Check internet connection in web using Angular 4

I am using Angular 4 for my application development. I need to check If the network connection is available for its have any Connection issue using Angular for. Is it possible with Angular 4.

I checked with http://ift.tt/18SMZ0f . I think this will not work for angular 4. Any one please suggest. Is this possible to use offlinejs for Angular 4 or any other alternatives?

Thanks Sarath C M