小编Car*_*lat的帖子

我正在尝试使用自定义验证来验证表单.出于某种原因,我必须构建一个可以更改电子邮件或设置新密码的表单.出于这个原因,我不能使用Validators.required,因为密码字段只有在被触摸时才需要.

我的问题是,当解决输入验证时,表单仍然无效.

我做了一个plnkr来证明我的问题:http://plnkr.co/edit/obF4gC5RHkXOOlCEsIuH？p = preview

ngOnInit(): void {
    this.emailField = new FormControl('mail@mail.com', Validators.email);
    this.pw1 = new FormControl('', [this.passwordAreEqualValidator, Validators.minLength(2)]);
    this.pw2 = new FormControl('', this.passwordAreEqualValidator);
    this.pwOld = new FormControl('', this.notEmptyIfNewIsTouchedValidator);

    this.form = this.formBuilder.group({
      pw1: this.pw1,
      pw2: this.pw2,
      emailField: this.emailField,
      pwOld: this.pwOld
    });
  }

notEmptyIfNewIsTouchedValidator(control: FormControl) : ValidationErrors | null {
    if (control.dirty) {
      if (control.value === '') {
        return {
          oldPasswordEmpty: true
        }
      }

      const parent = control.parent,
            pw1 = parent.get('pw1'),
            pw2 = parent.get('pw2');

      // this will trigger nothing …