React 18 with GSAP Problem

[Tomasz Olek]

Hi, 

I wanted to create a vertical/horizontal scroll but I've meet a problem where when using react 18, project just dont work.

Could someone help me fix this issue so I can use react 18?

https://codesandbox.io/s/test-forked-i9ng90?file=/src/App.js

[GreenSock]

Welcome to the forums, @Tomasz Olek! 

 

It looks like you just weren't doing proper cleanup. React 18 actually calls useEffect() TWICE in strict mode which catches a lot of people by surprise. It's quite unintuitive in my opinion. So due to that React behavior, you ended up creating multiple tweens/ScrollTriggers that were competing to control the same things simultaneously. 

 

The new gsap.context() is your new best friend in React. I'd strongly recommend reading this article: 

Here's a fork where all I changed was wrapping your code in a gsap.context() and then calling revert() on it in the cleanup function: 

https://codesandbox.io/s/test-forked-sw2bh7?file=/src/App.js

 

Does that clear things up? 

[Tomasz Olek]

Yes, Thank you a lot