首页 > 解决方案 > 角度表单验证不显示错误消息

问题描述

如果密码或电子邮件无效,我正在运行登录表单以显示错误到目前为止,这就是我所拥有的

<form [formGroup]="loginForm" (ngSubmit)="SignIn(email.value, password.value)">
  <mat-form-field>
    <input formControlName="email" name="email" matInput type="text" placeholder="email">
  </mat-form-field>
  <mat-form-field>
    <input formControlName="password" name="password" matInput type="password" placeholder="Password">
  </mat-form-field>
  <div *ngIf="errorCode" class="notification is-danger">
    Email and password does not match
  </div>
  <div class="d-flex flex-column align-items-center">
    <button mat-raised-button  class="button is-success w-100" type="submit" [disabled]="!loginForm.valid">
      Continue
    </button>
  </div>
</form>

在我的 ts

 ngOnInit() {
    this.loginForm = this.fb.group({
      email: ['', [
        Validators.required,
        Validators.pattern('^[a-zA-Z0-9_.+-]+@[a-zA-Z0-9-]+.[a-zA-Z0-9-.]+$')
      ]],
      password: ['',
        Validators.required
      ],
    });
  }
SignIn(email, password) {
    return this.afAuth.auth.signInWithEmailAndPassword(email, password)
      .then((result) => {
          this.ngZone.run(() => {
          this.router.navigate(['dashboard']);
        });
      }).catch((error) => {
        this.errorCode= error.message;
        console.log(this.errorCode)
      })
  }

但是,当我提交无效用户时,似乎没有显示错误消息。以前我已经测试过

<div *ngIf="!loginForm.valid" class="notification is-danger">
   Email and password does not match
  </div>

但问题是它仅根据填充字段的位置显示,而不是验证字段本身。

标签: angularvalidationangularfireangular-forms

解决方案


这是一个很长的镜头,但是,您将错误分配给组件,并且通常只有在您changeDetection: ChangeDetectionStategy.OnPush在组件定义中声明时才会失败。如果是这样,您只需constructor(private cd: ChangeDetectorRef) {}在块中分配错误值后注入更改检测器引用并使用它.catch,如下所示:

}).catch((error) => {
 this.errorCode= error.message;
 console.log(this.errorCode)
 this.cd.detectChanges();
})

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