scrollTo top

<p (click)="onDo($event)" style="cursor:pointer"> <label style="cursor:pointer">back to top</label>&nbsp;&nbsp;<i class="fa fa-arrow-circle-up" aria-hidden="true"></i> </p>

onDo(){

 let scrollToTop = window.setInterval(() => {     let pos = window.pageYOffset;     if (pos > 0) {         window.scrollTo(0, pos - 20);      } else {         window.clearInterval(scrollToTop);     } }, 16);}

}

or

<input type="submit" (click)="onDo($event)" style="cursor:pointer" value="GoToTop">

 onDo(v:any){

    let scrollToTop = window.setInterval(() => {  

         let pos = window.pageYOffset;  

           if (pos > 0) {        

            window.scrollTo(0, pos - 20);      

          } else {    

                window.clearInterval(scrollToTop);  

                 } }, 16);}