event{} | JavaScript object | Cross Browser Event Handling

event.js

/**
 * Event
 * ------------------------------------------------------------------------
 * event{}
 * @version 1.0 | April 23rd 2013
 * @author  Beau Charman | @beaucharman | http://beaucharman.me
 * @link    https://gist.github.com/beaucharman/5127116
 * @method  add
 * @method  remove
 * @method  getTarget
 * @method  preventDefault
 *
 * Cross Browser Event Handling.
 * ------------------------------------------------------------------------ */
var event = {

  /**
   * Add
   * ------------------------------------------------------------------------
   * event.add()
   * @param {DOM node} el   | the target element
   * @param {string}   type | the type of event to list for
   * @param {function} fn   | the callback fucntion
   * ------------------------------------------------------------------------ */
  add : function(el, type, fn) {
    if ((el instanceof Array) || (el instanceof NodeList)) {
      for (var ii = 0, ln = el.length; ii < ln; ii++) {
        if (typeof addEventListener !== "undefined") {
          el[ii].addEventListener(type, fn, false);
        } else if (typeof attachEvent !== "undefined") {
          el[ii].attachEvent("on" + type, fn);
        } else {
          el[ii]["on" + type] = fn;
        }
      }
    } else {
      if (typeof addEventListener !== "undefined") {
        el.addEventListener(type, fn, false);
      } else if (typeof attachEvent !== "undefined") {
        el.attachEvent("on" + type, fn);
      } else {
        el["on" + type] = fn;
      }
    }
  },

  /**
   * Remove
   * ------------------------------------------------------------------------
   * event.remove()
   * @param {DOM node} el   | the target element
   * @param {string}   type | the type of event to list for
   * @param {function} fn   | the callback fucntion
   * ------------------------------------------------------------------------ */
  remove : function(el, type, fn) {
    if ((el instanceof Array) || (el instanceof NodeList)) {
      for (var ii = 0, ln = el.length; ii < ln; ii++) {
        if (typeof removeEventListener !== "undefined") {
          el[ii].removeEventListener(type, fn, false);
        } else if (typeof detachEvent !== "undefined") {
          el[ii].detachEvent("on" + type, fn);
        } else {
          el[ii]["on" + type] = null;
        }
      }
    } else {
      if (typeof removeEventListener !== "undefined") {
        el.removeEventListener(type, fn, false);
      } else if (typeof detachEvent !== "undefined") {
        el.detachEvent("on" + type, fn);
      } else {
        el["on" + type] = null;
      }
    }
  },

  /** Get Target
   * ------------------------------------------------------------------------
   * event.getTarget()
   * @param {event} e | the event instance
   * ------------------------------------------------------------------------ */
  getTarget : function(e) {
    if (typeof e.target !== "undefined") {
      return e.target;
    } else {
      return e.srcElement;
    }
  },

  /**
   * Prevent Default
   * ------------------------------------------------------------------------
   * event.preventDefault()
   * @param {event} e | the event instance
   * ------------------------------------------------------------------------ */
  preventDefault : function(e) {
    if(typeof e.preventDefault !== "undefined") {
      e.preventDefault();
    } else {
      e.returnValue = false;
    }
  }
};