类型标-“角度框架错误”--“没有将exportAs设置为ngForm的指令”

Question

在使用类型记录的Angular2-forms框架时，我一直收到这个错误：

没有将"exportAs“设置为”directive“的ngForm

这是我的密码

项目依赖关系：

  "dependencies": {
    "@angular/common": "2.0.0-rc.6",
    "@angular/compiler": "2.0.0-rc.6",
    "@angular/core": "2.0.0-rc.6",
    "@angular/forms": "2.0.0-rc.6",
    "@angular/http": "2.0.0-rc.6",
    "@angular/platform-browser": "2.0.0-rc.6",
    "@angular/platform-browser-dynamic": "2.0.0-rc.6",
    "@angular/router": "3.0.0-rc.2",
    "ng2-bootstrap": "^1.1.1",
    "reflect-metadata": "^0.1.8",
    "core-js": "^2.4.0",
    "es6-module-loader": "^0.17.8",
    "rxjs": "5.0.0-beta.11",
    "systemjs": "0.19.27",
    "zone.js": "0.6.17",
    "jquery": "3.0.0",
  }

这是登录模板：

<form #loginForm="ngForm" (ng-submit)="authenticate(loginForm.value)">
</form>

...and登录组件：

import { Component } from '@angular/core';
import {Http, Headers}  from '@angular/http';
@Component({
    moduleId: module.id,
    selector: 'login-cmp',
    templateUrl: 'login.component.html'
})
export class LoginComponent {
  constructor($http: Http) {
    this.$http = $http;
  }
  authenticate(data) {
   ... 
  }
}

我有一个错误：

zone.js?1474211973422:484 Unhandled Promise rejection: Template parse errors:    
There is no directive with "exportAs" set to "ngForm" ("
            <form [ERROR ->]#loginForm="ngForm" 
(ngsubmit)="authenticate(loginForm.value)">

Answer 1

import { FormsModule }   from '@angular/forms';

@NgModule({
  imports: [
             BrowserModule,

             FormsModule      //<----------make sure you have added this.
           ],
  ....
})

Answer 2

您不仅必须将FormsModule导入根AppModule，，还必须导入使用任何角形式指令的每个subModule。

// SubModule A

import { CommonModule } from '@angular/common';
import { FormsModule }   from '@angular/forms';

@NgModule({
  imports: [
    CommonModule,
    FormsModule      //<----------make sure you have added this.
  ],
  ....
})

Answer 3

为了解决此错误，我在ReactiveFormsModule数组中添加了imports[]。

错误:没有将"exportAs“设置为"ngForm”的指令(“

Fix:

module.ts：

import {FormsModule, ReactiveFormsModule} from '@angular/forms'

imports: [
    BrowserModule,
    FormsModule , 
    ReactiveFormsModule
  ],