examples/learning/helloworld.html - master - githubmirror/pdf.js

examples/learning/helloworld.html

71 строка2 KB

Jonas Jenwald

[api-major] Remove support for calling `getDocument` without a parameter object

09 май 2026, 14:00

09 май 2026, 14:002e7a221

<!doctype html>
<html>
  <head>
    <meta charset="UTF-8" />
    <title>'Hello, world!' example</title>
  </head>
  <body>
    <h1>'Hello, world!' example</h1>

    <canvas id="the-canvas" style="border: 1px solid black; direction: ltr"></canvas>

    <script src="../../node_modules/pdfjs-dist/build/pdf.mjs" type="module"></script>

    <script id="script" type="module">
      //
      // If absolute URL from the remote server is provided, configure the CORS
      // header on that server.
      //
      const url = "./helloworld.pdf";

      //
      // The workerSrc property shall be specified.
      //
      pdfjsLib.GlobalWorkerOptions.workerSrc = "../../node_modules/pdfjs-dist/build/pdf.worker.mjs";

      //
      // Asynchronous download PDF
      //
      const loadingTask = pdfjsLib.getDocument({ url });
      const pdf = await loadingTask.promise;
      //
      // Fetch the first page
      //
      const page = await pdf.getPage(1);
      const scale = 1.5;
      const viewport = page.getViewport({ scale });
      // Support HiDPI-screens.
      const outputScale = window.devicePixelRatio || 1;

      //
      // Prepare canvas using PDF page dimensions
      //
      const canvas = document.getElementById("the-canvas");
      const context = canvas.getContext("2d");

      canvas.width = Math.floor(viewport.width * outputScale);
      canvas.height = Math.floor(viewport.height * outputScale);
      canvas.style.width = Math.floor(viewport.width) + "px";
      canvas.style.height = Math.floor(viewport.height) + "px";

      const transform = outputScale !== 1 ? [outputScale, 0, 0, outputScale, 0, 0] : null;

      //
      // Render PDF page into canvas context
      //
      const renderContext = {
        canvasContext: context,
        transform,
        viewport,
      };
      page.render(renderContext);
    </script>

    <hr />
    <h2>JavaScript code:</h2>
    <pre id="code"></pre>
    <script>
      document.getElementById("code").textContent = document.getElementById("script").text;
    </script>
  </body>
</html>