How to get param from url in angular 4?

Routes

export const MyRoutes: Routes = [
    { path: '/items/:id', component: MyComponent }
]

Component

import { ActivatedRoute } from '@angular/router';
public id: string;

constructor(private route: ActivatedRoute) {}

ngOnInit() {
   this.id = this.route.snapshot.paramMap.get('id');
}

Update

I belive Dimitry Grinko's answer in this post is better than this one.

Old answer

This should do the trick retrieving the params from the url:

constructor(private activatedRoute: ActivatedRoute) {
  this.activatedRoute.queryParams.subscribe(params => {
        let date = params['startdate'];
        console.log(date); // Print the parameter to the console. 
    });
}

The local variable date should now contain the startdate parameter from the URL. The modules Router and Params can be removed (if not used somewhere else in the class).