After emitting an event, I am looking to run some additional code. Is there a method to chain the .next() function in this way?
@Output() myEvent = new EventEmitter<string>();
this.myEvent.next({‘test string’}).onComplete(console.log('done');
After emitting an event, I am looking to run some additional code. Is there a method to chain the .next() function in this way?
@Output() myEvent = new EventEmitter<string>();
this.myEvent.next({‘test string’}).onComplete(console.log('done');
EventEmitter serves as a higher level abstraction of RxJS's Subject (although this may change in the future), with Subject implementing both Observable and Observer. It's important to note that next is not considered an operator; in fact, it is part of the Observer interface, returning no value and cannot be chained.
In the example above, EventEmitter utilizes the emit method for emitting events, while next is part of the Subject API. Therefore, using emit is recommended:
@Output() myEvent = new EventEmitter<string>();
this.myEvent.emit({‘test string’});
There is no need for an onComplete method, as outputs are meant to remain incomplete until the component is destroyed.
If desired, you can achieve similar functionality with:
this.myEvent.subscribe(null, null, () => console.log('done'));
However, this approach would result in an additional subscription. Any logic related to destruction should be handled within the respective lifecycle hook:
ngOnDestroy() {
console.log('done');
}
Unfortunately, there is no method to track this externally from the component that triggers the event since it is meant to operate on a "fire and forget" basis.
One alternative is to set up another @Input value that is triggered by the parent component after completing the "post-event actions". By monitoring this input, you can accurately determine when to proceed with subsequent tasks.
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