angularjs – 从Angular 2中的路由子组件更新父组件标题

参见英文答案 > how to change page title in angular2 router12个
我正在努力完成 Angular 2 documentation on routing.我有一个示例应用程序,它显示了两个组件,这些组件被路由并连接到导航链接. Here is a Plunker展示了这种行为.它是在Typescript中使用Angular 2构建的.

这是主要的’app.component.ts’代码：

import {Component} from 'angular2/core';
import {RouteConfig,ROUTER_DIRECTIVES} from 'angular2/router';

import {CrisisCenterComponent} from './crisis-center/crisis-center.component';
import {HeroListComponent}     from './heroes/hero-list.component';
import {HeroDetailComponent}   from './heroes/hero-detail.component';

import {DialogService}         from './dialog.service';
import {HeroService}           from './heroes/hero.service';

@Component({
  selector: 'my-app',template: `
    <h1 class="title">Component Router</h1>
    <nav>
      <a [routerLink]="['CrisisCenter']">Crisis Center</a>
      <a [routerLink]="['Heroes']">Heroes</a>
    </nav>
    <router-outlet></router-outlet>
  `,providers:  [DialogService,HeroService],directives: [ROUTER_DIRECTIVES]
})

@RouteConfig([

  { // Crisis Center child route
    path: '/crisis-center/...',name: 'CrisisCenter',component: CrisisCenterComponent,useAsDefault: true
  },{path: '/heroes',name: 'Heroes',component: HeroListComponent},{path: '/hero/:id',name: 'HeroDetail',component: HeroDetailComponent},{path: '/disaster',name: 'Asteroid',redirectTo: ['CrisisCenter','CrisisDetail',{id:3}]}
])

export class AppComponent { }

我要做的是将主要(< h1>)标题’Component Router’替换为正在呈现的’view’的名称.因此,当您点击“危机中心”时,标题应该是“危机中心”;当你点击“英雄”时,标题应该是“英雄”.

我不想将标题移动到子组件模板中 – 我希望将其保留在HTML页面的顶部,最好只保留在一个模板中.

任何人都可以建议最好的(最像Angular-docs)方式来实现这一目标吗？

非常感谢.

import {Injectable} from 'angular2/core';
import {Subject} from 'rxjs/Rx';

@Injectable()
export class RouteNames{
  public name = new Subject();
}

import {RouteNames} from './route-names.service';
bootstrap(AppComponent,[ROUTER_PROVIDERS,RouteNames]);

import {RouteNames} from './route-names.service';
@Component({
  selector: 'my-app',template: `
    <h1 class="title">{{routeName}}</h1>
    <nav>
      <a [routerLink]="['CrisisCenter']">Crisis Center</a>
      <a [routerLink]="['Heroes']">Heroes</a>
    </nav>
    <router-outlet></router-outlet>
  `,...
})
@RouteConfig([
   ...
])
export class AppComponent {
  routeName = "Component Router";
  constructor(private _routeNames:RouteNames){
    this._routeNames.name.subscribe(n => this.routeName = n);
  }
}

@Component({
  ...
})
@RouteConfig([
  ...
])
export class CrisisCenterComponent {
  constructor(private _routeNames:RouteNames){
    _routeNames.name.next('Crisis Center');
  }
}