在香草javascript鼠标滚轮上平滑垂直滚动？

问题描述 投票：6回答：4

我是vanilla javascript的忠实粉丝，目前我正在开发一个项目，我需要在鼠标滚轮上实现平滑滚动。我想用vanilla JS来实现它。我发现了一个关于做一些研究的jQuery片段，如下所示。

$(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');
});

任何人都可以帮助我，如何在不使用jQuery或任何其他库的帮助程序库的情况下实现平滑滚动。

人们在jQuery中有很多实现。但我想要一个可以用vanilla JS做的最佳实现。这可以在React，Angular和Vue的任何地方实现。

javascript mouseevent mouselistener mousewheel
4个回答
25
投票

这个怎么样：

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>
  
  <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>
  
  <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>

通过调用new SmoothScroll(target,speed,smooth)使用它

参数：

  1. target：要平滑滚动的元素 - 可以是div或document
  2. 速度：每个鼠标滚轮步进滚动的像素数量
  3. 平滑：平滑因子，值越高，越平滑。

感谢@Phrogz为mousewheel normalization。

编辑：自Chrome 73以来，需要将mousewheel事件的事件监听器标记为非被动，以便能够在其上调用preventDefault()。感谢@Fred K。

1
投票

您发布的代码几乎是vanilla js。只是一些ajustement

如果你有时间看看The wheel event

这里新的东西将是动画功能

// 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;" >
      lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some 
      lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some 
      lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some 
      lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some 
      <br>
      lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some 
      lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some 
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      <br>
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      lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some <br>
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      lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some <br>
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      lorem ipsum some lorem ipsum some lorem ipsum some lorem ipsum some 
      
    </div>
  </body>

</html>
1
投票

一个纯JavaScript onscroll事件将起作用：

var container = document.getElementById('myScrollingSurface');
var lastY = 0;
container.onscroll = function () {
  doSomethingCool(container.scrollTop - lastY);
  lastY = container.scrollTop;
};
0
投票

这是一个很酷的轻量级vanillaJS库，用于滚动条。 Simple-scrollbar

你可以使用或不显示实际的滚动条。

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