Jump to content
Search Community

GSAP not working properly as it should.

sagar_dev test
Moderator Tag

Recommended Posts

Hello, I was working on personal portfolio site with GSAP and Next.js 13. Previously I have done some project with same setup but in Next.js 12. Every thing worked in previous project but not in current portfolio site. I re-created the issue in code sandbox

https://codesandbox.io/s/boring-nova-tf8cys?file=/src/App.js

 

In code sandbox with react and GSAP it doesn't work at all. It just flashes the elements. I wanted to make texts appear from bottom.

Link to comment
Share on other sites

Yep, I bet the problem is that React 18 runs in "strict" mode locally by default which causes your useEffect() to get called TWICE! Very annoying. It has caused a lot of headaches for a lot of people outside the GSAP community too.

 

.from() tweens use the CURRENT value as the destination and it renders immediately the value you set in the tween, so when it's called the first time it'd work great but if you call it twice, it ends up animating from the from value (no animation). It's not a GSAP bug - it's a logic thing.

 

For example, let's say el.x is 0 and you do this: 

useEffect(() => {
  // what happens if this gets called twice?
  gsap.from(el, {x: 100})
}, []);

 

The first time makes el.x jump immediately to 100 and start animating backwards toward the current value which is 0 (so 100 --> 0). But the second time, it would jump to 100 (same) and animate back to the current value which is now 100 (100 --> 100)!  See the issue?

 

In GSAP 3.11, we introduced a new gsap.context() feature that solves all of this for you. All you need to do is wrap your code in a context call, and then return a cleanup function that reverts things: 

// 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!
}, []);

 

Here's a fork of your demo showing the technique: 

https://codesandbox.io/s/gsap-text-reveal-forked-4ky3pq

 

One of the React team members chimed in here if you'd like more background.

 

We strongly recommend reading the React article at

 

Happy tweening!

  • Like 2
Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...