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The Lift Framework event.js source code
/*
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>param2: array of arguments sent to fire
* <li>param3: a custom object supplied by the subscriber
* </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: a custom object supplied by the subscriber
* </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>All of the arguments fire() was executed with as an array
* <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>type <string>, args <array>, customobject <object>
* <p>For DOMReady events, there are no fire argments, so the
* signature is:</p>
* <p>"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
* obj: (object) the custom object supplied to addListener
* adjust: (boolean|object) whether or not to adjust the default scope
* scope: (boolean) the derived scope based on the adjust parameter
* scope: (capture) the capture parameter supplied to addListener
* 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 {
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],
capture: l[this.CAPTURE],
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();
// execute and clear stored unload listeners
for (i=0,len=unloadListeners.length; i<len; ++i) {
l = ul[i];
if (l) {
var scope = window;
if (l[EU.ADJ_SCOPE]) {
if (l[EU.ADJ_SCOPE] === true) {
scope = l[EU.UNLOAD_OBJ];
} else {
scope = l[EU.ADJ_SCOPE];
}
}
l[EU.FN].call(scope, EU.getEvent(e, l[EU.EL]), l[EU.UNLOAD_OBJ] );
ul[i] = null;
l=null;
scope=null;
}
}
unloadListeners = null;
// Remove listeners to handle IE memory leaks
//if (YAHOO.env.ua.ie && listeners && listeners.length > 0) {
// 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) {
EU._removeListener(l[EU.EL], l[EU.TYPE], l[EU.FN], l[EU.CAPTURE], j);
}
}
l=null;
}
legacyEvents = null;
EU._simpleRemove(window, "unload", EU._unload);
},
/**
* 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() {
// does nothing
},
/**
* Adds a DOM event directly without the caching, cleanup, scope 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;
/**
* YAHOO.util.Event.on is an alias for addListener
* @method on
* @see addListener
* @static
*/
EU.on = EU.addListener;
/**
* YAHOO.util.Event.onFocus is an alias for addFocusListener
* @method on
* @see addFocusListener
* @static
*/
EU.onFocus = EU.addFocusListener;
/**
* YAHOO.util.Event.onBlur is an alias for addBlurListener
* @method onBlur
* @see addBlurListener
* @static
*/
EU.onBlur = EU.addBlurListener;
/*! DOMReady: based on work by: Dean Edwards/John Resig/Matthias Miller */
// 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) {
// 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();
})();
}
/**
* EventProvider is designed to be used with YAHOO.augment to wrap
* CustomEvents in an interface that allows events to be subscribed to
* and fired by name. This makes it possible for implementing code to
* subscribe to an event that either has not been created yet, or will
* not be created at all.
*
* @Class EventProvider
*/
YAHOO.util.EventProvider = function() { };
YAHOO.util.EventProvider.prototype = {
/**
* Private storage of custom events
* @property __yui_events
* @type Object[]
* @private
*/
__yui_events: null,
/**
* Private storage of custom event subscribers
* @property __yui_subscribers
* @type Object[]
* @private
*/
__yui_subscribers: null,
/**
* Subscribe to a CustomEvent by event type
*
* @method subscribe
* @param p_type {string} the type, or name of the event
* @param p_fn {function} the function to exectute when the event fires
* @param p_obj {Object} An object to be passed along when the event
* fires
* @param p_override {boolean} If true, the obj passed in becomes the
* execution scope of the listener
*/
subscribe: function(p_type, p_fn, p_obj, p_override) {
this.__yui_events = this.__yui_events || {};
var ce = this.__yui_events[p_type];
if (ce) {
ce.subscribe(p_fn, p_obj, p_override);
} else {
this.__yui_subscribers = this.__yui_subscribers || {};
var subs = this.__yui_subscribers;
if (!subs[p_type]) {
subs[p_type] = [];
}
subs[p_type].push(
{ fn: p_fn, obj: p_obj, override: p_override } );
}
},
/**
* Unsubscribes one or more listeners the from the specified event
* @method unsubscribe
* @param p_type {string} The type, or name of the event. If the type
* is not specified, it will attempt to remove
* the listener from all hosted events.
* @param p_fn {Function} The subscribed function to unsubscribe, if not
* supplied, all subscribers will be removed.
* @param p_obj {Object} 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(p_type, p_fn, p_obj) {
this.__yui_events = this.__yui_events || {};
var evts = this.__yui_events;
if (p_type) {
var ce = evts[p_type];
if (ce) {
return ce.unsubscribe(p_fn, p_obj);
}
} else {
var ret = true;
for (var i in evts) {
if (YAHOO.lang.hasOwnProperty(evts, i)) {
ret = ret && evts[i].unsubscribe(p_fn, p_obj);
}
}
return ret;
}
return false;
},
/**
* Removes all listeners from the specified event. If the event type
* is not specified, all listeners from all hosted custom events will
* be removed.
* @method unsubscribeAll
* @param p_type {string} The type, or name of the event
*/
unsubscribeAll: function(p_type) {
return this.unsubscribe(p_type);
},
/**
* Creates a new custom event of the specified type. If a custom event
* by that name already exists, it will not be re-created. In either
* case the custom event is returned.
*
* @method createEvent
*
* @param p_type {string} the type, or name of the event
* @param p_config {object} optional config params. Valid properties are:
*
* <ul>
* <li>
* scope: defines the default execution scope. If not defined
* the default scope will be this instance.
* </li>
* <li>
* silent: if true, the custom event will not generate log messages.
* This is false by default.
* </li>
* <li>
* onSubscribeCallback: specifies a callback to execute when the
* event has a new subscriber. This will fire immediately for
* each queued subscriber if any exist prior to the creation of
* the event.
* </li>
* </ul>
*
* @return {CustomEvent} the custom event
*
*/
createEvent: function(p_type, p_config) {
this.__yui_events = this.__yui_events || {};
var opts = p_config || {};
var events = this.__yui_events;
if (events[p_type]) {
} else {
var scope = opts.scope || this;
var silent = (opts.silent);
var ce = new YAHOO.util.CustomEvent(p_type, scope, silent,
YAHOO.util.CustomEvent.FLAT);
events[p_type] = ce;
if (opts.onSubscribeCallback) {
ce.subscribeEvent.subscribe(opts.onSubscribeCallback);
}
this.__yui_subscribers = this.__yui_subscribers || {};
var qs = this.__yui_subscribers[p_type];
if (qs) {
for (var i=0; i<qs.length; ++i) {
ce.subscribe(qs[i].fn, qs[i].obj, qs[i].override);
}
}
}
return events[p_type];
},
/**
* Fire a custom event by name. The callback functions will be executed
* from the scope specified when the event was created, and with the
* following parameters:
* <ul>
* <li>The first argument fire() was executed with
* <li>The custom object (if any) that was passed into the subscribe()
* method</li>
* </ul>
* @method fireEvent
* @param p_type {string} the type, or name of the event
* @param arguments {Object*} an arbitrary set of parameters to pass to
* the handler.
* @return {boolean} the return value from CustomEvent.fire
*
*/
fireEvent: function(p_type, arg1, arg2, etc) {
this.__yui_events = this.__yui_events || {};
var ce = this.__yui_events[p_type];
if (!ce) {
return null;
}
var args = [];
for (var i=1; i<arguments.length; ++i) {
args.push(arguments[i]);
}
return ce.fire.apply(ce, args);
},
/**
* Returns true if the custom event of the provided type has been created
* with createEvent.
* @method hasEvent
* @param type {string} the type, or name of the event
*/
hasEvent: function(type) {
if (this.__yui_events) {
if (this.__yui_events[type]) {
return true;
}
}
return false;
}
};
//@TODO optimize
//@TODO use event utility, lang abstractions
//@TODO replace
/**
* KeyListener is a utility that provides an easy interface for listening for
* keydown/keyup events fired against DOM elements.
* @namespace YAHOO.util
* @class KeyListener
* @constructor
* @param {HTMLElement} attachTo The element or element ID to which the key
* event should be attached
* @param {String} attachTo The element or element ID to which the key
* event should be attached
* @param {Object} keyData The object literal representing the key(s)
* to detect. Possible attributes are
* shift(boolean), alt(boolean), ctrl(boolean)
* and keys(either an int or an array of ints
* representing keycodes).
* @param {Function} handler The CustomEvent handler to fire when the
* key event is detected
* @param {Object} handler An object literal representing the handler.
* @param {String} event Optional. The event (keydown or keyup) to
* listen for. Defaults automatically to keydown.
*
* @knownissue the "keypress" event is completely broken in Safari 2.x and below.
* the workaround is use "keydown" for key listening. However, if
* it is desired to prevent the default behavior of the keystroke,
* that can only be done on the keypress event. This makes key
* handling quite ugly.
* @knownissue keydown is also broken in Safari 2.x and below for the ESC key.
* There currently is no workaround other than choosing another
* key to listen for.
*/
YAHOO.util.KeyListener = function(attachTo, keyData, handler, event) {
if (!attachTo) {
} else if (!keyData) {
} else if (!handler) {
}
if (!event) {
event = YAHOO.util.KeyListener.KEYDOWN;
}
/**
* The CustomEvent fired internally when a key is pressed
* @event keyEvent
* @private
* @param {Object} keyData The object literal representing the key(s) to
* detect. Possible attributes are shift(boolean),
* alt(boolean), ctrl(boolean) and keys(either an
* int or an array of ints representing keycodes).
*/
var keyEvent = new YAHOO.util.CustomEvent("keyPressed");
/**
* The CustomEvent fired when the KeyListener is enabled via the enable()
* function
* @event enabledEvent
* @param {Object} keyData The object literal representing the key(s) to
* detect. Possible attributes are shift(boolean),
* alt(boolean), ctrl(boolean) and keys(either an
* int or an array of ints representing keycodes).
*/
this.enabledEvent = new YAHOO.util.CustomEvent("enabled");
/**
* The CustomEvent fired when the KeyListener is disabled via the
* disable() function
* @event disabledEvent
* @param {Object} keyData The object literal representing the key(s) to
* detect. Possible attributes are shift(boolean),
* alt(boolean), ctrl(boolean) and keys(either an
* int or an array of ints representing keycodes).
*/
this.disabledEvent = new YAHOO.util.CustomEvent("disabled");
if (typeof attachTo == 'string') {
attachTo = document.getElementById(attachTo);
}
if (typeof handler == 'function') {
keyEvent.subscribe(handler);
} else {
keyEvent.subscribe(handler.fn, handler.scope, handler.correctScope);
}
/**
* Handles the key event when a key is pressed.
* @method handleKeyPress
* @param {DOMEvent} e The keypress DOM event
* @param {Object} obj The DOM event scope object
* @private
*/
function handleKeyPress(e, obj) {
if (! keyData.shift) {
keyData.shift = false;
}
if (! keyData.alt) {
keyData.alt = false;
}
if (! keyData.ctrl) {
keyData.ctrl = false;
}
// check held down modifying keys first
if (e.shiftKey == keyData.shift &&
e.altKey == keyData.alt &&
e.ctrlKey == keyData.ctrl) { // if we pass this, all modifiers match
var dataItem;
if (keyData.keys instanceof Array) {
for (var i=0;i<keyData.keys.length;i++) {
dataItem = keyData.keys[i];
if (dataItem == e.charCode ) {
keyEvent.fire(e.charCode, e);
break;
} else if (dataItem == e.keyCode) {
keyEvent.fire(e.keyCode, e);
break;
}
}
} else {
dataItem = keyData.keys;
if (dataItem == e.charCode ) {
keyEvent.fire(e.charCode, e);
} else if (dataItem == e.keyCode) {
keyEvent.fire(e.keyCode, e);
}
}
}
}
/**
* Enables the KeyListener by attaching the DOM event listeners to the
* target DOM element
* @method enable
*/
this.enable = function() {
if (! this.enabled) {
YAHOO.util.Event.addListener(attachTo, event, handleKeyPress);
this.enabledEvent.fire(keyData);
}
/**
* Boolean indicating the enabled/disabled state of the Tooltip
* @property enabled
* @type Boolean
*/
this.enabled = true;
};
/**
* Disables the KeyListener by removing the DOM event listeners from the
* target DOM element
* @method disable
*/
this.disable = function() {
if (this.enabled) {
YAHOO.util.Event.removeListener(attachTo, event, handleKeyPress);
this.disabledEvent.fire(keyData);
}
this.enabled = false;
};
/**
* Returns a String representation of the object.
* @method toString
* @return {String} The string representation of the KeyListener
*/
this.toString = function() {
return "KeyListener [" + keyData.keys + "] " + attachTo.tagName +
(attachTo.id ? "[" + attachTo.id + "]" : "");
};
};
/**
* Constant representing the DOM "keydown" event.
* @property YAHOO.util.KeyListener.KEYDOWN
* @static
* @final
* @type String
*/
YAHOO.util.KeyListener.KEYDOWN = "keydown";
/**
* Constant representing the DOM "keyup" event.
* @property YAHOO.util.KeyListener.KEYUP
* @static
* @final
* @type String
*/
YAHOO.util.KeyListener.KEYUP = "keyup";
/**
* keycode constants for a subset of the special keys
* @property KEY
* @static
* @final
*/
YAHOO.util.KeyListener.KEY = {
ALT : 18,
BACK_SPACE : 8,
CAPS_LOCK : 20,
CONTROL : 17,
DELETE : 46,
DOWN : 40,
END : 35,
ENTER : 13,
ESCAPE : 27,
HOME : 36,
LEFT : 37,
META : 224,
NUM_LOCK : 144,
PAGE_DOWN : 34,
PAGE_UP : 33,
PAUSE : 19,
PRINTSCREEN : 44,
RIGHT : 39,
SCROLL_LOCK : 145,
SHIFT : 16,
SPACE : 32,
TAB : 9,
UP : 38
};
YAHOO.register("event", YAHOO.util.Event, {version: "2.6.0", build: "1321"});
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