How to continue form submission after an AJAX call?

Question

I want to validate user entries on a WordPress post upon hitting the submit button, display an error message is there are problems, and submit the form if everything is OK.

Answer 1

Wordpress has its own mechanism to process Ajax requests, using wp-admin/wp-ajax.php. This allows you to run arbitrary code on either side of the Ajax boundary without having to write the back and forth status-checking code and all that. Set up your callbacks and go....