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Check if tween var has finished

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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 Some information, especially the syntax, may be out of date for GSAP 3.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 forums,


How do you check if a particular tween variable has played once through and has ended so you could either call tween.play or tween.reverse based on its current position?

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Well the easiest way is using an onComplete and/or onReverseComplete callback in the instance.


Another option is check if the current time is equal to the instance's duration or check the instance's progress, 0 means at the beginning of the instance and 1 means that the instance has finished.


As you can see there are a few options and as usual a reduced codepen sample could really help us narrow down which option could be the best.



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Yup, Rodrigo is right again. I'd probably go the progress() route.


tween = TweenLite.to("#redBox", 1, {x:550})

$("#continue").on("click", function() {
  if(tween.progress() === 1){
  if(tween.progress() === 0){


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