角度材料:尽管有真正的方法,但是没有显示出来的错误

Question

我有一个确认密码formcontrol,我想验证.

当密码与确认密码输入中的值不同时,我想显示我的mat-error元素.为此我有一个叫做的函数equalPasswords().如果函数是相同的,那么我们收到true,如果没有,我们收到false.

<mat-form-field>
              <input matInput placeholder="Repeat password" [formControl]="password2" type="password">
              <mat-error *ngIf="password2.invalid && password2.hasError('required')">Password is required</mat-error>
              <mat-error *ngIf="!equalPasswords() && !password2.hasError('required')">Passwords need to match</mat-error>
</mat-form-field>

我检查了控制台,当我在密码框中输入两个不同的输入时,equalPasswords()返回false.但是它仍然没有显示DOM中的错误.

有人知道如何解决这个问题吗？

Signup.component.ts

@Component({
    selector: 'app-sign-up',
    templateUrl: 'sign-up.component.html',
    styleUrls: ['sign-up.component.css']
})

export class SignUpComponent implements OnInit {

    mySignupForm: FormGroup;
    countries = countries;
    uniqueUsernameMessage;
    uniqueEmailMessage;
    formSubmitted = false;
    @Output() closeSubmenu = new EventEmitter();
    @ViewChild('select') select;

    constructor(
        private authService: AuthenticationService,
        private route: Router,
        private navigationService: NavigationService){}

    get firstName() { return this.mySignupForm.get('firstName'); }
    get lastName() { return this.mySignupForm.get('lastName'); }
    get username() { return this.mySignupForm.get('username'); }
    get email() { return this.mySignupForm.get('email'); }
    get password1() { return this.mySignupForm.get('password1'); }
    get password2() { return this.mySignupForm.get('password2'); }
    get birthDate() { return this.mySignupForm.get('birthDate'); }
    get country() { return this.mySignupForm.get('country'); }
    get house() { return this.mySignupForm.get('house'); }

    ngOnInit() {
        this.mySignupForm = new FormGroup({
            firstName: new FormControl(null, Validators.required),
            lastName: new FormControl(null, Validators.required),
            username: new FormControl(null, [Validators.required, Validators.minLength(5), Validators.maxLength(15)]),
            birthDate: new FormControl(null, Validators.required),
            password1: new FormControl(null, [Validators.required, Validators.minLength(6), Validators.maxLength(15), Validators.pattern('^.*(?=.{4,10})(?=.*\\d)(?=.*[a-zA-Z]).*$')]),
            password2: new FormControl(null, Validators.required),
            email: new FormControl(null, [Validators.required, Validators.email]),
            country: new FormControl(null, Validators.required),
            house: new FormControl(null, Validators.required)
        })
    }

    equalPasswords() {

        console.log('equaltest', this.password1.value === this.password2.value);
        return this.password1.value === this.password2.value;
    }

}

Answer 1

MatFormField仅mat-error在FormControl出现错误时显示元素.它不会仅仅因为你告诉它通过显示ngIfElse- 它只能在表单控件状态下工作.解决此问题的一种方法是创建自定义验证器并使用它来检查密码是否匹配.您还可以在equalPasswords()函数中设置字段错误.这应该是这样的:

equalPasswords(): boolean {

    const matched: boolean = this.password1.value === this.password2.value;

    console.log('equaltest', matched);

    if (matched) {
        this.signupForm.controls.password2.setErrors(null);
    } else {
        this.signupForm.controls.password2.setErrors({
           notMatched: true
        });
    }

    return matched;
}