swipe javascript

var touchstartX = 0;
var touchstartY = 0;
var touchendX = 0;
var touchendY = 0;

var gesuredZone = document.getElementById('cal');

gesuredZone.addEventListener('touchstart', function(event) {
    touchstartX = event.changedTouches[0].screenX;
    touchstartY = event.changedTouches[0].screenY;
}, false);

gesuredZone.addEventListener('touchend', function(event) {
    touchendX = event.changedTouches[0].screenX;
    touchendY = event.changedTouches[0].screenY;
    handleGesure();
}, false); 

function handleGesure() {
    var swiped = [];
    if (touchendX < touchstartX) {
    	swiped.push('left');
    }
    if (touchendX > touchstartX) {
    	swiped.push('right');
    }
    if (touchendY < touchstartY) {
    	swiped.push('down');
    }
    if (touchendY > touchstartY) {
    	swiped.push('left');
    }
    if (touchendY == touchstartY) {
    	swiped.push('tap');
    }
    //console.log(swiped);
    if(swiped[0] == "left") jQuery('.btn.btn-next').click();
    if(swiped[0] == "right") jQuery('.btn.btn-prev').click();
}