角2 FormGroup添加校驗動態

Question

即時特林驗證添加到FormContol動態（不是初始化），它不是工作....

代碼：

this.formGroup.controls["firstName"].validator = Validators.Required;

有人做過嗎？

Answer 1

//Try this, not verified, but should work 

this.formGroup.controls["firstName"].setValidators(Validators.required); 

對於多個驗證

this.formGroup.controls["firstName"].setValidators([Validators.required, Validators.minLength(2)]); 

但這樣做將覆蓋在initialistaion