Simple touch to (left) mouse click shim

touchmouse.js

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// Simple touch to (left) mouse click shim by Michael Nischt

/*jslint browser: true*/

(function (document) {
    "use strict";

    function touchHandler(event) {

        var type = "";

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

        var first = event.changedTouches[0]; //NOTE: or use the average of all
        var simulatedEvent = document.createEvent("MouseEvent");
        //initMouseEvent(type, canBubble, cancelable, view, clickCount,
        //           screenX, screenY, clientX, clientY, ctrlKey,
        //           altKey, shiftKey, metaKey, button, relatedTarget);
        simulatedEvent.initMouseEvent(type, true, true, event.view, 1,
                first.screenX, first.screenY,
                first.clientX, first.clientY, false,
                false, false, false, /*left*/0, null);

        first.target.dispatchEvent(simulatedEvent);
        //event.preventDefault();
    }

    document.addEventListener("touchstart", touchHandler, true);
    document.addEventListener("touchmove", touchHandler, true);
    document.addEventListener("touchend", touchHandler, true);
    document.addEventListener("touchcancel", touchHandler, true);
    document.addEventListener("touchleave", touchHandler, true);
}(document));