Problem with scrollTrigger in React. Please help me I am new to GSAP

[Ashish Sharma]

I want this kind of effect in react :  .
Wanted above pin effect in react but not working here : https://codesandbox.io/s/focused-blackwell-hkw5p6?file=/src/App.js
I have created this codepen and its working fine but not in react (sandbox link above for reaact) but I am not able to understand where I am doing wrong to implement this kind of pin element for atleast 200%  but I am getting redudant whitespaces event after using pinSpacing:false and I am also getting triggered element multiple times .when trigger start and end.

See the Pen gOQmZmv by admireasia (@admireasia) on CodePen

[mvaneijgen]

Hi @Ashish Sharma welcome to the forum! 

Proper animation cleanup is very important with frameworks, but especially with React. React 18 runs in strict mode locally by default which causes your useEffect() and useLayoutEffect() to get called TWICE.

In GSAP 3.11, we introduced a new gsap.context() feature that helps make animation cleanup a breeze. All you need to do is wrap your code in a context call. All GSAP animations and ScrollTriggers created within the function get collected up in that context so that you can easily revert() ALL of them at once.

Here's the structure:

// typically it's best to useLayoutEffect() instead of useEffect() to have React render the initial state properly from the very start.
useLayoutEffect(() => {
  let ctx = gsap.context(() => {
    // all your GSAP animation code here
  });
  return () => ctx.revert(); // <- cleanup!
}, []);

This pattern follows React's best practices, and one of the React team members chimed in here if you'd like more background.

We strongly recommend reading the React information we've put together at https://greensock.com/react

Happy tweening!

[Ashish Sharma]

Thank You so much