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Event Utility  2.9.0

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/**
 * The Event Utility provides utilities for managing DOM Events and tools
 * for building event systems
 *
 * @module event
 * @title Event Utility
 * @namespace YAHOO.util
 * @requires yahoo
 */

// The first instance of Event will win if it is loaded more than once.
// @TODO this needs to be changed so that only the state data that needs to
// be preserved is kept, while methods are overwritten/added as needed.
// This means that the module pattern can't be used.
if (!YAHOO.util.Event) {

/**
 * The event utility provides functions to add and remove event listeners,
 * event cleansing.  It also tries to automatically remove listeners it
 * registers during the unload event.
 *
 * @class Event
 * @static
 */
    YAHOO.util.Event = function() {

        /**
         * True after the onload event has fired
         * @property loadComplete
         * @type boolean
         * @static
         * @private
         */
        var loadComplete =  false,

        /**
         * Cache of wrapped listeners
         * @property listeners
         * @type array
         * @static
         * @private
         */
        listeners = [],


        /**
         * User-defined unload function that will be fired before all events
         * are detached
         * @property unloadListeners
         * @type array
         * @static
         * @private
         */
        unloadListeners = [],

        /**
         * The number of times to poll after window.onload.  This number is
         * increased if additional late-bound handlers are requested after
         * the page load.
         * @property retryCount
         * @static
         * @private
         */
        retryCount = 0,

        /**
         * onAvailable listeners
         * @property onAvailStack
         * @static
         * @private
         */
        onAvailStack = [],

        /**
         * Counter for auto id generation
         * @property counter
         * @static
         * @private
         */
        counter = 0,

        /**
         * Normalized keycodes for webkit/safari
         * @property webkitKeymap
         * @type {int: int}
         * @private
         * @static
         * @final
         */
         webkitKeymap = {
            63232: 38, // up
            63233: 40, // down
            63234: 37, // left
            63235: 39, // right
            63276: 33, // page up
            63277: 34, // page down
            25: 9      // SHIFT-TAB (Safari provides a different key code in
                       // this case, even though the shiftKey modifier is set)
        },

        isIE = YAHOO.env.ua.ie,

        // String constants used by the addFocusListener and removeFocusListener methods

        FOCUSIN = "focusin",
        FOCUSOUT = "focusout";

        return {

            /**
             * The number of times we should look for elements that are not
             * in the DOM at the time the event is requested after the document
             * has been loaded.  The default is 500@amp;40 ms, so it will poll
             * for 20 seconds or until all outstanding handlers are bound
             * (whichever comes first).
             * @property POLL_RETRYS
             * @type int
             * @static
             * @final
             */
            POLL_RETRYS: 500,

            /**
             * The poll interval in milliseconds
             * @property POLL_INTERVAL
             * @type int
             * @static
             * @final
             */
            POLL_INTERVAL: 40,

            /**
             * Element to bind, int constant
             * @property EL
             * @type int
             * @static
             * @final
             */
            EL: 0,

            /**
             * Type of event, int constant
             * @property TYPE
             * @type int
             * @static
             * @final
             */
            TYPE: 1,

            /**
             * Function to execute, int constant
             * @property FN
             * @type int
             * @static
             * @final
             */
            FN: 2,

            /**
             * Function wrapped for context correction and cleanup, int constant
             * @property WFN
             * @type int
             * @static
             * @final
             */
            WFN: 3,

            /**
             * Object passed in by the user that will be returned as a
             * parameter to the callback, int constant.  Specific to
             * unload listeners
             * @property OBJ
             * @type int
             * @static
             * @final
             */
            UNLOAD_OBJ: 3,

            /**
             * Adjusted context, either the element we are registering the event
             * on or the custom object passed in by the listener, int constant
             * @property ADJ_SCOPE
             * @type int
             * @static
             * @final
             */
            ADJ_SCOPE: 4,

            /**
             * The original obj passed into addListener
             * @property OBJ
             * @type int
             * @static
             * @final
             */
            OBJ: 5,

            /**
             * The original context parameter passed into addListener
             * @property OVERRIDE
             * @type int
             * @static
             * @final
             */
            OVERRIDE: 6,

            /**
             * The original capture parameter passed into addListener
             * @property CAPTURE
             * @type int
             * @static
             * @final
             */
            CAPTURE: 7,

            /**
             * addListener/removeListener can throw errors in unexpected scenarios.
             * These errors are suppressed, the method returns false, and this property
             * is set
             * @property lastError
             * @static
             * @type Error
             */
            lastError: null,

            /**
             * Safari detection
             * @property isSafari
             * @private
             * @static
             * @deprecated use YAHOO.env.ua.webkit
             */
            isSafari: YAHOO.env.ua.webkit,

            /**
             * webkit version
             * @property webkit
             * @type string
             * @private
             * @static
             * @deprecated use YAHOO.env.ua.webkit
             */
            webkit: YAHOO.env.ua.webkit,

            /**
             * IE detection
             * @property isIE
             * @private
             * @static
             * @deprecated use YAHOO.env.ua.ie
             */
            isIE: isIE,

            /**
             * poll handle
             * @property _interval
             * @static
             * @private
             */
            _interval: null,

            /**
             * document readystate poll handle
             * @property _dri
             * @static
             * @private
             */
             _dri: null,


            /**
             * Map of special event types
             * @property _specialTypes
             * @static
             * @private
             */
            _specialTypes: {
                focusin: (isIE ? "focusin" : "focus"),
                focusout: (isIE ? "focusout" : "blur")
            },


            /**
             * True when the document is initially usable
             * @property DOMReady
             * @type boolean
             * @static
             */
            DOMReady: false,

            /**
             * Errors thrown by subscribers of custom events are caught
             * and the error message is written to the debug console.  If
             * this property is set to true, it will also re-throw the
             * error.
             * @property throwErrors
             * @type boolean
             * @default false
             */
            throwErrors: false,


            /**
             * @method startInterval
             * @static
             * @private
             */
            startInterval: function() {
                if (!this._interval) {
                    // var self = this;
                    // var callback = function() { self._tryPreloadAttach(); };
                    // this._interval = setInterval(callback, this.POLL_INTERVAL);
                    this._interval = YAHOO.lang.later(this.POLL_INTERVAL, this, this._tryPreloadAttach, null, true);
                }
            },

            /**
             * Executes the supplied callback when the item with the supplied
             * id is found.  This is meant to be used to execute behavior as
             * soon as possible as the page loads.  If you use this after the
             * initial page load it will poll for a fixed time for the element.
             * The number of times it will poll and the frequency are
             * configurable.  By default it will poll for 10 seconds.
             *
             * <p>The callback is executed with a single parameter:
             * the custom object parameter, if provided.</p>
             *
             * @method onAvailable
             *
             * @param {string||string[]}   id the id of the element, or an array
             * of ids to look for.
             * @param {function} fn what to execute when the element is found.
             * @param {object}   obj an optional object to be passed back as
             *                   a parameter to fn.
             * @param {boolean|object}  overrideContext If set to true, fn will execute
             *                   in the context of obj, if set to an object it
             *                   will execute in the context of that object
             * @param checkContent {boolean} check child node readiness (onContentReady)
             * @static
             */
            onAvailable: function(id, fn, obj, overrideContext, checkContent) {

                var a = (YAHOO.lang.isString(id)) ? [id] : id;

                for (var i=0; i<a.length; i=i+1) {
                    onAvailStack.push({id:         a[i],
                                       fn:         fn,
                                       obj:        obj,
                                       overrideContext:   overrideContext,
                                       checkReady: checkContent });
                }

                retryCount = this.POLL_RETRYS;

                this.startInterval();
            },

            /**
             * Works the same way as onAvailable, but additionally checks the
             * state of sibling elements to determine if the content of the
             * available element is safe to modify.
             *
             * <p>The callback is executed with a single parameter:
             * the custom object parameter, if provided.</p>
             *
             * @method onContentReady
             *
             * @param {string}   id the id of the element to look for.
             * @param {function} fn what to execute when the element is ready.
             * @param {object}   obj an optional object to be passed back as
             *                   a parameter to fn.
             * @param {boolean|object}  overrideContext If set to true, fn will execute
             *                   in the context of obj.  If an object, fn will
             *                   exectute in the context of that object
             *
             * @static
             */
            onContentReady: function(id, fn, obj, overrideContext) {
                this.onAvailable(id, fn, obj, overrideContext, true);
            },

            /**
             * Executes the supplied callback when the DOM is first usable.  This
             * will execute immediately if called after the DOMReady event has
             * fired.   @todo the DOMContentReady event does not fire when the
             * script is dynamically injected into the page.  This means the
             * DOMReady custom event will never fire in FireFox or Opera when the
             * library is injected.  It _will_ fire in Safari, and the IE
             * implementation would allow for us to fire it if the defered script
             * is not available.  We want this to behave the same in all browsers.
             * Is there a way to identify when the script has been injected
             * instead of included inline?  Is there a way to know whether the
             * window onload event has fired without having had a listener attached
             * to it when it did so?
             *
             * <p>The callback is a CustomEvent, so the signature is:</p>
             * <p>type &lt;string&gt;, args &lt;array&gt;, customobject &lt;object&gt;</p>
             * <p>For DOMReady events, there are no fire argments, so the
             * signature is:</p>
             * <p>"DOMReady", [], obj</p>
             *
             *
             * @method onDOMReady
             *
             * @param {function} fn what to execute when the element is found.
             * @param {object}   obj an optional object to be passed back as
             *                   a parameter to fn.
             * @param {boolean|object}  overrideContext If set to true, fn will execute
             *                   in the context of obj, if set to an object it
             *                   will execute in the context of that object
             *
             * @static
             */
            // onDOMReady: function(fn, obj, overrideContext) {
            onDOMReady: function() {
                this.DOMReadyEvent.subscribe.apply(this.DOMReadyEvent, arguments);
            },


            /**
             * Appends an event handler
             *
             * @method _addListener
             *
             * @param {String|HTMLElement|Array|NodeList} el An id, an element
             *  reference, or a collection of ids and/or elements to assign the
             *  listener to.
             * @param {String}   sType     The type of event to append
             * @param {Function} fn        The method the event invokes
             * @param {Object}   obj    An arbitrary object that will be
             *                             passed as a parameter to the handler
             * @param {Boolean|object}  overrideContext  If true, the obj passed in becomes
             *                             the execution context of the listener. If an
             *                             object, this object becomes the execution
             *                             context.
             * @param {boolen}      capture capture or bubble phase
             * @return {Boolean} True if the action was successful or defered,
             *                        false if one or more of the elements
             *                        could not have the listener attached,
             *                        or if the operation throws an exception.
             * @private
             * @static
             */
            _addListener: function(el, sType, fn, obj, overrideContext, bCapture) {

                if (!fn || !fn.call) {
                    YAHOO.log(sType + " addListener failed, invalid callback", "error", "Event");
                    return false;
                }

                // The el argument can be an array of elements or element ids.
                if ( this._isValidCollection(el)) {
                    var ok = true;
                    for (var i=0,len=el.length; i<len; ++i) {
                        ok = this.on(el[i],
                                       sType,
                                       fn,
                                       obj,
                                       overrideContext) && ok;
                    }
                    return ok;

                } else if (YAHOO.lang.isString(el)) {
                    var oEl = this.getEl(el);
                    // If the el argument is a string, we assume it is
                    // actually the id of the element.  If the page is loaded
                    // we convert el to the actual element, otherwise we
                    // defer attaching the event until onload event fires

                    // check to see if we need to delay hooking up the event
                    // until after the page loads.
                    if (oEl) {
                        el = oEl;
                    } else {
                        // defer adding the event until the element is available
                        this.onAvailable(el, function() {
                           YAHOO.util.Event._addListener(el, sType, fn, obj, overrideContext, bCapture);
                        });

                        return true;
                    }
                }

                // Element should be an html element or an array if we get
                // here.
                if (!el) {
                    // this.logger.debug("unable to attach event " + sType);
                    return false;
                }

                // we need to make sure we fire registered unload events
                // prior to automatically unhooking them.  So we hang on to
                // these instead of attaching them to the window and fire the
                // handles explicitly during our one unload event.
                if ("unload" == sType && obj !== this) {
                    unloadListeners[unloadListeners.length] =
                            [el, sType, fn, obj, overrideContext];
                    return true;
                }

                // this.logger.debug("Adding handler: " + el + ", " + sType);

                // if the user chooses to override the context, we use the custom
                // object passed in, otherwise the executing context will be the
                // HTML element that the event is registered on
                var context = el;
                if (overrideContext) {
                    if (overrideContext === true) {
                        context = obj;
                    } else {
                        context = overrideContext;
                    }
                }

                // wrap the function so we can return the obj object when
                // the event fires;
                var wrappedFn = function(e) {
                        return fn.call(context, YAHOO.util.Event.getEvent(e, el),
                                obj);
                    };

                var li = [el, sType, fn, wrappedFn, context, obj, overrideContext, bCapture];
                var index = listeners.length;
                // cache the listener so we can try to automatically unload
                listeners[index] = li;

                try {
                    this._simpleAdd(el, sType, wrappedFn, bCapture);
                } catch(ex) {
                    // handle an error trying to attach an event.  If it fails
                    // we need to clean up the cache
                    this.lastError = ex;
                    this.removeListener(el, sType, fn);
                    return false;
                }

                return true;

            },

            /**
             * Checks to see if the type requested is a special type
             * (as defined by the _specialTypes hash), and (if so) returns
             * the special type name.
             *
             * @method _getType
             *
             * @param {String}   sType     The type to look up
             * @private
             */
            _getType: function (type) {

                return this._specialTypes[type] || type;

            },


            /**
             * Appends an event handler
             *
             * @method addListener
             *
             * @param {String|HTMLElement|Array|NodeList} el An id, an element
             *  reference, or a collection of ids and/or elements to assign the
             *  listener to.
             * @param {String}   sType     The type of event to append
             * @param {Function} fn        The method the event invokes
             * @param {Object}   obj    An arbitrary object that will be
             *                             passed as a parameter to the handler
             * @param {Boolean|object}  overrideContext  If true, the obj passed in becomes
             *                             the execution context of the listener. If an
             *                             object, this object becomes the execution
             *                             context.
             * @return {Boolean} True if the action was successful or defered,
             *                        false if one or more of the elements
             *                        could not have the listener attached,
             *                        or if the operation throws an exception.
             * @static
             */
            addListener: function (el, sType, fn, obj, overrideContext) {

                var capture = ((sType == FOCUSIN || sType == FOCUSOUT) && !YAHOO.env.ua.ie) ? true : false;

                return this._addListener(el, this._getType(sType), fn, obj, overrideContext, capture);

            },


            /**
             * Attaches a focusin event listener to the specified element for
             * the purpose of listening for the focus event on the element's
             * descendants.
             * @method addFocusListener
             *
             * @param {String|HTMLElement|Array|NodeList} el An id, an element
             *  reference, or a collection of ids and/or elements to assign the
             *  listener to.
             * @param {Function} fn        The method the event invokes
             * @param {Object}   obj    An arbitrary object that will be
             *                             passed as a parameter to the handler
             * @param {Boolean|object}  overrideContext  If true, the obj passed in becomes
             *                             the execution context of the listener. If an
             *                             object, this object becomes the execution
             *                             context.
             * @return {Boolean} True if the action was successful or defered,
             *                        false if one or more of the elements
             *                        could not have the listener attached,
             *                        or if the operation throws an exception.
             * @static
            * @deprecated use YAHOO.util.Event.on and specify "focusin" as the event type.
             */
            addFocusListener: function (el, fn, obj, overrideContext) {
                return this.on(el, FOCUSIN, fn, obj, overrideContext);
            },


            /**
             * Removes a focusin event listener to the specified element for
             * the purpose of listening for the focus event on the element's
             * descendants.
             *
             * @method removeFocusListener
             *
             * @param {String|HTMLElement|Array|NodeList} el An id, an element
             *  reference, or a collection of ids and/or elements to remove
             *  the listener from.
             * @param {Function} fn the method the event invokes.  If fn is
             *  undefined, then all event handlers for the type of event are
             *  removed.
             * @return {boolean} true if the unbind was successful, false
             *  otherwise.
             * @static
             * @deprecated use YAHOO.util.Event.removeListener and specify "focusin" as the event type.
             */
            removeFocusListener: function (el, fn) {
                return this.removeListener(el, FOCUSIN, fn);
            },

            /**
             * Attaches a focusout event listener to the specified element for
             * the purpose of listening for the blur event on the element's
             * descendants.
             *
             * @method addBlurListener
             *
             * @param {String|HTMLElement|Array|NodeList} el An id, an element
             *  reference, or a collection of ids and/or elements to assign the
             *  listener to.
             * @param {Function} fn        The method the event invokes
             * @param {Object}   obj    An arbitrary object that will be
             *                             passed as a parameter to the handler
             * @param {Boolean|object}  overrideContext  If true, the obj passed in becomes
             *                             the execution context of the listener. If an
             *                             object, this object becomes the execution
             *                             context.
             * @return {Boolean} True if the action was successful or defered,
             *                        false if one or more of the elements
             *                        could not have the listener attached,
             *                        or if the operation throws an exception.
             * @static
             * @deprecated use YAHOO.util.Event.on and specify "focusout" as the event type.
             */
            addBlurListener: function (el, fn, obj, overrideContext) {
                return this.on(el, FOCUSOUT, fn, obj, overrideContext);
            },

            /**
             * Removes a focusout event listener to the specified element for
             * the purpose of listening for the blur event on the element's
             * descendants.
             *
             * @method removeBlurListener
             *
             * @param {String|HTMLElement|Array|NodeList} el An id, an element
             *  reference, or a collection of ids and/or elements to remove
             *  the listener from.
             * @param {Function} fn the method the event invokes.  If fn is
             *  undefined, then all event handlers for the type of event are
             *  removed.
             * @return {boolean} true if the unbind was successful, false
             *  otherwise.
             * @static
             * @deprecated use YAHOO.util.Event.removeListener and specify "focusout" as the event type.
             */
            removeBlurListener: function (el, fn) {
                return this.removeListener(el, FOCUSOUT, fn);
            },

            /**
             * Removes an event listener
             *
             * @method removeListener
             *
             * @param {String|HTMLElement|Array|NodeList} el An id, an element
             *  reference, or a collection of ids and/or elements to remove
             *  the listener from.
             * @param {String} sType the type of event to remove.
             * @param {Function} fn the method the event invokes.  If fn is
             *  undefined, then all event handlers for the type of event are
             *  removed.
             * @return {boolean} true if the unbind was successful, false
             *  otherwise.
             * @static
             */
            removeListener: function(el, sType, fn) {
                var i, len, li;

                sType = this._getType(sType);

                // The el argument can be a string
                if (typeof el == "string") {
                    el = this.getEl(el);
                // The el argument can be an array of elements or element ids.
                } else if ( this._isValidCollection(el)) {
                    var ok = true;
                    for (i=el.length-1; i>-1; i--) {
                        ok = ( this.removeListener(el[i], sType, fn) && ok );
                    }
                    return ok;
                }

                if (!fn || !fn.call) {
                    // this.logger.debug("Error, function is not valid " + fn);
                    //return false;
                    return this.purgeElement(el, false, sType);
                }

                if ("unload" == sType) {

                    for (i=unloadListeners.length-1; i>-1; i--) {
                        li = unloadListeners[i];
                        if (li &&
                            li[0] == el &&
                            li[1] == sType &&
                            li[2] == fn) {
                                unloadListeners.splice(i, 1);
                                // unloadListeners[i]=null;
                                return true;
                        }
                    }

                    return false;
                }

                var cacheItem = null;

                // The index is a hidden parameter; needed to remove it from
                // the method signature because it was tempting users to
                // try and take advantage of it, which is not possible.
                var index = arguments[3];

                if ("undefined" === typeof index) {
                    index = this._getCacheIndex(listeners, el, sType, fn);
                }

                if (index >= 0) {
                    cacheItem = listeners[index];
                }

                if (!el || !cacheItem) {
                    // this.logger.debug("cached listener not found");
                    return false;
                }

                // this.logger.debug("Removing handler: " + el + ", " + sType);

                var bCapture = cacheItem[this.CAPTURE] === true ? true : false;

                try {
                    this._simpleRemove(el, sType, cacheItem[this.WFN], bCapture);
                } catch(ex) {
                    this.lastError = ex;
                    return false;
                }

                // removed the wrapped handler
                delete listeners[index][this.WFN];
                delete listeners[index][this.FN];
                listeners.splice(index, 1);
                // listeners[index]=null;

                return true;

            },

            /**
             * Returns the event's target element.  Safari sometimes provides
             * a text node, and this is automatically resolved to the text
             * node's parent so that it behaves like other browsers.
             * @method getTarget
             * @param {Event} ev the event
             * @param {boolean} resolveTextNode when set to true the target's
             *                  parent will be returned if the target is a
             *                  text node.  @deprecated, the text node is
             *                  now resolved automatically
             * @return {HTMLElement} the event's target
             * @static
             */
            getTarget: function(ev, resolveTextNode) {
                var t = ev.target || ev.srcElement;
                return this.resolveTextNode(t);
            },

            /**
             * In some cases, some browsers will return a text node inside
             * the actual element that was targeted.  This normalizes the
             * return value for getTarget and getRelatedTarget.
             *
             * If accessing a property of the node throws an error, this is
             * probably the anonymous div wrapper Gecko adds inside text
             * nodes.  This likely will only occur when attempting to access
             * the relatedTarget.  In this case, we now return null because
             * the anonymous div is completely useless and we do not know
             * what the related target was because we can't even get to
             * the element's parent node.
             *
             * @method resolveTextNode
             * @param {HTMLElement} node node to resolve
             * @return {HTMLElement} the normized node
             * @static
             */
            resolveTextNode: function(n) {
                try {
                    if (n && 3 == n.nodeType) {
                        return n.parentNode;
                    }
                } catch(e) {
                    return null;
                }

                return n;
            },

            /**
             * Returns the event's pageX
             * @method getPageX
             * @param {Event} ev the event
             * @return {int} the event's pageX
             * @static
             */
            getPageX: function(ev) {
                var x = ev.pageX;
                if (!x && 0 !== x) {
                    x = ev.clientX || 0;

                    if ( this.isIE ) {
                        x += this._getScrollLeft();
                    }
                }

                return x;
            },

            /**
             * Returns the event's pageY
             * @method getPageY
             * @param {Event} ev the event
             * @return {int} the event's pageY
             * @static
             */
            getPageY: function(ev) {
                var y = ev.pageY;
                if (!y && 0 !== y) {
                    y = ev.clientY || 0;

                    if ( this.isIE ) {
                        y += this._getScrollTop();
                    }
                }


                return y;
            },

            /**
             * Returns the pageX and pageY properties as an indexed array.
             * @method getXY
             * @param {Event} ev the event
             * @return {[x, y]} the pageX and pageY properties of the event
             * @static
             */
            getXY: function(ev) {
                return [this.getPageX(ev), this.getPageY(ev)];
            },

            /**
             * Returns the event's related target
             * @method getRelatedTarget
             * @param {Event} ev the event
             * @return {HTMLElement} the event's relatedTarget
             * @static
             */
            getRelatedTarget: function(ev) {
                var t = ev.relatedTarget;
                if (!t) {
                    if (ev.type == "mouseout") {
                        t = ev.toElement;
                    } else if (ev.type == "mouseover") {
                        t = ev.fromElement;
                    }
                }

                return this.resolveTextNode(t);
            },

            /**
             * Returns the time of the event.  If the time is not included, the
             * event is modified using the current time.
             * @method getTime
             * @param {Event} ev the event
             * @return {Date} the time of the event
             * @static
             */
            getTime: function(ev) {
                if (!ev.time) {
                    var t = new Date().getTime();
                    try {
                        ev.time = t;
                    } catch(ex) {
                        this.lastError = ex;
                        return t;
                    }
                }

                return ev.time;
            },

            /**
             * Convenience method for stopPropagation + preventDefault
             * @method stopEvent
             * @param {Event} ev the event
             * @static
             */
            stopEvent: function(ev) {
                this.stopPropagation(ev);
                this.preventDefault(ev);
            },

            /**
             * Stops event propagation
             * @method stopPropagation
             * @param {Event} ev the event
             * @static
             */
            stopPropagation: function(ev) {
                if (ev.stopPropagation) {
                    ev.stopPropagation();
                } else {
                    ev.cancelBubble = true;
                }
            },

            /**
             * Prevents the default behavior of the event
             * @method preventDefault
             * @param {Event} ev the event
             * @static
             */
            preventDefault: function(ev) {
                if (ev.preventDefault) {
                    ev.preventDefault();
                } else {
                    ev.returnValue = false;
                }
            },

            /**
             * Finds the event in the window object, the caller's arguments, or
             * in the arguments of another method in the callstack.  This is
             * executed automatically for events registered through the event
             * manager, so the implementer should not normally need to execute
             * this function at all.
             * @method getEvent
             * @param {Event} e the event parameter from the handler
             * @param {HTMLElement} boundEl the element the listener is attached to
             * @return {Event} the event
             * @static
             */
            getEvent: function(e, boundEl) {
                var ev = e || window.event;

                if (!ev) {
                    var c = this.getEvent.caller;
                    while (c) {
                        ev = c.arguments[0];
                        if (ev && Event == ev.constructor) {
                            break;
                        }
                        c = c.caller;
                    }
                }

                return ev;
            },

            /**
             * Returns the charcode for an event
             * @method getCharCode
             * @param {Event} ev the event
             * @return {int} the event's charCode
             * @static
             */
            getCharCode: function(ev) {
                var code = ev.keyCode || ev.charCode || 0;

                // webkit key normalization
                if (YAHOO.env.ua.webkit && (code in webkitKeymap)) {
                    code = webkitKeymap[code];
                }
                return code;
            },

            /**
             * Locating the saved event handler data by function ref
             *
             * @method _getCacheIndex
             * @static
             * @private
             */
            _getCacheIndex: function(a, el, sType, fn) {
                for (var i=0, l=a.length; i<l; i=i+1) {
                    var li = a[i];
                    if ( li                 &&
                         li[this.FN] == fn  &&
                         li[this.EL] == el  &&
                         li[this.TYPE] == sType ) {
                        return i;
                    }
                }

                return -1;
            },

            /**
             * Generates an unique ID for the element if it does not already
             * have one.
             * @method generateId
             * @param el the element to create the id for
             * @return {string} the resulting id of the element
             * @static
             */
            generateId: function(el) {
                var id = el.id;

                if (!id) {
                    id = "yuievtautoid-" + counter;
                    ++counter;
                    el.id = id;
                }

                return id;
            },


            /**
             * We want to be able to use getElementsByTagName as a collection
             * to attach a group of events to.  Unfortunately, different
             * browsers return different types of collections.  This function
             * tests to determine if the object is array-like.  It will also
             * fail if the object is an array, but is empty.
             * @method _isValidCollection
             * @param o the object to test
             * @return {boolean} true if the object is array-like and populated
             * @static
             * @private
             */
            _isValidCollection: function(o) {
                try {
                    return ( o                     && // o is something
                             typeof o !== "string" && // o is not a string
                             o.length              && // o is indexed
                             !o.tagName            && // o is not an HTML element
                             !o.alert              && // o is not a window
                             typeof o[0] !== "undefined" );
                } catch(ex) {
                    YAHOO.log("node access error (xframe?)", "warn");
                    return false;
                }

            },

            /**
             * @private
             * @property elCache
             * DOM element cache
             * @static
             * @deprecated Elements are not cached due to issues that arise when
             * elements are removed and re-added
             */
            elCache: {},

            /**
             * We cache elements bound by id because when the unload event
             * fires, we can no longer use document.getElementById
             * @method getEl
             * @static
             * @private
             * @deprecated Elements are not cached any longer
             */
            getEl: function(id) {
                return (typeof id === "string") ? document.getElementById(id) : id;
            },

            /**
             * Clears the element cache
             * @deprecated Elements are not cached any longer
             * @method clearCache
             * @static
             * @private
             */
            clearCache: function() { },

            /**
             * Custom event the fires when the dom is initially usable
             * @event DOMReadyEvent
             */
            DOMReadyEvent: new YAHOO.util.CustomEvent("DOMReady", YAHOO, 0, 0, 1),

            /**
             * hook up any deferred listeners
             * @method _load
             * @static
             * @private
             */
            _load: function(e) {

                if (!loadComplete) {
                    loadComplete = true;
                    var EU = YAHOO.util.Event;

                    // Just in case DOMReady did not go off for some reason
                    EU._ready();

                    // Available elements may not have been detected before the
                    // window load event fires. Try to find them now so that the
                    // the user is more likely to get the onAvailable notifications
                    // before the window load notification
                    EU._tryPreloadAttach();

                }
            },

            /**
             * Fires the DOMReady event listeners the first time the document is
             * usable.
             * @method _ready
             * @static
             * @private
             */
            _ready: function(e) {
                var EU = YAHOO.util.Event;
                if (!EU.DOMReady) {
                    EU.DOMReady=true;

                    // Fire the content ready custom event
                    EU.DOMReadyEvent.fire();

                    // Remove the DOMContentLoaded (FF/Opera)
                    EU._simpleRemove(document, "DOMContentLoaded", EU._ready);
                }
            },

            /**
             * Polling function that runs before the onload event fires,
             * attempting to attach to DOM Nodes as soon as they are
             * available
             * @method _tryPreloadAttach
             * @static
             * @private
             */
            _tryPreloadAttach: function() {

                if (onAvailStack.length === 0) {
                    retryCount = 0;
                    if (this._interval) {
                        // clearInterval(this._interval);
                        this._interval.cancel();
                        this._interval = null;
                    }
                    return;
                }

                if (this.locked) {
                    return;
                }

                if (this.isIE) {
                    // Hold off if DOMReady has not fired and check current
                    // readyState to protect against the IE operation aborted
                    // issue.
                    if (!this.DOMReady) {
                        this.startInterval();
                        return;
                    }
                }

                this.locked = true;

                // this.logger.debug("tryPreloadAttach");

                // keep trying until after the page is loaded.  We need to
                // check the page load state prior to trying to bind the
                // elements so that we can be certain all elements have been
                // tested appropriately
                var tryAgain = !loadComplete;
                if (!tryAgain) {
                    tryAgain = (retryCount > 0 && onAvailStack.length > 0);
                }

                // onAvailable
                var notAvail = [];

                var executeItem = function (el, item) {
                    var context = el;
                    if (item.overrideContext) {
                        if (item.overrideContext === true) {
                            context = item.obj;
                        } else {
                            context = item.overrideContext;
                        }
                    }
                    item.fn.call(context, item.obj);
                };

                var i, len, item, el, ready=[];

                // onAvailable onContentReady
                for (i=0, len=onAvailStack.length; i<len; i=i+1) {
                    item = onAvailStack[i];
                    if (item) {
                        el = this.getEl(item.id);
                        if (el) {
                            if (item.checkReady) {
                                if (loadComplete || el.nextSibling || !tryAgain) {
                                    ready.push(item);
                                    onAvailStack[i] = null;
                                }
                            } else {
                                executeItem(el, item);
                                onAvailStack[i] = null;
                            }
                        } else {
                            notAvail.push(item);
                        }
                    }
                }

                // make sure onContentReady fires after onAvailable
                for (i=0, len=ready.length; i<len; i=i+1) {
                    item = ready[i];
                    executeItem(this.getEl(item.id), item);
                }


                retryCount--;

                if (tryAgain) {
                    for (i=onAvailStack.length-1; i>-1; i--) {
                        item = onAvailStack[i];
                        if (!item || !item.id) {
                            onAvailStack.splice(i, 1);
                        }
                    }

                    this.startInterval();
                } else {
                    if (this._interval) {
                        // clearInterval(this._interval);
                        this._interval.cancel();
                        this._interval = null;
                    }
                }

                this.locked = false;

            },

            /**
             * Removes all listeners attached to the given element via addListener.
             * Optionally, the node's children can also be purged.
             * Optionally, you can specify a specific type of event to remove.
             * @method purgeElement
             * @param {HTMLElement} el the element to purge
             * @param {boolean} recurse recursively purge this element's children
             * as well.  Use with caution.
             * @param {string} sType optional type of listener to purge. If
             * left out, all listeners will be removed
             * @static
             */
            purgeElement: function(el, recurse, sType) {
                var oEl = (YAHOO.lang.isString(el)) ? this.getEl(el) : el;
                var elListeners = this.getListeners(oEl, sType), i, len;
                if (elListeners) {
                    for (i=elListeners.length-1; i>-1; i--) {
                        var l = elListeners[i];
                        this.removeListener(oEl, l.type, l.fn);
                    }
                }

                if (recurse && oEl && oEl.childNodes) {
                    for (i=0,len=oEl.childNodes.length; i<len ; ++i) {
                        this.purgeElement(oEl.childNodes[i], recurse, sType);
                    }
                }
            },

            /**
             * Returns all listeners attached to the given element via addListener.
             * Optionally, you can specify a specific type of event to return.
             * @method getListeners
             * @param el {HTMLElement|string} the element or element id to inspect
             * @param sType {string} optional type of listener to return. If
             * left out, all listeners will be returned
             * @return {Object} the listener. Contains the following fields:
             * &nbsp;&nbsp;type:   (string)   the type of event
             * &nbsp;&nbsp;fn:     (function) the callback supplied to addListener
             * &nbsp;&nbsp;obj:    (object)   the custom object supplied to addListener
             * &nbsp;&nbsp;adjust: (boolean|object)  whether or not to adjust the default context
             * &nbsp;&nbsp;scope: (boolean)  the derived context based on the adjust parameter
             * &nbsp;&nbsp;index:  (int)      its position in the Event util listener cache
             * @static
             */
            getListeners: function(el, sType) {
                var results=[], searchLists;
                if (!sType) {
                    searchLists = [listeners, unloadListeners];
                } else if (sType === "unload") {
                    searchLists = [unloadListeners];
                } else {
                    sType = this._getType(sType);
                    searchLists = [listeners];
                }

                var oEl = (YAHOO.lang.isString(el)) ? this.getEl(el) : el;

                for (var j=0;j<searchLists.length; j=j+1) {
                    var searchList = searchLists[j];
                    if (searchList) {
                        for (var i=0,len=searchList.length; i<len ; ++i) {
                            var l = searchList[i];
                            if ( l  && l[this.EL] === oEl &&
                                    (!sType || sType === l[this.TYPE]) ) {
                                results.push({
                                    type:   l[this.TYPE],
                                    fn:     l[this.FN],
                                    obj:    l[this.OBJ],
                                    adjust: l[this.OVERRIDE],
                                    scope:  l[this.ADJ_SCOPE],
                                    index:  i
                                });
                            }
                        }
                    }
                }

                return (results.length) ? results : null;
            },

            /**
             * Removes all listeners registered by pe.event.  Called
             * automatically during the unload event.
             * @method _unload
             * @static
             * @private
             */
            _unload: function(e) {

                var EU = YAHOO.util.Event, i, j, l, len, index,
                         ul = unloadListeners.slice(), context;

                // execute and clear stored unload listeners
                for (i=0, len=unloadListeners.length; i<len; ++i) {
                    l = ul[i];
                    if (l) {
                        try {
                            context = window;
                            if (l[EU.ADJ_SCOPE]) {
                                if (l[EU.ADJ_SCOPE] === true) {
                                    context = l[EU.UNLOAD_OBJ];
                                } else {
                                    context = l[EU.ADJ_SCOPE];
                                }
                            }
                            l[EU.FN].call(context, EU.getEvent(e, l[EU.EL]), l[EU.UNLOAD_OBJ] );
                        } catch(e1) {}
                        ul[i] = null;
                    }
                }

                l = null;
                context = null;
                unloadListeners = null;

                // Remove listeners to handle IE memory leaks
                // 2.5.0 listeners are removed for all browsers again.  FireFox preserves
                // at least some listeners between page refreshes, potentially causing
                // errors during page load (mouseover listeners firing before they
                // should if the user moves the mouse at the correct moment).
                if (listeners) {
                    for (j=listeners.length-1; j>-1; j--) {
                        l = listeners[j];
                        if (l) {
                            try {
                                EU.removeListener(l[EU.EL], l[EU.TYPE], l[EU.FN], j);
                            } catch(e2) {}
                        }
                    }
                    l=null;
                }

                try {
                    EU._simpleRemove(window, "unload", EU._unload);
                    EU._simpleRemove(window, "load", EU._load);
                } catch(e3) {}

            },

            /**
             * Returns scrollLeft
             * @method _getScrollLeft
             * @static
             * @private
             */
            _getScrollLeft: function() {
                return this._getScroll()[1];
            },

            /**
             * Returns scrollTop
             * @method _getScrollTop
             * @static
             * @private
             */
            _getScrollTop: function() {
                return this._getScroll()[0];
            },

            /**
             * Returns the scrollTop and scrollLeft.  Used to calculate the
             * pageX and pageY in Internet Explorer
             * @method _getScroll
             * @static
             * @private
             */
            _getScroll: function() {
                var dd = document.documentElement, db = document.body;
                if (dd && (dd.scrollTop || dd.scrollLeft)) {
                    return [dd.scrollTop, dd.scrollLeft];
                } else if (db) {
                    return [db.scrollTop, db.scrollLeft];
                } else {
                    return [0, 0];
                }
            },

            /**
             * Used by old versions of CustomEvent, restored for backwards
             * compatibility
             * @method regCE
             * @private
             * @static
             * @deprecated still here for backwards compatibility
             */
            regCE: function() {},

            /**
             * Adds a DOM event directly without the caching, cleanup, context adj, etc
             *
             * @method _simpleAdd
             * @param {HTMLElement} el      the element to bind the handler to
             * @param {string}      sType   the type of event handler
             * @param {function}    fn      the callback to invoke
             * @param {boolen}      capture capture or bubble phase
             * @static
             * @private
             */
            _simpleAdd: function () {
                if (window.addEventListener) {
                    return function(el, sType, fn, capture) {
                        el.addEventListener(sType, fn, (capture));
                    };
                } else if (window.attachEvent) {
                    return function(el, sType, fn, capture) {
                        el.attachEvent("on" + sType, fn);
                    };
                } else {
                    return function(){};
                }
            }(),

            /**
             * Basic remove listener
             *
             * @method _simpleRemove
             * @param {HTMLElement} el      the element to bind the handler to
             * @param {string}      sType   the type of event handler
             * @param {function}    fn      the callback to invoke
             * @param {boolen}      capture capture or bubble phase
             * @static
             * @private
             */
            _simpleRemove: function() {
                if (window.removeEventListener) {
                    return function (el, sType, fn, capture) {
                        el.removeEventListener(sType, fn, (capture));
                    };
                } else if (window.detachEvent) {
                    return function (el, sType, fn) {
                        el.detachEvent("on" + sType, fn);
                    };
                } else {
                    return function(){};
                }
            }()
        };

    }();

    (function() {
        var EU = YAHOO.util.Event;

        /**
         * Appends an event handler.  This is an alias for <code>addListener</code>
         *
         * @method on
         *
         * @param {String|HTMLElement|Array|NodeList} el An id, an element
         *  reference, or a collection of ids and/or elements to assign the
         *  listener to.
         * @param {String}   sType     The type of event to append
         * @param {Function} fn        The method the event invokes
         * @param {Object}   obj    An arbitrary object that will be
         *                             passed as a parameter to the handler
         * @param {Boolean|object}  overrideContext  If true, the obj passed in becomes
         *                             the execution context of the listener. If an
         *                             object, this object becomes the execution
         *                             context.
         * @return {Boolean} True if the action was successful or defered,
         *                        false if one or more of the elements
         *                        could not have the listener attached,
         *                        or if the operation throws an exception.
         * @static
         */
        EU.on = EU.addListener;

        /**
         * YAHOO.util.Event.onFocus is an alias for addFocusListener
         * @method onFocus
         * @see addFocusListener
         * @static
         * @deprecated use YAHOO.util.Event.on and specify "focusin" as the event type.
         */
        EU.onFocus = EU.addFocusListener;

        /**
         * YAHOO.util.Event.onBlur is an alias for addBlurListener
         * @method onBlur
         * @see addBlurListener
         * @static
         * @deprecated use YAHOO.util.Event.on and specify "focusout" as the event type.
         */
        EU.onBlur = EU.addBlurListener;

/*! DOMReady: based on work by: Dean Edwards/John Resig/Matthias Miller/Diego Perini */

        // Internet Explorer: use the readyState of a defered script.
        // This isolates what appears to be a safe moment to manipulate
        // the DOM prior to when the document's readyState suggests
        // it is safe to do so.
        if (EU.isIE) {
            if (self !== self.top) {
                document.onreadystatechange = function() {
                    if (document.readyState == 'complete') {
                        document.onreadystatechange = null;
                        EU._ready();
                    }
                };
            } else {

                // Process onAvailable/onContentReady items when the
                // DOM is ready.
                YAHOO.util.Event.onDOMReady(
                        YAHOO.util.Event._tryPreloadAttach,
                        YAHOO.util.Event, true);

                var n = document.createElement('p');

                EU._dri = setInterval(function() {
                    try {
                        // throws an error if doc is not ready
                        n.doScroll('left');
                        clearInterval(EU._dri);
                        EU._dri = null;
                        EU._ready();
                        n = null;
                    } catch (ex) {
                    }
                }, EU.POLL_INTERVAL);
            }

        // The document's readyState in Safari currently will
        // change to loaded/complete before images are loaded.
        } else if (EU.webkit && EU.webkit < 525) {

            EU._dri = setInterval(function() {
                var rs=document.readyState;
                if ("loaded" == rs || "complete" == rs) {
                    clearInterval(EU._dri);
                    EU._dri = null;
                    EU._ready();
                }
            }, EU.POLL_INTERVAL);

        // FireFox and Opera: These browsers provide a event for this
        // moment.  The latest WebKit releases now support this event.
        } else {

            EU._simpleAdd(document, "DOMContentLoaded", EU._ready);

        }
        /////////////////////////////////////////////////////////////


        EU._simpleAdd(window, "load", EU._load);
        EU._simpleAdd(window, "unload", EU._unload);
        EU._tryPreloadAttach();
    })();

}

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