Customizing pdf.js

Question

i would like to use pdf.js in my webApplication and customize it's view, so i can embedd it into the rest of my application (i was thinking about using an iframe).

At first i would like to get rid of most of the default toolbar-buttons like "print" or "download file" but keep the zoom and page navigation. Instead, i want these features (print/download) to appear inside my application's toolbar. How to do that? How can i hide the print/download buttons from the pdf.js toolbar and call this features with my custom buttons which are rendered inside my webapplication already?

Or should i use another library other than pdf.js?

Any information are very helpful!!

Answer 1

you can also build your own pdf viewer.You need to add a canvas element in your document.See the sample code below.you can add simple buttons or screen swipes to navigate to next pages or reload with page with a different scale. Initially its set to fit the screen width. Also see examples from pdf.js github. Sample code:

    function initializePsfJS() {
    pdfDoc = null;
    pageNum = 1;
    pageRendering = false;
    pageNumPending = null;
    scale = 1;
    canvas = document.getElementById('the-canvas');
    ctx = canvas.getContext('2d');
    viewport = null;
    PDFJS.workerSrc = './js/pdf.worker.js';
}

/**
 * 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) {
        if (scale === "fit") {
            var unscaledViewport = page.getViewport(1);
            var viewerCont = document.getElementById('viewerDiv');
            var bdrec = viewerCont.getBoundingClientRect();
            scale = Math.min((bdrec.height / unscaledViewport.height), (bdrec.width / unscaledViewport.width));
        }
        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;
            }
            calculateinitialXY();
        });
    });
}

/**
 * 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);
    }
}

function getDocumentByXMLHttpRequest() {
    //reason for this
    //http://stackoverflow.com/questions/36199155/pdf-file-generated-by-post-request-not-opening
    var header = getHeader();
    var requesturl =  < url rest service url to fetch document >
        var xhr = new XMLHttpRequest();
    xhr.open('GET', requesturl);
    xhr.setRequestHeader(header.key, header.value);
    xhr.responseType = 'arraybuffer';
    xhr.onload = function () {
        if (this.status == 200) {
            onloadDocumentFromContent(this.response);
        } else {
            navigator.notification.alert('Error while requesting pdf with id ' + getDocumentId());

        }
    };
    xhr.send();
}
function onloadDocumentFromContent(pdfraw) {

    var docInitParams = {
        data : pdfraw
    };

    PDFJS.getDocument(docInitParams).then(function (pdfDoc_) {
        pdfDoc = pdfDoc_;

        // Initial/first page rendering

        renderPage(pageNum);
    });

}