Question

我只想尝试对pdf.js进行简单测试，以测试它的基本功能并使用以下代码在Firefox中显示正常但不在任何Chrome浏览器或Chrome扩展程序中真的需要它（Chrome扩展）。我只是在本地抓取一个pdf以显示PDF.js.有什么建议吗？

<html>
<body>
  <div>
    <button id="prev" onclick="goPrevious()">Previous</button>
    <button id="next" onclick="goNext()">Next</button>
    &nbsp; &nbsp;
    <span>Page: <span id="page_num"></span> / <span id="page_count"></span></span>
  </div>

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

  <!-- Use latest PDF.js build from Github -->
  <script type="text/javascript" src="http://mozilla.github.io/pdf.js/build/pdf.js"></script>

  <script type="text/javascript">
    //
    // NOTE: 
    // Modifying the URL below to another server will likely *NOT* work. Because of browser
    // security restrictions, we have to use a file server with special headers
    // (CORS) - most servers don't support cross-origin browser requests.
    //
    var url = '/home/brent/Documents/pdfviewer/custodian-parent.pdf';

    //
    // Disable workers to avoid yet another cross-origin issue (workers need the URL of
    // the script to be loaded, and currently do not allow cross-origin scripts)
    //
    PDFJS.disableWorker = true;

    var pdfDoc = null,
        pageNum = 1,
        scale = 1.0,
        canvas = document.getElementById('the-canvas'),
        ctx = canvas.getContext('2d');

    //
    // Get page info from document, resize canvas accordingly, and render page
    //
    function renderPage(num) {
      // Using promise to fetch the page
      pdfDoc.getPage(num).then(function(page) {
        var viewport = page.getViewport(scale);
        canvas.height = viewport.height;
        canvas.width = viewport.width;

        // Render PDF page into canvas context
        var renderContext = {
          canvasContext: ctx,
          viewport: viewport
        };
        page.render(renderContext);
      });

      // Update page counters
      document.getElementById('page_num').textContent = pageNum;
      document.getElementById('page_count').textContent = pdfDoc.numPages;
    }

    //
    // Go to previous page
    //
    function goPrevious() {
      if (pageNum <= 1)
        return;
      pageNum--;
      renderPage(pageNum);
    }

    //
    // Go to next page
    //
    function goNext() {
      if (pageNum >= pdfDoc.numPages)
        return;
      pageNum++;
      renderPage(pageNum);
    }

    //
    // Asynchronously download PDF as an ArrayBuffer
    //
    PDFJS.getDocument(url).then(function getPdfHelloWorld(_pdfDoc) {
      pdfDoc = _pdfDoc;
      renderPage(pageNum);
    });
  </script>  
</body>
</html>

这个代码是从他们的一个例子中的PDF.js github中获取的： [http://jsbin.com/pdfjs-prevnext-v2/6748/edit][1]

即使在他们的示例中，它也无法在Chrome中运行。

Answer 1

Chrome的XHR无法处理文件资源。在为使用XMLHttpRequest的Chrome开发Web应用程序时，请使用本地Web服务器。由于CORS，PDF.js和文件必须位于同一个Web服务器上。

扩展程序对'file：//'方案的访问权限由用户控制的“允许访问文件网址”复选框确定。

PDF.js在Firefox中打开pdf但不打开Chrome / Chromium或Extension

1 个答案: