In most cases, it would be best to use a plugin. Seriously. I'm going to tout mine here. Of course there are others, too. But please check if they really avoid the pitfalls for which you'd want a plugin in the first place - not all of them do.
I have written about the reasons for using a plugin elsewhere. In a nutshell, the one liner underpinning most answers here
$('html, body').animate( { scrollTop: $target.offset().top }, duration );
is bad UX.
The animation doesn't respond to user actions. It carries on even if the user clicks, taps, or tries to scroll.
If the starting point of the animation is close to the target element, the animation is painfully slow.
If the target element is placed near the bottom of the page, it can't be scrolled to the top of the window. The scroll animation stops abruptly then, in mid motion.
To handle these issues (and a bunch of others), you can use a plugin of mine, jQuery.scrollable. The call then becomes
$( window ).scrollTo( targetPosition );
and that's it. Of course, there are more options.
With regard to the target position, $target.offset().top
does the job in most cases. But please be aware that the returned value doesn't take a border on the html
element into account (see this demo). If you need the target position to be accurate under any circumstances, it is better to use
targetPosition = $( window ).scrollTop() + $target[0].getBoundingClientRect().top;
That works even if a border on the html
element is set.
scrollTo
was disabled for me because of a chrome plugin, not sure which. – Jacksonkr