How to render whole pdf document using pdf.js library?

Question

I tried rendering PDF document using pdf.js library. I know only basics in javascript and I am new to promises, so at first I followed advice on this page: Render .pdf to si

Answer 1

Thank you @user3913960, your concept worked for me. I found some issues in your code which I fixed. Here is the code:

function loadPDFJS(pageUrl) {
    PDFJS.workerSrc = 'resources/js/pdfjs/pdf.worker.js';
    var currentPage = 1;
    var pages = [];
    var globalPdf = null;
    var container = document.getElementById('pdf-container');
    function renderPage(page) {
        //
        // Prepare canvas using PDF page dimensions
        //
        var canvas = document.createElement('canvas');
        // Link: http://stackoverflow.com/a/13039183/1577396
        // Canvas width should be set to the window's width for appropriate
        // scaling factor of the document with respect to the canvas width
        var viewport = page.getViewport(window.screen.width / page.getViewport(1.0).width);
        // append the created canvas to the container
        container.appendChild(canvas);
        // Get context of the canvas
        var context = canvas.getContext('2d');
        canvas.height = viewport.height;
        canvas.width = viewport.width;
        //
        // Render PDF page into canvas context
        //
        var renderContext = {
            canvasContext: context,
            viewport: viewport
        };
        page.render(renderContext).then(function () {
            if (currentPage < globalPdf.numPages) {
                pages[currentPage] = canvas;
                currentPage++;
                globalPdf.getPage(currentPage).then(renderPage);
            } else {
                // Callback function here, which will trigger when all pages are loaded
            }
        });
    }
    PDFJS.getDocument(pageUrl).then(function (pdf) {
        if(!globalPdf){
            globalPdf = pdf;
        }
        pdf.getPage(currentPage).then(renderPage);
    });
}
loadPDFJS("somepdffilenamehere.pdf");