to top using js code example
Example 1: javascript scroll to top of page
//Instant scroll to top of page
window.scrollTo(0, 0);
Example 2: javascript go to top of page
window.scroll({top: 0, left: 0});
//Or with jQuery
$('html,body').scrollTop(0);
//with animation
$('html, body').animate({ scrollTop: 0 }, 'fast');