Javascript prevents closing of PDF if some fields not filled in

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I have a form fill-able pdf, on document close if a certain field is not populated I pop up a message telling them to reopen and fill in that field.
Anyway I can abort the close in javascript it if it is not filled in?
Thank you for your time.

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Try putting several periods in the space. The form will recognize as being filled in. The periods are inobtrusive, and it is easy to change the entry later if needed.

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Maybe I didn’t explain it correctly.
How can I prevent a form form being saved if they have NOT entered a required field?

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