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Can I rely on onStart/onComplete inline function declared within a timelineMax.to()

Peter test
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Warning: Please note

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 Some information, especially the syntax, may be out of date for GSAP 3.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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Hi I'm still quite fresh with my js and just trying to work out if what I'm experiencing is a problem with my code, or whether it's a gsap bug, or it's not even supposed to work how I expected.


For example a part of my code that looks like the below, the following happens (as per console description):

var tl = new TimelineMax({onComplete:function(){
	console.log('I get called')

tl.to($('#sectionWrapper'), 0.5, {scrollTo: {x: targetX}, onStart:function(){
	console.log('i also get called')
onComplete: function (){
	console.log('but i don\'t get called');

I was expecting all console logs to happen... should they?

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Hi and welcome to the GreenSock forums.


Very odd that callbacks wouldn't fire.


I made a little test that runs a timeline 200 times and has 3 callbacks per timeline just like yours:

See the Pen 0441d2c046957419b95410c6749aae14 by GreenSock (@GreenSock) on CodePen


It counts 600 callbacks firing.


I have also tested running 1000 times and it never failed, even on IE8 win7.


Can you give us more info to help us replicate the issue you are experiencing?

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Hi, thanks for the reply.


I'll need to clean my code up a bit (probable it was just a problem with my code) and then I'll see if I can replicate it and will let you know either way.

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