Angular 2: Dynamically Adjusting View Components Based on URL Path

Apologies for the unconventional title. I struggled to come up with a better one.

My goal is to develop an application with a simple 3-part structure (header / content / footer). The header should change based on the active route, where each header is a separate component. Currently, the header display is controlled by an [ngSwitch] statement in the "mainApp.component" as follows:

<span [ngSwitch]="currentLocation">
    <span *ngSwitchWhen="'/login'"><login-header></login-header></span>
    <span *ngSwitchWhen="'/home'"><home-header></home-header></span>
</span>
<div class="content"><router-outlet></router-outlet></div>
<app-footer></app-footer>

The code snippet above showcases how the "mainApp.component.ts" file manages the current location and displays the appropriate header depending on the active route. However, a challenge arises when changing routes programmatically, such as through a button click using:

<span class="btn btn-default headerButton homeButton" (click)="navigateToHome()"></span>

In this scenario, even though we update the route to "/home", the header does not refresh due to a lack of proper change detection in the mainApp.component.

One potential solution could be moving the header logic into each respective component's template, although I would prefer to keep it centralized in the main component if possible.

If anyone has any insights on improving this setup or knows of a best practice approach to address this issue, your input would be greatly appreciated.

Thank you.

Answer №1

If you want to keep track of router events, one solution is to subscribe to them in the following way:

this.router.events.subscribe((e) => {e instanceof NavigationEnd? this.currentLocation = '/' + e.url.split('/')[1] : ''});

By subscribing to the router events, you can update the currentLocation variable whenever a successful navigation ends by examining the url property.

I used this approach with the latest router version @angular/routerv3.0.0-alpha8 and it worked perfectly fine.

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