GSAP ScrollTrigger 动画不适用于 Locomotive JS（直到调整 window 大小）

Question

我的站点中有部分正在使用 ScrollTrigger。一旦我实施 Locomotive JS，我所有的 ScrollTrigger 动画都停止工作。

我浏览了论坛，发现 Locomotive 滚动时您需要 update() ScrollTrigger。我实施了这个但没有看到任何结果。

然后，我调整了 window 和我的 ScrollTrigger 动画的大小，它们开始工作了。

简而言之，动画会在调整大小时触发，但不会在页面加载时触发。

我已经实现了 update()，也尝试了 refresh()，但没有成功。

$(function() {

  gsap.registerPlugin(ScrollTrigger);

  function animateFrom(elem, direction) {
    direction = direction || 1;

    var x = 0, y = direction * 100;
    if(elem.classList.contains("gsap_reveal--fromLeft")) {
      x = -100;
      y = 0;
    } else if (elem.classList.contains("gsap_reveal--fromRight")) {
      x = 100;
      y = 0;
    }

    elem.style.transform = "translate(" + x + "px, " + y + "px)";
    elem.style.opacity = "0";

    gsap.fromTo(elem, { x: x, y: y, autoAlpha: 0 }, {
      duration: 2,
      x: 0,
      y: 0,
      autoAlpha: 1,
      ease: "expo",
      overwrite: "auto"
    });

  }

  function hide(elem) {
    gsap.set(elem, { autoAlpha: 0 });
  }

  gsap.utils.toArray(".gsap_reveal").forEach(function(elem) {
    hide(elem); // assure that the element is hidden when scrolled into view
    ScrollTrigger.create({
      trigger: elem,
      onEnter: function() { animateFrom(elem) },
      onEnterBack: function() { animateFrom(elem, -1) },
      onLeave: function() { hide(elem) } // assure that the element is hidden when scrolled into view
    });
  });

    const pageContainer = document.querySelector("[data-scroll-container]");

    const scroll = new LocomotiveScroll({
      el: pageContainer,
      smooth: true
    });


    // each time locomotive Scroll updates, tell ScrollTrigger to update too (sync positioning)
    scroll.on(pageContainer, ScrollTrigger.update);

    // tell ScrollTrigger to use these proxy methods for the ".data-scroll-container" element since Locomotive Scroll is hijacking things
    ScrollTrigger.scrollerProxy(pageContainer, {
      scrollTop(value) {
        return arguments.length ? scroll.scrollTo(value, 0, 0) : scroll.scroll.instance.scroll.y;
      }, // we don't have to define a scrollLeft because we're only scrolling vertically.
      getBoundingClientRect() {
        return {top: 0, left: 0, width: window.innerWidth, height: window.innerHeight};
      }
    });

    window.addEventListener("load", function (event) {
      ScrollTrigger.refresh();
    });

    ScrollTrigger.addEventListener("refresh", () => scroll.update());
    ScrollTrigger.refresh();


});

.hero {
  min-height: 1000px;
  background: lightblue;
  display: flex;
  align-items: center;
}

.textImageRepeater {
  overflow: hidden;
  padding: 120px 0 160px 0;
}
.textImageRepeater__intro {
  margin-bottom: 66px;
}
.textImageRepeater__layout--row {
  flex-direction: row !important;
}
.textImageRepeater__layout--rowReverse {
  flex-direction: row-reverse !important;
}
.textImageRepeater__item {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding-top: 70px;
  justify-content: space-between;
}
.textImageRepeater__header {
  margin: 17px 0;
}
.textImageRepeater__graphic {
  margin: 0;
}
.textImageRepeater__text, .textImageRepeater__graphic {
  flex-basis: 50%;
}
.textImageRepeater__text {
  max-width: 500px;
}

.c-scrollbar_thumb{
  background-color: #5D209F!important;
  width: 7px;
  margin: 2px;
  opacity: 1;
  border-radius: unset;
  mix-blend-mode: multiply;
}

<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">

<link href="https://cdn.jsdelivr.net/npm/locomotive-scroll@4.1.3/dist/locomotive-scroll.min.css" rel="stylesheet">

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js" integrity="sha512-894YE6QWD5I59HgZOGReFYm4dnWc1Qt5NtvYSaNcOP+u1T9qYdvdihz0PPSiiqn/+/3e7Jo4EaG7TubfWGUrMQ==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>

<script src="https://cdn.jsdelivr.net/npm/locomotive-scroll@4.1.3/dist/locomotive-scroll.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.9.1/gsap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/gsap/3.9.1/ScrollTrigger.min.js"></script>

<div data-scroll-container>
  <div data-scroll-section>

    <section class="hero">
      <div class="container">
        <div class="row justify-content-center justify-content-xl-between">
          <div class="col-12 col-md-10 col-lg-9 col-xl-5">
            <div class="hero__text text-center text-xl-start">
              <h1 class="hero__title" data-scroll data-scroll-speed="2">Title</h1>
            </div>
          </div>
        </div>
      </div>
    </section>

    <section class="textImageRepeater">
      <div class="container">
        <div class="row">
          <div class="col-12">

            <div class="textImageRepeater__item textImageRepeater__layout--row">
              <div class="textImageRepeater__text text-center text-md-start gsap_reveal gsap_reveal--fromRight">
                <div class="textImageRepeater__copy">
                  <h2>Header</h2>
                  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
                </div>
              </div>
              <div class="textImageRepeater__graphic text-center gsap_reveal gsap_reveal--fromLeft">
                <img class="textImageRepeater__image" src="https://picsum.photos/200/300" alt="placeholder-image" loading="lazy">
              </div>
            </div>

            <div class="textImageRepeater__item textImageRepeater__layout--rowReverse">
              <div class="textImageRepeater__text text-center text-md-start gsap_reveal gsap_reveal--fromRight">
                <div class="textImageRepeater__copy">
                  <h2>Header</h2>
                  <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
                </div>
              </div>
              <div class="textImageRepeater__graphic text-center gsap_reveal gsap_reveal--fromLeft">
                <img class="textImageRepeater__image" src="https://picsum.photos/200/300" alt="placeholder-image" loading="lazy">
              </div>
            </div>

          </div>
        </div>
      </div>
    </section>

  </div>
</div>

测试 1

我意识到，如果我注释掉所有 locomotive js 和运行:

$(window).on('scroll', function() {
  console.log("test");
});

logs 会显示，但当 locomotive 激活时它们不会显示。

不确定这是否表明出了什么问题？

测试 2

在我的代码片段的末尾，我运行下面检查 refresh() 是否偶数运行ning 并且它返回 else 语句。同样，不确定为什么。

if (ScrollTrigger.refresh()){
  console.log("true");
} else{
  console.log("false");
}

重建步骤：

Open this fiddle
将输出框加宽一些（即 1300px）
运行 fiddle
向下滚动，您会看到元素未加载
将输出框缩小
scrollTrigger 动画现在出现

这是展示问题的 gif：

Answer 1

这些是我尝试获取动画的内容运行。

1.让 ScrollTrigger 知道新的滚动条。

当您使用机车滚动时，这意味着 ScrollTrigger 所基于的本机滚动已被删除。所以我们通过这样做把它带回来：

ScrollTrigger.create({
    scroller: "[data-scroll-container]" // this is what you're missing
    // your other options
});

阅读 docs for ScrollTrigger > scroller

2。最后分配 ScrollTrigger 补间。

我不太确定，但原因可能很简单，一旦设置了整个滚动系统就需要分配补间。

// init Locomotive
// ...

// create ScrollTrigger
gsap.utils.toArray(".gsap_reveal").forEach(function(elem) {
    hide(elem); // assure that the element is hidden when scrolled into view
    ScrollTrigger.create({
      scroller: "[data-scroll-container]",
      trigger: elem,
      onEnter: function() { animateFrom(elem) },
      onEnterBack: function() { animateFrom(elem, -1) },
      onLeave: function() { hide(elem) } // assure that the element is hidden when scrolled into view
    });
  });

见JSFiddle

GSAP ScrollTrigger 动画不适用于 Locomotive JS（直到调整 window 大小）

GSAP ScrollTrigger animations not working with Locomotive JS (until window is resized)

javascript

jquery

gsap

locomotive-scroll

scrolltrigger