Question

我的FormGroup有一些FormControles并且所有这些都是必需的，但是如果我的component.ts中的布尔值为true，我只需要两个FormControles我试过ng-required="myboolean"但是这个没工作。有没有办法做到这一点或解决方法？

//修改

onButtonClick()
  {
    this.passwordFormControl = !this.passwordFormControl;

    if(this.passwordFormControl)
    {
      this.passwortButton = "Cancle change Password";
      this.benutzerAnlageForm.get('password').setValidators(Validators.required);
    }
    else
    {
      this.passwortButton = "Change password";
      this.benutzerAnlageForm.get('password').clearValidators();
    }
  }

 <form [formGroup]="MyForm" (ngSubmit)="onMyForm()">

  <div *ngIf="passwordFormControl" class = "form-group">
      <label for="password">Password</label>
      <input formControlName="password" type="password" id="password" 

 <-- Some more Form Controles that are always required -->

  <button type="submit" [disabled]="!MyForm.valid" class ="btn btn-primary">Save</button>
  <button *ngIf="edit" type="button" class="btn btn-primary" (click)="onButtonClick()">{{passwortButton}}</button>
  </form>

密码FormControl是控件我不总是希望被要求。问题是，如果我从密码FormControl中删除了表单本身，而Button似乎无法识别该表单现在再次有效。

Answer 1

ng-required适用于1.x的AngularJs。对于Angular或Angular 2+你可以这样做：

<input [required]="myboolean">

当您的布尔值发生变化时，您也可以在component.ts中动态执行此操作，如下所示：

this.form.get('control-name').setValidators(Validators.required);
this.form.get('control-name').updateValueAndValidity();

删除：

this.form.get('control-name').clearValidators();
this.form.get('control-name').setValidators(/*Rest of the validators if required*/);
this.form.get('control-name').updateValueAndValidity();

Answer 2

// To add validation     
   this.myForm.controls.controlName.setValidators(Validators.required);

// To clear validation
   this.updateForm.controls.controlName.clearValidators();

// In either case, call this method
   this.updateForm.controls.controlName.updateValueAndValidity();

需要角度ng

2 个答案: