parameter in url code example

Example 1: get parameters from url

var url_string = "http://www.example.com/t.html?a=1&b=3&c=m2-m3-m4-m5"; //window.location.href
var url = new URL(url_string);
var c = url.searchParams.get("c");
console.log(c);

Example 2: get parameters from url

www.test.com/t.html?a=1&b=3&c=m2-m3-m4-m5

Example 3: url param

// ...
import { ActivatedRoute } from '@angular/router';
import 'rxjs/add/operator/filter';

@Component({ ... })
export class BookComponent implements OnInit {
  
  category: string;
  
  constructor(private route: ActivatedRoute) { }

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