math/index.html at main · acd124/math · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Math</title>
    <meta name="description" content="A simple nostalgic math game">
    <style>
      .row {
        max-width: 30rem;
        display: flex;
        justify-content: space-between;
      }
      .number {
        flex-grow: 1;
        font-size: 10rem;
        text-align: right;
      }
      .operation {
        flex-grow: 0;
      }
      .dividor {
        max-width: 30rem;
        border-top: 0.5rem solid black;
        border-radius: 0.5rem;
      }
      .answer,
      .answer:focus {
        border: none;
        outline: none;
        max-width: 30rem;
        caret-color: transparent;
      }
      .score {
        font-size: 2rem;
      }
      .beside {
        float: left;
      }
      .info {
        margin-left: 4rem;
      }
    </style>
  </head>
  <body>
    <div class="displayBox beside">
      <div class="row">
        <span class="score" id="score">0</span>
        <span class="score" id="timer">00:00</span>
      </div>
      <div class="row">
        <span class="number" id="first"></span>
      </div>
      <div class="row">
        <span class="number operation" id="op"></span>
        <span class="number" id="second"></span>
      </div>
      <div class="dividor"></div>
      <div class="row">
        <input class="answer number" type="text" name="answer" id="answer" autofocus />
      </div>
    </div>
    <div class="beside info">
      <h4>
        URL Parameters
      </h4>
      <ul>
        <li><code>op</code>: math operation. one of +, or x</li>
        <li><code>min</code>: min input number</li>
        <li><code>max</code>: max input number</li>
      </ul>
    </div>
    <script>
      document.getElementById('answer').oninput = checkAnswer;
      document.body.onclick = reselect;
      const params = new URLSearchParams(window.location.search);
      const valRange = [
        !isNaN(parseInt(params.get('min'), 10)) ? parseInt(params.get('min'), 10) : 1,
        !isNaN(parseInt(params.get('max'), 10)) ? parseInt(params.get('max'), 10) : 20
      ];
      const startTime = Date.now();
      let op = params.get('op') ?? '+';
      let inputs, answer;
      let correct = 0;

      const ping = new Audio('./ping.mp3');
      const pong = new Audio('./pong.mp3');
      const dong = new Audio('./dong.mp3');

      function genNext() {
        inputs = Array(2)
          .fill()
          .map(() => ((Math.random() * valRange[1]) | 0) + valRange[0]);
        switch (op) {
          case '+': {
            answer = inputs[0] + inputs[1];
            break;
          }
          case 'x': {
            answer = inputs[0] * inputs[1];
            break;
          }
          default: {
            throw new Error('Unknown operation: ' + op);
          }
        }
        document.getElementById('first').innerText = inputs[0];
        document.getElementById('second').innerText = inputs[1];
        document.getElementById('op').innerText = op;
      }
      function checkAnswer() {
        const box = document.getElementById('answer');
        box.value = box.value.replace(/[^0-9-]/g, '');
        const toCheck = box.value;
        if (answer.toString().length === toCheck.length) {
          box.value = '';
        }
        if (answer.toString() === toCheck) {
          correct += 1;
          document.getElementById('score').innerText = correct;
          if (correct % 10 === 0) {
            ping.currentTime = 0;
            ping.play();
          } else {
            pong.currentTime = 0;
            pong.play();
          }
          genNext();
        } else if (box.value === '') {
          dong.currentTime = 0;
          dong.play();
        }
      }
      function reselect() {
        const toSelect = document.getElementById('answer');
        toSelect.focus();
        toSelect.select();
      }
      genNext();
      reselect();

      setInterval(() => {
        const since = Date.now() - startTime;
        const seconds = Math.floor(since / 1000);
        const minutes = Math.floor(seconds / 60);
        const secs = seconds % 60;
        document.getElementById('timer').innerText = `${minutes.toString().padStart(2, '0')}:${secs
          .toString()
          .padStart(2, '0')}`;
      }, 1000);
    </script>
  </body>
</html>