2 Copyright (c) 2009, Yahoo! Inc. All rights reserved.
3 Code licensed under the BSD License:
4 http://developer.yahoo.net/yui/license.txt
9 * The CustomEvent class lets you define events for your application
10 * that can be subscribed to by one or more independent component.
12 * @param {String} type The type of event, which is passed to the callback
13 * when the event fires
14 * @param {Object} context The context the event will fire from. "this" will
15 * refer to this object in the callback. Default value:
16 * the window object. The listener can override this.
17 * @param {boolean} silent pass true to prevent the event from writing to
19 * @param {int} signature the signature that the custom event subscriber
20 * will receive. YAHOO.util.CustomEvent.LIST or
21 * YAHOO.util.CustomEvent.FLAT. The default is
22 * YAHOO.util.CustomEvent.LIST.
23 * @param fireOnce {boolean} If configured to fire once, the custom event
24 * will only notify subscribers a single time regardless of how many times
25 * the event is fired. In addition, new subscribers will be notified
26 * immediately if the event has already been fired.
27 * @namespace YAHOO.util
31 YAHOO.util.CustomEvent = function(type, context, silent, signature, fireOnce) {
34 * The type of event, returned to subscribers when the event fires
41 * The context the event will fire from by default. Defaults to the window obj.
45 this.scope = context || window;
48 * By default all custom events are logged in the debug build. Set silent to true
49 * to disable debug output for this event.
56 * If configured to fire once, the custom event will only notify subscribers
57 * a single time regardless of how many times the event is fired. In addition,
58 * new subscribers will be notified immediately if the event has already been
64 this.fireOnce = fireOnce;
67 * Indicates whether or not this event has ever been fired.
75 * For fireOnce events the arguments the event was fired with are stored
76 * so that new subscribers get the proper payload.
80 this.firedWith = null;
83 * Custom events support two styles of arguments provided to the event
86 * <li>YAHOO.util.CustomEvent.LIST:
88 * <li>param1: event name</li>
89 * <li>param2: array of arguments sent to fire</li>
90 * <li>param3: <optional> a custom object supplied by the subscriber</li>
93 * <li>YAHOO.util.CustomEvent.FLAT
95 * <li>param1: the first argument passed to fire. If you need to
96 * pass multiple parameters, use and array or object literal</li>
97 * <li>param2: <optional> a custom object supplied by the subscriber</li>
101 * @property signature
104 this.signature = signature || YAHOO.util.CustomEvent.LIST;
107 * The subscribers to this event
108 * @property subscribers
111 this.subscribers = [];
114 YAHOO.log( "Creating " + this, "info", "Event" );
117 var onsubscribeType = "_YUICEOnSubscribe";
119 // Only add subscribe events for events that are not generated by
121 if (type !== onsubscribeType) {
124 * Custom events provide a custom event that fires whenever there is
125 * a new subscriber to the event. This provides an opportunity to
126 * handle the case where there is a non-repeating event that has
127 * already fired has a new subscriber.
129 * @event subscribeEvent
130 * @type YAHOO.util.CustomEvent
131 * @param fn {Function} The function to execute
132 * @param obj <Object> An object to be passed along when the event fires.
133 * Defaults to the custom event.
134 * @param override <boolean|Object> If true, the obj passed in becomes the
135 * execution context of the listener. If an object, that object becomes
136 * the execution context. Defaults to the custom event.
138 this.subscribeEvent =
139 new YAHOO.util.CustomEvent(onsubscribeType, this, true);
145 * In order to make it possible to execute the rest of the subscriber
146 * stack when one thows an exception, the subscribers exceptions are
147 * caught. The most recent exception is stored in this property
148 * @property lastError
151 this.lastError = null;
155 * Subscriber listener sigature constant. The LIST type returns three
156 * parameters: the event type, the array of args passed to fire, and
157 * the optional custom object
158 * @property YAHOO.util.CustomEvent.LIST
162 YAHOO.util.CustomEvent.LIST = 0;
165 * Subscriber listener sigature constant. The FLAT type returns two
166 * parameters: the first argument passed to fire and the optional
168 * @property YAHOO.util.CustomEvent.FLAT
172 YAHOO.util.CustomEvent.FLAT = 1;
174 YAHOO.util.CustomEvent.prototype = {
177 * Subscribes the caller to this event
179 * @param {Function} fn The function to execute
180 * @param {Object} obj An object to be passed along when the event fires.
181 * overrideContext <boolean|Object> If true, the obj passed in becomes the execution
182 * context of the listener. If an object, that object becomes the execution context.
184 subscribe: function(fn, obj, overrideContext) {
187 throw new Error("Invalid callback for subscriber to '" + this.type + "'");
190 if (this.subscribeEvent) {
191 this.subscribeEvent.fire(fn, obj, overrideContext);
194 var s = new YAHOO.util.Subscriber(fn, obj, overrideContext);
196 if (this.fireOnce && this.fired) {
197 this.notify(s, this.firedWith);
199 this.subscribers.push(s);
204 * Unsubscribes subscribers.
205 * @method unsubscribe
206 * @param {Function} fn The subscribed function to remove, if not supplied
207 * all will be removed
208 * @param {Object} obj The custom object passed to subscribe. This is
209 * optional, but if supplied will be used to
210 * disambiguate multiple listeners that are the same
211 * (e.g., you subscribe many object using a function
212 * that lives on the prototype)
213 * @return {boolean} True if the subscriber was found and detached.
215 unsubscribe: function(fn, obj) {
218 return this.unsubscribeAll();
222 for (var i=0, len=this.subscribers.length; i<len; ++i) {
223 var s = this.subscribers[i];
224 if (s && s.contains(fn, obj)) {
234 * Notifies the subscribers. The callback functions will be executed
235 * from the context specified when the event was created, and with the
236 * following parameters:
238 * <li>The type of event</li>
239 * <li>All of the arguments fire() was executed with as an array</li>
240 * <li>The custom object (if any) that was passed into the subscribe()
244 * @param {Object*} arguments an arbitrary set of parameters to pass to
246 * @return {boolean} false if one of the subscribers returned false,
251 this.lastError = null;
254 len=this.subscribers.length;
257 var args=[].slice.call(arguments, 0), ret=true, i, rebuild=false;
261 YAHOO.log('fireOnce event has already fired: ' + this.type);
264 this.firedWith = args;
270 if (!len && this.silent) {
271 //YAHOO.log('DEBUG no subscribers');
276 YAHOO.log( "Firing " + this + ", " +
277 "args: " + args + ", " +
278 "subscribers: " + len,
282 // make a copy of the subscribers so that there are
283 // no index problems if one subscriber removes another.
284 var subs = this.subscribers.slice();
286 for (i=0; i<len; ++i) {
292 ret = this.notify(s, args);
296 YAHOO.log("Event stopped, sub " + i + " of " + len, "info", "Event");
304 return (ret !== false);
307 notify: function(s, args) {
309 var ret, param=null, scope = s.getScope(this.scope),
310 throwErrors = YAHOO.util.Event.throwErrors;
313 YAHOO.log( this.type + "-> " + s, "info", "Event" );
316 if (this.signature == YAHOO.util.CustomEvent.FLAT) {
318 if (args.length > 0) {
323 ret = s.fn.call(scope, param, s.obj);
327 YAHOO.log(this + " subscriber exception: " + e, "error", "Event");
334 ret = s.fn.call(scope, this.type, args, s.obj);
337 YAHOO.log(this + " subscriber exception: " + ex, "error", "Event");
348 * Removes all listeners
349 * @method unsubscribeAll
350 * @return {int} The number of listeners unsubscribed
352 unsubscribeAll: function() {
353 var l = this.subscribers.length, i;
354 for (i=l-1; i>-1; i--) {
367 _delete: function(index) {
368 var s = this.subscribers[index];
374 // this.subscribers[index]=null;
375 this.subscribers.splice(index, 1);
381 toString: function() {
382 return "CustomEvent: " + "'" + this.type + "', " +
383 "context: " + this.scope;
388 /////////////////////////////////////////////////////////////////////
391 * Stores the subscriber information to be used when the event fires.
392 * @param {Function} fn The function to execute
393 * @param {Object} obj An object to be passed along when the event fires
394 * @param {boolean} overrideContext If true, the obj passed in becomes the execution
395 * context of the listener
399 YAHOO.util.Subscriber = function(fn, obj, overrideContext) {
402 * The callback that will be execute when the event fires
409 * An optional custom object that will passed to the callback when
414 this.obj = YAHOO.lang.isUndefined(obj) ? null : obj;
417 * The default execution context for the event listener is defined when the
418 * event is created (usually the object which contains the event).
419 * By setting overrideContext to true, the execution context becomes the custom
420 * object passed in by the subscriber. If overrideContext is an object, that
421 * object becomes the context.
422 * @property overrideContext
423 * @type boolean|object
425 this.overrideContext = overrideContext;
430 * Returns the execution context for this listener. If overrideContext was set to true
431 * the custom obj will be the context. If overrideContext is an object, that is the
432 * context, otherwise the default context will be used.
434 * @param {Object} defaultScope the context to use if this listener does not
437 YAHOO.util.Subscriber.prototype.getScope = function(defaultScope) {
438 if (this.overrideContext) {
439 if (this.overrideContext === true) {
442 return this.overrideContext;
449 * Returns true if the fn and obj match this objects properties.
450 * Used by the unsubscribe method to match the right subscriber.
453 * @param {Function} fn the function to execute
454 * @param {Object} obj an object to be passed along when the event fires
455 * @return {boolean} true if the supplied arguments match this
456 * subscriber's signature.
458 YAHOO.util.Subscriber.prototype.contains = function(fn, obj) {
460 return (this.fn == fn && this.obj == obj);
462 return (this.fn == fn);
469 YAHOO.util.Subscriber.prototype.toString = function() {
470 return "Subscriber { obj: " + this.obj +
471 ", overrideContext: " + (this.overrideContext || "no") + " }";
475 * The Event Utility provides utilities for managing DOM Events and tools
476 * for building event systems
479 * @title Event Utility
480 * @namespace YAHOO.util
484 // The first instance of Event will win if it is loaded more than once.
485 // @TODO this needs to be changed so that only the state data that needs to
486 // be preserved is kept, while methods are overwritten/added as needed.
487 // This means that the module pattern can't be used.
488 if (!YAHOO.util.Event) {
491 * The event utility provides functions to add and remove event listeners,
492 * event cleansing. It also tries to automatically remove listeners it
493 * registers during the unload event.
498 YAHOO.util.Event = function() {
501 * True after the onload event has fired
502 * @property loadComplete
507 var loadComplete = false,
510 * Cache of wrapped listeners
511 * @property listeners
520 * User-defined unload function that will be fired before all events
522 * @property unloadListeners
527 unloadListeners = [],
530 * The number of times to poll after window.onload. This number is
531 * increased if additional late-bound handlers are requested after
533 * @property retryCount
540 * onAvailable listeners
541 * @property onAvailStack
548 * Counter for auto id generation
556 * Normalized keycodes for webkit/safari
557 * @property webkitKeymap
568 63276: 33, // page up
569 63277: 34, // page down
570 25: 9 // SHIFT-TAB (Safari provides a different key code in
571 // this case, even though the shiftKey modifier is set)
574 isIE = YAHOO.env.ua.ie,
576 // String constants used by the addFocusListener and removeFocusListener methods
579 FOCUSOUT = "focusout";
584 * The number of times we should look for elements that are not
585 * in the DOM at the time the event is requested after the document
586 * has been loaded. The default is 500@amp;40 ms, so it will poll
587 * for 20 seconds or until all outstanding handlers are bound
588 * (whichever comes first).
589 * @property POLL_RETRYS
597 * The poll interval in milliseconds
598 * @property POLL_INTERVAL
606 * Element to bind, int constant
615 * Type of event, int constant
624 * Function to execute, int constant
633 * Function wrapped for context correction and cleanup, int constant
642 * Object passed in by the user that will be returned as a
643 * parameter to the callback, int constant. Specific to
653 * Adjusted context, either the element we are registering the event
654 * on or the custom object passed in by the listener, int constant
655 * @property ADJ_SCOPE
663 * The original obj passed into addListener
672 * The original context parameter passed into addListener
681 * The original capture parameter passed into addListener
690 * addListener/removeListener can throw errors in unexpected scenarios.
691 * These errors are suppressed, the method returns false, and this property
693 * @property lastError
704 * @deprecated use YAHOO.env.ua.webkit
706 isSafari: YAHOO.env.ua.webkit,
714 * @deprecated use YAHOO.env.ua.webkit
716 webkit: YAHOO.env.ua.webkit,
723 * @deprecated use YAHOO.env.ua.ie
729 * @property _interval
736 * document readystate poll handle
745 * Map of special event types
746 * @property _specialTypes
751 focusin: (isIE ? "focusin" : "focus"),
752 focusout: (isIE ? "focusout" : "blur")
757 * True when the document is initially usable
765 * Errors thrown by subscribers of custom events are caught
766 * and the error message is written to the debug console. If
767 * this property is set to true, it will also re-throw the
769 * @property throwErrors
777 * @method startInterval
781 startInterval: function() {
782 if (!this._interval) {
784 // var callback = function() { self._tryPreloadAttach(); };
785 // this._interval = setInterval(callback, this.POLL_INTERVAL);
786 this._interval = YAHOO.lang.later(this.POLL_INTERVAL, this, this._tryPreloadAttach, null, true);
791 * Executes the supplied callback when the item with the supplied
792 * id is found. This is meant to be used to execute behavior as
793 * soon as possible as the page loads. If you use this after the
794 * initial page load it will poll for a fixed time for the element.
795 * The number of times it will poll and the frequency are
796 * configurable. By default it will poll for 10 seconds.
798 * <p>The callback is executed with a single parameter:
799 * the custom object parameter, if provided.</p>
801 * @method onAvailable
803 * @param {string||string[]} id the id of the element, or an array
804 * of ids to look for.
805 * @param {function} fn what to execute when the element is found.
806 * @param {object} obj an optional object to be passed back as
808 * @param {boolean|object} overrideContext If set to true, fn will execute
809 * in the context of obj, if set to an object it
810 * will execute in the context of that object
811 * @param checkContent {boolean} check child node readiness (onContentReady)
814 onAvailable: function(id, fn, obj, overrideContext, checkContent) {
816 var a = (YAHOO.lang.isString(id)) ? [id] : id;
818 for (var i=0; i<a.length; i=i+1) {
819 onAvailStack.push({id: a[i],
822 overrideContext: overrideContext,
823 checkReady: checkContent });
826 retryCount = this.POLL_RETRYS;
828 this.startInterval();
832 * Works the same way as onAvailable, but additionally checks the
833 * state of sibling elements to determine if the content of the
834 * available element is safe to modify.
836 * <p>The callback is executed with a single parameter:
837 * the custom object parameter, if provided.</p>
839 * @method onContentReady
841 * @param {string} id the id of the element to look for.
842 * @param {function} fn what to execute when the element is ready.
843 * @param {object} obj an optional object to be passed back as
845 * @param {boolean|object} overrideContext If set to true, fn will execute
846 * in the context of obj. If an object, fn will
847 * exectute in the context of that object
851 onContentReady: function(id, fn, obj, overrideContext) {
852 this.onAvailable(id, fn, obj, overrideContext, true);
856 * Executes the supplied callback when the DOM is first usable. This
857 * will execute immediately if called after the DOMReady event has
858 * fired. @todo the DOMContentReady event does not fire when the
859 * script is dynamically injected into the page. This means the
860 * DOMReady custom event will never fire in FireFox or Opera when the
861 * library is injected. It _will_ fire in Safari, and the IE
862 * implementation would allow for us to fire it if the defered script
863 * is not available. We want this to behave the same in all browsers.
864 * Is there a way to identify when the script has been injected
865 * instead of included inline? Is there a way to know whether the
866 * window onload event has fired without having had a listener attached
867 * to it when it did so?
869 * <p>The callback is a CustomEvent, so the signature is:</p>
870 * <p>type <string>, args <array>, customobject <object></p>
871 * <p>For DOMReady events, there are no fire argments, so the
873 * <p>"DOMReady", [], obj</p>
878 * @param {function} fn what to execute when the element is found.
879 * @param {object} obj an optional object to be passed back as
881 * @param {boolean|object} overrideContext If set to true, fn will execute
882 * in the context of obj, if set to an object it
883 * will execute in the context of that object
887 // onDOMReady: function(fn, obj, overrideContext) {
888 onDOMReady: function() {
889 this.DOMReadyEvent.subscribe.apply(this.DOMReadyEvent, arguments);
894 * Appends an event handler
896 * @method _addListener
898 * @param {String|HTMLElement|Array|NodeList} el An id, an element
899 * reference, or a collection of ids and/or elements to assign the
901 * @param {String} sType The type of event to append
902 * @param {Function} fn The method the event invokes
903 * @param {Object} obj An arbitrary object that will be
904 * passed as a parameter to the handler
905 * @param {Boolean|object} overrideContext If true, the obj passed in becomes
906 * the execution context of the listener. If an
907 * object, this object becomes the execution
909 * @param {boolen} capture capture or bubble phase
910 * @return {Boolean} True if the action was successful or defered,
911 * false if one or more of the elements
912 * could not have the listener attached,
913 * or if the operation throws an exception.
917 _addListener: function(el, sType, fn, obj, overrideContext, bCapture) {
919 if (!fn || !fn.call) {
920 YAHOO.log(sType + " addListener failed, invalid callback", "error", "Event");
924 // The el argument can be an array of elements or element ids.
925 if ( this._isValidCollection(el)) {
927 for (var i=0,len=el.length; i<len; ++i) {
932 overrideContext) && ok;
936 } else if (YAHOO.lang.isString(el)) {
937 var oEl = this.getEl(el);
938 // If the el argument is a string, we assume it is
939 // actually the id of the element. If the page is loaded
940 // we convert el to the actual element, otherwise we
941 // defer attaching the event until onload event fires
943 // check to see if we need to delay hooking up the event
944 // until after the page loads.
948 // defer adding the event until the element is available
949 this.onAvailable(el, function() {
950 YAHOO.util.Event._addListener(el, sType, fn, obj, overrideContext, bCapture);
957 // Element should be an html element or an array if we get
960 // this.logger.debug("unable to attach event " + sType);
964 // we need to make sure we fire registered unload events
965 // prior to automatically unhooking them. So we hang on to
966 // these instead of attaching them to the window and fire the
967 // handles explicitly during our one unload event.
968 if ("unload" == sType && obj !== this) {
969 unloadListeners[unloadListeners.length] =
970 [el, sType, fn, obj, overrideContext];
974 // this.logger.debug("Adding handler: " + el + ", " + sType);
976 // if the user chooses to override the context, we use the custom
977 // object passed in, otherwise the executing context will be the
978 // HTML element that the event is registered on
980 if (overrideContext) {
981 if (overrideContext === true) {
984 context = overrideContext;
988 // wrap the function so we can return the obj object when
990 var wrappedFn = function(e) {
991 return fn.call(context, YAHOO.util.Event.getEvent(e, el),
995 var li = [el, sType, fn, wrappedFn, context, obj, overrideContext, bCapture];
996 var index = listeners.length;
997 // cache the listener so we can try to automatically unload
998 listeners[index] = li;
1001 this._simpleAdd(el, sType, wrappedFn, bCapture);
1003 // handle an error trying to attach an event. If it fails
1004 // we need to clean up the cache
1005 this.lastError = ex;
1006 this.removeListener(el, sType, fn);
1015 * Checks to see if the type requested is a special type
1016 * (as defined by the _specialTypes hash), and (if so) returns
1017 * the special type name.
1021 * @param {String} sType The type to look up
1024 _getType: function (type) {
1026 return this._specialTypes[type] || type;
1032 * Appends an event handler
1034 * @method addListener
1036 * @param {String|HTMLElement|Array|NodeList} el An id, an element
1037 * reference, or a collection of ids and/or elements to assign the
1039 * @param {String} sType The type of event to append
1040 * @param {Function} fn The method the event invokes
1041 * @param {Object} obj An arbitrary object that will be
1042 * passed as a parameter to the handler
1043 * @param {Boolean|object} overrideContext If true, the obj passed in becomes
1044 * the execution context of the listener. If an
1045 * object, this object becomes the execution
1047 * @return {Boolean} True if the action was successful or defered,
1048 * false if one or more of the elements
1049 * could not have the listener attached,
1050 * or if the operation throws an exception.
1053 addListener: function (el, sType, fn, obj, overrideContext) {
1055 var capture = ((sType == FOCUSIN || sType == FOCUSOUT) && !YAHOO.env.ua.ie) ? true : false;
1057 return this._addListener(el, this._getType(sType), fn, obj, overrideContext, capture);
1063 * Attaches a focusin event listener to the specified element for
1064 * the purpose of listening for the focus event on the element's
1066 * @method addFocusListener
1068 * @param {String|HTMLElement|Array|NodeList} el An id, an element
1069 * reference, or a collection of ids and/or elements to assign the
1071 * @param {Function} fn The method the event invokes
1072 * @param {Object} obj An arbitrary object that will be
1073 * passed as a parameter to the handler
1074 * @param {Boolean|object} overrideContext If true, the obj passed in becomes
1075 * the execution context of the listener. If an
1076 * object, this object becomes the execution
1078 * @return {Boolean} True if the action was successful or defered,
1079 * false if one or more of the elements
1080 * could not have the listener attached,
1081 * or if the operation throws an exception.
1083 * @deprecated use YAHOO.util.Event.on and specify "focusin" as the event type.
1085 addFocusListener: function (el, fn, obj, overrideContext) {
1086 return this.on(el, FOCUSIN, fn, obj, overrideContext);
1091 * Removes a focusin event listener to the specified element for
1092 * the purpose of listening for the focus event on the element's
1095 * @method removeFocusListener
1097 * @param {String|HTMLElement|Array|NodeList} el An id, an element
1098 * reference, or a collection of ids and/or elements to remove
1099 * the listener from.
1100 * @param {Function} fn the method the event invokes. If fn is
1101 * undefined, then all event handlers for the type of event are
1103 * @return {boolean} true if the unbind was successful, false
1106 * @deprecated use YAHOO.util.Event.removeListener and specify "focusin" as the event type.
1108 removeFocusListener: function (el, fn) {
1109 return this.removeListener(el, FOCUSIN, fn);
1113 * Attaches a focusout event listener to the specified element for
1114 * the purpose of listening for the blur event on the element's
1117 * @method addBlurListener
1119 * @param {String|HTMLElement|Array|NodeList} el An id, an element
1120 * reference, or a collection of ids and/or elements to assign the
1122 * @param {Function} fn The method the event invokes
1123 * @param {Object} obj An arbitrary object that will be
1124 * passed as a parameter to the handler
1125 * @param {Boolean|object} overrideContext If true, the obj passed in becomes
1126 * the execution context of the listener. If an
1127 * object, this object becomes the execution
1129 * @return {Boolean} True if the action was successful or defered,
1130 * false if one or more of the elements
1131 * could not have the listener attached,
1132 * or if the operation throws an exception.
1134 * @deprecated use YAHOO.util.Event.on and specify "focusout" as the event type.
1136 addBlurListener: function (el, fn, obj, overrideContext) {
1137 return this.on(el, FOCUSOUT, fn, obj, overrideContext);
1141 * Removes a focusout event listener to the specified element for
1142 * the purpose of listening for the blur event on the element's
1145 * @method removeBlurListener
1147 * @param {String|HTMLElement|Array|NodeList} el An id, an element
1148 * reference, or a collection of ids and/or elements to remove
1149 * the listener from.
1150 * @param {Function} fn the method the event invokes. If fn is
1151 * undefined, then all event handlers for the type of event are
1153 * @return {boolean} true if the unbind was successful, false
1156 * @deprecated use YAHOO.util.Event.removeListener and specify "focusout" as the event type.
1158 removeBlurListener: function (el, fn) {
1159 return this.removeListener(el, FOCUSOUT, fn);
1163 * Removes an event listener
1165 * @method removeListener
1167 * @param {String|HTMLElement|Array|NodeList} el An id, an element
1168 * reference, or a collection of ids and/or elements to remove
1169 * the listener from.
1170 * @param {String} sType the type of event to remove.
1171 * @param {Function} fn the method the event invokes. If fn is
1172 * undefined, then all event handlers for the type of event are
1174 * @return {boolean} true if the unbind was successful, false
1178 removeListener: function(el, sType, fn) {
1181 sType = this._getType(sType);
1183 // The el argument can be a string
1184 if (typeof el == "string") {
1185 el = this.getEl(el);
1186 // The el argument can be an array of elements or element ids.
1187 } else if ( this._isValidCollection(el)) {
1189 for (i=el.length-1; i>-1; i--) {
1190 ok = ( this.removeListener(el[i], sType, fn) && ok );
1195 if (!fn || !fn.call) {
1196 // this.logger.debug("Error, function is not valid " + fn);
1198 return this.purgeElement(el, false, sType);
1201 if ("unload" == sType) {
1203 for (i=unloadListeners.length-1; i>-1; i--) {
1204 li = unloadListeners[i];
1209 unloadListeners.splice(i, 1);
1210 // unloadListeners[i]=null;
1218 var cacheItem = null;
1220 // The index is a hidden parameter; needed to remove it from
1221 // the method signature because it was tempting users to
1222 // try and take advantage of it, which is not possible.
1223 var index = arguments[3];
1225 if ("undefined" === typeof index) {
1226 index = this._getCacheIndex(listeners, el, sType, fn);
1230 cacheItem = listeners[index];
1233 if (!el || !cacheItem) {
1234 // this.logger.debug("cached listener not found");
1238 // this.logger.debug("Removing handler: " + el + ", " + sType);
1240 var bCapture = cacheItem[this.CAPTURE] === true ? true : false;
1243 this._simpleRemove(el, sType, cacheItem[this.WFN], bCapture);
1245 this.lastError = ex;
1249 // removed the wrapped handler
1250 delete listeners[index][this.WFN];
1251 delete listeners[index][this.FN];
1252 listeners.splice(index, 1);
1253 // listeners[index]=null;
1260 * Returns the event's target element. Safari sometimes provides
1261 * a text node, and this is automatically resolved to the text
1262 * node's parent so that it behaves like other browsers.
1264 * @param {Event} ev the event
1265 * @param {boolean} resolveTextNode when set to true the target's
1266 * parent will be returned if the target is a
1267 * text node. @deprecated, the text node is
1268 * now resolved automatically
1269 * @return {HTMLElement} the event's target
1272 getTarget: function(ev, resolveTextNode) {
1273 var t = ev.target || ev.srcElement;
1274 return this.resolveTextNode(t);
1278 * In some cases, some browsers will return a text node inside
1279 * the actual element that was targeted. This normalizes the
1280 * return value for getTarget and getRelatedTarget.
1281 * @method resolveTextNode
1282 * @param {HTMLElement} node node to resolve
1283 * @return {HTMLElement} the normized node
1286 resolveTextNode: function(n) {
1288 if (n && 3 == n.nodeType) {
1289 return n.parentNode;
1297 * Returns the event's pageX
1299 * @param {Event} ev the event
1300 * @return {int} the event's pageX
1303 getPageX: function(ev) {
1305 if (!x && 0 !== x) {
1306 x = ev.clientX || 0;
1309 x += this._getScrollLeft();
1317 * Returns the event's pageY
1319 * @param {Event} ev the event
1320 * @return {int} the event's pageY
1323 getPageY: function(ev) {
1325 if (!y && 0 !== y) {
1326 y = ev.clientY || 0;
1329 y += this._getScrollTop();
1338 * Returns the pageX and pageY properties as an indexed array.
1340 * @param {Event} ev the event
1341 * @return {[x, y]} the pageX and pageY properties of the event
1344 getXY: function(ev) {
1345 return [this.getPageX(ev), this.getPageY(ev)];
1349 * Returns the event's related target
1350 * @method getRelatedTarget
1351 * @param {Event} ev the event
1352 * @return {HTMLElement} the event's relatedTarget
1355 getRelatedTarget: function(ev) {
1356 var t = ev.relatedTarget;
1358 if (ev.type == "mouseout") {
1360 } else if (ev.type == "mouseover") {
1365 return this.resolveTextNode(t);
1369 * Returns the time of the event. If the time is not included, the
1370 * event is modified using the current time.
1372 * @param {Event} ev the event
1373 * @return {Date} the time of the event
1376 getTime: function(ev) {
1378 var t = new Date().getTime();
1382 this.lastError = ex;
1391 * Convenience method for stopPropagation + preventDefault
1393 * @param {Event} ev the event
1396 stopEvent: function(ev) {
1397 this.stopPropagation(ev);
1398 this.preventDefault(ev);
1402 * Stops event propagation
1403 * @method stopPropagation
1404 * @param {Event} ev the event
1407 stopPropagation: function(ev) {
1408 if (ev.stopPropagation) {
1409 ev.stopPropagation();
1411 ev.cancelBubble = true;
1416 * Prevents the default behavior of the event
1417 * @method preventDefault
1418 * @param {Event} ev the event
1421 preventDefault: function(ev) {
1422 if (ev.preventDefault) {
1423 ev.preventDefault();
1425 ev.returnValue = false;
1430 * Finds the event in the window object, the caller's arguments, or
1431 * in the arguments of another method in the callstack. This is
1432 * executed automatically for events registered through the event
1433 * manager, so the implementer should not normally need to execute
1434 * this function at all.
1436 * @param {Event} e the event parameter from the handler
1437 * @param {HTMLElement} boundEl the element the listener is attached to
1438 * @return {Event} the event
1441 getEvent: function(e, boundEl) {
1442 var ev = e || window.event;
1445 var c = this.getEvent.caller;
1447 ev = c.arguments[0];
1448 if (ev && Event == ev.constructor) {
1459 * Returns the charcode for an event
1460 * @method getCharCode
1461 * @param {Event} ev the event
1462 * @return {int} the event's charCode
1465 getCharCode: function(ev) {
1466 var code = ev.keyCode || ev.charCode || 0;
1468 // webkit key normalization
1469 if (YAHOO.env.ua.webkit && (code in webkitKeymap)) {
1470 code = webkitKeymap[code];
1476 * Locating the saved event handler data by function ref
1478 * @method _getCacheIndex
1482 _getCacheIndex: function(a, el, sType, fn) {
1483 for (var i=0, l=a.length; i<l; i=i+1) {
1486 li[this.FN] == fn &&
1487 li[this.EL] == el &&
1488 li[this.TYPE] == sType ) {
1497 * Generates an unique ID for the element if it does not already
1499 * @method generateId
1500 * @param el the element to create the id for
1501 * @return {string} the resulting id of the element
1504 generateId: function(el) {
1508 id = "yuievtautoid-" + counter;
1518 * We want to be able to use getElementsByTagName as a collection
1519 * to attach a group of events to. Unfortunately, different
1520 * browsers return different types of collections. This function
1521 * tests to determine if the object is array-like. It will also
1522 * fail if the object is an array, but is empty.
1523 * @method _isValidCollection
1524 * @param o the object to test
1525 * @return {boolean} true if the object is array-like and populated
1529 _isValidCollection: function(o) {
1531 return ( o && // o is something
1532 typeof o !== "string" && // o is not a string
1533 o.length && // o is indexed
1534 !o.tagName && // o is not an HTML element
1535 !o.alert && // o is not a window
1536 typeof o[0] !== "undefined" );
1538 YAHOO.log("node access error (xframe?)", "warn");
1549 * @deprecated Elements are not cached due to issues that arise when
1550 * elements are removed and re-added
1555 * We cache elements bound by id because when the unload event
1556 * fires, we can no longer use document.getElementById
1560 * @deprecated Elements are not cached any longer
1562 getEl: function(id) {
1563 return (typeof id === "string") ? document.getElementById(id) : id;
1567 * Clears the element cache
1568 * @deprecated Elements are not cached any longer
1569 * @method clearCache
1573 clearCache: function() { },
1576 * Custom event the fires when the dom is initially usable
1577 * @event DOMReadyEvent
1579 DOMReadyEvent: new YAHOO.util.CustomEvent("DOMReady", YAHOO, 0, 0, 1),
1582 * hook up any deferred listeners
1587 _load: function(e) {
1589 if (!loadComplete) {
1590 loadComplete = true;
1591 var EU = YAHOO.util.Event;
1593 // Just in case DOMReady did not go off for some reason
1596 // Available elements may not have been detected before the
1597 // window load event fires. Try to find them now so that the
1598 // the user is more likely to get the onAvailable notifications
1599 // before the window load notification
1600 EU._tryPreloadAttach();
1606 * Fires the DOMReady event listeners the first time the document is
1612 _ready: function(e) {
1613 var EU = YAHOO.util.Event;
1617 // Fire the content ready custom event
1618 EU.DOMReadyEvent.fire();
1620 // Remove the DOMContentLoaded (FF/Opera)
1621 EU._simpleRemove(document, "DOMContentLoaded", EU._ready);
1626 * Polling function that runs before the onload event fires,
1627 * attempting to attach to DOM Nodes as soon as they are
1629 * @method _tryPreloadAttach
1633 _tryPreloadAttach: function() {
1635 if (onAvailStack.length === 0) {
1637 if (this._interval) {
1638 // clearInterval(this._interval);
1639 this._interval.cancel();
1640 this._interval = null;
1650 // Hold off if DOMReady has not fired and check current
1651 // readyState to protect against the IE operation aborted
1653 if (!this.DOMReady) {
1654 this.startInterval();
1661 // this.logger.debug("tryPreloadAttach");
1663 // keep trying until after the page is loaded. We need to
1664 // check the page load state prior to trying to bind the
1665 // elements so that we can be certain all elements have been
1666 // tested appropriately
1667 var tryAgain = !loadComplete;
1669 tryAgain = (retryCount > 0 && onAvailStack.length > 0);
1675 var executeItem = function (el, item) {
1677 if (item.overrideContext) {
1678 if (item.overrideContext === true) {
1681 context = item.overrideContext;
1684 item.fn.call(context, item.obj);
1687 var i, len, item, el, ready=[];
1689 // onAvailable onContentReady
1690 for (i=0, len=onAvailStack.length; i<len; i=i+1) {
1691 item = onAvailStack[i];
1693 el = this.getEl(item.id);
1695 if (item.checkReady) {
1696 if (loadComplete || el.nextSibling || !tryAgain) {
1698 onAvailStack[i] = null;
1701 executeItem(el, item);
1702 onAvailStack[i] = null;
1705 notAvail.push(item);
1710 // make sure onContentReady fires after onAvailable
1711 for (i=0, len=ready.length; i<len; i=i+1) {
1713 executeItem(this.getEl(item.id), item);
1720 for (i=onAvailStack.length-1; i>-1; i--) {
1721 item = onAvailStack[i];
1722 if (!item || !item.id) {
1723 onAvailStack.splice(i, 1);
1727 this.startInterval();
1729 if (this._interval) {
1730 // clearInterval(this._interval);
1731 this._interval.cancel();
1732 this._interval = null;
1736 this.locked = false;
1741 * Removes all listeners attached to the given element via addListener.
1742 * Optionally, the node's children can also be purged.
1743 * Optionally, you can specify a specific type of event to remove.
1744 * @method purgeElement
1745 * @param {HTMLElement} el the element to purge
1746 * @param {boolean} recurse recursively purge this element's children
1747 * as well. Use with caution.
1748 * @param {string} sType optional type of listener to purge. If
1749 * left out, all listeners will be removed
1752 purgeElement: function(el, recurse, sType) {
1753 var oEl = (YAHOO.lang.isString(el)) ? this.getEl(el) : el;
1754 var elListeners = this.getListeners(oEl, sType), i, len;
1756 for (i=elListeners.length-1; i>-1; i--) {
1757 var l = elListeners[i];
1758 this.removeListener(oEl, l.type, l.fn);
1762 if (recurse && oEl && oEl.childNodes) {
1763 for (i=0,len=oEl.childNodes.length; i<len ; ++i) {
1764 this.purgeElement(oEl.childNodes[i], recurse, sType);
1770 * Returns all listeners attached to the given element via addListener.
1771 * Optionally, you can specify a specific type of event to return.
1772 * @method getListeners
1773 * @param el {HTMLElement|string} the element or element id to inspect
1774 * @param sType {string} optional type of listener to return. If
1775 * left out, all listeners will be returned
1776 * @return {Object} the listener. Contains the following fields:
1777 * type: (string) the type of event
1778 * fn: (function) the callback supplied to addListener
1779 * obj: (object) the custom object supplied to addListener
1780 * adjust: (boolean|object) whether or not to adjust the default context
1781 * scope: (boolean) the derived context based on the adjust parameter
1782 * index: (int) its position in the Event util listener cache
1785 getListeners: function(el, sType) {
1786 var results=[], searchLists;
1788 searchLists = [listeners, unloadListeners];
1789 } else if (sType === "unload") {
1790 searchLists = [unloadListeners];
1792 sType = this._getType(sType);
1793 searchLists = [listeners];
1796 var oEl = (YAHOO.lang.isString(el)) ? this.getEl(el) : el;
1798 for (var j=0;j<searchLists.length; j=j+1) {
1799 var searchList = searchLists[j];
1801 for (var i=0,len=searchList.length; i<len ; ++i) {
1802 var l = searchList[i];
1803 if ( l && l[this.EL] === oEl &&
1804 (!sType || sType === l[this.TYPE]) ) {
1809 adjust: l[this.OVERRIDE],
1810 scope: l[this.ADJ_SCOPE],
1818 return (results.length) ? results : null;
1822 * Removes all listeners registered by pe.event. Called
1823 * automatically during the unload event.
1828 _unload: function(e) {
1830 var EU = YAHOO.util.Event, i, j, l, len, index,
1831 ul = unloadListeners.slice(), context;
1833 // execute and clear stored unload listeners
1834 for (i=0, len=unloadListeners.length; i<len; ++i) {
1838 if (l[EU.ADJ_SCOPE]) {
1839 if (l[EU.ADJ_SCOPE] === true) {
1840 context = l[EU.UNLOAD_OBJ];
1842 context = l[EU.ADJ_SCOPE];
1845 l[EU.FN].call(context, EU.getEvent(e, l[EU.EL]), l[EU.UNLOAD_OBJ] );
1852 unloadListeners = null;
1854 // Remove listeners to handle IE memory leaks
1855 // 2.5.0 listeners are removed for all browsers again. FireFox preserves
1856 // at least some listeners between page refreshes, potentially causing
1857 // errors during page load (mouseover listeners firing before they
1858 // should if the user moves the mouse at the correct moment).
1860 for (j=listeners.length-1; j>-1; j--) {
1863 EU.removeListener(l[EU.EL], l[EU.TYPE], l[EU.FN], j);
1869 EU._simpleRemove(window, "unload", EU._unload);
1874 * Returns scrollLeft
1875 * @method _getScrollLeft
1879 _getScrollLeft: function() {
1880 return this._getScroll()[1];
1885 * @method _getScrollTop
1889 _getScrollTop: function() {
1890 return this._getScroll()[0];
1894 * Returns the scrollTop and scrollLeft. Used to calculate the
1895 * pageX and pageY in Internet Explorer
1896 * @method _getScroll
1900 _getScroll: function() {
1901 var dd = document.documentElement, db = document.body;
1902 if (dd && (dd.scrollTop || dd.scrollLeft)) {
1903 return [dd.scrollTop, dd.scrollLeft];
1905 return [db.scrollTop, db.scrollLeft];
1912 * Used by old versions of CustomEvent, restored for backwards
1917 * @deprecated still here for backwards compatibility
1919 regCE: function() {},
1922 * Adds a DOM event directly without the caching, cleanup, context adj, etc
1924 * @method _simpleAdd
1925 * @param {HTMLElement} el the element to bind the handler to
1926 * @param {string} sType the type of event handler
1927 * @param {function} fn the callback to invoke
1928 * @param {boolen} capture capture or bubble phase
1932 _simpleAdd: function () {
1933 if (window.addEventListener) {
1934 return function(el, sType, fn, capture) {
1935 el.addEventListener(sType, fn, (capture));
1937 } else if (window.attachEvent) {
1938 return function(el, sType, fn, capture) {
1939 el.attachEvent("on" + sType, fn);
1942 return function(){};
1947 * Basic remove listener
1949 * @method _simpleRemove
1950 * @param {HTMLElement} el the element to bind the handler to
1951 * @param {string} sType the type of event handler
1952 * @param {function} fn the callback to invoke
1953 * @param {boolen} capture capture or bubble phase
1957 _simpleRemove: function() {
1958 if (window.removeEventListener) {
1959 return function (el, sType, fn, capture) {
1960 el.removeEventListener(sType, fn, (capture));
1962 } else if (window.detachEvent) {
1963 return function (el, sType, fn) {
1964 el.detachEvent("on" + sType, fn);
1967 return function(){};
1975 var EU = YAHOO.util.Event;
1978 * YAHOO.util.Event.on is an alias for addListener
1983 EU.on = EU.addListener;
1986 * YAHOO.util.Event.onFocus is an alias for addFocusListener
1988 * @see addFocusListener
1990 * @deprecated use YAHOO.util.Event.on and specify "focusin" as the event type.
1992 EU.onFocus = EU.addFocusListener;
1995 * YAHOO.util.Event.onBlur is an alias for addBlurListener
1997 * @see addBlurListener
1999 * @deprecated use YAHOO.util.Event.on and specify "focusout" as the event type.
2001 EU.onBlur = EU.addBlurListener;
2003 /*! DOMReady: based on work by: Dean Edwards/John Resig/Matthias Miller/Diego Perini */
2005 // Internet Explorer: use the readyState of a defered script.
2006 // This isolates what appears to be a safe moment to manipulate
2007 // the DOM prior to when the document's readyState suggests
2008 // it is safe to do so.
2010 if (self !== self.top) {
2011 document.onreadystatechange = function() {
2012 if (document.readyState == 'complete') {
2013 document.onreadystatechange = null;
2019 // Process onAvailable/onContentReady items when the
2021 YAHOO.util.Event.onDOMReady(
2022 YAHOO.util.Event._tryPreloadAttach,
2023 YAHOO.util.Event, true);
2025 var n = document.createElement('p');
2027 EU._dri = setInterval(function() {
2029 // throws an error if doc is not ready
2031 clearInterval(EU._dri);
2037 }, EU.POLL_INTERVAL);
2040 // The document's readyState in Safari currently will
2041 // change to loaded/complete before images are loaded.
2042 } else if (EU.webkit && EU.webkit < 525) {
2044 EU._dri = setInterval(function() {
2045 var rs=document.readyState;
2046 if ("loaded" == rs || "complete" == rs) {
2047 clearInterval(EU._dri);
2051 }, EU.POLL_INTERVAL);
2053 // FireFox and Opera: These browsers provide a event for this
2054 // moment. The latest WebKit releases now support this event.
2057 EU._simpleAdd(document, "DOMContentLoaded", EU._ready);
2060 /////////////////////////////////////////////////////////////
2063 EU._simpleAdd(window, "load", EU._load);
2064 EU._simpleAdd(window, "unload", EU._unload);
2065 EU._tryPreloadAttach();
2070 * EventProvider is designed to be used with YAHOO.augment to wrap
2071 * CustomEvents in an interface that allows events to be subscribed to
2072 * and fired by name. This makes it possible for implementing code to
2073 * subscribe to an event that either has not been created yet, or will
2074 * not be created at all.
2076 * @Class EventProvider
2078 YAHOO.util.EventProvider = function() { };
2080 YAHOO.util.EventProvider.prototype = {
2083 * Private storage of custom events
2084 * @property __yui_events
2091 * Private storage of custom event subscribers
2092 * @property __yui_subscribers
2096 __yui_subscribers: null,
2099 * Subscribe to a CustomEvent by event type
2102 * @param p_type {string} the type, or name of the event
2103 * @param p_fn {function} the function to exectute when the event fires
2104 * @param p_obj {Object} An object to be passed along when the event
2106 * @param overrideContext {boolean} If true, the obj passed in becomes the
2107 * execution scope of the listener
2109 subscribe: function(p_type, p_fn, p_obj, overrideContext) {
2111 this.__yui_events = this.__yui_events || {};
2112 var ce = this.__yui_events[p_type];
2115 ce.subscribe(p_fn, p_obj, overrideContext);
2117 this.__yui_subscribers = this.__yui_subscribers || {};
2118 var subs = this.__yui_subscribers;
2119 if (!subs[p_type]) {
2123 { fn: p_fn, obj: p_obj, overrideContext: overrideContext } );
2128 * Unsubscribes one or more listeners the from the specified event
2129 * @method unsubscribe
2130 * @param p_type {string} The type, or name of the event. If the type
2131 * is not specified, it will attempt to remove
2132 * the listener from all hosted events.
2133 * @param p_fn {Function} The subscribed function to unsubscribe, if not
2134 * supplied, all subscribers will be removed.
2135 * @param p_obj {Object} The custom object passed to subscribe. This is
2136 * optional, but if supplied will be used to
2137 * disambiguate multiple listeners that are the same
2138 * (e.g., you subscribe many object using a function
2139 * that lives on the prototype)
2140 * @return {boolean} true if the subscriber was found and detached.
2142 unsubscribe: function(p_type, p_fn, p_obj) {
2143 this.__yui_events = this.__yui_events || {};
2144 var evts = this.__yui_events;
2146 var ce = evts[p_type];
2148 return ce.unsubscribe(p_fn, p_obj);
2152 for (var i in evts) {
2153 if (YAHOO.lang.hasOwnProperty(evts, i)) {
2154 ret = ret && evts[i].unsubscribe(p_fn, p_obj);
2164 * Removes all listeners from the specified event. If the event type
2165 * is not specified, all listeners from all hosted custom events will
2167 * @method unsubscribeAll
2168 * @param p_type {string} The type, or name of the event
2170 unsubscribeAll: function(p_type) {
2171 return this.unsubscribe(p_type);
2175 * Creates a new custom event of the specified type. If a custom event
2176 * by that name already exists, it will not be re-created. In either
2177 * case the custom event is returned.
2179 * @method createEvent
2181 * @param p_type {string} the type, or name of the event
2182 * @param p_config {object} optional config params. Valid properties are:
2186 * scope: defines the default execution scope. If not defined
2187 * the default scope will be this instance.
2190 * silent: if true, the custom event will not generate log messages.
2191 * This is false by default.
2194 * fireOnce: if true, the custom event will only notify subscribers
2195 * once regardless of the number of times the event is fired. In
2196 * addition, new subscribers will be executed immediately if the
2197 * event has already fired.
2198 * This is false by default.
2201 * onSubscribeCallback: specifies a callback to execute when the
2202 * event has a new subscriber. This will fire immediately for
2203 * each queued subscriber if any exist prior to the creation of
2208 * @return {CustomEvent} the custom event
2211 createEvent: function(p_type, p_config) {
2213 this.__yui_events = this.__yui_events || {};
2214 var opts = p_config || {},
2215 events = this.__yui_events, ce;
2217 if (events[p_type]) {
2218 YAHOO.log("EventProvider createEvent skipped: '"+p_type+"' already exists");
2221 ce = new YAHOO.util.CustomEvent(p_type, opts.scope || this, opts.silent,
2222 YAHOO.util.CustomEvent.FLAT, opts.fireOnce);
2224 events[p_type] = ce;
2226 if (opts.onSubscribeCallback) {
2227 ce.subscribeEvent.subscribe(opts.onSubscribeCallback);
2230 this.__yui_subscribers = this.__yui_subscribers || {};
2231 var qs = this.__yui_subscribers[p_type];
2234 for (var i=0; i<qs.length; ++i) {
2235 ce.subscribe(qs[i].fn, qs[i].obj, qs[i].overrideContext);
2240 return events[p_type];
2245 * Fire a custom event by name. The callback functions will be executed
2246 * from the scope specified when the event was created, and with the
2247 * following parameters:
2249 * <li>The first argument fire() was executed with</li>
2250 * <li>The custom object (if any) that was passed into the subscribe()
2254 * @param p_type {string} the type, or name of the event
2255 * @param arguments {Object*} an arbitrary set of parameters to pass to
2257 * @return {boolean} the return value from CustomEvent.fire
2260 fireEvent: function(p_type) {
2262 this.__yui_events = this.__yui_events || {};
2263 var ce = this.__yui_events[p_type];
2266 YAHOO.log(p_type + "event fired before it was created.");
2271 for (var i=1; i<arguments.length; ++i) {
2272 args.push(arguments[i]);
2274 return ce.fire.apply(ce, args);
2278 * Returns true if the custom event of the provided type has been created
2281 * @param type {string} the type, or name of the event
2283 hasEvent: function(type) {
2284 if (this.__yui_events) {
2285 if (this.__yui_events[type]) {
2296 var Event = YAHOO.util.Event, Lang = YAHOO.lang;
2299 * KeyListener is a utility that provides an easy interface for listening for
2300 * keydown/keyup events fired against DOM elements.
2301 * @namespace YAHOO.util
2302 * @class KeyListener
2304 * @param {HTMLElement} attachTo The element or element ID to which the key
2305 * event should be attached
2306 * @param {String} attachTo The element or element ID to which the key
2307 * event should be attached
2308 * @param {Object} keyData The object literal representing the key(s)
2309 * to detect. Possible attributes are
2310 * shift(boolean), alt(boolean), ctrl(boolean)
2311 * and keys(either an int or an array of ints
2312 * representing keycodes).
2313 * @param {Function} handler The CustomEvent handler to fire when the
2314 * key event is detected
2315 * @param {Object} handler An object literal representing the handler.
2316 * @param {String} event Optional. The event (keydown or keyup) to
2317 * listen for. Defaults automatically to keydown.
2319 * @knownissue the "keypress" event is completely broken in Safari 2.x and below.
2320 * the workaround is use "keydown" for key listening. However, if
2321 * it is desired to prevent the default behavior of the keystroke,
2322 * that can only be done on the keypress event. This makes key
2323 * handling quite ugly.
2324 * @knownissue keydown is also broken in Safari 2.x and below for the ESC key.
2325 * There currently is no workaround other than choosing another
2326 * key to listen for.
2328 YAHOO.util.KeyListener = function(attachTo, keyData, handler, event) {
2330 YAHOO.log("No attachTo element specified", "error");
2331 } else if (!keyData) {
2332 YAHOO.log("No keyData specified", "error");
2333 } else if (!handler) {
2334 YAHOO.log("No handler specified", "error");
2338 event = YAHOO.util.KeyListener.KEYDOWN;
2342 * The CustomEvent fired internally when a key is pressed
2345 * @param {Object} keyData The object literal representing the key(s) to
2346 * detect. Possible attributes are shift(boolean),
2347 * alt(boolean), ctrl(boolean) and keys(either an
2348 * int or an array of ints representing keycodes).
2350 var keyEvent = new YAHOO.util.CustomEvent("keyPressed");
2353 * The CustomEvent fired when the KeyListener is enabled via the enable()
2355 * @event enabledEvent
2356 * @param {Object} keyData The object literal representing the key(s) to
2357 * detect. Possible attributes are shift(boolean),
2358 * alt(boolean), ctrl(boolean) and keys(either an
2359 * int or an array of ints representing keycodes).
2361 this.enabledEvent = new YAHOO.util.CustomEvent("enabled");
2364 * The CustomEvent fired when the KeyListener is disabled via the
2365 * disable() function
2366 * @event disabledEvent
2367 * @param {Object} keyData The object literal representing the key(s) to
2368 * detect. Possible attributes are shift(boolean),
2369 * alt(boolean), ctrl(boolean) and keys(either an
2370 * int or an array of ints representing keycodes).
2372 this.disabledEvent = new YAHOO.util.CustomEvent("disabled");
2374 if (Lang.isString(attachTo)) {
2375 attachTo = document.getElementById(attachTo); // No Dom util
2378 if (Lang.isFunction(handler)) {
2379 keyEvent.subscribe(handler);
2381 keyEvent.subscribe(handler.fn, handler.scope, handler.correctScope);
2385 * Handles the key event when a key is pressed.
2386 * @method handleKeyPress
2387 * @param {DOMEvent} e The keypress DOM event
2388 * @param {Object} obj The DOM event scope object
2391 function handleKeyPress(e, obj) {
2392 if (! keyData.shift) {
2393 keyData.shift = false;
2395 if (! keyData.alt) {
2396 keyData.alt = false;
2398 if (! keyData.ctrl) {
2399 keyData.ctrl = false;
2402 // check held down modifying keys first
2403 if (e.shiftKey == keyData.shift &&
2404 e.altKey == keyData.alt &&
2405 e.ctrlKey == keyData.ctrl) { // if we pass this, all modifiers match
2407 var dataItem, keys = keyData.keys, key;
2409 if (YAHOO.lang.isArray(keys)) {
2410 for (var i=0;i<keys.length;i++) {
2412 key = Event.getCharCode(e);
2414 if (dataItem == key) {
2415 keyEvent.fire(key, e);
2420 key = Event.getCharCode(e);
2422 keyEvent.fire(key, e);
2429 * Enables the KeyListener by attaching the DOM event listeners to the
2430 * target DOM element
2433 this.enable = function() {
2434 if (! this.enabled) {
2435 Event.on(attachTo, event, handleKeyPress);
2436 this.enabledEvent.fire(keyData);
2439 * Boolean indicating the enabled/disabled state of the Tooltip
2443 this.enabled = true;
2447 * Disables the KeyListener by removing the DOM event listeners from the
2448 * target DOM element
2451 this.disable = function() {
2453 Event.removeListener(attachTo, event, handleKeyPress);
2454 this.disabledEvent.fire(keyData);
2456 this.enabled = false;
2460 * Returns a String representation of the object.
2462 * @return {String} The string representation of the KeyListener
2464 this.toString = function() {
2465 return "KeyListener [" + keyData.keys + "] " + attachTo.tagName +
2466 (attachTo.id ? "[" + attachTo.id + "]" : "");
2471 var KeyListener = YAHOO.util.KeyListener;
2474 * Constant representing the DOM "keydown" event.
2475 * @property YAHOO.util.KeyListener.KEYDOWN
2480 KeyListener.KEYDOWN = "keydown";
2483 * Constant representing the DOM "keyup" event.
2484 * @property YAHOO.util.KeyListener.KEYUP
2489 KeyListener.KEYUP = "keyup";
2492 * keycode constants for a subset of the special keys
2524 YAHOO.register("event", YAHOO.util.Event, {version: "2.8.0r4", build: "2449"});