如何确定jQuery滚动事件的方向？

使用此功能来查找滚动方向。仅用于查找垂直滚动的方向。支持所有跨浏览器。

    var scrollableElement = document.getElementById('scrollableElement');

    scrollableElement.addEventListener('wheel', findScrollDirectionOtherBrowsers);

    function findScrollDirectionOtherBrowsers(event){
        var delta;

        if (event.wheelDelta){
            delta = event.wheelDelta;
        }else{
            delta = -1 * event.deltaY;
        }

        if (delta < 0){
            console.log("DOWN");
        }else if (delta > 0){
            console.log("UP");
        }

    }

Example

var tempScrollTop, currentScrollTop = 0; 

$(window).scroll(function(){ 

   currentScrollTop = $("#div").scrollTop(); 

   if (tempScrollTop > currentScrollTop ) {
       // upscroll code
   }
  else if (tempScrollTop < currentScrollTop ){
      // downscroll code
  }

  tempScrollTop = currentScrollTop; 
} 

或者使用鼠标滚轮扩展，请参见这里。

我已经看到很多关于此问题的好答案，但似乎有些人会遇到跨浏览器的问题，这是我的解决方法。

我已经成功地在FF、IE和Chrome中使用这个方法来检测方向...由于我通常使用Windows操作系统，所以我没有在Safari中进行测试。

$("html, body").bind({'mousewheel DOMMouseScroll onmousewheel touchmove scroll': 
    function(e) {
        if (e.target.id == 'el') return;
        e.preventDefault();
        e.stopPropagation();

        //Determine Direction
        if (e.originalEvent.wheelDelta && e.originalEvent.wheelDelta >= 0) {
            //Up
            alert("up");

        } else if (e.originalEvent.detail && e.originalEvent.detail <= 0) {
            //Up
            alert("up");

        } else {
            //Down
            alert("down");
        }
    }
});

请注意，我也使用这个方法来停止任何滚动，如果您希望仍然发生滚动，则必须删除e.preventDefault(); e.stopPropagation();

$(window).on('mousewheel DOMMouseScroll', function (e) {
    var delta = e.originalEvent.wheelDelta ? 
                   e.originalEvent.wheelDelta : -e.originalEvent.detail;

    if (delta >= 0) {
        console.log('scroll up');
    } else {
        console.log('scroll down');
    }
});

请保持简单：

jQuery事件监听器方法：

$(window).on('wheel', function(){
  whichDirection(event);
});

原生JavaScript事件监听方式：

if(window.addEventListener){
  addEventListener('wheel', whichDirection, false);
} else if (window.attachEvent) {
  attachEvent('wheel', whichDirection, false);
}

功能保持不变：

function whichDirection(event){
  console.log(event + ' WheelEvent has all kinds of good stuff to work with');
  var scrollDirection = event.deltaY;
  if(scrollDirection === 1){
    console.log('meet me at the club, going down', scrollDirection);
  } else if(scrollDirection === -1) {
    console.log('Going up, on a tuesday', scrollDirection);
  }
}

您可以同时使用滚动条和鼠标滚轮选项来跟踪上下移动。

 $('body').bind('scroll mousewheel', function(event) {

if (event.originalEvent.wheelDelta >= 0) {
      console.log('moving down');   
    }
    else {
      console.log('moving up'); 
    }
});

您可以将“body”替换为（window）。

You can use this as well

$(document).ready(function(){

  var currentscroll_position = $(window).scrollTop();
$(window).on('scroll', function(){
Get_page_scroll_direction();
});

function Get_page_scroll_direction(){
  var running_scroll_position = $(window).scrollTop();
  if(running_scroll_position > currentscroll_position) {
      
      $('.direction_value').text('Scrolling Down Scripts');

  } else {
       
       $('.direction_value').text('Scrolling Up Scripts');

  }
  currentscroll_position = running_scroll_position;
}

});

.direction_value{
  position: fixed;
  height: 30px;
  background-color: #333;
  color: #fff;
  text-align: center;
  z-index: 99;
  left: 0;
  top: 0;
  width: 100%;
}

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

<div class="direction_value">
</div>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ducimus expedita facilis architecto fugiat veniam natus suscipit amet beatae atque, enim recusandae quos, magnam, perferendis accusamus cumque nemo modi unde!</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ducimus expedita facilis architecto fugiat veniam natus suscipit amet beatae atque, enim recusandae quos, magnam, perferendis accusamus cumque nemo modi unde!</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ducimus expedita facilis architecto fugiat veniam natus suscipit amet beatae atque, enim recusandae quos, magnam, perferendis accusamus cumque nemo modi unde!</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ducimus expedita facilis architecto fugiat veniam natus suscipit amet beatae atque, enim recusandae quos, magnam, perferendis accusamus cumque nemo modi unde!</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ducimus expedita facilis architecto fugiat veniam natus suscipit amet beatae atque, enim recusandae quos, magnam, perferendis accusamus cumque nemo modi unde!</p>
<p>Lorem ipsum dolor sit amet, consectetur adipisicing elit. Nisi ducimus expedita facilis architecto fugiat veniam natus suscipit amet beatae atque, enim recusandae quos, magnam, perferendis accusamus cumque nemo modi unde!</p>

当你在滚动元素时，在.data()中增加一个存储器，这样你就可以测试滚动次数是否到达了顶部。

$window.on('scroll', function (event) {
    console.group('Scroll');
    console.info('Scroll event:', event);
    console.info('Position:', this.pageYOffset);
    console.info('Direction:', event.originalEvent.dir); // Here is the direction
    console.groupEnd();
});

这是一种最佳解决方案，可以在用户结束滚动时检测方向。

var currentScrollTop = 0 ;

$(window).bind('scroll', function () {     

    scrollTop = $(this).scrollTop();

    clearTimeout($.data(this, 'scrollTimer'));
    $.data(this, 'scrollTimer', setTimeout(function() {

        if(scrollTop > currentScrollTop){
            // downscroll code
            $('.mfb-component--bl').addClass('mfbHide');
        }else{
            // upscroll code
            $('.mfb-component--bl').removeClass('mfbHide');
        }
        currentScrollTop = scrollTop;

    }, 250));

});