Http Loader

export class AppComponent {
    isLoading = true;

    ngOnInit()
    {
        this._postService.getPosts()
            .subscribe(posts => { 
                this.posts = posts;
                this.isLoading = false;
            });
    }
}

In the view

<i *ngIf='isLoading' class='fa fa-­spinner fa-­spin fa‐3x'></i>