バニラジャバスクリプトのマウスホイールでのスムーズな垂直スクロール？
私はバニラjavascriptの大ファンです。現在、マウスホイールスクロールでスムーズスクロールを実装する必要があるプロジェクトに取り組んでいます。 Vanilla JSを使用してこれを実装したいと思います。以下のような調査を行う上でjQueryスニペットを見つけました。
$(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');
});
JQueryや他のライブラリなどのヘルパーライブラリを使用せずにスムーズスクロールを実装する方法について、誰でも私を助けることができます。
人々がjQueryで行った多くの実装があります。しかし、Vanilla JSでできる最善の実装が必要です。 Reactのどこにでも実装できます。Angular＆Vueどこでも。
これはどう：
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()">
<h1>Lorem Ipsum</h1>
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<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
<p>Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ipsum dolor sit amet.</p>
</body>new SmoothScroll(target,speed,smooth)を呼び出して使用します
引数：
- target：スムーズにスクロールされる要素-divまたは
document - 速度：マウスホイールのステップごとにスクロールされるピクセルの量
- smooth：平滑化係数、値が高いほど滑らかになります。
マウスホイールの正規化 の@Phrogzに感謝します。
編集：Chrome 73以来、その上でpreventDefault()を呼び出すことができるように、mousewheelイベントのイベントリスナーを非パッシブとしてマークする必要があります。@ Fredに感謝します。これのためのK。
パブリッシュしたコードは、ほぼVanilla jsです。ちょっとした調整
時間があれば The wheel event をご覧ください
ここで新しいものはアニメーション関数になります
// Code goes here
document.addEventListener('wheel',function (event){
//only vertical scroll
if (event.deltaY > 0)
{
event.preventDefault();
smoothScroll(document.documentElement,100,1000)
}
})
function smoothScroll (domElement,pixel,delay)
{
const intervalToRepeat = 25;
const step = (intervalToRepeat * pixel) / delay;
if ( step < pixel)
{
domElement.scrollTop += step;
setTimeout(function (){
smoothScroll(domElement,pixel - step,delay)
},intervalToRepeat);
}
}
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="style.css">
<script src="script.js"></script>
</head>
<body>
<h1>Hello Plunker!</h1>
<div style="width:400px;height:200px;" >
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<br>
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</div>
</body>
</html>純粋なJavaScript onscrollイベントが機能します：
var container = document.getElementById('myScrollingSurface');
var lastY = 0;
container.onscroll = function () {
doSomethingCool(container.scrollTop - lastY);
lastY = container.scrollTop;
};
これはスクロールバー用のクールで軽量なvanillaJSライブラリです。 シンプルなスクロールバー
実際のスクロールバーを表示してもしなくても使用できます。