text: // If absolute URL from the remote server is provided, configure the CORS
  // header on that server.
  var name = document.getElementById('PDFDir').innerHTML;
  var url = '/pdf/' + encodeURIComponent(name);
  
  
  // Loaded via <script> tag, create shortcut to access PDF.js exports.
  var pdfjsLib = window['pdfjs-dist/build/pdf'];
  
  // The workerSrc property shall be specified.
  pdfjsLib.GlobalWorkerOptions.workerSrc = '//mozilla.github.io/pdf.js/build/pdf.worker.js';
  
  var pdfDoc = null,
      pageNum = 1,
      pageRendering = false,
      pageNumPending = null,
      scale = 0.8,
      canvas = document.getElementById('the-canvas'),
      ctx = canvas.getContext('2d');
  
  /**
   * Get page info from document, resize canvas accordingly, and render page.
   * @param num Page number.
   */
  function renderPage(num) {
    pageRendering = true;
    // Using promise to fetch the page
    pdfDoc.getPage(num).then(function(page) {
     var desiredWidth = document.getElementById('pdfContainer').offsetWidth*0.95;
      var viewport = page.getViewport(1);
      var scale = desiredWidth / viewport.width;
      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
      };
      var renderTask = page.render(renderContext);
  
      // Wait for rendering to finish
      renderTask.promise.then(function() {
        pageRendering = false;
        if (pageNumPending !== null) {
          // New page rendering is pending
          renderPage(pageNumPending);
          pageNumPending = null;
        }
      });
    });
  
    // Update page counters
    document.getElementById('page_num').textContent = num;
  }
  
  /**
   * If another page rendering in progress, waits until the rendering is
   * finised. Otherwise, executes rendering immediately.
   */
  function queueRenderPage(num) {
    if (pageRendering) {
      pageNumPending = num;
    } else {
      renderPage(num);
    }
  }
  
  /**
   * Displays previous page.
   */
  function onPrevPage() {
    if (pageNum <= 1) {
      return;
    }
    pageNum--;
    queueRenderPage(pageNum);
  }
  document.getElementById('prev').addEventListener('click', onPrevPage);
  
  /**
   * Displays next page.
   */
  function onNextPage() {
    if (pageNum >= pdfDoc.numPages) {
      return;
    }
    pageNum++;
    queueRenderPage(pageNum);
  }
  document.getElementById('next').addEventListener('click', onNextPage);
  
  /**
   * Asynchronously downloads PDF.
   */
  pdfjsLib.getDocument(url).then(function(pdfDoc_) {
    pdfDoc = pdfDoc_;
    document.getElementById('page_count').textContent = pdfDoc.numPages;
  
    // Initial/first page rendering
    renderPage(pageNum);
  });
  
  function gotoDocument(){
    window.location = '/pdf/' + encodeURIComponent(name);
  }