close-popup-and-create-cookie-on-ninjaforms-submit.php

<?php

add_action( 'wp_footer', 'my_custom_popup_scripts', 500 );

function my_custom_popup_scripts() { ?>
<script type="text/javascript">
      (function ($, document, undefined) {
        
          jQuery('.popmake .ninja-forms-form').on('submitResponse', function(e, response) {
                var $popup = jQuery(this).parents('.pum'),
                  errors = response.errors;

                if (errors === false) {
                    $popup.trigger('pumSetCookie');

                  setTimeout(function () {
                      $popup.popmake('close');
                  }, 5000); // 5 seconds
                }
          });
        
      }(jQuery, document))
</script><?php
}