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Dave Stewart

Animate one property dependant on another

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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 Some information, especially the syntax, may be out of date for GSAP 3.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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Is it possible to animate a property of an object based on the value of something else?


I'd like to animate a parallax effect, so it would be useful to animate all but the top layer based on fractions of the top layer's left property.



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Sure, you would just use an onUpdate callback to modify any number of objects based on the properties of the element you are animating


var red = document.getElementById("redBox"),
    blue = document.getElementById("blueBox");

var t = TweenLite.to(red, 1, {left:550, onUpdate:parallax})

function parallax() {
  //the blue box will only travel half the distance
  blue.style.left = parseInt(red.style.left) * 0.5 + "px";



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