Sections are jumping unevenly with the data-lag attribute

[matashaEs]

Hello🙃

 

I'm a Club Greensock Member and am using ScrollSmoother in my project. 

I added a data-lag attribute to each section for smooth page scrolling. You can see on the video that sections are jumping unevenly, the background image is visible during scrolling. Can this be fixed with "Easing" or some other way?

Thank you in advance

 

 

[GSAP Helper]

It's pretty tough to troubleshoot without a minimal demo - the issue could be caused by CSS, markup, a third party library, your browser, an external script that's totally unrelated to GSAP, etc. Would you please provide a very simple CodePen or CodeSandbox that demonstrates the issue? 

 

Please don't include your whole project. Just some colored <div>elements and the GSAP code is best (avoid frameworks if possible). See if you can recreate the issue with as few dependancies as possible. If not, incrementally add code bit by bit until it breaks. Usually people solve their own issues during this process! If not, then at least we have a reduced test case which greatly increases your chances of getting a relevant answer.

 

Here's a starter CodePen that loads allthe plugins. Just click "fork" at the bottom right and make your minimal demo: 

See the Pen aYYOdN by GreenSock (@GreenSock) on CodePen

 

If you're using something like React/Next/Nuxt/Gatsbyor some other framework, you may find CodeSandbox easier to use. 

 

Once we see an isolated demo, we'll do our best to jump in and help with your GSAP-specific questions. 

[matashaEs]

 

This is my codepen 

See the Pen OJEVLRg by matashaEs (@matashaEs) on CodePen

. The blue background is visible during fast scrolling.

[GreenSock]

Sorry about the delayed response, but this required a deep-dive. The problem here is that the lag effect ScrollTriggers take effect the moment the natural position of the element enters the viewport, and they stop the moment the natural position of the element leaves the viewport (though the animation that returns it to its natural position keeps going until it completes, as it should). You created a situation where the natural position of one element exited while another is still active and could be affected by the scrolling motion inertia. 

 

One way to solve it is to force the effect ScrollTriggers to expand such that their start/end values trigger earlier/later. Here's how you could do that: 

See the Pen ZERperd?editors=0010 by GreenSock (@GreenSock) on CodePen

 

I'm adding 600px of effect "padding", but you can adjust it to whatever you need. 

 

Does that help?