更改此轮播中的项目数答案

【问题标题】：Change Number of Items in this Carousel更改此轮播中的项目数
【发布时间】：2021-02-26 14:08:25
【问题描述】：

我找到了这个轮播并想使用它。问题是原始轮播有很多幻灯片（大约 8 张），而我只想要 3 张。看起来这很简单，但我无法让它与 3 张幻灯片正常工作。相反，它完成了三张幻灯片，然后等待我删除的额外幻灯片在重复之前滚动浏览所花费的时间。

我尝试了很多东西。从.vertical_carousel__item:nth-child() 中删除一个元素什么都不做。执行此操作然后调整 animation: carousel-animate-vertical 27s linear infinite 只会导致轮播卡顿而不是平稳移动，更改 animation-delay: calc(3s * -1) 也会导致幻灯片重叠。

我尝试了很多组合，但无法让它顺利运行并在我的三张幻灯片之后循环播放，而无需等待 15 秒才能再次循环播放。

任何帮助将不胜感激。

<div class="vertical_carousel_div">
      <div class="vertical_carousel">

      <div class="vertical_carousel__item">
      <div class="vertical_carousel__item-head">
      </div>
      <div class="vertical_carousel__item-body">
      <p class="vertical_carousel_title">1</p>
      </div>
      </div>

      <div class="vertical_carousel__item">
      <div class="vertical_carousel__item-head">
      </div>
      <div class="vertical_carousel__item-body">
      <p class="vertical_carousel_title">2</p>
      </div>
      </div>

      <div class="vertical_carousel__item">
      <div class="vertical_carousel__item-head">
      </div>
      <div class="vertical_carousel__item-body">
      <p class="vertical_carousel_title">3</p>
      </div>
      </div>

      </div>
</div>


.vertical_carousel__item {
  display: flex;
  align-items: center;
  position: absolute;
  width: 100%;
  padding: 0 12px;
  opacity: 0;
  filter: drop-shadow(0 2px 2px #555);
  will-change: transform, opacity;
  animation: carousel-animate-vertical 27s linear infinite;
}

.vertical_carousel__item:nth-child(1) {
  animation-delay: calc(3s * -1);
}

.vertical_carousel__item:nth-child(2) {
  animation-delay: calc(3s * 0);
}

.vertical_carousel__item:nth-child(3) {
  animation-delay: calc(3s * 1);
}

.vertical_carousel__item:nth-child(4) {
  animation-delay: calc(3s * 2);
}

.vertical_carousel__item:nth-child(5) {
  animation-delay: calc(3s * 3);
}

.vertical_carousel__item:nth-child(6) {
  animation-delay: calc(3s * 4);
}

.vertical_carousel__item:nth-child(7) {
  animation-delay: calc(3s * 5);
}

.vertical_carousel__item:nth-child(8) {
  animation-delay: calc(3s * 6);
}

.vertical_carousel__item:last-child {
  animation-delay: calc(-3s * 2);
}

谢谢。

【问题讨论】：

请尝试创建演示或显示8轮播演示的链接/
当然。 codepen.io/aija/pen/xvXWoK
你想要 3 个元素的 Codepen 代码对吗？
没错。我认为这会相对简单，因为我之前做过类似的修改。但是这个让我很难过。

标签： css bootstrap-4 carousel

【解决方案1】：

你可以

将 HTML 元素的数量删除为 3。
将animation-duration中的时间从27s调整为9s。
您需要根据元素调整关键帧步数。

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  font-family: 'Work Sans', sans-serif;
  font-weight: 400;
  height: 100vh;
}

.wrapper {
  background: linear-gradient(60deg, #420285, #08BDBD);
  height: 100%;
  width: 100%;
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: center;
  justify-content: center;
}

.carousel {
  position: relative;
  width: 100%;
  max-width: 500px;
  display: -webkit-box;
  display: flex;
  -webkit-box-pack: center;
  justify-content: center;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
  flex-direction: column;
}

.carousel__item {
  display: -webkit-box;
  display: flex;
  -webkit-box-align: center;
  align-items: center;
  position: absolute;
  width: 100%;
  padding: 0 12px;
  opacity: 0;
  -webkit-filter: drop-shadow(0 2px 2px #555);
  filter: drop-shadow(0 2px 2px #555);
  will-change: transform, opacity;
  -webkit-animation: carousel-animate-vertical 9s linear infinite;
  animation: carousel-animate-vertical 9s linear infinite;
}

.carousel__item:nth-child(1) {
  -webkit-animation-delay: calc(3s * -1);
  animation-delay: calc(3s * -1);
}

.carousel__item:nth-child(2) {
  -webkit-animation-delay: calc(3s * 0);
  animation-delay: calc(3s * 0);
}

.carousel__item:last-child {
  -webkit-animation-delay: calc(-3s * 2);
  animation-delay: calc(-3s * 2);
}

.carousel__item-head {
  border-radius: 50%;
  background-color: #d7f7fc;
  width: 90px;
  height: 90px;
  padding: 14px;
  position: relative;
  margin-right: -45px;
  flex-shrink: 0;
  display: -webkit-box;
  display: flex;
  -webkit-box-align: center;
  align-items: center;
  -webkit-box-pack: center;
  justify-content: center;
  font-size: 50px;
}

.carousel__item-body {
  width: 100%;
  background-color: #fff;
  border-radius: 8px;
  padding: 16px 20px 16px 70px;
}

.title {
  text-transform: uppercase;
  font-size: 20px;
  margin-top: 10px;
}

@keyframes carousel-animate-vertical {
  0% {
    transform: translateY(100%) scale(0.5);
    opacity: 0;
    visibility: hidden;
  }
  9%,
  33.3333333333% {
    transform: translateY(100%) scale(0.7);
    opacity: .4;
    visibility: visible;
  }
  42.3333333333%,
  66.6666666667% {
    transform: translateY(0) scale(1);
    opacity: 1;
    visibility: visible;
  }
  75.6666666667% {
    transform: translateY(-100%) scale(0.7);
    opacity: .4;
    visibility: visible;
  }
  100% {
    transform: translateY(-100%) scale(0.7);
    opacity: .075;
    visibility: hidden;
  }
}

<div class='wrapper'>
  <div class='carousel'>
    <div class='carousel__item'>
      <div class='carousel__item-head'>
        ?
      </div>
      <div class='carousel__item-body'>
        <p class='title'>spouting whale</p>
        <p>Unicode: U+1F433</p>
      </div>
    </div>
    <div class='carousel__item'>
      <div class='carousel__item-head'>
        ?
      </div>
      <div class='carousel__item-body'>
        <p class='title'>whale</p>
        <p>Unicode: U+1F40B</p>
      </div>
    </div>
    <div class='carousel__item'>
      <div class='carousel__item-head'>
        ?
      </div>
      <div class='carousel__item-body'>
        <p class='title'>dolphin</p>
        <p>Unicode: U+1F42C</p>
      </div>
    </div>
  </div>
</div>

【讨论】：