subscribe to valueChanges from input FormControl in FormGroup

Question

In Angular 4, I\'m trying to subscribe to the valueChanges of a FormControl. Neither of the versions below is working. I\'m not seeing any errors. The form.value JSON is upd

Answer 1

I gave up on FormGroup and FormBuilder and just used

HTML:

App class:

firstName = new FormControl();

ngOnInit:

this.firstName.valueChanges.subscribe(value => {
     console.log('name has changed:', value)
});

My test is currently broken with the error "No provider for NgControl" but I'll work on that next. Update: I just needed to import ReactiveFormsModule in the TestBed