Get Query String from Route URI

Getting a query string from a route URI element is simple (ex: example.com/home?id=7)

1. Import ActivatedRoute (in component.ts):

import { ActivatedRoute } from '@angular/router';

2. Add to component class:

...
id: string | undefined;
constructor(private route: ActivatedRoute) { }

ngOnInit() {
this.route.queryParams
 .subscribe(params => {
	this.id = params['id'];
 }
);
...

3. The query string will now be available to the component as the "id" variable:

<ng-container *ngIf="id">
 ...
  <app-item [itemId]="id"></app-item>
  <span>
    {{ id }}
  </span>
 ...
</ng-container>