tap for xui

xui-tap.js

(function(){

var hasTouch = 'ontouchstart' in window;

x$.extend({
    tap: function(fn, delay){
        // browser fallback
        if(!hasTouch){
            return this.each(function(){
                x$(this).click(fn);
            });
        }

        delay = delay || 50;
        var moveAmount = 10;
        return this.each(function(){
            var start = 0,
                x = null,
                y = null;

            x$(this).touchstart(function(e){
                start = e.timeStamp;

                var t = e.touches[0];
                x = t.screenX;
                y = t.screenY;

                e.preventDefault();

            }).touchend(function(e){
                var t = e.changedTouches[0];
                if((Math.abs(t.screenX - x) <= moveAmount && Math.abs(t.screenY - y) <= moveAmount) || 
                    e.timeStamp - start < delay){
                    fn.apply(this);
                }
                x = null;
                y = null;
            });
        });
    }
});

})();