Angular 自定义验证器

Question

我正在尝试在 Angular cli 4.5.5 中制作自定义验证器 我的表单的某些部分只需要在选中复选框时进行验证。 我似乎没有让它工作。这是我的验证器代码：

export function validateCheckbox(control:AbstractControl){
const val = control.value;
const check = control.root.get('checkbox');

if (check) {
    if (val === null || val === undefined || val === '') {
        return {
            validateDays: {
              valid: false
            }
          };
    }else{
        return null;
    }
}else{
    return null;
}
}

这是我的组件代码：

    @Component({
    selector: 'caredeal-registration',
  templateUrl: './registration.component.html',
  styleUrls: ['./registration.component.scss'],
  encapsulation: ViewEncapsulation.None
})

export class RegistrationComponent implements OnInit {
  registerForm: FormGroup;

  constructor(private formBuilder: FormBuilder) {
    this.registerForm = this.formBuilder.group({
      name:['',Validators.required,Validators.minLength(2)],
      firstName:['',Validators.required,Validators.minLength(2)],
      email:['', Validators.required,Validators.minLength(2)],
      telephone:['',Validators.required,Validators.minLength(9)],
      mobilePhone:['',Validators.minLength(10)],
      type:[''],
      checkbox:[false],
      companyName:['',Validators.minLength(2)],
      rizivNumber:[''],
      taxNumber:['',Validators.minLength(2)],
      streetName:['', Validators.required],
      houseNumber:['',validateCheckbox],
      bus:[''],
      zipCode:['',Validators.required,Validators.minLength(4)],
      place:['',Validators.required,Validators.minLength(2)],
    })
   }

  ngOnInit() {
  }

}

我的html代码：

<form [formGroup]="registerForm" (ngSubmit)="onFormSubmit()">
        <div class="container-fluid">
            <h3>Account informatie</h3>
            <div class="row">
                <div class="col-md-6">
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-user"></i></span>
                        <input type="text" class="form-control" formControlName="name" placeholder="Naam">
                    </div>
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-user"></i></span>
                        <input type="text" class="form-control" formControlName="firstName" placeholder="Voornaam">
                    </div>
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-envelope"></i></span>
                        <input type="email" class="form-control" formControlName="email" placeholder="Email">
                    </div>
                </div>
                <div class="col-md-6">
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-earphone"></i></span>
                        <input type="tel" class="form-control" formControlName="telephone" placeholder="Telefoon">
                    </div>
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-earphone"></i></span>
                        <input type="tel" class="form-control" formControlName="mobilePhone" placeholder="GSM">
                    </div>
                    <div class="input-group">
                        <label for="sel1">Type klant:</label>
                        <select class="form-control" formControlName="type">
                            <option>1</option>
                            <option>2</option>
                            <option>3</option>
                            <option>4</option>
                        </select>
                    </div>
                </div>
            </div>
        </div>
        <div class="container-fluid">
            <h3>Bedrijfsgegevens</h3>
            <div class="row">
                <div class="col-xs-12">
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-home"></i></span>
                        <input type="text" class="form-control" formControlName="companyName" placeholder="Bedrijfsnaam">
                    </div>
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-home"></i></span>
                        <input type="number" class="form-control"formControlName="rizivNumber" placeholder="RIZIV-nummer">
                    </div>
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-home"></i></span>
                        <input type="text" class="form-control" formControlName="taxNumber" placeholder="BTW-nummer">
                    </div>
                </div>
            </div>
        </div>
        <div class="container-fluid">
            <h3>Afleveradres</h3>
            <div class="row">
                <div class="col-xs-12">
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-road"></i></span>
                        <input type="text" class="form-control" formControlName="streetName" placeholder="Straatnaam">
                    </div>
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-sound-5-1"></i></span>
                        <input type="number" class="form-control" formControlName="houseNumber" placeholder="Huisnummer">
                    </div>
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-inbox"></i></span>
                        <input type="text" class="form-control" formControlName="bus" placeholder="Bus">
                    </div>
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-inbox"></i></span>
                        <input type="number" class="form-control" formControlName="zipCode" placeholder="Postcode">
                    </div>
                    <div class="input-group">
                        <span class="input-group-addon"><i class="glyphicon glyphicon-inbox"></i></span>
                        <input type="text" class="form-control" formControlName="place" placeholder="Plaats">
                    </div>
                    <div class="input-group">
                        <input type="checkbox" formControlName="checkbox"  name="">Facturatie adres is verschillend van afleveradres<br>
                    </div>
                    <div class="input-group">
                        <button type="submit" [disabled] = "!registerForm.valid" class="btn btn-primary">Submit</button>
                    </div>
                </div>
            </div>
        </div>

</form>

我的复选框位于我的 html 代码的末尾。 目前我收到此错误： 期望验证器返回 Promise 或 Observable。

Answer 1

我认为您的问题与您的自定义验证器无关。您将某些验证器作为异步验证器传递，而它们不是异步的。

请查看FormControl 构造函数文档。

尝试将email:['', Validators.required,Validators.minLength(2)], 等行替换为email:['', [Validators.required,Validators.minLength(2)]],