Handle multitouch events in web application
By Kajetan Wilczek
You can add multitouch support to your web application using touch events. To do it you can check number of touch points (e.g. event.touches).
var obj = document.getElementById('id');
// detect 2 fingers tap
obj.addEventListener('touchstart', function(event) {
if (event.touches.length == 2) {
// handle 2 fingers tap
}
}, false);