滚动列表动画

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html

css

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html

css

html {
  position: relative;
  overflow-x: hidden !important;
}

body {
  font-family: 'Roboto', sans-serif;
  font-size: 16px;
  background: #f2f7fd;
}

a, a:hover {
  text-decoration: none;
}

* {
  box-sizing: border-box;
}

.wrapper {
  display: flex;
  align-items: center;
  min-height: 100vh;
  background-image: linear-gradient(-225deg, #231557 0%, #44107A 29%, #FF1361 67%, #fa9b48 100%);
}

.scroll-list {
  width: 100%;
  max-width: 700px;
  padding: 25px;
  margin-top: 50px;
  margin-left: auto;
  margin-right: auto;
}
@media screen and (max-width: 768px) {
  .scroll-list {
    margin-top: 20px;
  }
}
.scroll-list__wrp {
  width: 100%;
  height: 700px;
  overflow: auto;
  padding: 50px;
  box-shadow: 0px 7px 46px 0px rgba(41, 53, 108, 0.45);
  background: #4b1079;
  background: #4b1079;
  margin-bottom: 15px;
  border-radius: 8px;
  background-image: linear-gradient(147deg, #6e0777 0%, #380c70 74%);
}
.scroll-list__wrp .scrollbar-track {
  display: none !important;
}
@media screen and (max-width: 768px) {
  .scroll-list__wrp {
    padding: 25px;
  }
}
.scroll-list__item {
  width: 100%;
  height: 155px;
  display: block;
  margin-bottom: 15px;
  border-radius: 8px;
  background-image: linear-gradient(147deg, #ff7c34 0%, #c31269 74%);
  transition: all .35s ease-in-out;
  opacity: 0;
  transform: scale(0.7);
  box-shadow: 0px 7px 16px 0px rgba(41, 53, 108, 0.25);
}
.scroll-list__item.item-hide {
  opacity: 0;
  transform: scale(0.7);
}
.scroll-list__item.item-focus {
  opacity: 1;
  transform: scale(1);
}
.scroll-list__item.item-next {
  opacity: 1;
  transform: scale(1);
}
.scroll-list__item.item-next + .scroll-list__item {
  opacity: 1;
  transform: scale(1);
}
.scroll-list__item:last-child {
  margin-bottom: 155px;
}

JavaScript

$(document).ready(function () {
  var Scrollbar = window.Scrollbar;

Scrollbar.use(window.OverscrollPlugin);

var customScroll = Scrollbar.init(document.querySelector('.js-scroll-list'), {
    plugins: {
      overscroll: true
    }
  });

var listItem = $('.js-scroll-list-item');

listItem.eq(0).addClass('item-focus');
  listItem.eq(1).addClass('item-next');

customScroll.addListener(function (status) {

var $content = $('.js-scroll-content');

var viewportScrollDistance = 0;

viewportScrollDistance = status.offset.y;
    var viewportHeight = $content.height();
    var listHeight = 0;
    var $listItems = $content.find('.js-scroll-list-item');
    for (var i = 0; i < $listItems.length; i++) {
      listHeight += $($listItems[i]).height();
    }

var top = status.offset.y;
    // console.log(top);
    var visibleCenterVertical = 0;
    visibleCenterVertical = top;

var parentTop = 1;
    var $lis = $('.js-scroll-list-item');
    var $focusLi;
    for (var i = 0; i < $lis.length; i++) {
      var $li = $($lis[i]);
      var liTop = $li.position().top;
      var liRelTop = liTop - parentTop;

var distance = 0;
      var distance = Math.abs(top - liRelTop);
      var maxDistance = $('.js-scroll-content').height() / 2;
      var distancePercent = distance / (maxDistance / 100);

if (liRelTop + $li.parent().scrollTop() > top) {
        if (!$li.hasClass('item-focus')) {
          $li.prev().addClass('item-hide');
          $lis.removeClass('item-focus');
          $lis.removeClass('item-next');
        }
        $li.removeClass('item-hide');
        $li.addClass('item-focus');
        $li.next().addClass('item-next');
        break;
      }
    }
  });

});

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