Angular2(ngSubmit)不起作用

Question

我刚刚启动 Angular2 并在添加 时遇到以下错误(ngSubmit) 归因于我的表单

Template parse errors:
There is no directive with "exportAs" set to "ngForm" ("


    <form [ERROR ->]#form="ngForm" (ngSubmit)="onSubmit()" novalidate>

以下是我在 package.json 中的一些依赖项。

"dependencies": {
    "@angular/common": "2.0.0",
    "@angular/compiler": "2.0.0",
    "@angular/core": "2.0.0",
    "@angular/forms": "2.0.0",
    "@angular/http": "2.0.0",
    "@angular/platform-browser": "2.0.0",
    "@angular/platform-browser-dynamic": "2.0.0",
    "@angular/router": "3.0.0",
    "@angular/upgrade": "2.0.0",
    "angular2-in-memory-web-api": "0.0.20",
    "core-js": "^2.4.1",
    "ie-shim": "^0.1.0",
    "jquery": "^3.1.0",
    "reflect-metadata": "^0.1.3",
    "rxjs": "5.0.0-beta.12",
    "systemjs": "0.19.27",
    "zone.js": "^0.6.23"
  }

我遵循了 html 表单。

<form #form="ngForm" (ngSubmit)="onSubmit()" novalidate>

    <div class="form-group">
        <label>Title</label>
        <input [(ngModel)]="model.Title" #title="ngModel" name="title" id="title" type="text" class="form-control" value="">
    </div>

    <div class="form-group">
        <label>Description</label>
        <textarea [(ngModel)]="model.Description" #description="ngModel" class="summernote form-control" name="description" id="description"></textarea>
    </div>

</form>

并关注 类别.组件文件

import { Component } from '@angular/core';
import { FormBuilder} from '@angular/forms';
import { Category } from '../../../models/cms/Category';

@Component({
    selector: 'category',
    templateUrl: 'category.template.html'
})
export class CategoryComponent{

    model = new Category("dummyTitle","dummyDescription");

    onSubmit() {
        console.log(this.data);
    }   
}

有人可以指导如何处理这个问题。

Answer 1

您缺少导入文件 import { NgForm } from '@angular/forms';
并且您正在使用模板驱动的表单，因此您不需要 FormBuilder。

试试这个方法

注册-form.component.html

<form #signupForm="ngForm" (ngSubmit)="registerUser(signupForm)">
  <label for="email">Email</label>
  <input type="text" name="email" id="email" ngModel>

  <label for="password">Password</label>
  <input type="password" name="password" id="password" ngModel>

  <button type="submit">Sign Up</button>
</form>

注册-form.component.ts

import { Component } from '@angular/core';
import { NgForm } from '@angular/forms';

@Component({
  selector: 'signup-form',
  templateUrl: 'app/signup-form.component.html',
})
export class SignupForm {
  registerUser(form: NgForm) {
    console.log(form.value);
  }
}