Question

我按照角度2教程尝试以角度2形式实现验证。见代码：

<form #loginForm="ngForm" (ngSubmit)="login()">
    <div>
        <label for="email">Email:</label>
        <input type="text" id="email" name="email" required minlength="4" maxlength="24" [(ngModel)]="emailField" #name="ngModel" />
        <div *ngIf="email?.errors && (email?.dirty || email?.touched)" class="alert alert-danger">
            <div [hidden]="!email.errors.required">
              email is required
            </div>
            <div [hidden]="!email.errors.minlength">
              email must be at least 4 characters long.
            </div>
            <div [hidden]="!email.errors.maxlength">
              Name cannot be more than 24 characters long.
            </div>
        </div>
    </div>  
    <div>
        <label>Password:</label><input type="password" name="password" [(ngModel)]="passwordField" />
    </div>
    <div>
        <button [disabled]="!loginForm.form.valid" type="submit">Submit</button>
    </div>
</form>

问题是我收到此错误代码：

ERROR Error: Uncaught (in promise): TypeError: Cannot read property 'errors' of undefined

我尝试完全按照官方网站上的教程实现它：https://angular.io/docs/ts/latest/cookbook/form-validation.html#!#template1

Answer 1

答案（感谢George K）是我不小心写了#name="ngModel"而不是#email="ngModel"

角度2表单验证给出未定义的错误消息

1 个答案: