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Proper use of onComplete callback

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 Some information, especially the syntax, may be out of date for GSAP 3.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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Trying to test onStart and onComplete callbacks:


this code write 'play' and 'finish' in the console at the same time (immediately start time). What is wrong here? How can I fire a function when timeline ends?




function bannerDown(){
      let tl = new TimelineMax({
        onStart: console.log('play'),
        onComplete: console.log('finish'),
        .to('.content', .5, {
          paddingTop: bannerHeight,
          ease: Power4.easeOut,
        }, 0)
        .to('.banner', .5, {
          y: 0,
          height: 'auto',
          ease: Power4.easeOut,
        }, 0);
        return tl;
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Hi and welcome to the GreenSock forums,


When you specify callbacks you should not include any () as that will tell those functions to execute immediately.

You just pass the name of the function like:

let tl = new TimelineMax({
        onStart: myOnStartFunction

function myOnStartFunction(){

 // do stuff



In the case where you need to pass parameters, you do that separately as an array

var tl = new TimelineLite({onStart:console.log, onStartParams:["start"], onComplete:console.log, onCompleteParams:["complete"]})

tl.to("h1", 3, {x:200});



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Yes! Thank you very much for the quick and accurate answer.

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