css - 更改 Bootstrap Carousel 淡入淡出过渡

Question

在 Stackoverflow 上有几个关于 Carousel 淡入淡出过渡的问题，但似乎都不适用于默认的 4.0.0 实现:

<div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
  <ol class="carousel-indicators">
    <li data-target="#carouselExampleIndicators" data-slide-to="0" class="active"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="1"></li>
    <li data-target="#carouselExampleIndicators" data-slide-to="2"></li>
  </ol>
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img class="d-block w-100" src="..." alt="First slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Second slide">
    </div>
    <div class="carousel-item">
      <img class="d-block w-100" src="..." alt="Third slide">
    </div>
  </div>
  <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
    <span class="carousel-control-prev-icon" aria-hidden="true"></span>
    <span class="sr-only">Previous</span>
  </a>
  <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
    <span class="carousel-control-next-icon" aria-hidden="true"></span>
    <span class="sr-only">Next</span>
  </a>
</div>

自 Alpha.6 版本以来，bootstrap 是否改变了 carousel-item -s 的转换方式？在 4.0.0 中如何实现淡入淡出过渡而不是滑动？

Answer 1

Bootstrap 5 Carousel Fade(2021 年更新)

Bootstrap 5 includes a "fade" effect只需将 carousel-fade 类添加到 Carousel 即可使用。默认情况下，过渡持续时间为 0.6 秒。要增加持续时间并使幻灯片之间的淡入淡出速度变慢，请覆盖 CSS 上的过渡时间...

/* change transition duration to control the speed of fade effect */
.carousel-item {
  transition: transform 2.6s ease-in-out;
}

.carousel-fade .active.carousel-item-start,
.carousel-fade .active.carousel-item-end {
  transition: opacity 0s 2.6s;
}

Bootstrap 5 Carousel Fade Slower

---

Bootstrap 4.0 Carousel Fade(原答案)

.carousel-fade .carousel-item {
 opacity: 0;
 transition-duration: .6s;
 transition-property: opacity;
}

.carousel-fade  .carousel-item.active,
.carousel-fade  .carousel-item-next.carousel-item-left,
.carousel-fade  .carousel-item-prev.carousel-item-right {
  opacity: 1;
}

.carousel-fade .active.carousel-item-left,
.carousel-fade  .active.carousel-item-right {
 opacity: 0;
}

.carousel-fade  .carousel-item-next,
.carousel-fade .carousel-item-prev,
.carousel-fade .carousel-item.active,
.carousel-fade .active.carousel-item-left,
.carousel-fade  .active.carousel-item-prev {
 transform: translateX(0);
 transform: translate3d(0, 0, 0);
}

---

淡入淡出效果在 4.0 Beta 期间从轮播中移除，并且在 4.0.0 中也不可用。这pull request表示淡入淡出效果将在 4.1 或 4.2 中返回。同时，上述 CSS 将适用于 4.0.0

https://codeply.com/go/LhLJlldsLN