JAVASCRIPT

get route query params angular

export class HeroComponent implements OnInit {
  constructor(private _activatedRoute: ActivatedRoute, private _router:Router) {
    _router.routerState.queryParams.subscribe(
      params => console.log('queryParams', params['st']));

detect query param route change angular

constructor(route:ActivatedRoute) {
    route.queryParams.subscribe(p => console.log(p.myQueryParam)); // you can also do this in ngOnInit
}