import { Injectable } from '@angular/core';
import { CanDeactivate, Router} from '@angular/router';
import {Observable}       from 'rxjs/Observable';

@Injectable() // do not forget to register this class as a provider
export class PreviousRouteRecorder implements CanDeactivate<any> {
  constructor(private router: Router) {
  }
  canDeactivate(component: any): Observable<boolean> | boolean {
    if (typeof localStorage !== 'undefined') {
      console.log("In PreviousRouteRecorder : "+this.router.url );
      localStorage.setItem('previousRoute', this.router.url);
    }
    return true;
  }
}