url param

1
2// ...
3import { ActivatedRoute } from '@angular/router';
4import 'rxjs/add/operator/filter';
5
6@Component({ ... })
7export class BookComponent implements OnInit {
8  
9  category: string;
10  
11  constructor(private route: ActivatedRoute) { }
12
13  ngOnInit() {
14    this.route.queryParams
15      .filter(params => params.category)
16      .subscribe(params => {
17        console.log(params); // { category: "fiction" }
18        this.category = params.category;
19        console.log(this.category); // fiction
20      }
21    );
22  }
23}
24
25