I'm having an issue from pdfjs. Long story short: I added an append function inside (.spread>.page), used in viewer.js to load after page is loaded using eventBus.on("pagesloaded", function (){}

it will work successfully, but when I click on zoom in or out, or start scrolling the element I appended will disappear..

here's my code:

$(".spread .page").each(function() {
    $(this).append("<div class='canvasArea'><canvas></canvas></div>");
});

is there anyway to run this function when every time the pdfjs rendering triggers?