dart:html

Свойство selectedOptions

Источник

List<OptionElement> get selectedOptions {
  // IE does not change the selected flag for single-selection items.
  if (this.multiple) {
    var options = this.options.where((o) => o.selected).toList();
    return new UnmodifiableListView(options);
  } else {
    return [this.options[this.selectedIndex]];
  }
}