使用Angular 2 ** routerLink **时，如何在HTML链接中添加内容“… <span class=“sr-only”>（当前）</span> ”？

Question

Just wanting to know how include <span class="sr-only">(current)</span> on my clicked active link when using Angular 2 routerLink ?

Example:

<ul class="nav nav-sidebar">
    <li routerLinkActive="active">
        <a routerLink="/dashboard">Dashboard <span class="sr-only">(current)</span></a>
    </li>
    <li>
        <a href="">Registers</a>
    </li>
    <li routerLinkActive="active">
        <a routerLink="/organizations">Organizations</a>
    </li>
</ul>

Sources: Twitter Bootstrap > Accessibility > Skip navigation ANgular 2 > ROUTING & NAVIGATION

Answer 1

In your component, you can add a method isActiveLink like

@Component({
  selector: 'my-app',
  template: `
<ul class="nav nav-sidebar">
    <li routerLinkActive="active">
        <a routerLink="/dashboard">
            Dashboard
            <span *ngIf="isActiveLink('/dashboard')" class="sr-only">(current)</span>
        </a>
    </li>
    <li>
        <a href="">Registers</a>
    </li>
    <li routerLinkActive="active">
        <a routerLink="/organizations">
            Organizations
            <span *ngIf="isActiveLink('/organizations')" class="sr-only">(current)</span>
        </a>
    </li>
</ul>
  `,
  styleUrls: ['app/app.component.css'],
})
export class AppComponent {

  isActiveLink(link:string) {
    return this.router.isActive(link);
  }

  constructor(private router:Router) {}
}

Answer 2

If you want just mark actually active route, you can just add routerLinkActive to directive (you did this), it adding class active to anchor tag, so you can simply style active link in css. If you have something like :

<ul class="nav nav-sidebar">
    <li routerLinkActive="active">
        <a routerLink="/dashboard">Dashboard <span class="sr-only">(current)</span></a>
    </li>
</ul>

you can simply style it, using this:

nav-sidebar li:active {
   background-color: #00CAFE;
}