How to display whole PDF (not only one page) with PDF.JS?

Question 1

PDFJS has a member variable numPages, so you'd just iterate through them. BUT it's important to remember that getting a page in pdf.js is asynchronous, so the order wouldn't be guaranteed. So you'd need to chain them. You could do something along these lines:

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 );
    }
}

Question 2

Here's my take. Renders all pages in correct order and still works asynchronously.

<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: scale });
          canvas.height = viewport.height;
          canvas.width = viewport.width;          
          page.render({canvasContext: canvas.getContext('2d'), viewport: viewport});
    });
    }
</script>

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

Question 3

The accepted answer is not working anymore (in 2021), due to the API change for var viewport = page.getViewport( 1 ); to var viewport = page.getViewport({scale: scale});, you can try the full working html as below, just copy the content below to a html file, and open it:

<html>
<head>
<script src="https://mozilla.github.io/pdf.js/build/pdf.js"></script>
<head>
<body>
</body>

<script>

var url = 'https://raw.githubusercontent.com/mozilla/pdf.js/ba2edeae/web/compressed.tracemonkey-pldi-09.pdf';

// 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 = 'https://mozilla.github.io/pdf.js/build/pdf.worker.js';

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

//This is where you start
pdfjsLib.getDocument(url).promise.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( {scale: 1.5} );

    //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 );

    var line = document.createElement("hr");
    document.body.appendChild( line );

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

</html>

Question 4

The following answer is a partial answer targeting anyone trying to get a PDF.js to display a whole PDF in 2019, as the api has changed significantly. This was of course the OP's primary concern. inspiration sample code

Please take note of the following:

extra libs are being used -- Lodash (for range() function) and polyfills (for promises)....
Bootstrap is being used

    <div class="row">
        <div class="col-md-10 col-md-offset-1">
            <div id="wrapper">

            </div>
        </div>
    </div>

    <style>
        body {
            background-color: #808080;
            /* margin: 0; padding: 0; */
        }
    </style>    
    <link href="//cdnjs.cloudflare.com/ajax/libs/pdf.js/2.1.266/pdf_viewer.css" rel="stylesheet"/>    

    <script src="//cdnjs.cloudflare.com/ajax/libs/pdf.js/2.1.266/pdf.js"></script>    
    <script src="//cdnjs.cloudflare.com/ajax/libs/pdf.js/2.1.266/pdf_viewer.js"></script>
    <script src="//cdn.polyfill.io/v2/polyfill.min.js"></script>    
    <script src="//cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.js"></script>
    <script>
        $(document).ready(function () {
            // startup
        });

        'use strict';

        if (!pdfjsLib.getDocument || !pdfjsViewer.PDFViewer) {
            alert("Please build the pdfjs-dist library using\n" +
                "  `gulp dist-install`");
        }

        var url = '//www.pdf995.com/samples/pdf.pdf';

        pdfjsLib.GlobalWorkerOptions.workerSrc =
            '//cdnjs.cloudflare.com/ajax/libs/pdf.js/2.1.266/pdf.worker.js';

        var loadingTask = pdfjsLib.getDocument(url);
        loadingTask.promise.then(function(pdf) {
            // please be aware this uses .range() function from lodash
            var pagePromises = _.range(1, pdf.numPages).map(function(number) {
                return pdf.getPage(number);
            });
            return Promise.all(pagePromises);
        }).then(function(pages) {
                var scale = 1.5;
                var canvases = pages.forEach(function(page) {
                    var viewport = page.getViewport({ scale: scale, }); // Prepare canvas using PDF page dimensions

                    var canvas = document.createElement('canvas');
                    canvas.height = viewport.height;
                    canvas.width = viewport.width; // Render PDF page into canvas context

                    var canvasContext = canvas.getContext('2d');
                    var renderContext = {
                        canvasContext: canvasContext,
                        viewport: viewport
                    };
                    page.render(renderContext).promise.then(function() {
                        if (false)
                            return console.log('Page rendered');
                    });
                    document.getElementById('wrapper').appendChild(canvas);
                });
            },
            function(error) {
                return console.log('Error', error);
            });
    </script>

Question 5

First of all please be aware that doing this is really not a good idea; as explained in https://github.com/mozilla/pdf.js/wiki/Frequently-Asked-Questions#allthepages

How to do it;

Use the viewer provided by mozilla; https://mozilla.github.io/pdf.js/web/viewer.html

modify BaseViewer class, _getVisiblePages() method in viewer.js to

/* load all pages */ 
_getVisiblePages() {
      let visible = [];
      let currentPage = this._pages[this._currentPageNumber - 1];
      for (let i=0; i<this.pagesCount; i++){
        let aPage = this._pages[i];
        visible.push({ id: aPage.id, view: aPage, });
      }
      return { first: currentPage, last: currentPage, views: visible, };
    }

Question 6

The pdfjs-dist library contains parts for building PDF viewer. You can use PDFPageView to render all pages. Based on 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>

Question 7

If you want to render all pages of pdf document in different canvases, all one by one synchronously this is kind of solution:

index.html

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>PDF Sample</title>
    <script type="text/javascript" src="jquery.js"></script>
    <script type="text/javascript" src="pdf.js"></script>
    <script type="text/javascript" src="main.js">
    </script>
    <link rel="stylesheet" type="text/css" href="main.css">
</head>
<body id="body">  
</body>
</html>

main.css

canvas {
    display: block;
}

main.js

$(function() {  
    var filePath = "document.pdf";

    function Num(num) {
        var num = num;

        return function () {
            return num;
        }
    };

    function renderPDF(url, canvasContainer, options) {
        var options = options || {
                scale: 1.5
            },          
            func,
            pdfDoc,
            def = $.Deferred(),
            promise = $.Deferred().resolve().promise(),         
            width, 
            height,
            makeRunner = function(func, args) {
                return function() {
                    return func.call(null, args);
                };
            };

        function renderPage(num) {          
            var def = $.Deferred(),
                currPageNum = new Num(num);
            pdfDoc.getPage(currPageNum()).then(function(page) {
                var viewport = page.getViewport(options.scale);
                var canvas = document.createElement('canvas');
                var ctx = canvas.getContext('2d');
                var renderContext = {
                    canvasContext: ctx,
                    viewport: viewport
                };

                if(currPageNum() === 1) {                   
                    height = viewport.height;
                    width = viewport.width;
                }

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

                canvasContainer.appendChild(canvas);

                page.render(renderContext).then(function() {                                        
                    def.resolve();
                });
            })

            return def.promise();
        }

        function renderPages(data) {
            pdfDoc = data;

            var pagesCount = pdfDoc.numPages;
            for (var i = 1; i <= pagesCount; i++) { 
                func = renderPage;
                promise = promise.then(makeRunner(func, i));
            }
        }

        PDFJS.disableWorker = true;
        PDFJS.getDocument(url).then(renderPages);       
    };

    var body = document.getElementById("body");
    renderPDF(filePath, body);
});

Question 8

If you want to render all pages of pdf document in different canvases

<html>
   <head>
      <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
      <script src="pdf.js"></script>
      <script src="jquery.js"></script>
   </head>
   <body>
      <h1>PDF.js 'Hello, world!' example</h1>
      <div id="canvas_div"></div>
      <body>
         <script>
            // If absolute URL from the remote server is provided, configure the CORS
            // header on that server.
            var url = 'pdff.pdf';          
            // 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 = 'worker.js';
            var loadingTask = pdfjsLib.getDocument(url);
                loadingTask.promise.then(function(pdf) {
					 var __TOTAL_PAGES = pdf.numPages; 
					  // Fetch the first page
					  var pageNumber = 1;			  
					for( let i=1; i<=__TOTAL_PAGES; i+=1){
						var id ='the-canvas'+i;
						$('#canvas_div').append("<div style='background-color:gray;text-align: center;padding:20px;' ><canvas calss='the-canvas' id='"+id+"'></canvas></div>");				
						  var canvas = document.getElementById(id);
						  //var pageNumber = 1;
						  renderPage(canvas, pdf, pageNumber++, function pageRenderingComplete() {
							if (pageNumber > pdf.numPages) {
							  return; 
							}
							// Continue rendering of the next page
							renderPage(canvas, pdf, pageNumber++, pageRenderingComplete);
						  });				
					}            	  
                });           
                function renderPage(canvas, pdf, pageNumber, callback) {
                  pdf.getPage(pageNumber).then(function(page) {
                    var scale = 1.5;
                    var viewport = page.getViewport({scale: scale});            
                    var pageDisplayWidth = viewport.width;
                    var pageDisplayHeight = viewport.height;
            		//var pageDivHolder = document.createElement();
                    // Prepare canvas using PDF page dimensions
                    //var canvas = document.createElement(id);
                    var context = canvas.getContext('2d');
                    canvas.width = pageDisplayWidth;
                    canvas.height = pageDisplayHeight;
                   // pageDivHolder.appendChild(canvas);           
                    // Render PDF page into canvas context
                    var renderContext = {
                      canvasContext: context,
                      viewport: viewport
                    };
                    page.render(renderContext).promise.then(callback);
                  });
                }           
         </script>
         <html>

Question 9

The accepted answer works perfectly for a single PDF. In my case there were multiple PDFs that I wanted to render all pages for in the same sequence of the array.

I adjusted the code so that the global variables are encapsulated in an object array as follows:

    var docs = []; // Add this object array
    var urls = []; // You would need an array of the URLs to start.

    // Loop through each url. You will also need the index for later.
    urls.forEach((url, ix) => {

        //Get the document from the url.
        PDFJS.getDocument(url).then(function(pdf) {

            // Make new doc object and set the properties of the new document
            var doc = {};

            //Set PDFJS global object (so we can easily access in our page functions
            doc.thePDF = pdf;
    
            //How many pages it has
            doc.numPages = pdf.numPages;
    
            //Push the new document to the global object array
            docs.push(doc);            

            //Start with first page -- pass through the index for the handlePages method
            pdf.getPage( 1 ).then(page => handlePages(page, ix) );
    });
});
    
    
    
    function handlePages(page, ix)
    {
        //This gives us the page's dimensions at full scale
        var viewport = page.getViewport( {scale: 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.viewBox[3];
        canvas.width = viewport.viewBox[2];
    
        //Draw it on the canvas
        page.render({canvasContext: context, viewport: viewport});
    
        //Add it to an element based on the index so each document is added to its own element
        document.getElementById('doc-' + ix).appendChild( canvas );
    
        //Move to next page using the correct doc object from the docs object array
        docs[ix].currPage++;
        if ( docs[ix].thePDF !== null && docs[ix].currPage <= docs[ix].numPages )
        {
            console.log("Rendering page " + docs[ix].currPage + " of document #" + ix);
            docs[ix].thePDF.getPage( docs[ix].currPage ).then(newPage => handlePages(newPage, ix) );
        }
    }

Because the entire operation is asynchronous, without a unique object for each document, global variables of thePDF, currPage and numPages will be overwritten when subsequent PDFs are rendered, resulting in random pages being skipped, documents entirely skipped or pages from one document being appended to the wrong document.

One last point is that if this is being done offline or without using ES6 modules, the PDFJS.getDocument(url).then() method should change to pdfjsLib.getDocument(url).promise.then().

Question 10

Make it to be iterate every page how much you want.

const url = '/storage/documents/reports/AR-2020-CCBI IND.pdf';

pdfjsLib.GlobalWorkerOptions.workerSrc = '/vendor/pdfjs-dist-2.12.313/package/build/pdf.worker.js';

const loadingTask = pdfjsLib.getDocument({
    url: url,
    verbosity: 0
});

(async () => {
    const pdf = await loadingTask.promise;
    let numPages = await pdf.numPages;

    if (numPages > 10) {
        numPages = 10;
    }

    for (let i = 1; i <= numPages; i++) {
        let page = await pdf.getPage(i);
        let scale = 1.5;
        let viewport = page.getViewport({ scale });
        let outputScale = window.devicePixelRatio || 1;

        let canvas = document.createElement('canvas');
        let 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";

        document.getElementById('canvas-column').appendChild(canvas);

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

        let renderContext = {
            canvasContext: context,
            transform,
            viewport
        };

        page.render(renderContext);
    }
})();