[рони]

adash,

form.on("input change", ".required, .city-id, #parent_cat_id, #category_id", function(event) {
                var el = this;
                var ok = el.value.trim();
                el.classList.contains("city-id") && (el = el.parentNode);
                ok && ok != "0" && el.classList.remove("empty_field")
            })

function audit(current_tab) {
                var elems = $(".required, .city-id, #parent_cat_id, #category_id", current_tab);
                return [].every.call(elems, function(el, i) {
                    var ok = el.value.trim();
                    el.classList.contains("city-id") && (el = el.parentNode);
                    ok && +ok != 0 ? el.classList.remove("empty_field") :
                        el.classList.add("empty_field");
                    return ok && ok != "0"
                });
            }