PDFJS Express Zoom API

Bug Reports
1

Zoom API not working…

Please for code snippet using the zoom API from PDFJS express!

grafik
grafik790×242 6.75 KB

Using the code below, the zoom API of DocumentViewer does not response…

var instance = getInstance(document.getElementById(1));
var docViewer = instance.Core.documentViewer;
var zoomLevel = instance.Core.documentViewer.getZoom();
docViewer.setCurrentPage(1);
docViewer.setPageZoom(1, (zoomLevel * 2));
//docViewer.updateVisiblePages( ); // ???

Thanks for help.
C.Sonnweber

3

Hey there!

I just tried your code and it worked exactly as expected.

Make sure you are calling the code in the documentLoaded event like so:

instance.Core.documentViewer.addEventListener('documentLoaded', () => {
    const docViewer = instance.Core.documentViewer;
    const zoomLevel = instance.Core.documentViewer.getZoom();
    docViewer.setCurrentPage(1);
    docViewer.setPageZoom(1, (zoomLevel * 2));
  })

Thanks!
Logan

4

Hi Logan, thanks for reply.
We don’t not use the internal header-items of pdfjs express. We are invoking only few pdfjs-function by external buttons. See screenshot attached. It explains the scenario…The header items I have disabled.
Your code just explains setting the zoom a inside the documentLoaded event…
We click the zoom buttons until desired magnification of picture…

grafik
grafik1677×765 91.6 KB

Thanks,
Christian