Make a code

<div class="demo demo--wide">
  <div class="demo-split">
    <div class="demo-controls">
      <label class="demo-label" for="value">What it carries</label>
      <input class="demo-input" id="value" value="https://devix.pk/resources/qr-code">

      <div class="demo-row">
        <label class="demo-label" for="level">Correction</label>
        <div class="demo-seg" id="level" role="group" aria-label="Error correction">
          <button type="button" data-level="L">L</button>
          <button type="button" data-level="M" aria-pressed="true">M</button>
          <button type="button" data-level="Q">Q</button>
          <button type="button" data-level="H">H</button>
        </div>
      </div>

      <div class="demo-row">
        <label class="demo-label" for="logo">Logo</label>
        <input id="logo" type="range" min="0" max="0.3" step="0.01" value="0">
        <output id="logoOut">off</output>
      </div>

      <div class="demo-row">
        <div class="demo-seg" id="shape" role="group" aria-label="Module shape">
          <button type="button" data-shape="square" aria-pressed="true">Square</button>
          <button type="button" data-shape="rounded">Rounded</button>
          <button type="button" data-shape="dot">Dots</button>
        </div>
        <button class="demo-btn" id="png">Download PNG</button>
      </div>

      <dl class="demo-kv" id="facts"></dl>
    </div>

    <div id="code"></div>
  </div>
</div>

import { createQrCode } from 'https://devix.pk/cdn/oss/qr-code@1.0.0/index.js';

// Drawn here so the demo needs nothing from the network.
const LOGO = `<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
  <rect width="100" height="100" rx="22" fill="#0ea5e9"/>
  <path d="M28 70V30h18a20 20 0 0 1 0 40H28Zm14-10h4a10 10 0 0 0 0-20h-4v20Z" fill="#fff"/>
</svg>`;

const value = document.getElementById('value');
const logo = document.getElementById('logo');
const logoOut = document.getElementById('logoOut');
const facts = document.getElementById('facts');

let level = 'M';
let shape = 'square';

const qr = createQrCode(document.getElementById('code'), {
  value: value.value,
  level,
  onRender: (code) => {
    facts.innerHTML = `
      <div><dt>version</dt><dd>${code.version} · ${code.size} × ${code.size}</dd></div>
      <div><dt>mode</dt><dd>${code.mode}</dd></div>
      <div><dt>correction</dt><dd>${code.level}${code.level !== level ? ' (raised for the logo)' : ''}</dd></div>
      <div><dt>mask</dt><dd>${code.mask}</dd></div>`;
  },
});

const apply = () => {
  const size = Number(logo.value);
  logoOut.textContent = size ? `${Math.round(size * 100)}% of the width` : 'off';
  qr.setOptions({
    value: value.value || ' ',
    level,
    shape,
    logo: size ? { src: LOGO, size } : undefined,
  });
};

value.addEventListener('input', apply);
logo.addEventListener('input', apply);

for (const [id, set] of [['level', (v) => (level = v)], ['shape', (v) => (shape = v)]]) {
  document.getElementById(id).addEventListener('click', (event) => {
    const button = event.target.closest('button');
    if (!button) return;
    for (const other of event.currentTarget.querySelectorAll('button')) other.setAttribute('aria-pressed', String(other === button));
    set(button.dataset.level ?? button.dataset.shape);
    apply();
  });
}

document.getElementById('png').addEventListener('click', () => qr.download('devix-qr.png'));
apply();

@import url('https://devix.pk/cdn/oss/qr-code@1.0.0/qr-code.min.css');

.demo-split { display: flex; flex-wrap: wrap; gap: 24px; align-items: flex-start; }
.demo-controls { flex: 1 1 260px; display: grid; gap: 12px; align-content: start; }
.demo-label { display: block; margin-bottom: 6px; }
.demo-row { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; }
.demo-row input[type='range'] { flex: 1; min-width: 100px; }
#logoOut { font: 11.5px var(--demo-mono); color: var(--demo-muted); }
.dxq { flex: 0 0 auto; --dxq-max-width: 220px; }