Treat touch events as mouse events. Useful for legacy code that you cannot change but could load a small piece to support touch events.

treat_touch_events_as_mouse_events.js

/* First we need to listen to touch events and call a function 'touch2Mouse' each time a touch event is fired:
*/
document.addEventListener("touchstart", touch2Mouse, true);
document.addEventListener("touchmove", touch2Mouse, true);
document.addEventListener("touchend", touch2Mouse, true); 

/* The following function will initiate and fire mouse events (event.initMouseEvent), for each touch events type we'll fire the equivalent mouse event :
*/
Touchstart  =>  Mousedown
Touchend  =>  Mouseup
Touchmove  =>  Mousemove

/* and then we will cancel the original touch event using preventdefault :*/
function touch2Mouse(e)
{
  var theTouch = e.changedTouches[0];
  var mouseEv;

  switch(e.type)
  {
    case "touchstart": mouseEv="mousedown"; break;  
    case "touchend":   mouseEv="mouseup"; break;
    case "touchmove":  mouseEv="mousemove"; break;
    default: return;
  }

  var mouseEvent = document.createEvent("MouseEvent");
  mouseEvent.initMouseEvent(mouseEv, true, true, window, 1, theTouch.screenX, theTouch.screenY, theTouch.clientX, theTouch.clientY, false, false, false, false, 0, null);
  theTouch.target.dispatchEvent(mouseEvent);

  e.preventDefault();
}