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，我开始玩 angular 2.到目前为止它很棒.所以，为了学习使用angular-cli，我开始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，我现在想从 header 导航到一些路由，但由于我的 header 是 router-outlet 的父级，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>

现在我部分理解我猜，因为该组件是 router-outlet 的包装器，所以不可能以这种方式访问​​ router.那么，对于这样的场景，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，我很乐意添加更多信息.提前致谢.

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

更新

1- 我的 package.json 已经有了稳定的 @angular/router 3.3.1 版本.2- 在我的主 app 模块中，我导入了 routing-module.请参阅下文.

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 委托的，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 { }

虽然我试图从属于 Layout 模块的组件进行导航，但没有路由器模块的概念.这就是导致错误的原因.

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

你需要在每个@NgModule()imports中添加RouterModule> 其中组件使用来自的任何组件或指令(在本例中为 routerLink 和 .

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>.

import {RouterModule} from '@angular/router';
@NgModule({
   declarations:[YourComponents],
   imports:[RouterModule]

declarations: [] 是使组件、指令、管道在当前模块中已知.

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

exports: [] 是使组件、指令、管道可用于导入模块.添加到 declarations 的内容仅对模块而言是私有的.exports 将它们公开.

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.

另见https://angular.io/api/router/RouterModule#usage-笔记

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