onSnapshot method

void onSnapshot(
  1. JSFunction onNext, [
  2. JSFunction onError
])

Attaches a listener for DocumentSnapshot events.

@param onNext A callback to be called every time a new DocumentSnapshot is available. @param onError A callback to be called if the listen fails or is cancelled. No further callbacks will occur. @return An unsubscribe function that can be called to cancel the snapshot listener.

Implementation

external void onSnapshot(
  JSFunction onNext, [
  JSFunction onError,
]);