Enable smooth scrolling for my website in all browsers
Solution 1
I found two jQuery plugins that may do what you want.
Simplr-SmoothScroll // Source: SE Question
edit: Struck out SmoothWheel because of comments - it hasn't been updated in ages, and SmoothScroll seems well maintained.
Solution 2
If you are Cargo cult programmer, go with jQuery. Proceed only if you are Real programmer.
Screw jQuery.animate(), understand the math behind and pick an algorithm. Robert Penner has a nice demo, I picked EaseOutQuad.
Read how to handle mouse wheel cross-browser style here, then do some more reading.
In this code, I choose not to support IE 8 and older. The idea is to hook up the wheel event, prevent it (since the default behavior is jerky jump) and perform own smooth jump
Math.easeOutQuad = function (t, b, c, d) { t /= d; return -c * t*(t-2) + b; };
(function() { // do not mess global space
var
interval, // scroll is being eased
mult = 0, // how fast do we scroll
dir = 0, // 1 = scroll down, -1 = scroll up
steps = 50, // how many steps in animation
length = 30; // how long to animate
function MouseWheelHandler(e) {
e.preventDefault(); // prevent default browser scroll
clearInterval(interval); // cancel previous animation
++mult; // we are going to scroll faster
var delta = -Math.max(-1, Math.min(1, (e.wheelDelta || -e.detail))); // cross-browser
if(dir!=delta) { // scroll direction changed
mult = 1; // start slowly
dir = delta;
}
// in this cycle, we determine which element to scroll
for(var tgt=e.target; tgt!=document.documentElement; tgt=tgt.parentNode) {
var oldScroll = tgt.scrollTop;
tgt.scrollTop+= delta;
if(oldScroll!=tgt.scrollTop) break;
// else the element can't be scrolled, try its parent in next iteration
}
var start = tgt.scrollTop;
var end = start + length*mult*delta; // where to end the scroll
var change = end - start; // base change in one step
var step = 0; // current step
interval = setInterval(function() {
var pos = Math.easeOutQuad(step++,start,change,steps); // calculate next step
tgt.scrollTop = pos; // scroll the target to next step
if(step>=steps) { // scroll finished without speed up - stop animation
mult = 0; // next scroll will start slowly
clearInterval(interval);
}
},10);
}
// nonstandard: Chrome, IE, Opera, Safari
window.addEventListener("mousewheel", MouseWheelHandler, false);
// nonstandard: Firefox
window.addEventListener("DOMMouseScroll", MouseWheelHandler, false);
})();
As you can see in this demo, I prefer as little easing as possible, just to avoid jerky scrolling. Read the comments above and design your own scrolling which suits your project.
Note: mousewheel also hooks to touchpad, but not to up/down keys. You should consider to hook key events, too.
Solution 3
I had not a lot of time, but I tried to write a (cross browser & dirty) smooth scrolling functionality on the fly. When you stop scrolling it smoothly decelerates. You can rewrite it a little bit so it fits your needs.
Give it a try here:
Smooth scrolling:
function getScrollTop(){
if(typeof pageYOffset!= 'undefined'){
//most browsers except IE before #9
return pageYOffset;
} else {
var B = document.body; //IE 'quirks'
var D = document.documentElement; //IE with doctype
D = (D.clientHeight) ? D : B;
return D.scrollTop;
}
}
var timeouts = [];
var scrolling = false;
var scroller;
var scrollTop = getScrollTop();
var timeMs;
var alter = false;
var speed = 5;
window.onscroll = function() {
if(alter) {
var timeDif = new Date().getMilliseconds() - timeMs;
speed = 5 - (timeDif / 50);
console.log(speed);
}
timeMs = new Date().getMilliseconds();
alter = !alter;
var scrollDirection = getScrollTop() - scrollTop;
scrollDirection = scrollDirection / Math.abs(scrollDirection);
scrollTop = getScrollTop();
clearTimeout(scroller);
scroller = setTimeout(function(){
console.log('smooth scrolling active');
if(!scrolling) {
timeouts.length = 0;
scrolling = true;
var steps = 50;
var delay = 6;
for(var i = 0; i < steps; i++) {
(function(i){
var timeout = setTimeout(function(){
var perc = i / steps;
var val = (perc == 1) ? 1 : (-Math.pow(2, -10 * perc) + 1);
var scrollY = val * speed * scrollDirection;
window.scrollTo(0, getScrollTop() + scrollY);
setTimeout(function(){
if(i == (steps - 1)) scrolling = false;
}, steps * delay);
}, (i * delay));
timeouts.push(timeout);
})(i);
}
}
}, 50);
};
Solution 4
Simplr-SmoothScroll have one bug - it is not working with body, when body height is not auto.
I found another plugin and it is became perfect solution for me. https://github.com/inuyaksa/jquery.nicescroll
download library (demo) and add to the begining
// 1. Simple mode, it styles document scrollbar:
$(document).ready(function() {
$("body").niceScroll();
});
Solution 5
for chrome only try this - https://github.com/im4aLL/chromeSmoothScroll only 1 KB
Ian
Full stack web app & REST API developer at Galatea Associates working on financial software and open source projects. Experienced in TypeScript, Python, and Scala.
Updated on November 15, 2021Comments
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Ian over 2 years
I'm developing a parallax scrolling website using the Stellar and Skrollr libraries. The website behaves perfectly in Firefox because of Firefox's smooth scrolling feature, but in Chrome, scrolling with the mouse wheel is jerky, and the parallax effect is almost ruined. Is there any way to get the smooth scrolling with the mouse wheel in all browsers while maintaining performance?
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Ian over 10 yearsI know that can cause jerky scrolling, but what I'm looking for is a way to smooth scrolling with the mouse wheel in general. For example, on a simple text page, scrolling one turn goes about 3 lines down by default, all in one jump. I want it to go the same distance but smoothly.
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Kishorevarma over 10 yearsyeah I got it now, I have added a sample code here in js fiddle. which works fine for chrome. if you don't have any problem with firefox you an remove that related if condition. [link] (jsfiddle.net/Y6xZM/1) and you can use MOUSE_WHEEL_GAIN to increase scroll amount.
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spitfire about 9 yearsI found this script best of them all for my parallax site. Benefits include: browser specific(I only targeted Chrome), keyboard functionality built in, and no additional libraries needed (Simplr-SmoothScroll required JQuery mousewheel). I did find that adjusting the speed to 200 from default 800 gave the closest to FireFox effect. Also noticed that the speed of mouse wheel scrolling was accounted for. Big spin gave big scroll. Other scripts specified scroll distance no matter what the mouse wheel action was (large or short scroll).
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vivekkupadhyay over 8 years
Simplr-SmoothScroll
is very good but when you usetrack-pad
ofmac
or anylaptop
it behaves abruptly and will scroll whole window with a single swipe. -
IqbalBary over 8 yearsThere is a big problem of
Simplr-SmoothScroll
When you usetrack-pad
so please check that issue before using. -
Jessica over 7 yearsThis is awesome code with explanation! How would I add smooth scrolling when the user scroll with the actual scroll bar? (I.e. not with the mouse wheel, but actually clicks and drags the scroll bar)
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Jessica over 7 yearsAlso, say the user scrolled all the way to the top (or bottom). How can you automatically scroll a bit farther down, then bounce back? Sort of like elastic scrolling
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Jan Turoň over 7 years@Jessica then I suggest to pick the out back cubic algorithm from here, just make sure to leave enough empty space at the bottom of the page. In the future I believe every browser will support a nice scroll feel, so this script will become obsolete. See the Chrome announcement. Tough luck with scrollbar scrolling :-/ It's a browser feature, there is no "onscrollbarscroll" event.
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Jessica over 7 years@JanTuroň Thanks! Hopefully the browsers will implement that! Anyway, I tried it out, jsfiddle.net/jgeqda91 and it bounces at every scroll, and doesn't bounce at the top and bottom. I only want it to bounce when it hits all the way to the top or bottom. How can I implement that? (Or should I just ask a new question?)
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Jan Turoň over 7 years@Jessica I guess you need to add a condition if the end position is at (or very close) top or bottom excluding the padding left for bounce, the use out back cubic, else use only out cubic. Would you try?
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Mavichow about 7 yearsthanks!we use this plugin as well due to trackpad issue, working fine on our side too.