functions/AjaxRequest.js

/**
 * Add a hidden field to the form to indicate that this will be an
 * Ajax request (only if this hidden field does not exist)
 *
 * @param $form object   the form
 */
export function PMA_prepareForAjaxRequest ($form) {
    if (! $form.find('input:hidden').is('#ajax_request_hidden')) {
        $form.append('<input type="hidden" id="ajax_request_hidden" name="ajax_request" value="true" />');
    }
}