angular 7 redirecting to another page

Question

I have a login page and a dashboard component.My problem is when i login from the page the dashboard displays below the login page, it is not redirecting as a new page.How to achieve this in angular 7? Any help would be helpful'. Thanks!!

app.component.ts

import { Component } from '@angular/core';
import { Router } from '@angular/router';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})

export class AppComponent {
  title = 'Shopping-cart';
  user = []
  users = []
  public Candidate = []
  public showWhen:boolean = false;

  constructor(private _router: Router){}

  authenticateLogin(user){
    let authUser = JSON.parse(localStorage.getItem('auth'))
    console.log(user);
    if(user.mail === authUser[0] && user.password === authUser[1]){
      this.showWhen = true;
      console.log("Logged in Successfully");
      this._router.navigate(['dashboard']);
    } else {
      console.error("Invalid email and password");
    }
  }

}

This is my routing-module

app-routing.module.ts

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { DashboardComponent } from './dashboard/dashboard.component';

const routes: Routes = [
  { path: 'dashboard', component: DashboardComponent} 
];

@NgModule({
  imports: [RouterModule.forRoot(routes, { enableTracing: true })],
  exports: [RouterModule]
})
export class AppRoutingModule { }

Answer 1

In Routes you have only one route - to dashboard - make second route to login