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How to Trigger 'onStart()' when seeking() ?

dazzafact2 test
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Go to solution Solved by Rodrigo,

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I am currently trying to capture my Animation-frames for a sequence. For this, I jump to the desired position and generate the image withrenderer.render().(+pixiJs)


But what is still missing is that onStart() is executed to set a variable. This does not trigger -even with play()! How can execute it manual: onStart:()?


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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 all the 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/Vue/Nuxt or some other framework, you may find StackBlitz easier to use. We have a series of collections with different templates for you to get started on these different frameworks: React/Next/Vue/Nuxt.


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

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  • Solution

Hi @dazzafact2 and welcome to the GreenSock forums!


You're looking for the second parameter in the seek() method, called suppressEvents:



The same applies to the play() and other similar methods:



const tl = gsap.timeline();

// Jump to 3 seconds and execute any callbacks or methods
tl.seek(3, false);


Hopefully this helps.

Happy Tweening!

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