Quelle yui-event.js Sprache: JAVA

/*
Copyright (c) 2008, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 2.6.0
*/

/**
* The CustomEvent class lets you define events for your application
* that can be subscribed to by one or more independent component.
*
* @param {String} type The type of event, which is passed to the callback
* when the event fires
* @param {Object} oScope The context the event will fire from. "this" will
* refer to this object in the callback. Default value:
* the window object. The listener can override this.
* @param {boolean} silent pass true to prevent the event from writing to
* the debugsystem
* @param {int} signature the signature that the custom event subscriber
* will receive. YAHOO.util.CustomEvent.LIST or
* YAHOO.util.CustomEvent.FLAT. The default is
* YAHOO.util.CustomEvent.LIST.
* @namespace YAHOO.util
* @class CustomEvent
* @constructor
*/
YAHOO.util.CustomEvent = function(type, oScope, silent, signature) {

 /**
 * The type of event, returned to subscribers when the event fires
 * @property type
 * @type string
 */
 this.type = type;

 /**
 * The scope the the event will fire from by default. Defaults to the window
 * obj
 * @property scope
 * @type object
 */
 this.scope = oScope || window;

 /**
 * By default all custom events are logged in the debug build, set silent
 * to true to disable debug outpu for this event.
 * @property silent
 * @type boolean
 */
 this.silent = silent;

 /**
 * Custom events support two styles of arguments provided to the event
 * subscribers.
 * <ul>
 * <li>YAHOO.util.CustomEvent.LIST:
 * <ul>
 * <li>param1: event name</li>
 * <li>param2: array of arguments sent to fire</li>
 * <li>param3: <optional> a custom object supplied by the subscriber</li>
 * </ul>
 * </li>
 * <li>YAHOO.util.CustomEvent.FLAT
 * <ul>
 * <li>param1: the first argument passed to fire. If you need to
 * pass multiple parameters, use and array or object literal</li>
 * <li>param2: <optional> a custom object supplied by the subscriber</li>
 * </ul>
 * </li>
 * </ul>
 * @property signature
 * @type int
 */
 this.signature = signature || YAHOO.util.CustomEvent.LIST;

 /**
 * The subscribers to this event
 * @property subscribers
 * @type Subscriber[]
 */
 this.subscribers = [];

 if (!this.silent) {
 }

 var onsubscribeType = "_YUICEOnSubscribe";

 // Only add subscribe events for events that are not generated by
 // CustomEvent
 if (type !== onsubscribeType) {

 /**
 * Custom events provide a custom event that fires whenever there is
 * a new subscriber to the event. This provides an opportunity to
 * handle the case where there is a non-repeating event that has
 * already fired has a new subscriber.
 *
 * @event subscribeEvent
 * @type YAHOO.util.CustomEvent
 * @param {Function} fn The function to execute
 * @param {Object} obj An object to be passed along when the event
 * fires
 * @param {boolean|Object} override If true, the obj passed in becomes
 * the execution scope of the listener.
 * if an object, that object becomes the
 * the execution scope.
 */
 this.subscribeEvent =
 new YAHOO.util.CustomEvent(onsubscribeType, this, true);

 }

 /**
 * In order to make it possible to execute the rest of the subscriber
 * stack when one thows an exception, the subscribers exceptions are
 * caught. The most recent exception is stored in this property
 * @property lastError
 * @type Error
 */
 this.lastError = null;
};

/**
* Subscriber listener sigature constant. The LIST type returns three
* parameters: the event type, the array of args passed to fire, and
* the optional custom object
* @property YAHOO.util.CustomEvent.LIST
* @static
* @type int
*/
YAHOO.util.CustomEvent.LIST = 0;

/**
* Subscriber listener sigature constant. The FLAT type returns two
* parameters: the first argument passed to fire and the optional
* custom object
* @property YAHOO.util.CustomEvent.FLAT
* @static
* @type int
*/
YAHOO.util.CustomEvent.FLAT = 1;

YAHOO.util.CustomEvent.prototype = {

 /**
 * Subscribes the caller to this event
 * @method subscribe
 * @param {Function} fn The function to execute
 * @param {Object} obj An object to be passed along when the event
 * fires
 * @param {boolean|Object} override If true, the obj passed in becomes
 * the execution scope of the listener.
 * if an object, that object becomes the
 * the execution scope.
 */
 subscribe: function(fn, obj, override) {

 if (!fn) {
throw new Error("Invalid callback for subscriber to '" + this.type + "'");
 }

 if (this.subscribeEvent) {
 this.subscribeEvent.fire(fn, obj, override);
 }

 this.subscribers.push( new YAHOO.util.Subscriber(fn, obj, override) );
 },

 /**
 * Unsubscribes subscribers.
 * @method unsubscribe
 * @param {Function} fn The subscribed function to remove, if not supplied
 * all will be removed
 * @param {Object} obj The custom object passed to subscribe. This is
 * optional, but if supplied will be used to
 * disambiguate multiple listeners that are the same
 * (e.g., you subscribe many object using a function
 * that lives on the prototype)
 * @return {boolean} True if the subscriber was found and detached.
 */
 unsubscribe: function(fn, obj) {

 if (!fn) {
 return this.unsubscribeAll();
 }

 var found = false;
 for (var i=0, len=this.subscribers.length; i<len; ++i) {
 var s = this.subscribers[i];
 if (s && s.contains(fn, obj)) {
 this._delete(i);
 found = true;
 }
 }

 return found;
 },

 /**
 * Notifies the subscribers. The callback functions will be executed
 * from the scope specified when the event was created, and with the
 * following parameters:
 * <ul>
 * <li>The type of event</li>
 * <li>All of the arguments fire() was executed with as an array</li>
 * <li>The custom object (if any) that was passed into the subscribe()
 * method</li>
 * </ul>
 * @method fire
 * @param {Object*} arguments an arbitrary set of parameters to pass to
 * the handler.
 * @return {boolean} false if one of the subscribers returned false,
 * true otherwise
 */
 fire: function() {

 this.lastError = null;

 var errors = [],
 len=this.subscribers.length;

 if (!len && this.silent) {
 return true;
 }

 var args=[].slice.call(arguments, 0), ret=true, i, rebuild=false;

 if (!this.silent) {
 }

 // make a copy of the subscribers so that there are
 // no index problems if one subscriber removes another.
 var subs = this.subscribers.slice(), throwErrors = YAHOO.util.Event.throwErrors;

 for (i=0; i<len; ++i) {
 var s = subs[i];
 if (!s) {
 rebuild=true;
 } else {
 if (!this.silent) {
 }

 var scope = s.getScope(this.scope);

 if (this.signature == YAHOO.util.CustomEvent.FLAT) {
 var param = null;
 if (args.length > 0) {
 param = args[0];
 }

 try {
 ret = s.fn.call(scope, param, s.obj);
 } catch(e) {
 this.lastError = e;
 // errors.push(e);
 if (throwErrors) {
 throw e;
 }
 }
 } else {
 try {
 ret = s.fn.call(scope, this.type, args, s.obj);
 } catch(ex) {
 this.lastError = ex;
 if (throwErrors) {
 throw ex;
 }
 }
 }

 if (false === ret) {
 if (!this.silent) {
 }

 break;
 // return false;
 }
 }
 }

 return (ret !== false);
 },

 /**
 * Removes all listeners
 * @method unsubscribeAll
 * @return {int} The number of listeners unsubscribed
 */
 unsubscribeAll: function() {
 for (var i=this.subscribers.length-1; i>-1; i--) {
 this._delete(i);
 }

 this.subscribers=[];

 return i;
 },

 /**
 * @method _delete
 * @private
 */
 _delete: function(index) {
 var s = this.subscribers[index];
 if (s) {
 delete s.fn;
 delete s.obj;
 }

 // this.subscribers[index]=null;
 this.subscribers.splice(index, 1);
 },

 /**
 * @method toString
 */
 toString: function() {
 return "CustomEvent: " + "'" + this.type + "', " +
 "scope: " + this.scope;

 }
};

/////////////////////////////////////////////////////////////////////

/**
* Stores the subscriber information to be used when the event fires.
* @param {Function} fn The function to execute
* @param {Object} obj An object to be passed along when the event fires
* @param {boolean} override If true, the obj passed in becomes the execution
* scope of the listener
* @class Subscriber
* @constructor
*/
YAHOO.util.Subscriber = function(fn, obj, override) {

 /**
 * The callback that will be execute when the event fires
 * @property fn
 * @type function
 */
 this.fn = fn;

 /**
 * An optional custom object that will passed to the callback when
 * the event fires
 * @property obj
 * @type object
 */
 this.obj = YAHOO.lang.isUndefined(obj) ? null : obj;

 /**
 * The default execution scope for the event listener is defined when the
 * event is created (usually the object which contains the event).
 * By setting override to true, the execution scope becomes the custom
 * object passed in by the subscriber. If override is an object, that
 * object becomes the scope.
 * @property override
 * @type boolean|object
 */
 this.override = override;

};

/**
* Returns the execution scope for this listener. If override was set to true
* the custom obj will be the scope. If override is an object, that is the
* scope, otherwise the default scope will be used.
* @method getScope
* @param {Object} defaultScope the scope to use if this listener does not
* override it.
*/
YAHOO.util.Subscriber.prototype.getScope = function(defaultScope) {
 if (this.override) {
 if (this.override === true) {
 return this.obj;
 } else {
 return this.override;
 }
 }
 return defaultScope;
};

/**
* Returns true if the fn and obj match this objects properties.
* Used by the unsubscribe method to match the right subscriber.
*
* @method contains
* @param {Function} fn the function to execute
* @param {Object} obj an object to be passed along when the event fires
* @return {boolean} true if the supplied arguments match this
* subscriber's signature.
*/
YAHOO.util.Subscriber.prototype.contains = function(fn, obj) {
 if (obj) {
 return (this.fn == fn && this.obj == obj);
 } else {
 return (this.fn == fn);
 }
};

/**
* @method toString
*/
YAHOO.util.Subscriber.prototype.toString = function() {
 return "Subscriber { obj: " + this.obj +
 ", override: " + (this.override || "no") + " }";
};

/**
* 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
 */
 var listeners = [];

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

 /**
 * Cache of DOM0 event handlers to work around issues with DOM2 events
 * in Safari
 * @property legacyEvents
 * @static
 * @private
 */
 var legacyEvents = [];

 /**
 * Listener stack for DOM0 events
 * @property legacyHandlers
 * @static
 * @private
 */
 var legacyHandlers = [];

 /**
 * 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
 */
 var retryCount = 0;

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

 /**
 * Lookup table for legacy events
 * @property legacyMap
 * @static
 * @private
 */
 var legacyMap = [];

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

 /**
 * Normalized keycodes for webkit/safari
 * @property webkitKeymap
 * @type {int: int}
 * @private
 * @static
 * @final
 */
 var 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)
 };

 // String constants used by the addFocusListener and removeFocusListener methods
 var _FOCUS = YAHOO.env.ua.ie ? "focusin" : "focus";
 var _BLUR = YAHOO.env.ua.ie ? "focusout" : "blur";

 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 2000@amp;20 ms, so it will poll
 * for 40 seconds or until all outstanding handlers are bound
 * (whichever comes first).
 * @property POLL_RETRYS
 * @type int
 * @static
 * @final
 */
 POLL_RETRYS: 2000,

 /**
 * The poll interval in milliseconds
 * @property POLL_INTERVAL
 * @type int
 * @static
 * @final
 */
 POLL_INTERVAL: 20,

 /**
 * 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 scope 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 scope, 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 scope 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: YAHOO.env.ua.ie,

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

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

 /**
 * 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);
 }
 },

 /**
 * 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.
 *
 * The callback is executed with a single parameter:
 * the custom object parameter, if provided.
 *
 * @method onAvailable
 *
 * @param {string||string[]} p_id the id of the element, or an array
 * of ids to look for.
 * @param {function} p_fn what to execute when the element is found.
 * @param {object} p_obj an optional object to be passed back as
 * a parameter to p_fn.
 * @param {boolean|object} p_override If set to true, p_fn will execute
 * in the scope of p_obj, if set to an object it
 * will execute in the scope of that object
 * @param checkContent {boolean} check child node readiness (onContentReady)
 * @static
 */
 onAvailable: function(p_id, p_fn, p_obj, p_override, checkContent) {

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

 for (var i=0; i<a.length; i=i+1) {
 onAvailStack.push({id: a[i],
 fn: p_fn,
 obj: p_obj,
 override: p_override,
 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.
 *
 * The callback is executed with a single parameter:
 * the custom object parameter, if provided.
 *
 * @method onContentReady
 *
 * @param {string} p_id the id of the element to look for.
 * @param {function} p_fn what to execute when the element is ready.
 * @param {object} p_obj an optional object to be passed back as
 * a parameter to p_fn.
 * @param {boolean|object} p_override If set to true, p_fn will execute
 * in the scope of p_obj. If an object, p_fn will
 * exectute in the scope of that object
 *
 * @static
 */
 onContentReady: function(p_id, p_fn, p_obj, p_override) {
 this.onAvailable(p_id, p_fn, p_obj, p_override, 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?
 *
 * The callback is a CustomEvent, so the signature is:
 * type <string>, args <array>, customobject <object>
 * For DOMReady events, there are no fire argments, so the
 * signature is:
 * "DOMReady", [], obj
 *
 *
 * @method onDOMReady
 *
 * @param {function} p_fn what to execute when the element is found.
 * @param {object} p_obj an optional object to be passed back as
 * a parameter to p_fn.
 * @param {boolean|object} p_scope If set to true, p_fn will execute
 * in the scope of p_obj, if set to an object it
 * will execute in the scope of that object
 *
 * @static
 */
 onDOMReady: function(p_fn, p_obj, p_override) {
 if (this.DOMReady) {
 setTimeout(function() {
 var s = window;
 if (p_override) {
 if (p_override === true) {
 s = p_obj;
 } else {
 s = p_override;
 }
 }
 p_fn.call(s, "DOMReady", [], p_obj);
 }, 0);
 } else {
 this.DOMReadyEvent.subscribe(p_fn, p_obj, p_override);
 }
 },

 /**
 * 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} override If true, the obj passed in becomes
 * the execution scope of the listener. If an
 * object, this object becomes the execution
 * scope.
 * @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, override, capture) {

 if (!fn || !fn.call) {
 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._addListener(el[i],
 sType,
 fn,
 obj,
 override,
 capture) && 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, override, capture);
 });

 return true;
 }
 }

 // Element should be an html element or an array if we get
 // here.
 if (!el) {
 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, override, capture];
 return true;
 }

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

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

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

 if (this.useLegacyEvent(el, sType)) {
 var legacyIndex = this.getLegacyIndex(el, sType);

 // Add a new dom0 wrapper if one is not detected for this
 // element
 if ( legacyIndex == -1 ||
 el != legacyEvents[legacyIndex][0] ) {

 legacyIndex = legacyEvents.length;
 legacyMap[el.id + sType] = legacyIndex;

 // cache the signature for the DOM0 event, and
 // include the existing handler for the event, if any
 legacyEvents[legacyIndex] =
 [el, sType, el["on" + sType]];
 legacyHandlers[legacyIndex] = [];

 el["on" + sType] =
 function(e) {
 YAHOO.util.Event.fireLegacyEvent(
 YAHOO.util.Event.getEvent(e), legacyIndex);
 };
 }

 // add a reference to the wrapped listener to our custom
 // stack of events
 //legacyHandlers[legacyIndex].push(index);
 legacyHandlers[legacyIndex].push(li);

 } else {
 try {
 this._simpleAdd(el, sType, wrappedFn, capture);
 } 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, capture);
 return false;
 }
 }

 return true;

 },

 /**
 * 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} override If true, the obj passed in becomes
 * the execution scope of the listener. If an
 * object, this object becomes the execution
 * scope.
 * @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, override) {
 return this._addListener(el, sType, fn, obj, override, false);
 },

 /**
 * Appends a focus event handler. (The focusin event is used for Internet Explorer,
 * the focus, capture-event for Opera, WebKit, and Gecko.)
 *
 * @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} override If true, the obj passed in becomes
 * the execution scope of the listener. If an
 * object, this object becomes the execution
 * scope.
 * @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
 */
 addFocusListener: function (el, fn, obj, override) {
 return this._addListener(el, _FOCUS, fn, obj, override, true);
 },

 /**
 * Removes a focus event listener
 *
 * @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
 */
 removeFocusListener: function (el, fn) {
 return this._removeListener(el, _FOCUS, fn, true);
 },

 /**
 * Appends a blur event handler. (The focusout event is used for Internet Explorer,
 * the focusout, capture-event for Opera, WebKit, and Gecko.)
 *
 * @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} override If true, the obj passed in becomes
 * the execution scope of the listener. If an
 * object, this object becomes the execution
 * scope.
 * @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
 */
 addBlurListener: function (el, fn, obj, override) {
 return this._addListener(el, _BLUR, fn, obj, override, true);
 },

 /**
 * Removes a blur event listener
 *
 * @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
 */
 removeBlurListener: function (el, fn) {

 return this._removeListener(el, _BLUR, fn, true);

 },

 /**
 * When using legacy events, the handler is routed to this object
 * so we can fire our custom listener stack.
 * @method fireLegacyEvent
 * @static
 * @private
 */
 fireLegacyEvent: function(e, legacyIndex) {
 var ok=true, le, lh, li, scope, ret;

 lh = legacyHandlers[legacyIndex].slice();
 for (var i=0, len=lh.length; i<len; ++i) {
 // for (var i in lh.length) {
 li = lh[i];
 if ( li && li[this.WFN] ) {
 scope = li[this.ADJ_SCOPE];
 ret = li[this.WFN].call(scope, e);
 ok = (ok && ret);
 }
 }

 // Fire the original handler if we replaced one. We fire this
 // after the other events to keep stopPropagation/preventDefault
 // that happened in the DOM0 handler from touching our DOM2
 // substitute
 le = legacyEvents[legacyIndex];
 if (le && le[2]) {
 le[2](e);
 }

 return ok;
 },

 /**
 * Returns the legacy event index that matches the supplied
 * signature
 * @method getLegacyIndex
 * @static
 * @private
 */
 getLegacyIndex: function(el, sType) {
 var key = this.generateId(el) + sType;
 if (typeof legacyMap[key] == "undefined") {
 return -1;
 } else {
 return legacyMap[key];
 }
 },

 /**
 * Logic that determines when we should automatically use legacy
 * events instead of DOM2 events. Currently this is limited to old
 * Safari browsers with a broken preventDefault
 * @method useLegacyEvent
 * @static
 * @private
 */
 useLegacyEvent: function(el, sType) {
return (this.webkit && this.webkit < 419 && ("click"==sType || "dblclick"==sType));
 },

 /**
 * 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.
 * @param {boolen} capture capture or bubble phase
 * @return {boolean} true if the unbind was successful, false
 * otherwise.
 * @static
 * @private
 */
 _removeListener: function(el, sType, fn, capture) {
 var i, len, li;

 // 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, capture) && ok );
 }
 return ok;
 }

 if (!fn || !fn.call) {
 //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[4];

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

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

 if (!el || !cacheItem) {
 return false;
 }

 if (this.useLegacyEvent(el, sType)) {
 var legacyIndex = this.getLegacyIndex(el, sType);
 var llist = legacyHandlers[legacyIndex];
 if (llist) {
 for (i=0, len=llist.length; i<len; ++i) {
 // for (i in llist.length) {
 li = llist[i];
 if (li &&
 li[this.EL] == el &&
 li[this.TYPE] == sType &&
 li[this.FN] == fn) {
 llist.splice(i, 1);
 // llist[i]=null;
 break;
 }
 }
 }

 } else {
 try {
 this._simpleRemove(el, sType, cacheItem[this.WFN], capture);
 } 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;

 },

 /**
 * 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) {

 return this._removeListener(el, sType, fn, false);

 },

 /**
 * 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.
 * @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 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(el, sType, fn) {
 for (var i=0, l=listeners.length; i<l; i=i+1) {
 var li = listeners[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) {
 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", this),

 /**
 * 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;
 clearInterval(this._interval);
 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;

 // 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 scope = el;
 if (item.override) {
 if (item.override === true) {
 scope = item.obj;
 } else {
 scope = item.override;
 }
 }
 item.fn.call(scope, 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 {
 clearInterval(this._interval);
 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, l.capture);
 }
 }

 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:
 * type: (string) the type of event
 * fn: (function) the callback supplied to addListener
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