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docs/examples/datamatrix-image/index.html

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<!doctype html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <meta name="author" content="ZXing for JS">

  <title>ZXing TypeScript | Decoding Data Matrix from image file</title>

  <link rel="stylesheet" rel="preload" as="style" onload="this.rel='stylesheet';this.onload=null"
    href="https://fonts.googleapis.com/css?family=Roboto:300,300italic,700,700italic">
  <link rel="stylesheet" rel="preload" as="style" onload="this.rel='stylesheet';this.onload=null"
    href="https://unpkg.com/normalize.css@8.0.0/normalize.css">
  <link rel="stylesheet" rel="preload" as="style" onload="this.rel='stylesheet';this.onload=null"
    href="https://unpkg.com/milligram@1.3.0/dist/milligram.min.css">
</head>

<body>

  <main class="wrapper" style="padding-top:2em">

    <section class="container" id="demo-content">
      <h1 class="title">Scan Data Matrix from Image</h1>

      <p>
        <a class="button-small button-outline" href="../../index.html">HOME 🏡</a>
      </p>

      <p>
        This example shows how to scan a Data Matrix with ZXing javascript library from an image.
        The example decodes from the
        <code>src</code> in
        <code>img</code> tag, however is also possible to decode directly from an url without an
        <code>img</code> tag.
      </p>

      <div id="datamatrix-1">
        <div>
          <a class="button decodeButton">Decode</a>
        </div>
        <div>
          <img class="img" src="../../resources/blackbox/datamatrix/0123456789.png" style="border: 1px solid gray"></img>
        </div>
        <label>Result:</label>
        <blockquote>
          <p class="result"></p>
        </blockquote>
      </div>

      <div id="datamatrix-2">
        <div>
          <a class="button decodeButton">Decode</a>
        </div>
        <div>
          <img class="img" src="../../resources/blackbox/datamatrix/abcdefg-64x64.png" style="border: 1px solid gray"></img>
        </div>
        <label>Result:</label>
        <blockquote>
          <p class="result"></p>
        </blockquote>
      </div>

      <div id="datamatrix-3">
        <div>
          <a class="button decodeButton">Decode</a>
        </div>
        <div>
          <img class="img" src="../../resources/blackbox/datamatrix/17.png" style="border: 1px solid gray"></img>
        </div>
        <label>Result:</label>
        <blockquote>
          <p class="result"></p>
        </blockquote>
      </div>

      <p>See the <a href="https://github.com/zxing-js/library/tree/master/docs/examples/datamatrix-image/">source code</a>
        for this example.</p>

    </section>

    <footer class="footer">
      <section class="container">
        <p>ZXing TypeScript Demo. Licensed under the <a target="_blank"
            href="https://github.com/zxing-js/library#license" title="MIT">MIT</a>.</p>
      </section>
    </footer>

  </main>

  <script type="text/javascript" src="https://unpkg.com/@zxing/library@latest"></script>
  <script type="text/javascript">
    window.addEventListener('load', function () {
      const codeReader = new ZXing.BrowserDatamatrixCodeReader()
      console.log('ZXing code reader initialized');

      const decodeFun = (e) => {

        const parent = e.target.parentNode.parentNode;
        const img = parent.getElementsByClassName('img')[0].cloneNode(true);
        const resultEl = parent.getElementsByClassName('result')[0];

        codeReader.decodeFromImage(img)
          .then(result => {
            console.log(result);
            resultEl.textContent = result.text;
          })
          .catch(err => {
            console.error(err);
            resultEl.textContent = err;
          });

        console.log(`Started decode for image from ${img.src}`)
      };

      for (const element of document.getElementsByClassName('decodeButton')) {
        element.addEventListener('click', decodeFun, false);
      }

    })
  </script>

</body>

</html>