JS code in PDF document not working at all

[ousia]

Attach (recommended) or Link to PDF file here:
PDF document with some JS inside

Configuration:

• Web browser and its version: Firefox 91.
• Operating system and its version: Windows 7.
• PDF.js version: the latest shipped with Firefox.
• Is a browser extension: Yes.

Steps to reproduce the problem:

1. Open the attached document.

2. Contained JS code in the PDF document:

   this.pageNum = this.numPages ;
   
   function GoToFirstSlide(label) {
     this.pageNum = 0 ;
   }
   
   function GoToLastSlide(label) {
     this.pageNum = this.numPages ;
   }
   
   function GoToNextSlide(label) {
     ++this.pageNum ;
   }
   
   function GoToPreviousSlide(label) {
     --this.pageNum ;
   }
   
   function SwitchFS() {
     if (app.fs.isFullScreen == true)
       app.fs.isFullScreen = false ;
     else
       app.fs.isFullScreen = true ;
   }

3. Neither buttons nor even the first line works.

What is the expected behavior? (add screenshot)

PDF.js should open page 25 (the last one) instead of page 1 (the first one).

What went wrong? (add screenshot)

JavaScript seems not to be implemented at all.

Many thanks for your help.

[calixteman]

JavaScript is implemented for fields (see https://www.adobe.com/content/dam/acom/en/devnet/pdf/pdfs/PDF32000_2008.pdf#page=440&zoom=auto,-215,499) but not for annotations.
It shouldn't be that hard to do but it's likely some work.

[ousia]

Many thanks for your reply, @calixteman.

I thought that this.pageNum = this.numPages ; wasn’t related to annotations.

But I must admit I don’t know how JS works in PDF documents.