var url = location.search.substring(1);

PDFJS.cMapUrl = 'https://unpkg.com/pdfjs-dist@1.9.426/cmaps/';
PDFJS.cMapPacked = true;

var pdfDoc = null;

function createPage() {
  var div = document.createElement("canvas");
  document.body.appendChild(div);
  return div;
}

function renderPage(num) {
  pdfDoc.getPage(num).then(function (page) {
    var viewport = page.getViewport(2.0);
    var canvas = createPage();
    var ctx = canvas.getContext('2d');

    canvas.height = viewport.height;
    canvas.width = viewport.width;

    page.render({
      canvasContext: ctx,
      viewport: viewport
    });
  });
}

PDFJS.getDocument(url).then(function (pdf) {
  pdfDoc = pdf;
  for (var i = 1; i <= pdfDoc.numPages; i++) {
    renderPage(i)
  }
});