Possible to validate data entries during Digital Signature?

I have a form that was built from scratch using Adobe LiveCycle Designer ES 8.2. I also have Adobe Acrobat Pro 9.3.2. (WinXP)
I see numerous articles online related to validating user input prior to data submission for an online form via a Submit button, however, I am trying to figure out how to implement the same sort of data validation during the signing of a particular digital signature field in an offline pdf form. Simply, I want to perform data validation during a digital signature instead of when user presses Submit button.
Here's my use-case:
1. Form Originator fills out a large number of data fields and signs form via a CAC cert.
2. Another person will review, possibly edit/add data, and sign another signature block with CAC.
3. Then there is one more final CAC signature on the form before it is completed and then emailed to the right folks for processing.
4. I would like to be able to enforce the population of several Mandatory data fields (at least one Radio button and one text input, possibly others) before the 3rd signature can be applied to the document.
Again, I need to emphasize this is all happening in an offline form, no data submission or database back-end. Also, everything with the digital signatures (and locking up fields afterword) works totally fine, just interested in adding Data Validation capability during Digital Signature.
I am in no way a javascript expert, but I can probably learn from a good example. Any help or guidance is very much appreciated. Thanks...

If you are using SignatureField in the form then you will get two events preSign and postSign which you can use to validate the field input just like you do with a Submit button.
Thanks
Srini

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Possible to validate data entries during Digital Signature?

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