1. polymer
  2. polymer
  3. Polymer
  4. onMutation

method onMutation

Future<List<MutationRecord>> onMutation(Node node)

Returns a future when node changes, or when its children or subtree changes.

Use MutationObserver if you want to listen to a stream of changes.

Source 

Future<List<MutationRecord>> onMutation(Node node) {
  var completer = new Completer();
  new MutationObserver((mutations, observer) {
    observer.disconnect();
    completer.complete(mutations);
  })..observe(node, childList: true, subtree: true);
  return completer.future;
}