Angular2 ngForm不起作用 [英] Angular2 ngForm not working

问题描述

我正在尝试做一个登录表单组件，但是我无法读取表单数据.

I am trying to do a login form component but I cannot read the form data.

当我尝试在控制台上写用户名时，会写'undefined'.

When I try to write username on the console, 'undefined' writes.

一切似乎都很平常，但是表单数据并没有包含在内.

Everything seems usual but form data does not come to component.

下面是html代码:

<form (ngSubmit)="onSubmit(myForm)"
      #myForm="ngForm"
      class="form-signin">
    <div class="form-group">
        <h2 class="form-signin-heading">Please sign in</h2>
        <input type="text"
               id="inputUsername"
               name="inputUsername"
               class="form-control"
               placeholder="User Name"
               required>
        <input type="password"
               id="inputPassword"
               name="inputPassword"
               class="form-control"
               placeholder="Password" >
    </div>
    <button class="btn btn-lg btn-primary btn-block"
            type="submit">Sign in</button>
</form>

组件ts:

@Component({
    selector: 'signin',
    templateUrl: './signin.component.html',
    encapsulation: ViewEncapsulation.None
})
export class SigninComponent implements OnInit{
    constructor(){}

    ngOnInit(){ }

    onSubmit(form: NgForm){
        console.log(form.value.inputUsername);
    }
}

谢谢.

推荐答案

您需要将ngModel指令添加到每个表单字段中.这会将表单字段注册到您的表单中.

You need to add the ngModel directive to each of the form fields. This registers the form fields to your form.

    <input type="text"
           id="inputUsername"
           name="inputUsername"
           class="form-control"
           placeholder="User Name"
           ngModel
           required>

这篇关于Angular2 ngForm不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！