【发布时间】：2017-12-11 13:24:55
【问题描述】：
在检查表单是否有效后，我从响应式表单中收到此错误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 angular 4 验证电子邮件字段，但是当我使用 firebase 进行验证检查电子邮件格式是否正确时，错误消失了，任何想法.
【问题讨论】：
标签： angular