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Tracing default Attributes like Opacity, Top and Left onUpdate (_gsTransform)

themepunch test
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Go to solution Solved by Diaco,

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 Some information, especially the syntax, may be out of date for GSAP 3.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 Guys,


I would like to trace the opacity / top / left attributes of an element during the Tween, how would i get the values the most effective way ?  


I know that transform attributes are written on the element with the object  tween.target._gsTransform however opacity, top and left attributes are not written within this object.


I would like to avoid to read on every update the css attribute and get values from there! 


Something like this:

var t = TweenLite.fromTo("#box", 1, {
  opacity: 0
}, {
  opacity: 1,
  onUpdate: getValue,
  onUpdateParams: ["{self}"]

function getValue(tween) {
  var element = tween.target;  
  /*jQuery('#trace').html("Trace:" + element._gsTransform.opacity);*/

Thanks a lot,


Krisztian from ThemePunch

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  • Solution

Hi themepunch  :)


pls try like this :


function getValue() {
  var target = this.target[0];
  var tLeft = target.style["left"];
  var tOpacity = target.style["opacity"];

pls check this out : 

See the Pen KVzMQo by MAW (@MAW) on CodePen

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