/**
* The Event Utility provides utilities for managing DOM Events and tools
* for building event systems
*
* @module event
* @title Event Utility
* @namespace YAHOO.util
* @requires yahoo
*/
// The first instance of Event will win if it is loaded more than once.
// @TODO this needs to be changed so that only the state data that needs to
// be preserved is kept, while methods are overwritten/added as needed.
// This means that the module pattern can't be used.
if (!YAHOO.util.Event) {
/**
* The event utility provides functions to add and remove event listeners,
* event cleansing. It also tries to automatically remove listeners it
* registers during the unload event.
*
* @class Event
* @static
*/
YAHOO.util.Event = function() {
/**
* True after the onload event has fired
* @property loadComplete
* @type boolean
* @static
* @private
*/
var loadComplete = false,
/**
* Cache of wrapped listeners
* @property listeners
* @type array
* @static
* @private
*/
listeners = [],
/**
* User-defined unload function that will be fired before all events
* are detached
* @property unloadListeners
* @type array
* @static
* @private
*/
unloadListeners = [],
/**
* The number of times to poll after window.onload. This number is
* increased if additional late-bound handlers are requested after
* the page load.
* @property retryCount
* @static
* @private
*/
retryCount = 0,
/**
* onAvailable listeners
* @property onAvailStack
* @static
* @private
*/
onAvailStack = [],
/**
* Counter for auto id generation
* @property counter
* @static
* @private
*/
counter = 0,
/**
* Normalized keycodes for webkit/safari
* @property webkitKeymap
* @type {int: int}
* @private
* @static
* @final
*/
webkitKeymap = {
63232: 38, // up
63233: 40, // down
63234: 37, // left
63235: 39, // right
63276: 33, // page up
63277: 34, // page down
25: 9 // SHIFT-TAB (Safari provides a different key code in
// this case, even though the shiftKey modifier is set)
},
isIE = YAHOO.env.ua.ie,
// String constants used by the addFocusListener and removeFocusListener methods
FOCUSIN = "focusin",
FOCUSOUT = "focusout";
return {
/**
* The number of times we should look for elements that are not
* in the DOM at the time the event is requested after the document
* has been loaded. The default is 500@amp;40 ms, so it will poll
* for 20 seconds or until all outstanding handlers are bound
* (whichever comes first).
* @property POLL_RETRYS
* @type int
* @static
* @final
*/
POLL_RETRYS: 500,
/**
* The poll interval in milliseconds
* @property POLL_INTERVAL
* @type int
* @static
* @final
*/
POLL_INTERVAL: 40,
/**
* Element to bind, int constant
* @property EL
* @type int
* @static
* @final
*/
EL: 0,
/**
* Type of event, int constant
* @property TYPE
* @type int
* @static
* @final
*/
TYPE: 1,
/**
* Function to execute, int constant
* @property FN
* @type int
* @static
* @final
*/
FN: 2,
/**
* Function wrapped for context correction and cleanup, int constant
* @property WFN
* @type int
* @static
* @final
*/
WFN: 3,
/**
* Object passed in by the user that will be returned as a
* parameter to the callback, int constant. Specific to
* unload listeners
* @property OBJ
* @type int
* @static
* @final
*/
UNLOAD_OBJ: 3,
/**
* Adjusted context, either the element we are registering the event
* on or the custom object passed in by the listener, int constant
* @property ADJ_SCOPE
* @type int
* @static
* @final
*/
ADJ_SCOPE: 4,
/**
* The original obj passed into addListener
* @property OBJ
* @type int
* @static
* @final
*/
OBJ: 5,
/**
* The original context parameter passed into addListener
* @property OVERRIDE
* @type int
* @static
* @final
*/
OVERRIDE: 6,
/**
* The original capture parameter passed into addListener
* @property CAPTURE
* @type int
* @static
* @final
*/
CAPTURE: 7,
/**
* addListener/removeListener can throw errors in unexpected scenarios.
* These errors are suppressed, the method returns false, and this property
* is set
* @property lastError
* @static
* @type Error
*/
lastError: null,
/**
* Safari detection
* @property isSafari
* @private
* @static
* @deprecated use YAHOO.env.ua.webkit
*/
isSafari: YAHOO.env.ua.webkit,
/**
* webkit version
* @property webkit
* @type string
* @private
* @static
* @deprecated use YAHOO.env.ua.webkit
*/
webkit: YAHOO.env.ua.webkit,
/**
* IE detection
* @property isIE
* @private
* @static
* @deprecated use YAHOO.env.ua.ie
*/
isIE: isIE,
/**
* poll handle
* @property _interval
* @static
* @private
*/
_interval: null,
/**
* document readystate poll handle
* @property _dri
* @static
* @private
*/
_dri: null,
/**
* Map of special event types
* @property _specialTypes
* @static
* @private
*/
_specialTypes: {
focusin: (isIE ? "focusin" : "focus"),
focusout: (isIE ? "focusout" : "blur")
},
/**
* True when the document is initially usable
* @property DOMReady
* @type boolean
* @static
*/
DOMReady: false,
/**
* Errors thrown by subscribers of custom events are caught
* and the error message is written to the debug console. If
* this property is set to true, it will also re-throw the
* error.
* @property throwErrors
* @type boolean
* @default false
*/
throwErrors: false,
/**
* @method startInterval
* @static
* @private
*/
startInterval: function() {
if (!this._interval) {
// var self = this;
// var callback = function() { self._tryPreloadAttach(); };
// this._interval = setInterval(callback, this.POLL_INTERVAL);
this._interval = YAHOO.lang.later(this.POLL_INTERVAL, this, this._tryPreloadAttach, null, true);
}
},
/**
* Executes the supplied callback when the item with the supplied
* id is found. This is meant to be used to execute behavior as
* soon as possible as the page loads. If you use this after the
* initial page load it will poll for a fixed time for the element.
* The number of times it will poll and the frequency are
* configurable. By default it will poll for 10 seconds.
*
* <p>The callback is executed with a single parameter:
* the custom object parameter, if provided.</p>
*
* @method onAvailable
*
* @param {string||string[]} id the id of the element, or an array
* of ids to look for.
* @param {function} fn what to execute when the element is found.
* @param {object} obj an optional object to be passed back as
* a parameter to fn.
* @param {boolean|object} overrideContext If set to true, fn will execute
* in the context of obj, if set to an object it
* will execute in the context of that object
* @param checkContent {boolean} check child node readiness (onContentReady)
* @static
*/
onAvailable: function(id, fn, obj, overrideContext, checkContent) {
var a = (YAHOO.lang.isString(id)) ? [id] : id;
for (var i=0; i<a.length; i=i+1) {
onAvailStack.push({id: a[i],
fn: fn,
obj: obj,
overrideContext: overrideContext,
checkReady: checkContent });
}
retryCount = this.POLL_RETRYS;
this.startInterval();
},
/**
* Works the same way as onAvailable, but additionally checks the
* state of sibling elements to determine if the content of the
* available element is safe to modify.
*
* <p>The callback is executed with a single parameter:
* the custom object parameter, if provided.</p>
*
* @method onContentReady
*
* @param {string} id the id of the element to look for.
* @param {function} fn what to execute when the element is ready.
* @param {object} obj an optional object to be passed back as
* a parameter to fn.
* @param {boolean|object} overrideContext If set to true, fn will execute
* in the context of obj. If an object, fn will
* exectute in the context of that object
*
* @static
*/
onContentReady: function(id, fn, obj, overrideContext) {
this.onAvailable(id, fn, obj, overrideContext, true);
},
/**
* Executes the supplied callback when the DOM is first usable. This
* will execute immediately if called after the DOMReady event has
* fired. @todo the DOMContentReady event does not fire when the
* script is dynamically injected into the page. This means the
* DOMReady custom event will never fire in FireFox or Opera when the
* library is injected. It _will_ fire in Safari, and the IE
* implementation would allow for us to fire it if the defered script
* is not available. We want this to behave the same in all browsers.
* Is there a way to identify when the script has been injected
* instead of included inline? Is there a way to know whether the
* window onload event has fired without having had a listener attached
* to it when it did so?
*
* <p>The callback is a CustomEvent, so the signature is:</p>
* <p>type <string>, args <array>, customobject <object></p>
* <p>For DOMReady events, there are no fire argments, so the
* signature is:</p>
* <p>"DOMReady", [], obj</p>
*
*
* @method onDOMReady
*
* @param {function} fn what to execute when the element is found.
* @param {object} obj an optional object to be passed back as
* a parameter to fn.
* @param {boolean|object} overrideContext If set to true, fn will execute
* in the context of obj, if set to an object it
* will execute in the context of that object
*
* @static
*/
// onDOMReady: function(fn, obj, overrideContext) {
onDOMReady: function() {
this.DOMReadyEvent.subscribe.apply(this.DOMReadyEvent, arguments);
},
/**
* Appends an event handler
*
* @method _addListener
*
* @param {String|HTMLElement|Array|NodeList} el An id, an element
* reference, or a collection of ids and/or elements to assign the
* listener to.
* @param {String} sType The type of event to append
* @param {Function} fn The method the event invokes
* @param {Object} obj An arbitrary object that will be
* passed as a parameter to the handler
* @param {Boolean|object} overrideContext If true, the obj passed in becomes
* the execution context of the listener. If an
* object, this object becomes the execution
* context.
* @param {boolen} capture capture or bubble phase
* @return {Boolean} True if the action was successful or defered,
* false if one or more of the elements
* could not have the listener attached,
* or if the operation throws an exception.
* @private
* @static
*/
_addListener: function(el, sType, fn, obj, overrideContext, bCapture) {
if (!fn || !fn.call) {
YAHOO.log(sType + " addListener failed, invalid callback", "error", "Event");
return false;
}
// The el argument can be an array of elements or element ids.
if ( this._isValidCollection(el)) {
var ok = true;
for (var i=0,len=el.length; i<len; ++i) {
ok = this.on(el[i],
sType,
fn,
obj,
overrideContext) && ok;
}
return ok;
} else if (YAHOO.lang.isString(el)) {
var oEl = this.getEl(el);
// If the el argument is a string, we assume it is
// actually the id of the element. If the page is loaded
// we convert el to the actual element, otherwise we
// defer attaching the event until onload event fires
// check to see if we need to delay hooking up the event
// until after the page loads.
if (oEl) {
el = oEl;
} else {
// defer adding the event until the element is available
this.onAvailable(el, function() {
YAHOO.util.Event._addListener(el, sType, fn, obj, overrideContext, bCapture);
});
return true;
}
}
// Element should be an html element or an array if we get
// here.
if (!el) {
// this.logger.debug("unable to attach event " + sType);
return false;
}
// we need to make sure we fire registered unload events
// prior to automatically unhooking them. So we hang on to
// these instead of attaching them to the window and fire the
// handles explicitly during our one unload event.
if ("unload" == sType && obj !== this) {
unloadListeners[unloadListeners.length] =
[el, sType, fn, obj, overrideContext];
return true;
}
// this.logger.debug("Adding handler: " + el + ", " + sType);
// if the user chooses to override the context, we use the custom
// object passed in, otherwise the executing context will be the
// HTML element that the event is registered on
var context = el;
if (overrideContext) {
if (overrideContext === true) {
context = obj;
} else {
context = overrideContext;
}
}
// wrap the function so we can return the obj object when
// the event fires;
var wrappedFn = function(e) {
return fn.call(context, YAHOO.util.Event.getEvent(e, el),
obj);
};
var li = [el, sType, fn, wrappedFn, context, obj, overrideContext, bCapture];
var index = listeners.length;
// cache the listener so we can try to automatically unload
listeners[index] = li;
try {
this._simpleAdd(el, sType, wrappedFn, bCapture);
} catch(ex) {
// handle an error trying to attach an event. If it fails
// we need to clean up the cache
this.lastError = ex;
this.removeListener(el, sType, fn);
return false;
}
return true;
},
/**
* Checks to see if the type requested is a special type
* (as defined by the _specialTypes hash), and (if so) returns
* the special type name.
*
* @method _getType
*
* @param {String} sType The type to look up
* @private
*/
_getType: function (type) {
return this._specialTypes[type] || type;
},
/**
* Appends an event handler
*
* @method addListener
*
* @param {String|HTMLElement|Array|NodeList} el An id, an element
* reference, or a collection of ids and/or elements to assign the
* listener to.
* @param {String} sType The type of event to append
* @param {Function} fn The method the event invokes
* @param {Object} obj An arbitrary object that will be
* passed as a parameter to the handler
* @param {Boolean|object} overrideContext If true, the obj passed in becomes
* the execution context of the listener. If an
* object, this object becomes the execution
* context.
* @return {Boolean} True if the action was successful or defered,
* false if one or more of the elements
* could not have the listener attached,
* or if the operation throws an exception.
* @static
*/
addListener: function (el, sType, fn, obj, overrideContext) {
var capture = ((sType == FOCUSIN || sType == FOCUSOUT) && !YAHOO.env.ua.ie) ? true : false;
return this._addListener(el, this._getType(sType), fn, obj, overrideContext, capture);
},
/**
* Attaches a focusin event listener to the specified element for
* the purpose of listening for the focus event on the element's
* descendants.
* @method addFocusListener
*
* @param {String|HTMLElement|Array|NodeList} el An id, an element
* reference, or a collection of ids and/or elements to assign the
* listener to.
* @param {Function} fn The method the event invokes
* @param {Object} obj An arbitrary object that will be
* passed as a parameter to the handler
* @param {Boolean|object} overrideContext If true, the obj passed in becomes
* the execution context of the listener. If an
* object, this object becomes the execution
* context.
* @return {Boolean} True if the action was successful or defered,
* false if one or more of the elements
* could not have the listener attached,
* or if the operation throws an exception.
* @static
* @deprecated use YAHOO.util.Event.on and specify "focusin" as the event type.
*/
addFocusListener: function (el, fn, obj, overrideContext) {
return this.on(el, FOCUSIN, fn, obj, overrideContext);
},
/**
* Removes a focusin event listener to the specified element for
* the purpose of listening for the focus event on the element's
* descendants.
*
* @method removeFocusListener
*
* @param {String|HTMLElement|Array|NodeList} el An id, an element
* reference, or a collection of ids and/or elements to remove
* the listener from.
* @param {Function} fn the method the event invokes. If fn is
* undefined, then all event handlers for the type of event are
* removed.
* @return {boolean} true if the unbind was successful, false
* otherwise.
* @static
* @deprecated use YAHOO.util.Event.removeListener and specify "focusin" as the event type.
*/
removeFocusListener: function (el, fn) {
return this.removeListener(el, FOCUSIN, fn);
},
/**
* Attaches a focusout event listener to the specified element for
* the purpose of listening for the blur event on the element's
* descendants.
*
* @method addBlurListener
*
* @param {String|HTMLElement|Array|NodeList} el An id, an element
* reference, or a collection of ids and/or elements to assign the
* listener to.
* @param {Function} fn The method the event invokes
* @param {Object} obj An arbitrary object that will be
* passed as a parameter to the handler
* @param {Boolean|object} overrideContext If true, the obj passed in becomes
* the execution context of the listener. If an
* object, this object becomes the execution
* context.
* @return {Boolean} True if the action was successful or defered,
* false if one or more of the elements
* could not have the listener attached,
* or if the operation throws an exception.
* @static
* @deprecated use YAHOO.util.Event.on and specify "focusout" as the event type.
*/
addBlurListener: function (el, fn, obj, overrideContext) {
return this.on(el, FOCUSOUT, fn, obj, overrideContext);
},
/**
* Removes a focusout event listener to the specified element for
* the purpose of listening for the blur event on the element's
* descendants.
*
* @method removeBlurListener
*
* @param {String|HTMLElement|Array|NodeList} el An id, an element
* reference, or a collection of ids and/or elements to remove
* the listener from.
* @param {Function} fn the method the event invokes. If fn is
* undefined, then all event handlers for the type of event are
* removed.
* @return {boolean} true if the unbind was successful, false
* otherwise.
* @static
* @deprecated use YAHOO.util.Event.removeListener and specify "focusout" as the event type.
*/
removeBlurListener: function (el, fn) {
return this.removeListener(el, FOCUSOUT, fn);
},
/**
* Removes an event listener
*
* @method removeListener
*
* @param {String|HTMLElement|Array|NodeList} el An id, an element
* reference, or a collection of ids and/or elements to remove
* the listener from.
* @param {String} sType the type of event to remove.
* @param {Function} fn the method the event invokes. If fn is
* undefined, then all event handlers for the type of event are
* removed.
* @return {boolean} true if the unbind was successful, false
* otherwise.
* @static
*/
removeListener: function(el, sType, fn) {
var i, len, li;
sType = this._getType(sType);
// The el argument can be a string
if (typeof el == "string") {
el = this.getEl(el);
// The el argument can be an array of elements or element ids.
} else if ( this._isValidCollection(el)) {
var ok = true;
for (i=el.length-1; i>-1; i--) {
ok = ( this.removeListener(el[i], sType, fn) && ok );
}
return ok;
}
if (!fn || !fn.call) {
// this.logger.debug("Error, function is not valid " + fn);
//return false;
return this.purgeElement(el, false, sType);
}
if ("unload" == sType) {
for (i=unloadListeners.length-1; i>-1; i--) {
li = unloadListeners[i];
if (li &&
li[0] == el &&
li[1] == sType &&
li[2] == fn) {
unloadListeners.splice(i, 1);
// unloadListeners[i]=null;
return true;
}
}
return false;
}
var cacheItem = null;
// The index is a hidden parameter; needed to remove it from
// the method signature because it was tempting users to
// try and take advantage of it, which is not possible.
var index = arguments[3];
if ("undefined" === typeof index) {
index = this._getCacheIndex(listeners, el, sType, fn);
}
if (index >= 0) {
cacheItem = listeners[index];
}
if (!el || !cacheItem) {
// this.logger.debug("cached listener not found");
return false;
}
// this.logger.debug("Removing handler: " + el + ", " + sType);
var bCapture = cacheItem[this.CAPTURE] === true ? true : false;
try {
this._simpleRemove(el, sType, cacheItem[this.WFN], bCapture);
} catch(ex) {
this.lastError = ex;
return false;
}
// removed the wrapped handler
delete listeners[index][this.WFN];
delete listeners[index][this.FN];
listeners.splice(index, 1);
// listeners[index]=null;
return true;
},
/**
* Returns the event's target element. Safari sometimes provides
* a text node, and this is automatically resolved to the text
* node's parent so that it behaves like other browsers.
* @method getTarget
* @param {Event} ev the event
* @param {boolean} resolveTextNode when set to true the target's
* parent will be returned if the target is a
* text node. @deprecated, the text node is
* now resolved automatically
* @return {HTMLElement} the event's target
* @static
*/
getTarget: function(ev, resolveTextNode) {
var t = ev.target || ev.srcElement;
return this.resolveTextNode(t);
},
/**
* In some cases, some browsers will return a text node inside
* the actual element that was targeted. This normalizes the
* return value for getTarget and getRelatedTarget.
*
* If accessing a property of the node throws an error, this is
* probably the anonymous div wrapper Gecko adds inside text
* nodes. This likely will only occur when attempting to access
* the relatedTarget. In this case, we now return null because
* the anonymous div is completely useless and we do not know
* what the related target was because we can't even get to
* the element's parent node.
*
* @method resolveTextNode
* @param {HTMLElement} node node to resolve
* @return {HTMLElement} the normized node
* @static
*/
resolveTextNode: function(n) {
try {
if (n && 3 == n.nodeType) {
return n.parentNode;
}
} catch(e) {
return null;
}
return n;
},
/**
* Returns the event's pageX
* @method getPageX
* @param {Event} ev the event
* @return {int} the event's pageX
* @static
*/
getPageX: function(ev) {
var x = ev.pageX;
if (!x && 0 !== x) {
x = ev.clientX || 0;
if ( this.isIE ) {
x += this._getScrollLeft();
}
}
return x;
},
/**
* Returns the event's pageY
* @method getPageY
* @param {Event} ev the event
* @return {int} the event's pageY
* @static
*/
getPageY: function(ev) {
var y = ev.pageY;
if (!y && 0 !== y) {
y = ev.clientY || 0;
if ( this.isIE ) {
y += this._getScrollTop();
}
}
return y;
},
/**
* Returns the pageX and pageY properties as an indexed array.
* @method getXY
* @param {Event} ev the event
* @return {[x, y]} the pageX and pageY properties of the event
* @static
*/
getXY: function(ev) {
return [this.getPageX(ev), this.getPageY(ev)];
},
/**
* Returns the event's related target
* @method getRelatedTarget
* @param {Event} ev the event
* @return {HTMLElement} the event's relatedTarget
* @static
*/
getRelatedTarget: function(ev) {
var t = ev.relatedTarget;
if (!t) {
if (ev.type == "mouseout") {
t = ev.toElement;
} else if (ev.type == "mouseover") {
t = ev.fromElement;
}
}
return this.resolveTextNode(t);
},
/**
* Returns the time of the event. If the time is not included, the
* event is modified using the current time.
* @method getTime
* @param {Event} ev the event
* @return {Date} the time of the event
* @static
*/
getTime: function(ev) {
if (!ev.time) {
var t = new Date().getTime();
try {
ev.time = t;
} catch(ex) {
this.lastError = ex;
return t;
}
}
return ev.time;
},
/**
* Convenience method for stopPropagation + preventDefault
* @method stopEvent
* @param {Event} ev the event
* @static
*/
stopEvent: function(ev) {
this.stopPropagation(ev);
this.preventDefault(ev);
},
/**
* Stops event propagation
* @method stopPropagation
* @param {Event} ev the event
* @static
*/
stopPropagation: function(ev) {
if (ev.stopPropagation) {
ev.stopPropagation();
} else {
ev.cancelBubble = true;
}
},
/**
* Prevents the default behavior of the event
* @method preventDefault
* @param {Event} ev the event
* @static
*/
preventDefault: function(ev) {
if (ev.preventDefault) {
ev.preventDefault();
} else {
ev.returnValue = false;
}
},
/**
* Finds the event in the window object, the caller's arguments, or
* in the arguments of another method in the callstack. This is
* executed automatically for events registered through the event
* manager, so the implementer should not normally need to execute
* this function at all.
* @method getEvent
* @param {Event} e the event parameter from the handler
* @param {HTMLElement} boundEl the element the listener is attached to
* @return {Event} the event
* @static
*/
getEvent: function(e, boundEl) {
var ev = e || window.event;
if (!ev) {
var c = this.getEvent.caller;
while (c) {
ev = c.arguments[0];
if (ev && Event == ev.constructor) {
break;
}
c = c.caller;
}
}
return ev;
},
/**
* Returns the charcode for an event
* @method getCharCode
* @param {Event} ev the event
* @return {int} the event's charCode
* @static
*/
getCharCode: function(ev) {
var code = ev.keyCode || ev.charCode || 0;
// webkit key normalization
if (YAHOO.env.ua.webkit && (code in webkitKeymap)) {
code = webkitKeymap[code];
}
return code;
},
/**
* Locating the saved event handler data by function ref
*
* @method _getCacheIndex
* @static
* @private
*/
_getCacheIndex: function(a, el, sType, fn) {
for (var i=0, l=a.length; i<l; i=i+1) {
var li = a[i];
if ( li &&
li[this.FN] == fn &&
li[this.EL] == el &&
li[this.TYPE] == sType ) {
return i;
}
}
return -1;
},
/**
* Generates an unique ID for the element if it does not already
* have one.
* @method generateId
* @param el the element to create the id for
* @return {string} the resulting id of the element
* @static
*/
generateId: function(el) {
var id = el.id;
if (!id) {
id = "yuievtautoid-" + counter;
++counter;
el.id = id;
}
return id;
},
/**
* We want to be able to use getElementsByTagName as a collection
* to attach a group of events to. Unfortunately, different
* browsers return different types of collections. This function
* tests to determine if the object is array-like. It will also
* fail if the object is an array, but is empty.
* @method _isValidCollection
* @param o the object to test
* @return {boolean} true if the object is array-like and populated
* @static
* @private
*/
_isValidCollection: function(o) {
try {
return ( o && // o is something
typeof o !== "string" && // o is not a string
o.length && // o is indexed
!o.tagName && // o is not an HTML element
!o.alert && // o is not a window
typeof o[0] !== "undefined" );
} catch(ex) {
YAHOO.log("node access error (xframe?)", "warn");
return false;
}
},
/**
* @private
* @property elCache
* DOM element cache
* @static
* @deprecated Elements are not cached due to issues that arise when
* elements are removed and re-added
*/
elCache: {},
/**
* We cache elements bound by id because when the unload event
* fires, we can no longer use document.getElementById
* @method getEl
* @static
* @private
* @deprecated Elements are not cached any longer
*/
getEl: function(id) {
return (typeof id === "string") ? document.getElementById(id) : id;
},
/**
* Clears the element cache
* @deprecated Elements are not cached any longer
* @method clearCache
* @static
* @private
*/
clearCache: function() { },
/**
* Custom event the fires when the dom is initially usable
* @event DOMReadyEvent
*/
DOMReadyEvent: new YAHOO.util.CustomEvent("DOMReady", YAHOO, 0, 0, 1),
/**
* hook up any deferred listeners
* @method _load
* @static
* @private
*/
_load: function(e) {
if (!loadComplete) {
loadComplete = true;
var EU = YAHOO.util.Event;
// Just in case DOMReady did not go off for some reason
EU._ready();
// Available elements may not have been detected before the
// window load event fires. Try to find them now so that the
// the user is more likely to get the onAvailable notifications
// before the window load notification
EU._tryPreloadAttach();
}
},
/**
* Fires the DOMReady event listeners the first time the document is
* usable.
* @method _ready
* @static
* @private
*/
_ready: function(e) {
var EU = YAHOO.util.Event;
if (!EU.DOMReady) {
EU.DOMReady=true;
// Fire the content ready custom event
EU.DOMReadyEvent.fire();
// Remove the DOMContentLoaded (FF/Opera)
EU._simpleRemove(document, "DOMContentLoaded", EU._ready);
}
},
/**
* Polling function that runs before the onload event fires,
* attempting to attach to DOM Nodes as soon as they are
* available
* @method _tryPreloadAttach
* @static
* @private
*/
_tryPreloadAttach: function() {
if (onAvailStack.length === 0) {
retryCount = 0;
if (this._interval) {
// clearInterval(this._interval);
this._interval.cancel();
this._interval = null;
}
return;
}
if (this.locked) {
return;
}
if (this.isIE) {
// Hold off if DOMReady has not fired and check current
// readyState to protect against the IE operation aborted
// issue.
if (!this.DOMReady) {
this.startInterval();
return;
}
}
this.locked = true;
// this.logger.debug("tryPreloadAttach");
// keep trying until after the page is loaded. We need to
// check the page load state prior to trying to bind the
// elements so that we can be certain all elements have been
// tested appropriately
var tryAgain = !loadComplete;
if (!tryAgain) {
tryAgain = (retryCount > 0 && onAvailStack.length > 0);
}
// onAvailable
var notAvail = [];
var executeItem = function (el, item) {
var context = el;
if (item.overrideContext) {
if (item.overrideContext === true) {
context = item.obj;
} else {
context = item.overrideContext;
}
}
item.fn.call(context, item.obj);
};
var i, len, item, el, ready=[];
// onAvailable onContentReady
for (i=0, len=onAvailStack.length; i<len; i=i+1) {
item = onAvailStack[i];
if (item) {
el = this.getEl(item.id);
if (el) {
if (item.checkReady) {
if (loadComplete || el.nextSibling || !tryAgain) {
ready.push(item);
onAvailStack[i] = null;
}
} else {
executeItem(el, item);
onAvailStack[i] = null;
}
} else {
notAvail.push(item);
}
}
}
// make sure onContentReady fires after onAvailable
for (i=0, len=ready.length; i<len; i=i+1) {
item = ready[i];
executeItem(this.getEl(item.id), item);
}
retryCount--;
if (tryAgain) {
for (i=onAvailStack.length-1; i>-1; i--) {
item = onAvailStack[i];
if (!item || !item.id) {
onAvailStack.splice(i, 1);
}
}
this.startInterval();
} else {
if (this._interval) {
// clearInterval(this._interval);
this._interval.cancel();
this._interval = null;
}
}
this.locked = false;
},
/**
* Removes all listeners attached to the given element via addListener.
* Optionally, the node's children can also be purged.
* Optionally, you can specify a specific type of event to remove.
* @method purgeElement
* @param {HTMLElement} el the element to purge
* @param {boolean} recurse recursively purge this element's children
* as well. Use with caution.
* @param {string} sType optional type of listener to purge. If
* left out, all listeners will be removed
* @static
*/
purgeElement: function(el, recurse, sType) {
var oEl = (YAHOO.lang.isString(el)) ? this.getEl(el) : el;
var elListeners = this.getListeners(oEl, sType), i, len;
if (elListeners) {
for (i=elListeners.length-1; i>-1; i--) {
var l = elListeners[i];
this.removeListener(oEl, l.type, l.fn);
}
}
if (recurse && oEl && oEl.childNodes) {
for (i=0,len=oEl.childNodes.length; i<len ; ++i) {
this.purgeElement(oEl.childNodes[i], recurse, sType);
}
}
},
/**
* Returns all listeners attached to the given element via addListener.
* Optionally, you can specify a specific type of event to return.
* @method getListeners
* @param el {HTMLElement|string} the element or element id to inspect
* @param sType {string} optional type of listener to return. If
* left out, all listeners will be returned
* @return {Object} the listener. Contains the following fields:
* 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 context
* scope: (boolean) the derived context based on the adjust parameter
* index: (int) its position in the Event util listener cache
* @static
*/
getListeners: function(el, sType) {
var results=[], searchLists;
if (!sType) {
searchLists = [listeners, unloadListeners];
} else if (sType === "unload") {
searchLists = [unloadListeners];
} else {
sType = this._getType(sType);
searchLists = [listeners];
}
var oEl = (YAHOO.lang.isString(el)) ? this.getEl(el) : el;
for (var j=0;j<searchLists.length; j=j+1) {
var searchList = searchLists[j];
if (searchList) {
for (var i=0,len=searchList.length; i<len ; ++i) {
var l = searchList[i];
if ( l && l[this.EL] === oEl &&
(!sType || sType === l[this.TYPE]) ) {
results.push({
type: l[this.TYPE],
fn: l[this.FN],
obj: l[this.OBJ],
adjust: l[this.OVERRIDE],
scope: l[this.ADJ_SCOPE],
index: i
});
}
}
}
}
return (results.length) ? results : null;
},
/**
* Removes all listeners registered by pe.event. Called
* automatically during the unload event.
* @method _unload
* @static
* @private
*/
_unload: function(e) {
var EU = YAHOO.util.Event, i, j, l, len, index,
ul = unloadListeners.slice(), context;
// execute and clear stored unload listeners
for (i=0, len=unloadListeners.length; i<len; ++i) {
l = ul[i];
if (l) {
try {
context = window;
if (l[EU.ADJ_SCOPE]) {
if (l[EU.ADJ_SCOPE] === true) {
context = l[EU.UNLOAD_OBJ];
} else {
context = l[EU.ADJ_SCOPE];
}
}
l[EU.FN].call(context, EU.getEvent(e, l[EU.EL]), l[EU.UNLOAD_OBJ] );
} catch(e1) {}
ul[i] = null;
}
}
l = null;
context = null;
unloadListeners = null;
// Remove listeners to handle IE memory leaks
// 2.5.0 listeners are removed for all browsers again. FireFox preserves
// at least some listeners between page refreshes, potentially causing
// errors during page load (mouseover listeners firing before they
// should if the user moves the mouse at the correct moment).
if (listeners) {
for (j=listeners.length-1; j>-1; j--) {
l = listeners[j];
if (l) {
try {
EU.removeListener(l[EU.EL], l[EU.TYPE], l[EU.FN], j);
} catch(e2) {}
}
}
l=null;
}
try {
EU._simpleRemove(window, "unload", EU._unload);
EU._simpleRemove(window, "load", EU._load);
} catch(e3) {}
},
/**
* Returns scrollLeft
* @method _getScrollLeft
* @static
* @private
*/
_getScrollLeft: function() {
return this._getScroll()[1];
},
/**
* Returns scrollTop
* @method _getScrollTop
* @static
* @private
*/
_getScrollTop: function() {
return this._getScroll()[0];
},
/**
* Returns the scrollTop and scrollLeft. Used to calculate the
* pageX and pageY in Internet Explorer
* @method _getScroll
* @static
* @private
*/
_getScroll: function() {
var dd = document.documentElement, db = document.body;
if (dd && (dd.scrollTop || dd.scrollLeft)) {
return [dd.scrollTop, dd.scrollLeft];
} else if (db) {
return [db.scrollTop, db.scrollLeft];
} else {
return [0, 0];
}
},
/**
* Used by old versions of CustomEvent, restored for backwards
* compatibility
* @method regCE
* @private
* @static
* @deprecated still here for backwards compatibility
*/
regCE: function() {},
/**
* Adds a DOM event directly without the caching, cleanup, context adj, etc
*
* @method _simpleAdd
* @param {HTMLElement} el the element to bind the handler to
* @param {string} sType the type of event handler
* @param {function} fn the callback to invoke
* @param {boolen} capture capture or bubble phase
* @static
* @private
*/
_simpleAdd: function () {
if (window.addEventListener) {
return function(el, sType, fn, capture) {
el.addEventListener(sType, fn, (capture));
};
} else if (window.attachEvent) {
return function(el, sType, fn, capture) {
el.attachEvent("on" + sType, fn);
};
} else {
return function(){};
}
}(),
/**
* Basic remove listener
*
* @method _simpleRemove
* @param {HTMLElement} el the element to bind the handler to
* @param {string} sType the type of event handler
* @param {function} fn the callback to invoke
* @param {boolen} capture capture or bubble phase
* @static
* @private
*/
_simpleRemove: function() {
if (window.removeEventListener) {
return function (el, sType, fn, capture) {
el.removeEventListener(sType, fn, (capture));
};
} else if (window.detachEvent) {
return function (el, sType, fn) {
el.detachEvent("on" + sType, fn);
};
} else {
return function(){};
}
}()
};
}();
(function() {
var EU = YAHOO.util.Event;
/**
* Appends an event handler. This is an alias for <code>addListener</code>
*
* @method on
*
* @param {String|HTMLElement|Array|NodeList} el An id, an element
* reference, or a collection of ids and/or elements to assign the
* listener to.
* @param {String} sType The type of event to append
* @param {Function} fn The method the event invokes
* @param {Object} obj An arbitrary object that will be
* passed as a parameter to the handler
* @param {Boolean|object} overrideContext If true, the obj passed in becomes
* the execution context of the listener. If an
* object, this object becomes the execution
* context.
* @return {Boolean} True if the action was successful or defered,
* false if one or more of the elements
* could not have the listener attached,
* or if the operation throws an exception.
* @static
*/
EU.on = EU.addListener;
/**
* YAHOO.util.Event.onFocus is an alias for addFocusListener
* @method onFocus
* @see addFocusListener
* @static
* @deprecated use YAHOO.util.Event.on and specify "focusin" as the event type.
*/
EU.onFocus = EU.addFocusListener;
/**
* YAHOO.util.Event.onBlur is an alias for addBlurListener
* @method onBlur
* @see addBlurListener
* @static
* @deprecated use YAHOO.util.Event.on and specify "focusout" as the event type.
*/
EU.onBlur = EU.addBlurListener;
/*! DOMReady: based on work by: Dean Edwards/John Resig/Matthias Miller/Diego Perini */
// Internet Explorer: use the readyState of a defered script.
// This isolates what appears to be a safe moment to manipulate
// the DOM prior to when the document's readyState suggests
// it is safe to do so.
if (EU.isIE) {
if (self !== self.top) {
document.onreadystatechange = function() {
if (document.readyState == 'complete') {
document.onreadystatechange = null;
EU._ready();
}
};
} else {
// Process onAvailable/onContentReady items when the
// DOM is ready.
YAHOO.util.Event.onDOMReady(
YAHOO.util.Event._tryPreloadAttach,
YAHOO.util.Event, true);
var n = document.createElement('p');
EU._dri = setInterval(function() {
try {
// throws an error if doc is not ready
n.doScroll('left');
clearInterval(EU._dri);
EU._dri = null;
EU._ready();
n = null;
} catch (ex) {
}
}, EU.POLL_INTERVAL);
}
// The document's readyState in Safari currently will
// change to loaded/complete before images are loaded.
} else if (EU.webkit && EU.webkit < 525) {
EU._dri = setInterval(function() {
var rs=document.readyState;
if ("loaded" == rs || "complete" == rs) {
clearInterval(EU._dri);
EU._dri = null;
EU._ready();
}
}, EU.POLL_INTERVAL);
// FireFox and Opera: These browsers provide a event for this
// moment. The latest WebKit releases now support this event.
} else {
EU._simpleAdd(document, "DOMContentLoaded", EU._ready);
}
/////////////////////////////////////////////////////////////
EU._simpleAdd(window, "load", EU._load);
EU._simpleAdd(window, "unload", EU._unload);
EU._tryPreloadAttach();
})();
}