useEventEmitter

Sometimes it is difficult to pass events between multiple components. By using EventEmitter, this can be simplified.

To get an instance of EventEmitter, you can call useEventEmitter in React components.

const event$ = useEventEmitter();

If the component renders multiple times, the return value of useEventEmitter in every render process will stay unchanged and no extra EventEmitter instance will be created.

Then we can share event$ to other components via props or Context. To push a event, just call the emit method of EventEmitter. To subscribe to a series of events, call the useSubscription method.

event$.emit('hello');

event$.useSubscription(val => {
  console.log(val);
});

useSubscription will automatically register the subscription and unsubscription.

If you want to let the child component notify the parent component, you can just use props to pass a onEvent function. And if you want to let the parent component notify the child component, you can use forwardRef to retrieve the ref of child component. useEventEmitter is most suitable for event management among multiple components or between two components which are far away.

Examples

Parent component shares a event

API

Params

const result: Result = useEventEmitter<T>();

Result