addEventListener method - EventTarget class - dart:html library (original) (raw)

description

void addEventListener(

1. String type,
2. EventListener? listener, [
3. bool? useCapture ])

Implementation

void addEventListener(
  String type,
  EventListener? listener, [
  bool? useCapture,
]) {
  // TODO(leafp): This check is avoid a bug in our dispatch code when
  // listener is null.  The browser treats this call as a no-op in this
  // case, so it's fine to short-circuit it, but we should not have to.
  if (listener != null) {
    _addEventListener(type, listener, useCapture);
  }
}