You are probably looking for the set:scroll
event that is fired on the Scroll View object: https://developer.playcanvas.com/en/api/pc.ScrollViewComponent.html#event:set:scroll
eg https://playcanvas.com/editor/scene/1056055
var Main = pc.createScript('main');
Main.attributes.add('scrollViewEntity', {type: 'entity'});
// initialize code called once per entity
Main.prototype.initialize = function() {
this.scrollViewEntity.scrollview.on('set:scroll', function (position) {
console.log(position);
}, this);
};