sagar_dev Posted November 19, 2022 Share Posted November 19, 2022 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 More sharing options...
sagar_dev Posted November 19, 2022 Author Share Posted November 19, 2022 I want to make texts appear from below as in this video. I was recreating just the text animation. Link to comment Share on other sites More sharing options...
GSAP Helper Posted November 20, 2022 Share Posted November 20, 2022 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! 2 Link to comment Share on other sites More sharing options...
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