/*
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.
*
* <p>The callback is executed with a single parameter:
* the custom object parameter, if provided.</p>
*
* @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.
*
* <p>The callback is executed with a single parameter:
* the custom object parameter, if provided.</p>
*
* @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?
*
* <p>The callback is a CustomEvent, so the signature is:</p>
* <p>type <string>, args <array>, customobject <object></p>
* <p>For DOMReady events, there are no fire argments, so the
* signature is:</p>
* <p>"DOMReady", [], obj</p>
*
*
* @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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