typescript CV-3.ts

Posted 2021-05-20

  ngOnInit() {
    this.form = new FormGroup({
      optionA: new FormControl(false),
      optionB: new FormControl(false),
      optionBExtra: new FormControl('')
    });

    this.optionB.valueChanges.subscribe(checked => {
      if (checked) {
        this.optionBExtra.setValidators([Validators.required, Validators.minLength(5)]);
      } else {
        this.optionBExtra.setValidators(null);
      }
      this.optionBExtra.updateValueAndValidity();
    });
  }