Inside the root app component, Inject the Router and subscribe to route change events and detect the NavigationStart event with the event type instance, its called NavigationStart.
With the Renderer2 class we can add and remove class to the body as shown below.
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import { Component, Renderer2 } from '@angular/core'; import { Router, NavigationStart } from '@angular/router'; import './operators'; /** * This class represents the main application component. */ @Component({ moduleId: module.id, selector: 'ar-app', templateUrl: 'app.component.html', styleUrls: ['app.component.css'], }) export class AppComponent { previousUrl: string; constructor(private renderer: Renderer2, private router: Router) { this.router.events .subscribe((event) => { if (event instanceof NavigationStart) { if (this.previousUrl) { this.renderer.removeClass(document.body, this.previousUrl); } let currentUrlSlug = event.url.slice(1) if (currentUrlSlug) { this.renderer.addClass(document.body, currentUrlSlug); } this.previousUrl = currentUrlSlug; } }); } } |
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How do you write test for this? Renderer2 seems not to be testable…
I do not have much experience with Angular 2 tests, I have check docs. Let me know if found any solutions