In Angular 2, is it possible to fadeIn / fadeout instead of [hidden='xxx]?

Question

In Angular 2, is it possible to fadeIn / fadeout instead of [hidden=\'xxx]?

I have snippet of

and wa

Answer 1

 this.userName.valueChanges.debounceTime(100).subscribe(
        (value:string) => {
            console.log('name changed, notified via observable: ', value);
        }
    );