hyperHTML/test/exchange.html at master · WebReflection/hyperHTML · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>OpenExchangeRates hyperHTML Demo</title>
    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bulma/0.5.1/css/bulma.min.css">
    <script defer src="https://unpkg.com/hyperhtml@latest/min.js"></script>
    <script defer src="OpenExchangeRates.js"></script>
    <script>
    addEventListener('DOMContentLoaded', () => {
      var hyper = hyperHTML;
      var oer = OpenExchangeRates(API_KEY);
      var render = hyper(document.querySelector('#exchange'));
      var db = JSON.parse(localStorage.getItem('exchange') ||
                          '{"from": "USD", "to": "EUR"}');
      update();
      addEventListener('beforeunload', () => {
        localStorage.setItem('exchange', JSON.stringify(db));
      });

      function convert(amount, from, to) {
        oer.convert(
          parseFloat(db.amount = amount),
          db.from = from,
          db.to = to
        ).then(value => update(db.converted = value));
      }

      function options(selected) {
        return oer.currencies().then(currencies =>
          Object.keys(currencies).map(currency => hyper`
            <option value=${currency} selected=${currency === selected}>
              ${currency}
            </option>`
          ));
      }

      function update() {
        render`
        <div class="field has-addons">
          <p class="control">
            <input
              value=${db.amount}
              oninput=${e => convert(e.currentTarget.value, db.from, db.to)}
              class="input" type="text" placeholder="amount">
          </p>
          <p class="control">
            <span class="select">
              <select disabled
                onchange=${e => convert(db.amount, e.currentTarget.value, db.to)}>
              ${options(db.from)}
              </select>
            </span>
          </p>
        </div>
        <div class="field has-addons">
          <p class="control">
            <input value=${db.converted}
              class="input" type="text" placeholder="converted">
          </p>
          <p class="control">
            <span class="select">
              <select
                onchange=${e => convert(db.amount, db.from, e.currentTarget.value)}>
              ${options(db.to)}
              </select>
            </span>
          </p>
        </div>`;
      }
    }, {once: true});
    </script>
    <style>
      section {
        position: absolute;
        right: 0;
        left: 0;
        bottom: 25%;
      }
      #exchange {
        display: inline-block;
      }
      p.logo {
        margin-top: 25%;
      }
    </style>
  </head>
  <body class="has-text-centered">
    <span id="logo"></span>
    <p class="logo is-size-1">💱</p>
    <p class="is-size-7 has-text-grey-light">
        powered by <a href="https://viperhtml.js.org/">hyper(HTML)</a>
    </p>
    <section>
      <div id="exchange" class="container"></div>
    </section>
    <script>Object.defineProperty(this,'API_KEY',
            {get:()=>atob('MGQxOTU1NWU1N2NiNDJjZGFkOTk4YmQwNjNiMzczN2I=')})</script>
  </body>
</html>