jQuery scroll() 检测用户何时停止滚动

Question

没关系。。

$(window).scroll(function()
{
    $('.slides_layover').removeClass('showing_layover');
    $('#slides_effect').show();
});

我可以根据我的理解判断某人何时滚动。因此，我试图弄清楚当有人停下来时如何捕捉。从上面的示例中，您可以看到在滚动发生时我正在从一组元素中删除一个类。但是，我想在用户停止滚动时重新启用该类。

这样做的原因是我打算在页面滚动时进行停留显示，以便为页面提供我正在尝试处理的特殊效果。但是我在滚动时尝试删除的一个类与该效果冲突，因为它对某些性质具有透明效果。

Answer 1

$(window).scroll(function() {
    clearTimeout($.data(this, 'scrollTimer'));
    $.data(this, 'scrollTimer', setTimeout(function() {
        // do something
        console.log("Haven't scrolled in 250ms!");
    }, 250));
});

更新

我写了一个扩展来增强jQuery的默认on-event-handler。它将一个或多个事件的事件处理函数附加到选定元素，如果在给定时间间隔内未触发事件，则调用处理函数。如果您只想在延迟后触发回调，例如调整大小事件等，这将非常有用。

检查 github-repo 的更新很重要！

https://github.com/yckart/jquery.unevent.js

;(function ($) {
    var on = $.fn.on, timer;
    $.fn.on = function () {
        var args = Array.apply(null, arguments);
        var last = args[args.length - 1];

        if (isNaN(last) || (last === 1 && args.pop())) return on.apply(this, args);

        var delay = args.pop();
        var fn = args.pop();

        args.push(function () {
            var self = this, params = arguments;
            clearTimeout(timer);
            timer = setTimeout(function () {
                fn.apply(self, params);
            }, delay);
        });

        return on.apply(this, args);
    };
}(this.jQuery || this.Zepto));

像任何其他 on 或 bind-event 处理程序一样使用它，除了你可以传递一个额外的参数作为最后一个：

$(window).on('scroll', function(e) {
    console.log(e.type + '-event was 250ms not triggered');
}, 250);

http://yckart.github.com/jquery.unevent.js/

（此演示使用resize 而不是scroll，但谁在乎？！）

Answer 2

使用 jQuery 油门/去抖动

jQuery debounce 是解决此类问题的好方法。 jsFidlle

$(window).scroll($.debounce( 250, true, function(){
    $('#scrollMsg').html('SCROLLING!');
}));
$(window).scroll($.debounce( 250, function(){
    $('#scrollMsg').html('DONE!');
}));

第二个参数是“at_begin”标志。这里我展示了如何在“滚动开始”和“滚动结束”处执行代码。

使用 Lodash

正如 Barry P 所建议的那样，jsFiddle、underscore 或 lodash 也有一个去抖动功能，每个 API 都略有不同。

$(window).scroll(_.debounce(function(){
    $('#scrollMsg').html('SCROLLING!');
}, 150, { 'leading': true, 'trailing': false }));

$(window).scroll(_.debounce(function(){
    $('#scrollMsg').html('STOPPED!');
}, 150));

Answer 3

Rob W 建议我查看堆栈上的另一篇文章，该文章与我原来的文章基本相似。通过阅读我找到了一个网站的链接：

http://james.padolsey.com/javascript/special-scroll-events-for-jquery/

在针对我自己的需求进行了一些调整之后，这实际上最终帮助我很好地解决了我的问题，但总的来说，这有助于消除很多麻烦，并为我节省了大约 4 个小时的时间自行解决。

看到这篇文章似乎有一些优点，我想我会回来并提供最初在提到的链接上找到的代码，以防万一作者决定与该网站走不同的方向并最终删除链接。

(function(){

    var special = jQuery.event.special,
        uid1 = 'D' + (+new Date()),
        uid2 = 'D' + (+new Date() + 1);

    special.scrollstart = {
        setup: function() {

            var timer,
                handler =  function(evt) {

                    var _self = this,
                        _args = arguments;

                    if (timer) {
                        clearTimeout(timer);
                    } else {
                        evt.type = 'scrollstart';
                        jQuery.event.handle.apply(_self, _args);
                    }

                    timer = setTimeout( function(){
                        timer = null;
                    }, special.scrollstop.latency);

                };

            jQuery(this).bind('scroll', handler).data(uid1, handler);

        },
        teardown: function(){
            jQuery(this).unbind( 'scroll', jQuery(this).data(uid1) );
        }
    };

    special.scrollstop = {
        latency: 300,
        setup: function() {

            var timer,
                    handler = function(evt) {

                    var _self = this,
                        _args = arguments;

                    if (timer) {
                        clearTimeout(timer);
                    }

                    timer = setTimeout( function(){

                        timer = null;
                        evt.type = 'scrollstop';
                        jQuery.event.handle.apply(_self, _args);

                    }, special.scrollstop.latency);

                };

            jQuery(this).bind('scroll', handler).data(uid2, handler);

        },
        teardown: function() {
            jQuery(this).unbind( 'scroll', jQuery(this).data(uid2) );
        }
    };

})();

Answer 4

我同意上面的一些 cmets 的意见，即监听超时不够准确，因为当您停止移动滚动条足够长的时间而不是停止滚动时会触发超时。我认为一个更好的解决方案是在用户开始滚动时立即监听用户松开鼠标（mouseup）：

$(window).scroll(function(){
    $('#scrollMsg').html('SCROLLING!');
    var stopListener = $(window).mouseup(function(){ // listen to mouse up
        $('#scrollMsg').html('STOPPED SCROLLING!');
        stopListner(); // Stop listening to mouse up after heard for the first time 
    });
});

在this JSFiddle 中可以看到它的工作示例

Answer 5

ES6 样式，也检查滚动开始。

function onScrollHandler(params: {
  onStart: () => void,
  onStop: () => void,
  timeout: number
}) {
  const {onStart, onStop, timeout = 200} = params
  let timer = null

  return (event) => {
    if (timer) {
      clearTimeout(timer)
    } else {
      onStart && onStart(event)
    }
    timer = setTimeout(() => {
      timer = null
      onStop && onStop(event)
    }, timeout)
  }
}

用法：

yourScrollableElement.addEventListener('scroll', onScrollHandler({
  onStart: (event) => {
    console.log('Scrolling has started')
  },
  onStop: (event) => {
    console.log('Scrolling has stopped')
  },
  timeout: 123 // Remove to use default value
}))

Answer 6

您可以设置一个每隔 500 毫秒左右运行的时间间隔，如下所示：

var curOffset, oldOffset;
oldOffset = $(window).scrollTop();
var $el = $('.slides_layover'); // cache jquery ref
setInterval(function() {
  curOffset = $(window).scrollTop();
  if(curOffset != oldOffset) {
    // they're scrolling, remove your class here if it exists
    if($el.hasClass('showing_layover')) $el.removeClass('showing_layover');
  } else {
    // they've stopped, add the class if it doesn't exist
    if(!$el.hasClass('showing_layover')) $el.addClass('showing_layover');
  }
  oldOffset = curOffset;
}, 500);

这段代码我没有测试过，但是原理应该可以的。

Answer 7

function scrolled() {
    //do by scroll start
    $(this).off('scroll')[0].setTimeout(function(){
        //do by scroll end
        $(this).on('scroll',scrolled);
    }, 500)
}
$(window).on('scroll',scrolled);

具有开始和结束能力的非常小的版本

Answer 8

这会使用全局计时器在 1 毫秒（或更改它）后检测滚动停止：

var scrollTimer;

$(window).on("scroll",function(){
    clearTimeout(scrollTimer);
    //Do  what you want whilst scrolling
    scrollTimer=setTimeout(function(){afterScroll()},1);
})

function afterScroll(){
    //I catched scroll stop.
}

Answer 9

好的，这是我以前用过的东西。 基本上你看起来对最后一个scrollTop() 有一个参考。 一旦你的超时清除，你检查当前的scrollTop()，如果它们相同，你就完成了滚动。

$(window).scroll((e) ->
  clearTimeout(scrollTimer)
  $('header').addClass('hidden')

  scrollTimer = setTimeout((() ->
    if $(this).scrollTop() is currentScrollTop
      $('header').removeClass('hidden') 
  ), animationDuration)

  currentScrollTop = $(this).scrollTop()
)

Answer 10

请查看jquery mobile scrollstop event

$(document).on("scrollstop",function(){
  alert("Stopped scrolling!");
});

Answer 11

对于那些仍然需要这个的人，这里是解决方案

  $(function(){
      var t;
      document.addEventListener('scroll',function(e){
          clearTimeout(t);
          checkScroll();
      });
      
      function checkScroll(){
          t = setTimeout(function(){
             alert('Done Scrolling');
          },500); /* You can increase or reduse timer */
      }
  });

Answer 12

这应该可行：

var Timer;
$('.Scroll_Table_Div').on("scroll",function() 
{
    // do somethings

    clearTimeout(Timer);
    Timer = setTimeout(function()
    {
        console.log('scrolling is stop');
    },50);
});

Answer 13

你可以这样处理：

    var scrollStop = function (callback) {
        if (!callback || typeof callback !== 'function') return;
        var isScrolling;
        window.addEventListener('scroll', function (event) {
            window.clearTimeout(isScrolling);
            isScrolling = setTimeout(function() {
                callback();
            }, 66);
        }, false);
    };
    scrollStop(function () {
        console.log('Scrolling has stopped.');
    });

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    <title>Title</title>
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