typescript - 如何在angular2路由器中更改页面标题

Question

我正在尝试从路由器更改页面标题，可以这样做吗？

import {RouteConfig} from 'angular2/router';
@RouteConfig([
  {path: '/home', component: HomeCmp, name: 'HomeCmp' }
])
class MyApp {}

score 60 · Accepted Answer

Title@EricMartinez 指出的服务有一个setTitle()方法 - 这就是设置标题所需的全部内容。

就在路由更改时自动执行此操作而言，到目前为止Router，除了订阅和调用setTitle()您的回调之外，没有内置的方法可以执行此操作：

import {RouteConfig} from 'angular2/router';
import {Title} from 'angular2/platform/browser';

@RouteConfig([
  {path: '/home', component: HomeCmp, name: 'HomeCmp' }
])
class MyApp {
    constructor(router:Router, title:Title) {
       router.events.subscribe((event)=>{ //fires on every URL change
          title.setTitle(getTitleFor(router.url));
       });
    }
 }

也就是说，我强调到目前为止，因为路由器仍在大力开发中，我希望（或至少希望）我们能够RouteConfig在最终版本中做到这一点。

编辑：

随着 Angular 2 (2.0.0) 的发布，一些事情发生了变化：

该Title服务的文档现在在这里：https ://angular.io/docs/ts/latest/api/platform-browser/index/Title-class.html
该服务是从'@angular/platform-browser'

score 16 · Accepted Answer

这是我的方法，效果很好，特别是对于嵌套路由：

在路线更改后，我使用递归辅助方法来获取最深的可用标题：

@Component({
  selector: 'app',
  template: `
    <h1>{{title | async}}</h1>
    <router-outlet></router-outlet>
  `
})
export class AppComponent {
  constructor(private router: Router) {
    this.title = this.router.events
      .filter((event) => event instanceof NavigationEnd)
      .map(() => this.getDeepestTitle(this.router.routerState.snapshot.root));
  }

  title: Observable<string>;

  private getDeepestTitle(routeSnapshot: ActivatedRouteSnapshot) {
    var title = routeSnapshot.data ? routeSnapshot.data['title'] : '';
    if (routeSnapshot.firstChild) {
      title = this.getDeepestTitle(routeSnapshot.firstChild) || title;
    }
    return title;
  }
}

这是假设您在路由的 data 属性中分配了页面标题，如下所示：

{
  path: 'example',
  component: ExampleComponent,
  data: {
    title: 'Some Page'
  }
}

score 13 · Accepted Answer

对于 Angular 4+：

如果您想使用路由自定义数据为每个路由路径定义页面标题，以下方法将适用于嵌套路由和角度版本 4+：

您可以在路由定义中传递页面标题：

  {path: 'home', component: DashboardComponent, data: {title: 'Home Pag'}},
  {path: 'about', component: AboutUsComponent, data: {title: 'About Us Page'}},
  {path: 'contact', component: ContactUsComponent, data: {title: 'Contact Us Pag'}},

现在，在您的上层组件（即AppComponent）中最重要的是，您可以全局捕获每次路由更改的路由自定义数据并更新页面标题：

    import {Title} from "@angular/platform-browser";
    import { filter, map } from 'rxjs/operators';
    export class AppComponent implements OnInit {

        constructor(
            private activatedRoute: ActivatedRoute, 
            private router: Router, 
            private titleService: Title
        ) { }

  ngOnInit() {
    this.router
   .events.pipe(
   filter(event => event instanceof NavigationEnd),
   map(() => {
     let child = this.activatedRoute.firstChild;
     while (child) {
       if (child.firstChild) {
         child = child.firstChild;
       } else if (child.snapshot.data && child.snapshot.data['title']) {
         return child.snapshot.data['title'];
       } else {
         return null;
       }
     }
     return null;
   })).subscribe( (title: any) => {
      this.titleService.setTitle(title);
  });
}

上面的代码针对 Angular 版本 4+ 进行了测试。

score 11 · Accepted Answer

这样做真的很容易，您可以按照以下步骤查看直接效果：

我们在 bootstrap 中提供 Title 服务：

import { NgModule } from '@angular/core';
import { BrowserModule, Title }  from '@angular/platform-browser';

import { AppComponent } from './app.component';

@NgModule({
  imports: [
    BrowserModule
  ],
  declarations: [
    AppComponent
  ],
  providers: [
    Title
  ],
  bootstrap: [ AppComponent ]
})
export class AppModule { }

然后在你想要的组件中导入这个服务：

import { Component } from '@angular/core';
import { Title }     from '@angular/platform-browser';

@Component({
selector: 'my-app',
template:
  `<p>
    Select a title to set on the current HTML document:
  </p>

  <ul>
    <li><a (click)="setTitle( 'Good morning!' )">Good morning</a>.</li>
    <li><a (click)="setTitle( 'Good afternoon!' )">Good afternoon</a>.</li>
    <li><a (click)="setTitle( 'Good evening!' )">Good evening</a>.</li>
  </ul>
  `
})
export class AppComponent {
  public constructor(private titleService: Title ) { }

  public setTitle( newTitle: string) {
    this.titleService.setTitle( newTitle );
  }
}

现在单击这些链接以查看标题更改。

你也可以使用 ng2-meta 来改变页面标题和描述，你可以参考这个链接：

https://github.com/vinaygopinath/ng2-meta

score 5 · Accepted Answer

Angular 2 提供了标题服务，请参阅 Shailesh 的答案只是该代码的副本。

我我们的 app.module.ts

import { BrowserModule, Title } from '@angular/platform-browser';
........
providers: [..., Title],
bootstrap: [AppComponent]

现在转到我们的 app.component.ts

import { Title }     from '@angular/platform-browser';
......
export class AppComponent {

    public constructor(private titleService: Title ) { }

    public setTitle( newTitle: string) {
      this.titleService.setTitle( newTitle );
    }
}

将标题标签放在您的组件 html 上，它将为您读取和设置。

如果您想知道如何动态设置它和更多详细信息，请参阅这篇文章

score 3 · Accepted Answer

import {Title} from "@angular/platform-browser"; 
@Component({
  selector: 'app',
  templateUrl: './app.component.html',
  providers : [Title]
})

export class AppComponent implements {
   constructor( private title: Title) { 
     this.title.setTitle('page title changed');
   }
}

score 3 · Accepted Answer

这就是我的选择：

constructor(private router: Router, private title: Title) { }

ngOnInit() {
    this.router.events.subscribe(event => {
        if (event instanceof NavigationEnd) {
            this.title.setTitle(this.recursivelyGenerateTitle(this.router.routerState.snapshot.root).join(' - '));
        }
    });
}

recursivelyGenerateTitle(snapshot: ActivatedRouteSnapshot) {
    var titleParts = <string[]>[];
    if (snapshot) {
        if (snapshot.firstChild) {
            titleParts = titleParts.concat(this.recursivelyGenerateTitle(snapshot.firstChild));
        }

        if (snapshot.data['title']) {
            titleParts.push(snapshot.data['title']);
        }
    }

    return titleParts;
}

score 3 · Accepted Answer

Angular 6+ 我已经使用 new Pipe() 修改了旧代码并且它工作正常。

import { Title } from '@angular/platform-browser';
import { filter, map, mergeMap } from 'rxjs/operators';

...

constructor(
    private router: Router,
    public activatedRoute: ActivatedRoute,
    public titleService: Title,
  ) {
    this.setTitle();
  }

……

setTitle() {
  this.router.events.pipe(
    filter((event) => event instanceof NavigationEnd),
    map(() => this.activatedRoute),
    map((route: any) => {
      while (route.firstChild) route = route.firstChild;
      return route;
    }),
    filter((route) => route.outlet === 'primary'),
    mergeMap((route: any) => route.data)).subscribe((event) => {
      this.titleService.setTitle(event['title']);
      console.log('Page Title', event['title']);
    })
  }

score 2 · Accepted Answer

这是在导航页面/视图时更改页面标题的最简单方法（从 Angular @2.3.1 开始测试）。只需将以下解决方案应用于您拥有的所有视图，您应该一切顺利：

关于我们页面/视图中的示例代码：

import {Title} from "@angular/platform-browser";

export class AboutUsComponent implements OnInit {

  constructor(private _titleService: Title) {
  }

  ngOnInit() {
    //Set page Title when this view is initialized
    this._titleService.setTitle('About Us');
  }

}

联系我们页面/视图中的示例代码：

import {Title} from "@angular/platform-browser";

export class ContactusComponent implements OnInit {

  constructor(private _titleService: Title) {
  }

  ngOnInit() {
    //Set page Title
    this._titleService.setTitle('Contact Us');
  }

}

score 2 · Accepted Answer

在下面的示例中：

-我们将数据对象：{title：'NAME'}添加到任何路由对象。

-我们为上传时间设置了一个基本名称（“CTM”）（点击F5进行刷新时..）<title>CTM</title>：。

-我们添加了“TitleService”类。

- 我们通过从 app.component.ts 过滤它们来处理 Routher 事件。

索引.html：

<!DOCTYPE html>
<html>
  <head>
    <base href="/">
    <title>CTM</title>
  </head>

...

app.module.ts：

import { NgModule, enableProdMode } from '@angular/core';
import { BrowserModule  } from '@angular/platform-browser';
import { TitleService }   from './shared/title.service';
...


@NgModule({
  imports: [
    BrowserModule,
..
  ],
  declarations: [
      AppComponent,
...
  ],
  providers: [
      TitleService,
...
  ],
  bootstrap: [AppComponent],
})
export class AppModule { }

enableProdMode();

标题.service.ts：

import { Injectable } from '@angular/core';
import { Title }  from '@angular/platform-browser';
import { ActivatedRouteSnapshot } from '@angular/router';


@Injectable()
export class TitleService extends Title {

    constructor() {
        super();
    }


    private recursivelyGenerateTitle(snapshot: ActivatedRouteSnapshot) {
        var titleParts = <string[]>[];
        if (snapshot) {
            if (snapshot.firstChild) {
                titleParts = this.recursivelyGenerateTitle(snapshot.firstChild);
            }

            if (snapshot.data['title']) {
                titleParts.push(snapshot.data['title']);
            }
        }

        return titleParts;
    }

    public CTMGenerateTitle(snapshot: ActivatedRouteSnapshot) {
        this.setTitle("CTM | " + this.recursivelyGenerateTitle(snapshot).join(' - '));
    }

}

应用程序路由.module.ts：

import { Injectable } from '@angular/core';
import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';

import { MainComponent } from './components/main.component';

import { Router, CanActivate } from '@angular/router';
import { AuthGuard }          from './shared/auth/auth-guard.service';
import { AuthService }    from './shared/auth/auth.service';


export const routes: Routes = [
  { path: 'dashboard', component: MainComponent, canActivate: [AuthGuard], data: { title: 'Main' } },
];

@NgModule({
    imports: [
        RouterModule.forRoot(routes, { useHash: true })  // .../#/crisis-center/
    ],
    exports: [RouterModule],
    providers: [
..
    ]
})

export class AppRoutingModule { }

export const componentsOfAppRoutingModule = [MainComponent];

app.component.ts：

import { Component } from '@angular/core';
import { Router, NavigationEnd, ActivatedRouteSnapshot } from '@angular/router';
import { TitleService } from './shared/title.service';

@Component({
  selector: 'ctm-app',
  template: `
    <!--<a [routerLink]="['/dashboard']">Dashboard</a>
    <a [routerLink]="['/login']">Login</a>
    <a [routerLink]="['/']">Rooting</a>-->
    <router-outlet></router-outlet>
    `
})
export class AppComponent {

    constructor(private router: Router, private titleService: TitleService) {

        this.router.events.filter((event) => event instanceof NavigationEnd).subscribe((event) => {
            console.log("AppComponent.constructor: Setting HTML document's Title");
            this.titleService.CTMGenerateTitle(this.router.routerState.snapshot.root);
        });

    }


}

score 2 · Accepted Answer

在 Angular 6 和 6+ 中使用 Pipe 和 map 方法而不是使用过滤器可以正常工作

Step1：路由设置

{path: 'dashboard', component: DashboardComponent, data: {title: 'My Dashboard'}},
{path: 'aboutUs', component: AboutUsComponent, data: {title: 'About Us'}},
{path: 'contactUs', component: ContactUsComponent, data: {title: 'Contact Us Page'}},

step2：在你的 app.module.ts 导入模块

import { BrowserModule, Title } from '@angular/platform-browser';

然后在提供者中添加提供者：[title]

第 3 步 在您的主要组件导入中

import { Title } from "@angular/platform-browser";
import { RouterModule, ActivatedRoute, Router, NavigationEnd } from "@angular/router";
import { filter, map } from 'rxjs/operators';

constructor(private titleService: Title, private router: Router, private activatedRoute: ActivatedRoute) {

    }

ngOnInit() {

    this.router.events.pipe(map(() => {
        let child = this.activatedRoute.firstChild;
        while (child) {
            if (child.firstChild) {
                child = child.firstChild;
            } else if (child.snapshot.data && child.snapshot.data['title']) {
                return child.snapshot.data['title'];
            } else {
                return null;
            }
        }
        return null;
    })).subscribe(title => {
        this.titleService.setTitle(title);
    });

}

score 0 · Accepted Answer

角度 6+

如果路由配置如下：-

Routes = [
     {  path: 'dashboard',
       component: DashboardComponent,
       data: {title: 'Dashboard'}
   }]

**然后可以在组件构造函数中设置标题如下：- **

 constructor( private _titleService: Title, public activatedRoute: ActivatedRoute) {
    activatedRoute.data.pipe(map(data => data.title)).subscribe(x => this._titleService.setTitle(x));
   }

score 0 · Accepted Answer

我还可以推荐我刚刚发布的@ngx-meta/core插件插件，以防您正在寻找一种动态设置页面标题和元标记的方法。

score 0 · Accepted Answer

设置标题的简单通用方法：

import { Component } from '@angular/core';
import { Title } from '@angular/platform-browser';
import { ActivatedRoute, Router, NavigationEnd } from '@angular/router';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {

  constructor(
    private activatedRoute: ActivatedRoute,
    private router: Router,
    private titleService: Title
    ) {}

  ngOnInit() {
    this.router.events.subscribe(event => {
      if (event instanceof NavigationEnd) {
        const { title } = this.activatedRoute.firstChild.snapshot.data;
        this.titleService.setTitle(title);
      }
    });
  }

}

需要title在每条路线上设置的位置，例如：

{ path: '', component: WelcomeComponent, data: {title: 'Welcome to my app'} }

typescript - 如何在angular2路由器中更改页面标题

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