Question

在检查表单是否有效后，我从反应形式中得到此错误ExpressionChangedAfterItHasBeenCheckedError: Expression has changed after it was checked. Previous value: 'false'. Current value: 'true'.。

creatForm

  public createForm() {
    this.loginForm = new FormGroup({
      email: new FormControl('', [
        Validators.required,
        this.patternValidator(/^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/)
      ]),
      password: new FormControl('', [
        Validators.required,
        Validators.minLength(6)
      ])
    });
    this.guestForm = new FormGroup({
      guestName: new FormControl('', [
        Validators.required
      ]),
      guestCode: new FormControl('', [
        Validators.required,
        Validators.minLength(8)
      ])
    });
  }

这是表格

    <form [formGroup]="loginForm" (ngSubmit)="couplelogin(user)" novalidate>
      <div id="couple_login_form" class="login-form">
        <div class="login-field" [ngClass]="{'pattern' : !loginForm.controls.email.valid && loginForm.controls.email.touched, 'error' : loginForm.controls.email.pristine && loginForm.controls.email.touched, 'focus' : loginForm.controls.email.dirty}">
          <label for="email_login" translate="HOME.EMAIL_FORM">E-Mail</label>
          <input type="email" formControlName="email" [(ngModel)]="user.email" name="email">
          <div class="message text-center">
            <p translate="HOME.FORM_REQUIRED">This field is required</p>
          </div>
          <div class="pattern text-center">
            <p translate="HOME.ERROR_FORMAT">Enter a valid email.</p>
          </div>
        </div>
        <div class="login-field" [ngClass]="{'error' : loginForm.controls.password.pristine && loginForm.controls.password.touched, 'focus' : loginForm.controls.password.dirty}">
          <label for="pass_login" translate="HOME.PASSWOR_FORM">Password</label>
          <input type="password" [(ngModel)]="user.password" name="password" formControlName="password">
          <div class="message text-center">
            <p translate="HOME.FORM_REQUIRED">This field is required</p>
          </div>
        </div>
        <p class="text-center bottom-msg-login" translate="HOME.FORM_MESSAGE">Don't have an account yet? Download the app für Android or iOS, sign in and create your wedding!</p>
        <button class="submit" type="submit" name="couple" [disabled]="!loginForm.valid" translate="HOME.LOGIN">Login</button>
      </div>
    </form>

现在，我正在使用firebase进行用户身份验证，我正在使用角度4验证电子邮件字段，但是当我进行验证检查电子邮件格式是否与firebase正确时，错误消失了，任何想法

Answer 1

对于验证电子邮件，您可以执行此操作

    'email': [null, [
        Validators.required, Validators.email
    ]],

然后删除所有[(ngModel)]="user.XXX"和name="XXX"

并更改

<form [formGroup]="loginForm" (ngSubmit)="couplelogin(loginForm.value)">

检查错误后角度4表达发生了变化

1 个答案: