When I click or scroll down a bit and stop and than scroll again the animation breaks

endrit · January 25

Hi everyone,

I'm trying to build an animation where I have two blocks of text, and when I scroll, it will show the first block. Using Split Type, I've created an animation where the text gets filled. Once the first block is filled, it should hide, and the second block should appear with the same text fill animation.

However, I'm encountering an issue where the animation breaks, mostly on mobile and sometimes on desktop. When I scroll, stop, and then scroll again—especially when I'm in the second block—the animation resets, and the text overlays with each other.

I have turned on the markers, and when this happens, I can see the start and end changes.

I would really appreciate any feedback and help.

Video: https://youtube.com/shorts/XL3N8pri2rg?feature=share

Here is the code:

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <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>
    <title>Document</title>
    <style>
      body {
        background: #003393;
      }
      .text-container-slider {
        /* height: 300vh; */
        width: 100%;
        max-width: 100vw;
        font-family: Poppins;
        will-change: transform;
        position: relative;
        height: 300vh;
        /* mix-blend-mode: multiply; */
      }
      .text-section-slider {
        left: 0;
        width: 100%;
        height: 100vh;
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        opacity: 1;
        position: sticky;
        top: 0;
        pointer-events: none; /* Allow scrolling through sections */
        color: #fff;
        will-change: transform;
      }
      .text-section-container {
        max-width: 1200px;
        display: flex;
        width: 100%;
      }
      .text-card {
        line-break: normal;
        width: 80%;
        margin: 0 auto;
      }
      .text-section-container > .text-card > p {
        font-family: Poppins;
        font-size: 20px;
        font-weight: 400;
        color: #fff;
        line-height: 30px;
        letter-spacing: 0px;
        text-align: left;
      }
      .list-grid ul li {
        margin: 40px 0;
        background: url("https://i.ibb.co/LzK07Vz/line-type.png") no-repeat left
          center;
        padding: 10px 10px 10px 35px;
        list-style: none;
        margin: 0;
        vertical-align: middle;
        font-size: 20px;
      }

      .list-grid {
        display: flex;
      }
      .list-grid ul {
        flex-basis: 50%;
        padding-left: 0;
        padding-top: 0;
      }
      .text-section-container .ultitle {
        margin-bottom: 16px;
        margin-top: 40px;
      }
      @media (max-width: 768px) {
        .list-grid {
          flex-direction: column;
        }
        .list-grid ul {
          margin: 0;
        }
        .text-section-container .ultitle {
          margin-bottom: 5px;
          margin-top: 40px;
        }
        .text-section-container > .text-card > p,
        .list-grid ul li {
          font-size: 1rem;
        }
        .text-card {
          width: 99%;
        }
      }
    </style>
  </head>
  <body>
    <div class="text-totalContainer">
      <div class="text-container-slider">
        <div class="text-section-slider" id="text-section1">
          <div class="text-section-container">
            <div class="text-card">
              <p class="text-sec-1">
                Aus mittlerweile weit über 400 erfolgreich umgesetzten und
                dokumentierten B2B Fallbeispielen wissen wir, dass der größte
                Dominostein bei einer systematisierten Skalierung von IT und
                Beratungsunternehmen im Frontend-Sales liegt.
              </p>
              <p class="text-sec-1 ultitle">Frontendsales:</p>
              <div class="list-grid">
                <ul>
                  <li class="text-sec-1">
                    Recherchieren der richtigen Zielpersonen
                  </li>
                  <li class="text-sec-1">Ausfindig machen der Kontaktdaten</li>
                </ul>
                <ul>
                  <li class="text-sec-1">Ansprache der Zielpersonen</li>
                  <li class="text-sec-1">Qualifizieren der Interessenten</li>
                </ul>
              </div>
            </div>
          </div>
        </div>
        <div class="text-section-slider" id="text-section2">
          <div class="text-section-container">
            <div class="text-card">
              <p class="text-sec-2">
                Mindestens. 80% der gesamten Zeit wird mit
                frontendsales-Aktivitäten wortwörtlich verschwendet.
              </p>
              <p class="text-sec-2 ultitle">
                Lediglich. 20% der Zeit wird dafür verwendet, wirksamen
                Verkaufsaktivitäten nachzugehen wie:
              </p>
              <div class="list-grid">
                <ul>
                  <li class="text-sec-2">
                    Durchführen von Beratungsgesprächen
                  </li>
                  <li class="text-sec-2">Vorstellungen der Lösungen</li>
                </ul>
                <ul>
                  <li class="text-sec-2">
                    Arbeiten mit bestehenden Oppurtunities
                  </li>
                  <li class="text-sec-2">Workshops mit Kunden abhalten</li>
                </ul>
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
    <script src="https://unpkg.com/split-type"></script>
    <script>
      document.addEventListener("DOMContentLoaded", function () {
        const sectionstext = document.querySelectorAll(".text-section-slider");
        const textsec1 = SplitType.create(".text-sec-1");
        const textsec2 = SplitType.create(".text-sec-2");

        function initScrolltext() {
          sectionstext.forEach((sectiontext, indextext) => {
            const cardstext = sectiontext.querySelector(".text-card");
            gsap.config({ performance: true });
            const tltext = gsap.timeline({
              scrollTrigger: {
                trigger: sectiontext,
                scrub: true,
                markers: true,
                start: "top 0%",
                end: "bottom+=70px 30%",
                toggleActions: "play reset play reset",
              },
            });
            if (indextext > 0) {
              tltext
                .fromTo(
                  cardstext,
                  {
                    opacity: 0,
                    stagger: 3,
                  },
                  {
                    opacity: 1,
                    ease: "power2.out", // Adjust easing for a smoother transition
                  }
                )
                .fromTo(
                  sectiontext,
                  {
                    opacity: 0,
                  },
                  {
                    opacity: 1,
                    ease: "power2.out", // Adjust easing for a smoother transition
                  }
                )
                .from(textsec2.words, {
                  opacity: 0.2,
                  stagger: 0.1,
                })
                .fromTo(
                  sectiontext,
                  {
                    opacity: 1,
                  },
                  {
                    opacity: 1,
                    ease: "power2.out", // Adjust easing for a smoother transition
                  }
                );
            } else {
              tltext
                .from(textsec1.words, {
                  opacity: 0.2,
                  stagger: 0.1,
                })
                .fromTo(
                  cardstext,
                  {
                    opacity: 1,
                  },
                  {
                    opacity: 1,
                    ease: "power2.out", // Adjust easing for a smoother transition
                  }
                )
                .fromTo(
                  sectiontext,
                  {
                    opacity: 1,
                  },
                  {
                    opacity: 0,
                    ease: "power2.out", // Adjust easing for a smoother transition
                  }
                );
            }
          });
        }
        initScrolltext();
      });
    </script>
  </body>
</html>

GSAP Helper · January 25

Without a minimal demo, it's very difficult to troubleshoot; the issue could be caused by CSS, markup, a third party library, a 3rd party script, etc. Would you please provide a very simple CodePen or Stackblitz that illustrates the issue?

Please don't include your whole project. Just some colored <div> elements and the GSAP code is best. See if you can recreate the issue with as few dependancies as possible. Start minimal and then incrementally add code bit by bit until it breaks. Usually people solve their own issues during this process! If not, at least we have a reduced test case which greatly increases your chances of getting a relevant answer.

See the Pen aYYOdN by GreenSock (@GreenSock) on CodePen

that loads all the plugins. Just click "fork" at the bottom right and make your minimal demo:

Using a framework/library like React, Vue, Next, etc.?

CodePen isn't always ideal for these tools, so here are some Stackblitz starter templates that you can fork and import the gsap-trial NPM package for using any of the bonus plugins:

Please share the StackBlitz link directly to the file in question (where you've put the GSAP code) so we don't need to hunt through all the files.

Once we see an isolated demo, we'll do our best to jump in and help with your GSAP-specific questions. ✅

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When I click or scroll down a bit and stop and than scroll again the animation breaks

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