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javascript functions in PDF

Hi all.
I am creating a PDF document dynamically and need to add validations for different datatypes. Is there a concept of _javascript_ functions in PDF? Just like we have a set of functions in .js file  and we include it in HTML to do client side validations, do we have anything similar in PDF?  And if so, does ITEXT provides APIs to achieve it?
Any help is highly appreciated.
 
Regards,
Sanjeev


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