Angular highlighting based on routerLinkActive

Question

i want to toggle highlighting for the routerLinkActive based on the routes, i have a dashboard component and both the dashboard menu item and labels menu item refer to the same component, i want to add class to the li items based on the route for dashboard the route will be

http://localhost:4300/dashboard

and for the labels , the route will be

http://localhost:4300/dashboard/5d1bb53877ed8702d8a01940

Code for the menu item

 <ul class="sidebar-nav">
                <li [ngClass]="{ active: rlal && rlal.isActive == false }">
                  <a [routerLink]="['/dashboard']" (click)="loadSnippet(null)">
                    <mat-icon>dashboard</mat-icon>
                    <span>Dashboard</span>
                  </a>
                </li>

     <h3 *ngIf="labelList && labelList.length!=0">Labels</h3>
              <ul class="sidebar-nav">
                <li *ngFor="let label of labelList" [ngClass]="rlal && rlal.isActive ? 'active' : ''"
                  routerLinkActive="rlal.isActive">
                  <a [routerLink]="['/dashboard', label._id]" routerLinkActive #rlal="routerLinkActive"
                    (click)="loadSnippet(label)">
                    <mat-icon>label</mat-icon>
                    <span>{{ label.label_name }} </span>
                  </a>
                </li>
              </ul>

Routes:

 {
    path: "dashboard",
    component: DashboardComponent,
    canActivate: [LoggedInGuard]
  },
  {
    path: "dashboard/:labelId",
    component: DashboardComponent,
    canActivate: [LoggedInGuard]
  }

The highlighting works fine for the individual label items, but for the dashboard , the li is not getting highlighted

Answer 1

If you want the dashboard link to be active only if there's no route parameter, you need to add routerLinkActive and [routerLinkActiveOptions]="{exact: true}" to you dashboard li node.

Also, you don't need to set the active class via ngClass , because routerLinkActive will do that for you.

<li routerLinkActive="active" [routerLinkActiveOptions]="{exact: true}">
  <a routerLink="/dashboard" (click)="loadSnippet(null)">
    <mat-icon>dashboard</mat-icon>
    <span>Dashboard</span>
  </a>
</li>

 ...

<li routerLinkActive="active" *ngFor="let label of labelList">
  <a [routerLink]="['/dashboard', label._id]" (click)="loadSnippet(label)">
    <mat-icon>label</mat-icon>
    <span>{{ label.label_name }}</span>
  </a>
</li>