Swipe event-handler

Swipe event-handler

var initialPoint;
    var finalPoint;
    document.addEventListener('touchstart', function(event) {
    event.preventDefault();
    event.stopPropagation();
    initialPoint=event.changedTouches[0];
    }, false);
    document.addEventListener('touchend', function(event) {
    event.preventDefault();
    event.stopPropagation();
    finalPoint=event.changedTouches[0];
    var xAbs = Math.abs(initialPoint.pageX - finalPoint.pageX);
    var yAbs = Math.abs(initialPoint.pageY - finalPoint.pageY);
    if (xAbs > 20 || yAbs > 20) {
    if (xAbs > yAbs) {
    if (finalPoint.pageX < initialPoint.pageX){
    /*СВАЙП ВЛЕВО*/}
    else{
    /*СВАЙП ВПРАВО*/}
    }
    else {
    if (finalPoint.pageY < initialPoint.pageY){
    /*СВАЙП ВВЕРХ*/}
    else{
    /*СВАЙП ВНИЗ*/}
    }
    }
    }, false);