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I am a huge fan for vanilla javascript, currently I am working on a project where I need to implement smooth scrolling on mouse wheel scroll. I want to implement this using vanilla JS. I found a jQuery snippet on doing some research which go like below.
$(window).on('mousewheel DOMMouseScroll', function(e) {
var dir,
amt = 100;
e.preventDefault();
if(e.type === 'mousewheel') {
dir = e.originalEvent.wheelDelta > 0 ? '-=' : '+=';
}
else {
dir = e.originalEvent.detail < 0 ? '-=' : '+=';
}
$('html, body').stop().animate({
scrollTop: dir + amt
},500, 'linear');
});
Can anyone help me out as in how to implement a smooth scroll without using a helper library like jQuery or any other library.
There are many implementations that people have done in jQuery. But I want a best implementation that one can do in vanilla JS. That can implemented anywhere in React, Angular & Vue anywhere.
291
Mouse scroll wheel jumps can usually be solved by basic troubleshooting techniques like rebooting the computer, cleaning the mouse components, replacing or recharging the mouse batteries, or checking the wireless connection or USB port. The issue can also be resolved by updating corrupt or outdated drivers.
Scrolling to an element can be achieved in Javascript using the scrollIntoView() method. Smooth animation and customizing the alignment can be set through the scrollIntoViewOptions parameter.
How about this:
function init(){
new SmoothScroll(document,120,12)
}
function SmoothScroll(target, speed, smooth) {
if (target === document)
target = (document.scrollingElement
|| document.documentElement
|| document.body.parentNode
|| document.body) // cross browser support for document scrolling
var moving = false
var pos = target.scrollTop
var frame = target === document.body
&& document.documentElement
? document.documentElement
: target // safari is the new IE
target.addEventListener('mousewheel', scrolled, { passive: false })
target.addEventListener('DOMMouseScroll', scrolled, { passive: false })
function scrolled(e) {
e.preventDefault(); // disable default scrolling
var delta = normalizeWheelDelta(e)
pos += -delta * speed
pos = Math.max(0, Math.min(pos, target.scrollHeight - frame.clientHeight)) // limit scrolling
if (!moving) update()
}
function normalizeWheelDelta(e){
if(e.detail){
if(e.wheelDelta)
return e.wheelDelta/e.detail/40 * (e.detail>0 ? 1 : -1) // Opera
else
return -e.detail/3 // Firefox
}else
return e.wheelDelta/120 // IE,Safari,Chrome
}
function update() {
moving = true
var delta = (pos - target.scrollTop) / smooth
target.scrollTop += delta
if (Math.abs(delta) > 0.5)
requestFrame(update)
else
moving = false
}
var requestFrame = function() { // requestAnimationFrame cross browser
return (
window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(func) {
window.setTimeout(func, 1000 / 50);
}
);
}()
}p{
font-size: 16pt;
margin-bottom: 30%;
}<body onload="init()">
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</body>Use it by calling new SmoothScroll(target,speed,smooth)
Arguments:
document Thanks to @Phrogz for the mousewheel normalization.
EDIT: Since Chrome 73 it is required to mark the event listener for the mousewheel event as non-passive in order to be able to call preventDefault() on it. Thanks to @Fred K for this.
140
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