When the zoom level is changed in a way that would invoke a change in optional 
content, your JavaScript (that is registered to that OCG) will be invoked.

So it's not on EVERY call to zoom in/out - just when an OCGs visibility state 
is changed.

If you need EVERY change, you'd need a custom plugin to Acrobat/Reader.

-----Original Message-----
From: dhryvastov [mailto:[email protected]] 
Sent: Tuesday, September 14, 2010 9:29 AM
To: [email protected]
Subject: Re: [iText-questions] Is it possible to fire event after zooming 
in/out?


Hi Leonard -

Many thanks for your reply. Your post has been very helpful for me. I have
learned about new helpful iText features which I didn't use before. After
revising examples from the book I have got understanding of PDF Layers,
JavaScript in PDF, zoom level for OCG. But one question is still opened for
me: how can I trigger my JavaScript on zoom in/out button clicked? I saw
events for opening document, printing it, closing etc. But didn't find for
changing zoom level...
Do you have any knowledge about this?

Appreciate your help,
- Denys
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