moms/index.html at master · Daghall/moms · GitHub

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<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <title>Momsuträknare</title>
    <style>
      body {
        font-family: Arial, sans-serif;
        margin: 0 auto;
        width: 240px;
      }
      legend {
        display: block;
        margin-bottom: 10px;
      }
      legend > div {
        display: inline-block;
        width: 100px;
        font-weight: bold;
        margin-bottom: 5px;
      }
      input {
        width: 100px;
        padding: 5px;
        margin-left: 10px;
        text-align: right;
      }
      input:focus {
        font-weight: bold;
      }
    </style>
  </head>
  <body>
    <form>
      <legend><div>Brutto</div>
        <input id="brutto" type="number" placeholder="125">
      </legend>
      <legend><div>Netto</div>
        <input id="netto" type="number" placeholder="100">
      </legend>
      <legend><div>Moms</div>
        <input id="moms" type="number" placeholder="25">
      </legend>
    </form>

    <script>
      const momsSats = 1.25;
      const brutto = document.getElementById("brutto");
      const netto = document.getElementById("netto");
      const moms = document.getElementById("moms");
      [ brutto, netto, moms].forEach((input) => {
        input.addEventListener("input", () => {
          const b = parseFloat(brutto.value) || 0;
          const n = parseFloat(netto.value) || 0;
          const m = parseFloat(moms.value) || 0;
          if (input === brutto) {
            netto.value = (b / momsSats).toFixed(2);
            moms.value = Math.abs(b - netto.value).toFixed(2);
          } else if (input === netto) {
            brutto.value = (n * momsSats).toFixed(2);
            moms.value = (brutto.value - n).toFixed(2);
          } else if (input === moms) {
            brutto.value = (m / (1 - (1 / momsSats))).toFixed(2);
            netto.value = (brutto.value - m).toFixed(2);
          }
        });
      });
    </script>
  </body>
</html>