jquery custom event to normalize mousedown and touchstart

poke.js

/* global $ */

// Custom jQuery event that normalizes mousedown and touchstart
// based on http://stackoverflow.com/questions/8503453/click-event-called-twice-on-touchend-in-ipad

$.event.special.poke = {
  setup: function() {
    var isTouchSupported = "ontouchstart" in document;
    var poke = isTouchSupported ? "touchstart" : "mousedown";
    $(this).bind(poke + ".poke-event", function(event) {
      event.type = "poke";
      ($.event.dispatch||$.event.handle).call(this, event);
    });
  },
  teardown: function() {
    $(this).unbind(".poke-event");
  }
};