Separate field checking and form submission

Good afternoon, friends.

Is it possible to leave the field check function in your form without sending the form to the server?
In particular, I am interested in the possibility of calling the verification and sending functions separately.
If it is not difficult for you, please, I would be very grateful if you could provide me with the code to call a particular function by clicking on the conditional .

With great respect to your work, Alex

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