如果在模板驱动形式Angular 4中它无效,为什么class不应用于input元素？

Question

我在登录页面使用了模板驱动的表单.我想在输入元素上有一个红色边框,如果它们无效或有任何错误,borderRed但当输入为空或无效时,该类没有添加到输入元素上.

<form (ngSubmit)="f.form.valid && signin()" #f="ngForm" class="m-login__form m-form" action="">
  <ng-template #alertSignin></ng-template>

  <div class="form-group form-md-line-input form-md-floating-label">
    <label>
      Email <span class="text-danger">*</span>
    </label>
    <input [class.borderRed]="email.invalid" class="form-control m-input" type="text" required="required" name="email" [(ngModel)]="model.email" #email="ngModel" autocomplete="off">
  </div>

  <div class="form-group form-md-line-input form-md-floating-label">
    <label [pTooltip]="attachementTooltipmsg" tooltipPosition="top" for="form_control_1">
      Password <span class="text-danger">*</span>
    </label>
    <input [class.borderRed]="password.invalid" class="form-control m-input" required="" name="password" type="password" [(ngModel)]="model.password" #password="ngModel">
  </div>

  <div class="m-login__form-action">
    <button [disabled]="loading" [ngClass]="{'m-loader m-loader--right m-loader--light': loading}" id="m_login_signin_submit" class="btn btn-focus m-btn m-btn--pill m-btn--custom m-btn--air">
      Sign In
    </button>
  </div>
</form>

Answer 1

这应该有效

<input [ngClass]="{'borderRed':email.invalid}" class="form-control m-input" type="text" required="required" name="email" [(ngModel)]="model.email" #email="ngModel" autocomplete="off">