无论使用 ActivatedRoute 的路由嵌套级别如何，都可以检索 Angular2 路由上的数据属性

问题描述

我定义了一些路由如下:

I have defined a number of routes as follows:

export const AppRoutes: Routes = [
  {path: '', component: HomeComponent, data: {titleKey: 'homeTitle'}},
  {path: 'signup', component: SignupComponent, data: {titleKey: 'SIGNUP_FORM.TITLE'}},
  {path: 'signin', component: SigninComponent, data: {titleKey: 'SIGNIN_FORM.TITLE'}},
  {path: 'sendpasswordresetinformation', component: SendPasswordResetInformationComponent},
  {path: 'password/reset/:userAccountToken', component: PasswordResetComponent},
  {
    path: 'dashboard', component: DashboardComponent, children: [
    {path: '', component: DashboardSummaryComponent},
    {
      path: 'message', children: [
      {path: '', component: MessageSummaryComponent, data: {titleKey: 'MESSAGE_LIST.TITLE'}},
      {path: 'conversation/:otherId', component: MessageConversationComponent, data: {titleKey: 'XXX'}}]
    },
    {
      path: 'useraccount', component: UserAccountComponent, children: [
      {
        path: '',
        component: UserAccountSummaryComponent,
        data: {titleKey: 'XXX'},
        resolve: {
          userAccount: UserAccountResolve
        }
      },
      {path: 'address', component: UserAccountAddressComponent, data: {titleKey: 'ADDRESS_FORM.TITLE'}},
      {path: 'email', component: UserAccountEmailComponent, data: {titleKey: 'EMAIL_FORM.TITLE'}},
      {
        path: 'emailnotification',
        component: UserAccountEmailNotificationComponent,
        data: {titleKey: 'EMAIL_NOTIFICATION_FORM.TITLE'}
      },
      {path: 'firstname', component: UserAccountFirstNameComponent, data: {titleKey: 'FIRST_NAME_FORM.TITLE'}},
      {path: 'password', component: UserAccountPasswordComponent, data: {titleKey: 'PASSWORD_FORM.TITLE'}}]
    }]
  }];

有些路线是其他路线的子路线.

Some of the routes are children of others.

我想找到一种方法来检索 data 上的 titleKey 属性，而不管该路由是顶级路由还是另一个路由的子路由.

I would like to find a way to retrieve the titleKey property on data regardless of whether the route is a top level route or the child of another.

这是我尝试过的:

export class AppComponent implements OnInit {

  constructor(private translate: TranslateService,
              private sessionService: SessionService,
              private titleService: Title,
              private activatedRoute: ActivatedRoute) {
    let userLang = 'fr';
    translate.use(userLang);
    moment.locale(userLang);
  }

  ngOnInit() {
    this.sessionService.reloadPersonalInfo();
  }

  setTitle($event) {
    this.translate.get(this.activatedRoute.snapshot.data['titleKey'])
     .subscribe(translation=>this.titleService.setTitle(translation));
  }
}

this.activatedRoute.snapshot.data['titleKey'] 是 未定义.

有人可以建议如何在路由 data 上检索属性，而不管路由的嵌套级别如何?

Can someone please advise how to retrieve a property on route data regardless of the level of nesting of the route?

编辑:看完官方关于 ActivatedRoute 的角度文档，我尝试在 ActivatedRoute 实例的 data 属性上使用 map 运算符，如下所示:

edit: After reading the official angular documentation about ActivatedRoute, I tried to use the map operator on the data property of the ActivatedRoute instance as follows:

@Component({
  selector: 'app',
  template: `
              <section class="container-fluid row Conteneur">
                 <appNavbar></appNavbar>
                 <section class="container">
                    <router-outlet (activate)="setTitle($event)"></router-outlet>
                 </section>
              </section>
              <section class="container-fluid">
                <appFooter></appFooter>
              </section>
              `,
  directives: [NavbarComponent, FooterComponent, SigninComponent, HomeComponent, ROUTER_DIRECTIVES]
})
export class AppComponent implements OnInit {

  constructor(private translate: TranslateService,
              private sessionService: SessionService,
              private titleService: Title,
              private activatedRoute: ActivatedRoute) {
    let userLang = 'fr';
    translate.use(userLang);
    moment.locale(userLang);
  }

  ngOnInit() {
    this.sessionService.reloadPersonalInfo();
  }

  setTitle($event) {
    this.activatedRoute.data.map(data=>data['titleKey'])
      .do(key=>console.log(key))
      .switchMap(key=>this.translate.get(key))
      .subscribe(translation=>this.titleService.setTitle(translation));
  }
}

然而 key 总是未定义...

and yet key is always undefined...

推荐答案

我偶然发现了一个很好的教程，里面有一个干净的解决方案:https://toddmotto.com/dynamic-page-titles-angular-2-router-events.

I stumbled on a nice tutorial with a clean solution: https://toddmotto.com/dynamic-page-titles-angular-2-router-events.

这是我最终想出的使用上述教程中的解决方案并使用 ng2 翻译服务 以便将我的路线数据中指定的 titleKeys 转换为正确的标签:

Here is what I finally came up with using the solution from the above tutorial and using the ng2 translate service in order to convert the titleKeys specified in my route data into proper labels:

@Component({
  selector: 'app',
  encapsulation: ViewEncapsulation.None,
  styleUrls: ['../styles/bootstrap.scss'],
  template: `<section class="container-fluid row Conteneur">
                 <app-navbar></app-navbar>
                 <section class="container">
                    <router-outlet></router-outlet>
                 </section>
              </section>
              <section class="container-fluid">
                <app-footer></app-footer>
              </section>`
})
export class AppComponent implements OnInit {

  constructor(private translate: TranslateService,
              private sessionSigninService: SessionSigninService,
              private titleService: Title,
              private router: Router,
              private activatedRoute: ActivatedRoute) {
    let userLang = 'fr';
    translate.use(userLang);
    moment.locale(userLang);
  }

  ngOnInit() {

    this.router.events
      .filter(event => event instanceof NavigationEnd)
      .map(() => this.activatedRoute)
      .map(route => {
        while (route.firstChild) route = route.firstChild;
        return route;
      })
      .filter(route => route.outlet === 'primary')
      .mergeMap(route => route.data)
      .mergeMap(data => this.translate.get(data['titleKey']))
      .subscribe(translation => this.titleService.setTitle(translation));
  }
}

这篇关于无论使用 ActivatedRoute 的路由嵌套级别如何，都可以检索 Angular2 路由上的数据属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！