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ScrollTrigger onEnter only fires when scrolling down

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Hey everyone,


onEnter only seems to fire when scrolling down, not strictly when it has entered the viewport (based on the start, end params) as you would expect. I have used onUpdate to get around this but for performance reasons I would like to avoid it. 


Do you have any ideas what I'm doing wrong here?




See the Pen ZExzMXz by TheTomS (@TheTomS) on CodePen

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You need to use onEnterBack: () => {} if you want to do something when you enter backwards. You might also be able to use onToggle but I haven't tried that before.

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Perhaps you're looking for this?: 

See the Pen LYdPKew?editors=0010 by GreenSock (@GreenSock) on CodePen


Steve is correct - onEnter is for when it enters as scroll increases. onEnterBack is for the opposite way. You can use onToggle and isActive to simplify things too, like in the demo:

onToggle: self => self.trigger.innerText = self.isActive ? "In View" : "Not In View"


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