无法绑定到"routerLink"，因为它不是已知属性 [英] Can't bind to 'routerLink' since it isn't a known property

问题描述

最近，我已经开始使用angular 2玩了.到目前为止，它很棒.因此，为了开始使用angular-cli进行学习，我启动了一个演示个人项目.

Recently, I have started playing with angular 2. It's awesome so far. So, i have started a demo personal project for the sake of learning using angular-cli.

通过基本的路由设置，我现在想导航到标头中的某些路由，但是由于我的标头是router-outlet的父级，因此我收到此错误.

With the basic routing setup, I now want to navigate to some routes from header, but since my header is a parent to the router-outlet, I receive this error.

app.component.html

<app-header></app-header> // Trying to navigate from this component
    <router-outlet></router-outlet>
<app-footer></app-footer>

header.component.html

  <a [routerLink]="['/signin']">Sign in</a>

现在我部分理解了，因为该组件是router-outlet的包装，因此无法通过这种方式访问​​router.那么，对于这种情况，是否有可能从外部访问导航?

Now I understand partially I guess that since that component is a wrapper around router-outlet it would not be possible this way to access router. So, is there a possibility to access navigation from outside for a scenario like this?

如果需要，我将非常乐意添加更多信息.先感谢您.

I would be really happy to add any more information if needed. Thank you in advance.

更新

1-我的package.json已经具有稳定的@angular/router 3.3.1版本. 2-在我的主要app模块中，导入了routing-module.请参见下面.

1- My package.json already has the stable @angular/router 3.3.1 version. 2- In my main app module, I have imported the routing-module. Please see below.

app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { FormsModule } from '@angular/forms';
import { HttpModule } from '@angular/http';
import { AlertModule  } from 'ng2-bootstrap';
import { LayoutModule } from './layout/layout.module';
import { UsersModule } from './users/users.module';
import { AppRoutingModule } from  './app-routing.module';
import { AppComponent } from './app.component';
import { PageNotFoundComponent } from './shared/components/not-found.component';

@NgModule({
  declarations: [
    AppComponent,
    PageNotFoundComponent
  ],
  imports: [
    BrowserModule,
    FormsModule,
    HttpModule,
    AlertModule.forRoot(),
    LayoutModule,
    UsersModule,
    AppRoutingModule  --> This is the routing module. 
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

app-routing.module.ts

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { SigninComponent } from './users/signin/signin.component';
import { PageNotFoundComponent } from './shared/components/not-found.component';

const routes: Routes = [
{ path: '**', component: PageNotFoundComponent }
];

@NgModule({
    imports: [RouterModule.forRoot(routes)],
    exports: [RouterModule]
})

export class AppRoutingModule {}

我尝试访问的路由是从另一个module(即UsersModule

The route I am trying to access is delegated from another module that is the UsersModule

user-routing.module.ts

import { NgModule } from '@angular/core';
import { RouterModule, Routes } from '@angular/router';
import { SigninComponent } from './signin/signin.component';

const usersRoutes: Routes = [
  { path: 'signin',  component: SigninComponent }
];
@NgModule({
  imports: [
    RouterModule.forChild(usersRoutes)
  ],
  exports: [
    RouterModule
  ]
})

export class UsersRoutingModule { }

虽然我试图从Layout模块一部分的组件中导航，但是没有路由器模块的概念.那是导致错误的原因.

While I am trying to navigate from a component that is part of the Layout module, but has no notion of the router module. Is that what is causing the error.

Layout.module.ts

import { NgModule } from '@angular/core';
import { HeaderComponent } from './header/header.component';
import { FooterComponent } from './footer/footer.component';

@NgModule({
  declarations: [HeaderComponent, FooterComponent],
  exports: [HeaderComponent, FooterComponent]
})
export class LayoutModule{}

我正在尝试从HeaderComponent导航.如果需要，我很乐意提供更多信息.

I am trying to navigate from the HeaderComponent. I would be happy to provide more information if needed.

推荐答案

您需要将RouterModule添加到每个@NgModule()的imports中，其中组件使用任何组件或指令(在本例中为routerLink和<router-outlet>.

You need to add RouterModule to imports of every @NgModule() where components use any component or directive from (in this case routerLink and <router-outlet>.

declarations: []是为了使组件，指令，管道在当前模块内部已知.

declarations: [] is to make components, directives, pipes, known inside the current module.

exports: []用于使组件，指令，管道可用于导入模块.仅添加到declarations的内容是该模块专用的. exports将其公开.

exports: [] is to make components, directives, pipes, available to importing modules. What is added to declarations only is private to the module. exports makes them public.

另请参见 https://angular.io/api/router/RouterModule#usage-笔记

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