addDataListener method

void addDataListener(
  1. void onValue(
    1. Map<String, dynamic> data
    )?
)

Implementation

void addDataListener(void Function(Map<String, dynamic> data)? onValue) {
  ref?.onValue.listen((event) {
    data =
        (event.snapshot.value ?? <String, dynamic>{}) as Map<String, dynamic>;
    if (onValue != null) {
      onValue(data);
    }
  });
}