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onRepeat does not fire for each repetition that occurs when tab is inactive.

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This thread was started before GSAP 3 was released. Some information, especially the syntax, may be out of date for GSAP 3. Please see the GSAP 3 migration guide and release notes for more information about how to update the code to GSAP 3's syntax. 

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Hey guys,

Found some behaviour that's causing me issues.

I have an animation of a vehicle, that's yoyo-ing from left to right infinitely. In the onRepeat callback i'm flipping scaleX between 1 & -1 to flip the graphic.


The problem happens when the browser tab is not active.

The timeline may have repeated multiple times, however the onRepeat callback is only fired once when focus is returned to the tab.


Therefore the orientation of the graphic can become out of sync with the actual direction.


I realise that RAF halts all callbacks when the tab is inactive so, but I would have expected the onRepeat callback to be fired retroactively for the number of times the animation has technically repeated.


Is the behaviour intended or a GSAP bug?


For the moment I have changed my code to manually change direction based on the x vector in the onUpdate callback.


Hope I've not rambled too much :)

Look forward to your reply.




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Hey Rodrigo

Many thanks for the message, that looks like exactly what I need!

Sorry for the duplication.



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Don't worry, glad it helped.




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