¿Cómo mostrar un PDF completo (no solo una página) con PDF.JS?

Solución:

PDFJS tiene una variable miembro numPages, por lo que simplemente iteraría a través de ellos. PERO Es importante recordar que obtener una página en pdf.js es asincrónico, por lo que el orden no estaría garantizado. Entonces necesitarías encadenarlos. Podrías hacer algo en este sentido:

var currPage = 1; //Pages are 1-based not 0-based
var numPages = 0;
var thePDF = null;

//This is where you start
PDFJS.getDocument(url).then(function(pdf) {

        //Set PDFJS global object (so we can easily access in our page functions
        thePDF = pdf;

        //How many pages it has
        numPages = pdf.numPages;

        //Start with first page
        pdf.getPage( 1 ).then( handlePages );
});



function handlePages(page)
{
    //This gives us the page's dimensions at full scale
    var viewport = page.getViewport( 1 );

    //We'll create a canvas for each page to draw it on
    var canvas = document.createElement( "canvas" );
    canvas.style.display = "block";
    var context = canvas.getContext('2d');
    canvas.height = viewport.height;
    canvas.width = viewport.width;

    //Draw it on the canvas
    page.render({canvasContext: context, viewport: viewport});

    //Add it to the web page
    document.body.appendChild( canvas );

    //Move to next page
    currPage++;
    if ( thePDF !== null && currPage <= numPages )
    {
        thePDF.getPage( currPage ).then( handlePages );
    }
}

Aquí está mi opinión. Representa todas las páginas en el orden correcto y sigue funcionando de forma asincrónica.

<style>
  #pdf-viewer {
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.1);
    overflow: auto;
  }

  .pdf-page-canvas {
    display: block;
    margin: 5px auto;
    border: 1px solid rgba(0, 0, 0, 0.2);
  }
</style>

<script>   
    url="https://github.com/mozilla/pdf.js/blob/master/test/pdfs/tracemonkey.pdf";
    var thePdf = null;
    var scale = 1;

    PDFJS.getDocument(url).promise.then(function(pdf) {
        thePdf = pdf;
        viewer = document.getElementById('pdf-viewer');

        for(page = 1; page <= pdf.numPages; page++) {
          canvas = document.createElement("canvas");    
          canvas.className="pdf-page-canvas";         
          viewer.appendChild(canvas);            
          renderPage(page, canvas);
        }
    });

    function renderPage(pageNumber, canvas) {
        thePdf.getPage(pageNumber).then(function(page) {
          viewport = page.getViewport(scale);
          canvas.height = viewport.height;
          canvas.width = viewport.width;          
          page.render({canvasContext: canvas.getContext('2d'), viewport: viewport});
    });
    }
</script>

<div id='pdf-viewer'></div>

La biblioteca pdfjs-dist contiene partes para construir un visor de PDF. Puede utilizar PDFPageView para representar todas las páginas. Basado en https://github.com/mozilla/pdf.js/blob/master/examples/components/pageviewer.html:

var url = "https://cdn.mozilla.net/pdfjs/tracemonkey.pdf";
var container = document.getElementById('container');
// Load document
PDFJS.getDocument(url).then(function (doc) {
  var promise = Promise.resolve();
  for (var i = 0; i < doc.numPages; i++) {
    // One-by-one load pages
    promise = promise.then(function (id) {
      return doc.getPage(id + 1).then(function (pdfPage) {
// Add div with page view.
var SCALE = 1.0; 
var pdfPageView = new PDFJS.PDFPageView({
      container: container,
      id: id,
      scale: SCALE,
      defaultViewport: pdfPage.getViewport(SCALE),
      // We can enable text/annotations layers, if needed
      textLayerFactory: new PDFJS.DefaultTextLayerFactory(),
      annotationLayerFactory: new PDFJS.DefaultAnnotationLayerFactory()
    });
    // Associates the actual page with the view, and drawing it
    pdfPageView.setPdfPage(pdfPage);
    return pdfPageView.draw();        
      });
    }.bind(null, i));
  }
  return promise;
});

#container > *:not(:first-child) {
  border-top: solid 1px black; 
}

<link href="https://npmcdn.com/pdfjs-dist/web/pdf_viewer.css" rel="stylesheet"/>
<script src="https://npmcdn.com/pdfjs-dist/web/compatibility.js"></script>
<script src="https://npmcdn.com/pdfjs-dist/build/pdf.js"></script>
<script src="https://npmcdn.com/pdfjs-dist/web/pdf_viewer.js"></script>

<div id="container" class="pdfViewer singlePageView"></div>

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