random-scale/index.html at main · stoptime/random-scale · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Random Scales</title>
    <link rel="apple-touch-icon" sizes="180x180" href="/apple-touch-icon.png">
    <link rel="icon" type="image/png" sizes="32x32" href="/favicon-32x32.png">
    <link rel="icon" type="image/png" sizes="16x16" href="/favicon-16x16.png">
    <link rel="manifest" href="/site.webmanifest">
    <style>
      body {
        background-color: #333;
        color: #ddd;
        font-family: Helvetica, Arial, sans-serif;
        font-size: 1.5em;
        text-align: center;
      }
      ul {
        list-style-type: none;
        padding: 0;
        margin: 1em 0 0;
      }
      li {
        line-height: 1.5em;
        padding: auto 0;
        margin: auto 0;
      }
      button {
        margin-top: 1em;
        padding: .3em 1em;
        border-radius: .5em;
        box-sizing: border-box;
        border-width: 0;
        font-size: .75em;
        color: #333;
      }
      button#shuffle {
        font-size: 1em;
      }
      #timer {
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        width: 100%;
      }
      .green {
        background-color: #009779;
      }
      .orange {
          background-color: #fd950d;
      }
      #clear-button {
          background-color: #D35943;
      }
      #display-timer {
        font-size: .6em;
        color: #aaa;
        border-bottom: 1px solid #444;
        margin: 0 auto .5em;
        width: 300px;
      }
      .arrow {
        font-size: .5em;
      }
      p.stopwatch {
        margin: 0;
        padding: 0;
      }
      #bottomLine {
        border-bottom: 1px solid #444;
        width: 300px;
        margin: 0.5em auto 0;
      }
      .highlight {
        color: yellow;
      }
      li.highlight:focus-visible {
        outline: none;
      }
      /* yeah i hate it too */
      .hide { display: none !important }
      .show { display: block !important }
      .show-flex { display: flex !important }
    </style>
  </head>
  <body>
    <div id="content">
      <div id="display-timer">
        <div id="show-timer" class="show">Show Timer <span class="arrow">&#9660;</span></div>
        <div id="hide-timer" class="hide">Hide Timer <span class="arrow">&#9650;</span></div>
      </div>
      <div id="timer" class="hide">
        <div id="time">
          <div class="control-buttons-wrapper">
            <p class="stopwatch">00:00:00</p>
            <button id="main-button" class="control-buttons green">Start</button>
            <button id="clear-button" class="control-buttons">Clear</button>
          </div>
        </div>
        <div id="bottomLine"></div>
      </div>
      <ul id="keys"></ul>
      <div id="controls">
        <button id="shuffle" type="button">Shuffle</button>
      </div>
    </div>
  </body>
  <script>
    const keys = [ 'C#/Db', 'C', 'Eb/D#', 'E', 'B/Cb', 'A', 'D', 'Ab/G#', 'Bb/A#', 'F', 'G', 'F#/Gb' ];
    const reload = document.querySelector("#shuffle");
    const shuffle = (array) => {
      for (let i = array.length - 1; i > 0; i--) {
        const j = Math.floor(Math.random() * (i + 1));
        [ array[ i ], array[ j ] ] = [ array[ j ], array[ i ] ];
      }
      return array;
    };

    const doShuffle = (keys) => {
      let it = 0;
      for (const key of shuffle(keys)) {
        const node = document.createElement("li");
        node.role = "menuitem";
        node.tabIndex = it === 0 ? "0" : "-1";
        if (it === 0) node.classList.add('highlight');
        const textnode = document.createTextNode(key);
        node.appendChild(textnode);
        document.getElementById("keys").appendChild(node);
        it++;
      }
    }

    window.addEventListener("load", (event) => {
      doShuffle(keys);
      // highlighting options
      document.addEventListener('keydown', (e) => {
        const items = document.querySelectorAll('#keys li');
        let currentIndex = Array.from(items).findIndex(item => item.tabIndex === 0);
        let nextIndex = currentIndex;

        if (e.key === 'ArrowUp') {
          nextIndex = Math.max(0, currentIndex - 1); // Prevent going above the first item
          e.preventDefault(); // Prevent default browser scrolling
        } else if (e.key === 'ArrowDown') {
          nextIndex = Math.min(items.length - 1, currentIndex + 1); // Prevent going below the last item
          e.preventDefault();
        }

        if (nextIndex !== currentIndex) {
          // Remove highlight/focus from current item
          items[ currentIndex ].classList.remove('highlight');
          items[ currentIndex ].tabIndex = -1;

          // Add highlight/focus to the next item
          items[ nextIndex ].classList.add('highlight');
          items[ nextIndex ].tabIndex = 0;
          items[ nextIndex ].focus(); // Programmatically set focus
        }
      });

      handleMouseClick();

    });

    reload.addEventListener("click", () => {
      document.getElementById("keys").innerHTML = "";
      doShuffle(keys);
      handleMouseClick();
    });

    // show/hide timer
    const showTimer = document.getElementById('show-timer');
    const hideTimer = document.getElementById('hide-timer');
    let timer = document.getElementById('timer')

    showTimer.addEventListener('click', function () {
      showTimer.classList.replace('show','hide');
      hideTimer.classList.replace('hide','show');
      timer.classList.replace('hide','show-flex');
    });

    hideTimer.addEventListener('click', function () {
      showTimer.classList.replace('hide','show');
      hideTimer.classList.replace('show','hide');
      timer.classList.replace('show-flex','hide');
    });

    // timer https://github.com/chrislemus/stopwatch-using-javascript
    const time = document.querySelector('.stopwatch')
    const mainButton = document.querySelector('#main-button')
    const clearButton = document.querySelector('#clear-button')
    const stopwatch = {elapsedTime: 0}

    mainButton.addEventListener('click', () => {
      if (mainButton.innerHTML === 'Start') {
        startStopwatch();
        mainButton.innerHTML = 'Stop';
        mainButton.classList.replace('green','orange');
      } else {
        stopwatch.elapsedTime += Date.now() - stopwatch.startTime
        clearInterval(stopwatch.intervalId);
        mainButton.innerHTML = 'Start';
        mainButton.classList.replace('orange', 'green');
      }
    })

    clearButton.addEventListener('click', () => {
      stopwatch.elapsedTime = 0
      stopwatch.startTime = Date.now()
      displayTime(0, 0, 0, 0)
    })

    function startStopwatch() {
      //reset start time
      stopwatch.startTime = Date.now();
      //run `setInterval()` and save id
      stopwatch.intervalId = setInterval(() => {
        //calculate elapsed time
        const elapsedTime = Date.now() - stopwatch.startTime + stopwatch.elapsedTime
        //calculate different time measurements based on elapsed time
        const milliseconds = parseInt((elapsedTime % 1000) / 10)
        const seconds = parseInt((elapsedTime / 1000) % 60)
        const minutes = parseInt((elapsedTime / (1000 * 60)) % 60)
        //display time
        displayTime(minutes, seconds, milliseconds)
      }, 100);
    }

    function displayTime(minutes, seconds, milliseconds) {
      const leadZeroTime = [ minutes, seconds, milliseconds ].map(time => time < 10 ? `0${time}` : time)
      time.innerHTML = leadZeroTime.join(':')
    }

    function handleMouseClick() {
      // Add click handling for mouse users
      document.querySelectorAll('#keys li').forEach((item, index) => {
        item.addEventListener('click', () => {
          // Remove previous highlights
          document.querySelectorAll('#keys li').forEach(li => {
            li.classList.remove('highlight');
            li.tabIndex = -1;
          });

          // Add highlight to clicked item
          item.classList.add('highlight');
          item.tabIndex = 0;
          item.focus();
        });
      });
    }

  </script>
</html>