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Draggable scroll: How to get current scroll position?

luneyard test
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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 Some information, especially the syntax, may be out of date for GSAP 3.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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I am trying to build a UI where two arrows – up and down – control the scroll position.

The scroll element is a Draggable.

var scroller = $('.scroller.draggable');

Draggable.create(scroller, {
        onDragStart: function() {
        onDragEnd: function() {

$('.icon-arrow-down').on('click', function(event){
        TweenLite.to(scroller, 1, {scrollTo:{y:$scope.yStart}, ease:Power2.easeOut, onComplete:updateYScroll});
        function updateYScroll() {
            //$scope.yStart = scroller.scrollY + $scope.yIncrement;

But when calling scrollY I always get undefined...




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Hello luneyard, and welcome to the GreenSock Forum!


I believe scrollY is only available on the window object.


Please see: https://developer.mozilla.org/en-US/docs/Web/API/Window/scrollY


I believe you are looking for using scrollTop instead:


Please see: https://developer.mozilla.org/en-US/docs/Web/API/Element/scrollTop

// Get the number of pixels scrolled
var  myScrollTop = this.scrollTop;


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Also note that you can check the Draggable's "y" property which is basically scrollTop in the opposite direction (so make it negative)


You can also use the methods on the scrollProxy of the Draggable as well:

yourDraggable.scrollProxy.scrollTop(); //returns the scroll position
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