3D FlipBook - TypeError: _this.wnd is null

Hi, could you write a link to any page where you getting such error?

Hi, the link is https://ndoki.org/en-us/Resources/Documents

Try to create the book from document ready function:

jQuery(function() {
  jQuery('body').FlipBook(...);
});

Done, it still shows the same error.

Problem goes from this script: https://ndoki.org/Portals/_default/skins/wcs_ndoki/js/main.min.js?v=00.00.12 , if you exclude it from the page, it will work.

Tricks like $("#Form").appendTo("#mainform"); does not work for iframes.

In your case you need to create book only after that trick in main.min.js, something like:

 $( document ).ready(function() {
     setTimeout(function() {
         $('.sample-container').FlipBook({
             pdf: "FoxitPdfSdk.pdf",
             template: {
                 html: 'templates/default-book-view.html',
                 links: [{
                     rel: 'stylesheet',
                     href: 'css/font-awesome.min.css'
                 }],
                 styles: [
                     'css/short-black-book-view.css'
                 ],
                 script: 'js/default-book-view.js'
             },
         });
     }, 1000);
 });

You need to create your own document ready event that fires after the trick and use it for creating iframes containing objects.

Solved. Thank You for the Help!