jsPDF generating two pdf files

Question

I'm using the code below to create a PDF of an image when the user clicks the "download" button. It's almost working fine but the problem is that it’s generating two PDF files instead of one.

(function($) {
    $(document).ready(function() {
        $('#downloadPDF').click(function() {
            var doc = new jsPDF("p", "mm", "a4");

            function getDataUri(url, callback) {
                var image = new Image();

                image.onload = function() {
                    var canvas = document.createElement('canvas');
                    canvas.width = this.naturalWidth; // or 'width' if you want a special/scaled size
                    canvas.height = this.naturalHeight; // or 'height' if you want a special/scaled size

                    canvas.getContext('2d').drawImage(this, 0, 0);

                    // Get raw image data
                    callback(canvas.toDataURL('image/png').replace(/^data:image\/(png|jpg);base64,/, ''));

                    // ... or get as Data URI
                    callback(canvas.toDataURL('image/png'));
                };

                image.src = url;
            }

            // Usage
            getDataUri('/cover.png', function(dataUri) {
                console.log('RESULT:', dataUri);
                doc.addImage(dataUri, 'png', 0, 0, 210, 297, undefined, 'FAST');
                doc.save('download.pdf')
            });
        })
    })
})(jQuery)

I think it’s a loop, but I can't figure out how to solve it.

Answer 1

You seem to be calling callback twice, once after the comment // Get raw image data and another time after // ... or get as Data URI. Remove one of the calls depending which case you want and it should solve the problem.