+
+ // https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/HTML5/Constraint_validation
+ // doesn't support hidden fields, so we check those in an extra step
+ function validate_field(field) {
+ if (field.type === 'hidden') {
+ if (field.value.length) {
+ if (field.pattern && !field.value.match(field.pattern)) return false;
+ }
+ }
+ return field.checkValidity(); // for hidden field always true
+ }
+
+ function handle_submit(event) {
+ let form = event.target;
+
+ let allow_submit = true;
+
+ Array.prototype.slice.call(form.elements).forEach(function (field) {
+ if (!validate_field(field)) {
+ alert('Invalid input in ' + field.name);
+ allow_submit = false;
+ }
+ });
+
+ if (allow_submit) refresh_page(page, serialize_form(form));
+ }