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rotationX get? and/or Computed Properties in JS

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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 Some information, especially the syntax, may be out of date for GSAP 3.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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Hey guys, I am working on this example with a card rotator based on a GS CodePen.


Each card rotates forward twice and moves to the next one.

What I would like to do is rotate a card once and then move to the next/random one.

In AS3 I would do something like this

if(cardsArray[currentCard].rotationX == -360)
if(cardsArray[currentCard].rotationX == -180)

I tried looking up Computed Properties in JS but I think I'm barking up the wrong tree.

Any help on this subject would be helpful. I'm a little fried at the moment



- P




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Not too long ago I created some stuff with random ordering inside a timeline. Give the following code a try:

var elements = $(".elementClass"),//create an JQuery object with all the DOM elements
    elementsAmount = elements.length,//amount of elements in the array
    selected = [],//empty array
    count = 0,//how many elements are selected
    tl = new TimelineMax();//your master timeline

function populateTimeline()//function to add the tweens in the timeline
    if(count < elementsAmount)//are all elements selected?
        var getNum = getNumber(elementsAmount)//get a random number
        if($.inArray(getNum, selected) < 0)//check if the number has been selected already
            tl.to(elements[getNum], time, {/*tween vars*/});
            count++;//one more element has been selected
            populateTimeline();//execute the function again
        else//the number has been selected
            populateTimeline();//execute the function again


function getNumber(number)//function to get the random number
    num = Math.round(Math.random() * (number-1));
    return num;

Also if you want to create a new sequence once the timeline has ended you can add a callback that clears the timeline and calls the populate function again, or if you're comfortable with one sequence per page load you can add a repeat:-1 to the timeline.


Hope this helps,



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I guess my long explanation mislead my question.


rotationX is not something I can access in JS the way you would in AS3

I am trying to figure out what the rotationX of a div is so I know which way to tween it each time.

Hope that makes more sense.



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I've setup your page in a

See the Pen vGEDm by jamiejefferson (@jamiejefferson) on CodePen

to make this a bit quicker to test out. I just added an onUpdate to your tweens to show it working:

var output = $('#rotation');
var toDegrees = 180 / Math.PI;
function updateCard()
  output.text(cardsArray[currentCard].prop('_gsTransform').rotationX * toDegrees);

Once a tween has recorded its starting values, it will save a 'secret' _gsTransfrom property on the DOM element. You can get the rotationX value from this (it's stored in radians so you may need to convert back to degrees).

element._gsTransform.rotationX; // standard DOM element
element[0]._gsTransform.rotationX; // jQuery element/collection, or

(remember that _gsTransform won't be available until a tween has been rendered on the element)

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thats what I figured. That there would be a 'secret' property on the element. Interesting.

This explanation helps. 

Thanks for you Pen too. I'm always interested in seeing how other people code stuff. Very cool


Thanks again for the explanation

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