angular optional parameter route code example

Example 1: angular router with wuery param

goProducts() {
  this.router.navigate(['/products'], { queryParams: { order: 'popular' } });
}

http://localhost:4200/products?order=popular

 constructor(private route: ActivatedRoute) { }

  ngOnInit() {
    this.route.queryParams
      .filter(params => params.order)
      .subscribe(params => {
        console.log(params); // { order: "popular" }

        this.order = params.order;
        console.log(this.order); // popular
      }
    );
  }

Example 2: angular routing url params

const appRoutes: Routes = [
  { path: 'crisis-center/:param1', component: CrisisListComponent },
  { path: 'hero/:param2',      component: HeroDetailComponent },
];

@NgModule({
  imports: [
    RouterModule.forRoot(
      appRoutes,
      { enableTracing: true } // <-- debugging purposes only
    )
    // other imports here
  ],
  ...
})
export class AppModule { }