: 2px 2px 10px #000;
      line-height: 30px;
      padding: 5px;
      background: #FF8C42;
      color: white;
      border: 0;
      border-radius: 5px;
    }
  </style>

</head>

<body>

  <div class="money">
    $
    <span id="amount">0.00</span>
    CAD
  </div>

  <div id="time">
    0:00:00
  </div>

  <button id="btn" onclick="startTimer()">Start</start>

</body>

<script>

  let startTime = null;
  let interval;

  const usdPerHour = 750;
  const cadPerHour = 1.34 * 750;
  const cadPerMillisecond = cadPerHour / 3600_000;

  function startTimer() {

    startTime = Date.now();
    interval = setInterval(tick, 10);
    document.getElementById('btn').style.display = 'none';

  }

  function tick() {

    const timePassed = Date.now() - startTime;
    if (timePassed >= 3600_000) {
      setValues(3600_000);
      clearInterval(interval);
      return;
    }

    setValues(timePassed);


  }

  function setValues(timePassed) {

    let timeStr;
    if (timePassed === 3600_000) {
      timeStr = '1:00:00';
    } else {
      timeStr = '0:' + Math.floor(timePassed / 60_000).toString().padStart(2, '0') + ':' + Math.floor((timePassed / 1000) % 60).toString().padStart(2, '0');
    }
    document.getElementById('amount').innerText = (timePassed * cadPerMillisecond).toFixed(2);
    document.getElementById('time').innerText = timeStr;

  }


</script>