QR and barcode scanner

Copyasync function scan() {
  if (!(window.AppMint && AppMint.scanCode)) { alert('Open this page in the app to scan'); return; }
  var r = await AppMint.scanCode();
  if (!r.ok) {
    if (r.code === 'cancelled') return;                          // the user closed the scanner
    if (r.code === 'unavailable') alert('The scanner is not available on this phone');
    else if (r.code === 'busy') alert('A scan is already open');
    else alert('Scan failed: ' + r.message);                     // 'failed'
    return;
  }
  console.log(r.value, r.format, r.type);   // "TICKET-4821", "qr_code", "text"
}

Copyvar r = await AppMint.scanCode({
  formats: ['ean_13', 'ean_8', 'upc_a', 'upc_e'],   // shop barcodes
  manualInput: true,                                // lets the user type the code
  autoZoom: true                                    // default true
});
if (r.ok) lookUpProduct(r.value);

Copyvar r = await AppMint.scanCode({ formats: ['qr_code'] });
if (r.ok) {
  if (r.type === 'url')     openLink(r.url.url);                      // url: { url, title }
  if (r.type === 'wifi')    showWifi(r.wifi.ssid, r.wifi.password, r.wifi.encryption); // 'wpa'|'wep'|'open'
  if (r.type === 'phone')   callNumber(r.phone);                      // a string
  if (r.type === 'email')   writeMail(r.email.address, r.email.subject, r.email.body);
  if (r.type === 'sms')     writeSms(r.sms.phoneNumber, r.sms.message);
  if (r.type === 'geo')     showMap(r.geo.lat, r.geo.lng);
  if (r.type === 'contact') addContact(r.contact.name, r.contact.organization, r.contact.phones, r.contact.emails);
}

Copyif ('TextDetector' in window) scanButton.hidden = false;

Copyfunction setUpReceiptEntry() {
  var canScan = typeof window.TextDetector === 'function';
  document.getElementById('scan-receipt').hidden = !canScan;
  document.getElementById('type-receipt').hidden = canScan;
  if (!canScan) document.getElementById('entry-hint').textContent =
    'Text scanning is not available on this phone. Type the total below.';
}
document.addEventListener('DOMContentLoaded', setUpReceiptEntry);

Copyasync function readLabel(img) {
  if (typeof window.TextDetector !== 'function') return null;
  try {
    var lines = await new TextDetector().detect(img);
    return lines.map(function (l) { return l.rawValue; }).join('\n');
  } catch (e) {
    if (e.name === 'NotSupportedError') showMessage('Text recognition is not available right now.');
    else showMessage('Could not read the label: ' + e.message);
    return null;
  }
}

Copyconst lines = await new TextDetector().detect(document.getElementById('receipt'));
console.log(lines.map((l) => l.rawValue));

Copy<input type="file" id="doc" accept="image/*" capture="environment">
<pre id="out"></pre>
<script>
document.getElementById('doc').addEventListener('change', async function (e) {
  var file = e.target.files[0];
  if (!file || typeof window.TextDetector !== 'function') return;
  try {
    var lines = await new TextDetector().detect(file);
    document.getElementById('out').textContent = lines.map(function (l) { return l.rawValue; }).join('\n');
  } catch (err) {
    document.getElementById('out').textContent = 'Could not read the photo (' + err.name + ')';
  }
});
</script>

Copyasync function highlightLines(img, overlay) {
  if (!img.complete) await new Promise(function (r) { img.onload = r; });
  var lines = await new TextDetector().detect(img);
  var sx = img.clientWidth / img.naturalWidth, sy = img.clientHeight / img.naturalHeight;
  overlay.innerHTML = '';
  lines.forEach(function (l) {
    var b = l.boundingBox, box = document.createElement('div');
    box.className = 'ocr-box';
    box.title = l.rawValue;
    box.style.cssText = 'position:absolute;left:' + b.x * sx + 'px;top:' + b.y * sy +
      'px;width:' + b.width * sx + 'px;height:' + b.height * sy + 'px';
    overlay.appendChild(box);
  });
}

Copyasync function findTotal(img) {
  try {
    var lines = await new TextDetector().detect(img);
    var hit = lines.find(function (l) { return /total/i.test(l.rawValue); });
    var m = hit && hit.rawValue.match(/(\d+[.,]\d{2})/);
    return m ? parseFloat(m[1].replace(',', '.')) : null;
  } catch (e) {
    if (e.name === 'SecurityError') console.warn('Image is from another origin; load it from the app instead.');
    else console.warn('OCR failed:', e.name, e.message);
    return null;
  }
}

Copyasync function scanTicket() {
  if (!(window.AppMint && AppMint.scanCode)) { alert('Open this page in the app to scan'); return; }
  var r = await AppMint.scanCode({ formats: ['qr_code'] });
  if (r.ok) checkTicket(r.value);                  // r.format, r.type, r.displayValue…
  else if (r.code !== 'cancelled') alert('Scan failed (' + r.code + ')');
}

Copyasync function scanWifi() {
  if (!(window.AppMint && AppMint.scanCode)) return;
  var r = await AppMint.scanCode({ formats: ['qr_code'] });
  if (!r.ok) { if (r.code !== 'cancelled') alert('Scan failed (' + r.code + ')'); return; }
  if (r.type !== 'wifi') { alert('That is not a Wi-Fi code.'); return; }
  showWifiCard(r.wifi.ssid, r.wifi.password, r.wifi.encryption);   // encryption: 'wpa' | 'wep' | 'open'
}

Copyasync function scanProduct() {
  if (!(window.AppMint && AppMint.scanCode)) { showManualEntry(); return; }
  var r = await AppMint.scanCode({ formats: ['ean_13', 'ean_8', 'upc_a', 'upc_e'], manualInput: true });
  if (r.ok) return lookUpProduct(r.value, r.format);            // e.g. '4006381333931', 'ean_13'
  if (r.code === 'busy') return;                                  // a scan is already open
  if (r.code === 'unavailable') alert('The scanner is not available: ' + r.message);
  else if (r.code !== 'cancelled') alert('Scan failed (' + r.code + ')');
}

Copyasync function scanAndOpen() {
  var r = await AppMint.scanCode({ formats: ['qr_code'], autoZoom: true });
  if (!r.ok) return;
  if (r.type === 'url') location.href = r.url.url;
  else if (r.type === 'phone') location.href = 'tel:' + r.phone;
  else if (r.type === 'email') location.href = 'mailto:' + r.email.address;
  else if (r.type === 'geo') showOnMap(r.geo.lat, r.geo.lng);
  else if (r.type === 'contact') saveContact(r.contact.name, r.contact.phones, r.contact.emails);
  else showText(r.displayValue);
}