ScrollTrigger fromTo jumping

[iDVB 10 Likes (Newbie)]

Is there an obvious reason why this scrollTrigger animation JUMPS down into its initial location?

I thought it might be the immediateRender.... but I've even tried setting it to true but it only fixes the scrolling into the start trigger.... when you scroll OUT of the start trigger it still jumps.

 

Essentially, we placed an item in the ideal location with css. Then we want to setup a scrollTrigger animation that moves that item from just above its initial Y to just below its initial Y. 

 

 

    gsap
      .timeline({
        scrollTrigger: {
          trigger: container,
          scrub: true,
          start: 'top bottom',
          end: 'bottom top',
          markers: true,
        },
      })
      .fromTo(
        circle,
        {
          y: '+=100px',
        },
        { y: '-100px', ease: 'none' },
        0
      )
      .fromTo(
        bubble,
        {
          y: '-=150px',
        },
        { y: '+150px', ease: 'none' },
        0
      );

 

[ZachSaucier 7,130 Likes (Superhero)]

Hey iDVB. It's hard to say based on only the given information. Can you please create a minimal demo using CodePen?

 

 

Also note that you can leave out the "px" in your y values if you want to.

[iDVB 10 Likes (Newbie)]

Thanks @ZachSaucier,

Ya working on an example now... but unable to replicate the issue so far.

[iDVB 10 Likes (Newbie)]

Ok, Got it!

This shows the issue... actually even worse, as it seems to even jump WAY down the page after the animation as well.

 

https://codesandbox.io/s/admiring-lalande-qftns?file=/src/RedefinedAnimation.js

[ZachSaucier 7,130 Likes (Superhero)]

When I edit your demo to get rid of the unnecessary = and + operators the issue seems to go away. What did you have them for? https://codesandbox.io/s/eager-http-gyobf

[iDVB 10 Likes (Newbie)]

Thought it was needed... but on closer inspection it appears not. 

We got it working this way now....

https://codesandbox.io/s/elegant-sammet-3dk9x?file=/src/RedefinedAnimation.js

 

Thanks!