ScrollTriger problem

[Borman]

The gallery is written in scrollTrigger gsap. I want to get this result: https://tanyatimal.studio/portraits/hypnomoves-maria. Everything works, but if you scroll several times, it creates a lot of scrollTrigger. Here is the code:

const panels = gsap.utils.toArray(".gallery__item");
  let panelsContainer = document.querySelector(".gallery__wrap");
  let prevSectionIndex = -1;

  // Function to animate a specific panel
  function animatePanel(panelIndex) {
    gsap.to(panels[panelIndex], {
      scale: 0.7,
      scrollTrigger: {
        trigger: panels[panelIndex + 1],
        start: "top top",
        scrub: 1,
        markers: 1,
      },
    });
    console.log("animate " + panelIndex);
  }

  let tween = gsap.to(panels, {
    xPercent: -100 * (panels.length - 1),
    ease: "none",
    scrollTrigger: {
      trigger: ".gallery__wrap",
      pin: true,
      start: "top top",
      scrub: 1,
      onUpdate: (self) => {
        const progress = self.progress;
        const sectionIndex = Math.round(progress * (panels.length - 1));
        if (sectionIndex !== prevSectionIndex) {
          //console.log(sectionIndex);

          animatePanel(sectionIndex - 1);

          prevSectionIndex = sectionIndex;
        }
      },
      end: () => "+=" + (panelsContainer.offsetWidth - innerWidth),
    },
  });

I can't understand what the problem is. I have tried many things, but I want to solve it using gsap. thanks for any help.

[GSAP Helper]

Hi @Borman and welcome to the GSAP Forums!

 

It's very difficult to troubleshoot without a minimal demo; the issue could be caused by CSS, markup, a third party library, your browser, an external script that's totally unrelated to GSAP, 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. If not, incrementally add code bit by bit until it breaks. Usually people solve their own issues during this process! If not, then at least we have a reduced test case which greatly increases your chances of getting a relevant answer.

 

Here's a starter CodePen that loads all the plugins. Just click "fork" at the bottom right and make your minimal demo: 

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

 

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: 

• React (please read this article!)
• Next
• Svelte
• Sveltekit
• Vue
• Nuxt

 

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. 

 

Maybe you should take a look at the Container Animation feature ScrollTrigger has:

https://gsap.com/blog/3-8/#containeranimation