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When the page is scrolled, I want to assign a 1-time active class, I don't want it to be on enter or onleaveback again

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It's pretty tough 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 CodeSandbox that demonstrates the issue? 


Please don't include your whole project. Just some colored <div> elements and the GSAP code is best (avoid frameworks if possible). 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


If you're using something like React/Next/Vue/Nuxt or some other framework, you may find StackBlitz easier to use. We have a series of collections with different templates for you to get started on these different frameworks: React/Next/Vue/Nuxt.


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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Hi @tolgahan61 and welcome to the GreenSock forums!


Maybe you're using toggleClass for this class? As mentioned before without a demo is really hard for us to know.


What you could try is just add a class to an element using an onEnter callback in your ScrollTrigger configuration:

let classAdded = false;

gsap.to(element, {
  scrollTrigger: {
    onEnter: () => {
      // Don't do anything if the class has been added already
      classAdded && return;
      classAdded = true;

Hopefully this helps. If you keep having issues please remember to include a minimal demo.

Happy Tweening!

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Or maybe something like: 

  trigger: element,
  start: "top bottom",
  onEnter: () => element.classList.add("active"),
  once: true


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thank you for your quick reply i solved the problem myself

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