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JavaScriptでQRコードからSVGファイルを作成する

Last updated at Posted at 2024-03-31
<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="https://cdn.jsdelivr.net/npm/jquery@3.7.1/dist/jquery.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/qrcode@1.4.4/build/qrcode.min.js"></script>
  </head>

  <body>
    <p style="font-size: 32px;">QRコードからSVGファイルを作成します</p>
    <input type="text" id="inputText" />
    <button onclick="generateQRCode()">QRコード生成</button>
    <div id="qrcode"></div>
    <a id="downloadLink" style="display: none;">SVGファイルをダウンロード</a>
    <script>
      async function generateQRCode() {
        const inputText = $("#inputText").val();
        const options = {
          type: 'svg',
          // width: 256,
          margin: 2,
          color: {
            dark: '#000',
            light: '#fff'
          }
        };
        const svgTag = await QRCode.toString(inputText, options);
        console.log(svgTag)
        $("#qrcode").empty().append(svgTag);
        $("#qrcode svg").attr("width", "256px");
        const fileName = "";
        const downloadLink = document.getElementById("downloadLink");
        downloadLink.href = "data:image/svg+xml;charset=utf-8," + encodeURIComponent(svgTag);
        downloadLink.download = fileName;
        downloadLink.style.display = "inline"; // displayをinlineに変更
      }
    </script>
  </body>
</html>

jsDelivr

Browser
node-qrcode can be used in browser through module bundlers like Browserify and Webpack or by including the precompiled bundle present in build/ folder.

ブラウザからCDNで利用する時は、buildフォルダのファイルを指定する

参考

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