更改表单以动态方式控制验证并立即以角反应形式应用新验证

Question

我有几种形式，我需要根据＃form1用户选择对＃form2输入进行自定义验证。我写了一个自定义验证（尚未完成）。

自定义验证程序：

@Injectable()
export class Checks {

    constructor(public prescConfigService: PrescConfigService) { }

    validity(section, key: string): ValidatorFn | null {
        const condition = this.prescConfigService.getDefaultSetting(section, key);
        if (!condition) {
            console.log('if there is no condition (not selected): ', condition);
            return (control: AbstractControl): { [key: string]: boolean } | null => {
                console.log('control1: ', control);
                return null;
            };
        } else {
            console.log('elseeeee', condition);
            return (control: AbstractControl): { [key: string]: boolean } | null => {
                console.log('control2: ', control);
                return { 'required': true };
            };
        }
    }
}

form2创建：

this.form = this.fb.group({
      NationalNum: [this.prescConfigService.getValueByField('CustomerNationalNum'), {
        validator: [this.checks.validity('insurance', 'CheckNationalNum')],
        updateOn: 'change'
      }],
      BirthDateJalali: [this.prescConfigService.getValueByField('BirthDate'), Validators.required],
      Cellphone: [this.prescConfigService.getValueByField('Cellphone'), Validators.required],
      Sex: [this.prescConfigService.getValueByField('SexID'), Validators.required],
    });

我需要做的是，当用户从＃form1（位于不同组件上）更改选择时，将应用自定义验证。反正有吗？