angular2-forms - 验证嵌套表单组

Question

我使用响应式(Reactive)表单在 Angular 2 中创建了一个表单组。我对此很陌生，所以如果这个问题没有意义，我提前道歉。我在父组中创建了一个嵌套组，它有自己的自定义验证器。在下面的代码片段中，嵌套组是 customRolesGroup。验证器适用于嵌套表单组，但父表单有一个控件也调用相同的验证方法。我遇到的问题是，每当父控件调用验证方法时，我需要它自动将嵌套组错误设置为 null 或 false。

我是否可以将嵌套组控件从父控件传递给验证器(customRoleValidation)或将嵌套表单控件错误修补为空？

public createNewForm(event: string) : FormGroup {
      this.addUserForm = this.fb.group({
          firstName: ['',
              [   Validators.required,
                  Validators.maxLength(AddUserConstants.maxLengthName)
              ]],
          lastName: ['',
              [   Validators.required,
                  Validators.maxLength(AddUserConstants.maxLengthName)]
              ],
          email: ['',
              [   Validators.required,
                  Validators.maxLength(AddUserConstants.maxLengthEmail),
                  Validators.pattern(AddUserConstants.emailPattern),
              ]],
          roleSelection: [AddUserConstants.roleCustom,
              [   Validators.required,
                  this.customRoleValidation
              ]],
          admin: '',
          customRolesGroup: this.fb.group({
              salesPerson: '',
              inventoryManager: '',
              creativeReviewer: '',
              reporter: '',
              observer: '',
          }, {validator: this.customRoleValidation}),
      });

      this.addEditButtonText = AddUserConstants.addUserCreateButton;
      this.addEditDBCall = AddUserConstants.addEvent;
      this.modalTitle = AddUserConstants.addUserTitle;


      return this.addUserForm;

  }
}


public customRoleValidation(c: AbstractControl) : {[key: string]: boolean} | null {

    let rolesSelectedCounter : number = 0;
    let noCustomRolesSelected : boolean;

    Object.keys(c.value).map(function(key) {
        if (c.value[key] == "" || c.value[key] == false) {
            rolesSelectedCounter++;
        }
        rolesSelectedCounter == Object.keys(c.value).length ? noCustomRolesSelected = true :                                    noCustomRolesSelected = false;
    });

    if (typeof c.parent !== 'undefined') {
        if (noCustomRolesSelected && c.root.value.roleSelection == AddUserConstants.roleCustom) {
            return { 'noCustomRoleSelected': true };
        } else {
            return null;
        }
    }
}

Answer 1

您可以从父控件而不是嵌套表单组中调用 this.customRoleValidation。在那里您可以获得父控件和嵌套表单组控件。