Detecting real time window size changes in Angular 4

Question

I have been trying to build a responsive nav-bar and do not wish to use a media query, so I intend to use *ngIF with the window size as a criterion. But I have

Answer 1

If you'd like you components to remain easily testable you should wrap the global window object in an Angular Service:

import { Injectable } from '@angular/core';

@Injectable()
export class WindowService {

  get windowRef() {
    return window;
  }

}

You can then inject it like any other service:

constructor(
    private windowService: WindowService
) { }

And consume...

  ngOnInit() {
      const width= this.windowService.windowRef.innerWidth;
  }