requestAnimationFrame - Snippets

snippet.js

// smooth to top scroll
(function smoothscroll(){
    var currentScroll = document.documentElement.scrollTop || document.body.scrollTop;
    if (currentScroll > 0) {
         window.requestAnimationFrame(smoothscroll);
         window.scrollTo (0,currentScroll - (currentScroll/5));
    }
})();

// scroll event
var scroll = window.requestAnimationFrame;

function loop(){
    // Avoid calculations if not needed
    if (lastPosition == window.pageYOffset) {
        scroll(loop);
        return false;
    } else lastPosition = window.pageYOffset;

    //... calculations

    scroll( loop );
}

// Call the loop for the first time
loop();