Cross-browser event object

gistfile1.js

/**
 * Cross-browser event object
 * Adapted from Professional JavaScript for Web Developers, 3rd Edition, by Nicholas C. Zakas 
 * 
 * Usage example: 
 * 
 *     eventUtil.addHandler(elm, "click", function (e) {
 *         e = eventUtil.getEvent(e);    // Get event object 
 *         eventUtil.preventDefault(e);  // Prevent default action
 *     });
 *
 */

(function (window) {

    'use strict';

    var eventUtil = {

        addHandler: function (element, type, handler) {
            if (element.addEventListener) { // W3C
                element.addEventListener(type, handler, false);
            } else if (element.attachEvent) { // IE
                element.attachEvent("on" + type, handler);
            } else {
                element["on" + type] = handler;
            }
        },

        removeHandler: function (element, type, handler) {
            if (element.removeEventListener) {
                element.removeEventListener(type, handler, false);
            } else if (element.detachEvent) {
                element.detachEvent("on" + type, handler);
            } else {
                element["on" + type] = null;
            }
        },

        // Get event element
        getEvent: function (e) {
            return e || window.event; // Dom event object || IE event object
        },

        // Get source element
        getTarget: function (e) {
            return e.target || e.srcElement; // Dom event object || IE event object
        },

        // Prevent default action
        preventDefault: function (e) {
            if (e.preventDefault) { // Dom event object
                e.preventDefault();
            } else { // IE event object
                e.returnValue = false;
            }
        },

        // Cancel event bubbling
        stopPropagation: function (e) {
            if (e.stopPropagation) { // Dom event object
                e.stopPropagation();
            } else { // IE event object
                e.cancelBubble = true;
            }
        }
    };

}(window));