javascript scroll on stop

var scrollStop = function (callback) { // Make sure a valid callback was provided if (!callback || typeof callback !== 'function') return; // Setup scrolling variable var isScrolling; // Listen for scroll events window.addEventListener('scroll', function (event) { // Clear our timeout throughout the scroll window.clearTimeout(isScrolling); // Set a timeout to run after scrolling ends isScrolling = setTimeout(function() { // Run the callback callback(); }, 66); }, false); };