Canvas deleted from page division when scroll

[dixit-atharva]

When PDF has more then 10 pages and when i scroll down to page number 11 it blacks the first page canvas due to it lost the dropped item on canvas.

[VadimDez]

I'm not sure I can reproduce your issue. Are you able to reproduce it here - https://vadimdez.github.io/ng2-pdf-viewer/ ?

[dixit-atharva]

@VadimDez Please find uploaded image, try to upload PDF have more then 10 pages and scroll down slowly you will able to see first page canvas element is delete from it.

[VadimDez]

if you scroll back to the first page, can you see it?

[dixit-atharva]

Yes when i get back to page 1 i can see it again, but issue is right away like i have placed division over pdf canvas that also delete from it.

[ftaffelt]

Yes, this is the expected behaviour from PDFJS and so also from ng2-pdf-viewer. PDFJS renders only the visible pages, which are in the viewport plus some pages before and after this pages in the viewport. Pages which are not more in the visible range are "offloaded", meaning their canvas are removed from the DOM, to reduce memory footprint. If this page becomes visible again, the canvas will be readded to the DOM. Maybe your expaction from the option "Show all pages" is leading in the wrong way?

[dixit-atharva]

Yeah i think so, is there any way i can stop the offload or it or can set the visible pages range ?

[ftaffelt]

Not that i know, as this is deeply baked into PDFJS.

[shamoon]

Should be closed as above

also #1120