/
event-debug.js
2076 lines (1840 loc) · 70.9 KB
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event-debug.js
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/*
Copyright (c) 2007, Yahoo! Inc. All rights reserved.
Code licensed under the BSD License:
http://developer.yahoo.net/yui/license.txt
version: 2.2.0
*/
/**
* The Event Utility provides utilities for managing DOM Events and tools
* for building event systems
*
* @module event
* @title Event Utility
* @namespace YAHOO.util
* @requires yahoo
*/
// The first instance of Event will win if it is loaded more than once.
// @TODO this needs to be changed so that only the state data that needs to
// be preserved is kept, while methods are overwritten/added as needed.
// This means that the module pattern can't be used.
if (!YAHOO.util.Event) {
/**
* The event utility provides functions to add and remove event listeners,
* event cleansing. It also tries to automatically remove listeners it
* registers during the unload event.
*
* @class Event
* @static
*/
YAHOO.util.Event = function() {
/**
* True after the onload event has fired
* @property loadComplete
* @type boolean
* @static
* @private
*/
var loadComplete = false;
/**
* Cache of wrapped listeners
* @property listeners
* @type array
* @static
* @private
*/
var listeners = [];
/**
* User-defined unload function that will be fired before all events
* are detached
* @property unloadListeners
* @type array
* @static
* @private
*/
var unloadListeners = [];
/**
* Cache of DOM0 event handlers to work around issues with DOM2 events
* in Safari
* @property legacyEvents
* @static
* @private
*/
var legacyEvents = [];
/**
* Listener stack for DOM0 events
* @property legacyHandlers
* @static
* @private
*/
var legacyHandlers = [];
/**
* The number of times to poll after window.onload. This number is
* increased if additional late-bound handlers are requested after
* the page load.
* @property retryCount
* @static
* @private
*/
var retryCount = 0;
/**
* onAvailable listeners
* @property onAvailStack
* @static
* @private
*/
var onAvailStack = [];
/**
* Lookup table for legacy events
* @property legacyMap
* @static
* @private
*/
var legacyMap = [];
/**
* Counter for auto id generation
* @property counter
* @static
* @private
*/
var counter = 0;
/**
* addListener/removeListener can throw errors in unexpected scenarios.
* These errors are suppressed, the method returns false, and this property
* is set
* @property lastError
* @type Error
*/
var lastError = null;
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 200@amp;50 ms, so it will poll
* for 10 seconds or until all outstanding handlers are bound
* (whichever comes first).
* @property POLL_RETRYS
* @type int
* @static
* @final
*/
POLL_RETRYS: 200,
/**
* The poll interval in milliseconds
* @property POLL_INTERVAL
* @type int
* @static
* @final
*/
POLL_INTERVAL: 20,
/**
* Element to bind, int constant
* @property EL
* @type int
* @static
* @final
*/
EL: 0,
/**
* Type of event, int constant
* @property TYPE
* @type int
* @static
* @final
*/
TYPE: 1,
/**
* Function to execute, int constant
* @property FN
* @type int
* @static
* @final
*/
FN: 2,
/**
* Function wrapped for scope correction and cleanup, int constant
* @property WFN
* @type int
* @static
* @final
*/
WFN: 3,
/**
* Object passed in by the user that will be returned as a
* parameter to the callback, int constant
* @property OBJ
* @type int
* @static
* @final
*/
OBJ: 3,
/**
* Adjusted scope, either the element we are registering the event
* on or the custom object passed in by the listener, int constant
* @property ADJ_SCOPE
* @type int
* @static
* @final
*/
ADJ_SCOPE: 4,
/**
* Safari detection is necessary to work around the preventDefault
* bug that makes it so you can't cancel a href click from the
* handler. Since this function has been used outside of this
* utility, it was changed to detect all KHTML browser to be more
* friendly towards the non-Safari browsers that share the engine.
* Internally, the preventDefault bug detection now uses the
* webkit property.
* @property isSafari
* @private
* @static
* @deprecated
*/
isSafari: (/KHTML/gi).test(navigator.userAgent),
/**
* If WebKit is detected, we keep track of the version number of
* the engine.
* Safari 1.3.2 (312.6): 312.8.1 <-- currently the latest
* available on Mac OSX 10.3.
* Safari 2.0.2: 416 <-- hasOwnProperty introduced
* Safari 2.0.4: 418 <-- preventDefault fixed (I believe)
* Safari 2.0.4 (419.3): 418.9.1 <-- current release
*
* http://developer.apple.com/internet/safari/uamatrix.html
* @property webkit
*/
webkit: function() {
var v=navigator.userAgent.match(/AppleWebKit\/([^ ]*)/);
if (v&&v[1]) {
return v[1];
}
return null;
}(),
/**
* IE detection needed to properly calculate pageX and pageY.
* capabilities checking didn't seem to work because another
* browser that does not provide the properties have the values
* calculated in a different manner than IE.
* @property isIE
* @private
* @static
*/
isIE: (!this.webkit && !navigator.userAgent.match(/opera/gi) &&
navigator.userAgent.match(/msie/gi)),
/**
* poll handle
* @property _interval
* @private
*/
_interval: null,
/**
* @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.timeout = setTimeout(callback, i);
}
},
/**
* 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.
*
* @method onAvailable
*
* @param {string} p_id the id of the element to look for.
* @param {function} p_fn what to execute when the element is found.
* @param {object} p_obj an optional object to be passed back as
* a parameter to p_fn.
* @param {boolean} p_override If set to true, p_fn will execute
* in the scope of p_obj
*
* @static
*/
onAvailable: function(p_id, p_fn, p_obj, p_override) {
onAvailStack.push( { id: p_id,
fn: p_fn,
obj: p_obj,
override: p_override,
checkReady: false } );
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.
*
* @method onContentReady
*
* @param {string} p_id the id of the element to look for.
* @param {function} p_fn what to execute when the element is ready.
* @param {object} p_obj an optional object to be passed back as
* a parameter to p_fn.
* @param {boolean} p_override If set to true, p_fn will execute
* in the scope of p_obj
*
* @static
*/
onContentReady: function(p_id, p_fn, p_obj, p_override) {
onAvailStack.push( { id: p_id,
fn: p_fn,
obj: p_obj,
override: p_override,
checkReady: true } );
retryCount = this.POLL_RETRYS;
this.startInterval();
},
/**
* Appends an event handler
*
* @method addListener
*
* @param {Object} el The html element to assign the
* event 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} override If true, the obj passed in becomes
* the execution scope of the listener
* @return {boolean} True if the action was successful or defered,
* false if one or more of the elements
* could not have the listener attached,
* or if the operation throws an exception.
* @static
*/
addListener: function(el, sType, fn, obj, override) {
if (!fn || !fn.call) {
// this.logger.debug("Error, function is not valid " + fn);
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,
override) && ok;
}
return ok;
} else if (typeof el == "string") {
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.on(el, sType, fn, obj, override);
});
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, override];
return true;
}
// this.logger.debug("Adding handler: " + el + ", " + sType);
// if the user chooses to override the scope, we use the custom
// object passed in, otherwise the executing scope will be the
// HTML element that the event is registered on
var scope = el;
if (override) {
if (override === true) {
scope = obj;
} else {
scope = override;
}
}
// wrap the function so we can return the obj object when
// the event fires;
var wrappedFn = function(e) {
return fn.call(scope, YAHOO.util.Event.getEvent(e),
obj);
};
var li = [el, sType, fn, wrappedFn, scope];
var index = listeners.length;
// cache the listener so we can try to automatically unload
listeners[index] = li;
if (this.useLegacyEvent(el, sType)) {
var legacyIndex = this.getLegacyIndex(el, sType);
// Add a new dom0 wrapper if one is not detected for this
// element
if ( legacyIndex == -1 ||
el != legacyEvents[legacyIndex][0] ) {
legacyIndex = legacyEvents.length;
legacyMap[el.id + sType] = legacyIndex;
// cache the signature for the DOM0 event, and
// include the existing handler for the event, if any
legacyEvents[legacyIndex] =
[el, sType, el["on" + sType]];
legacyHandlers[legacyIndex] = [];
el["on" + sType] =
function(e) {
YAHOO.util.Event.fireLegacyEvent(
YAHOO.util.Event.getEvent(e), legacyIndex);
};
}
// add a reference to the wrapped listener to our custom
// stack of events
//legacyHandlers[legacyIndex].push(index);
legacyHandlers[legacyIndex].push(li);
} else {
try {
this._simpleAdd(el, sType, wrappedFn, false);
} 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;
},
/**
* When using legacy events, the handler is routed to this object
* so we can fire our custom listener stack.
* @method fireLegacyEvent
* @static
* @private
*/
fireLegacyEvent: function(e, legacyIndex) {
// this.logger.debug("fireLegacyEvent " + legacyIndex);
var ok=true,le,lh,li,scope,ret;
lh = legacyHandlers[legacyIndex];
for (var i=0,len=lh.length; i<len; ++i) {
li = lh[i];
if ( li && li[this.WFN] ) {
scope = li[this.ADJ_SCOPE];
ret = li[this.WFN].call(scope, e);
ok = (ok && ret);
}
}
// Fire the original handler if we replaced one. We fire this
// after the other events to keep stopPropagation/preventDefault
// that happened in the DOM0 handler from touching our DOM2
// substitute
le = legacyEvents[legacyIndex];
if (le && le[2]) {
le[2](e);
}
return ok;
},
/**
* Returns the legacy event index that matches the supplied
* signature
* @method getLegacyIndex
* @static
* @private
*/
getLegacyIndex: function(el, sType) {
var key = this.generateId(el) + sType;
if (typeof legacyMap[key] == "undefined") {
return -1;
} else {
return legacyMap[key];
}
},
/**
* Logic that determines when we should automatically use legacy
* events instead of DOM2 events. Currently this is limited to old
* Safari browsers with a broken preventDefault
* @method useLegacyEvent
* @static
* @private
*/
useLegacyEvent: function(el, sType) {
if (this.webkit && ("click"==sType || "dblclick"==sType)) {
var v = parseInt(this.webkit, 10);
if (!isNaN(v) && v<418) {
return true;
}
}
return false;
},
/**
* Removes an event handler
*
* @method removeListener
*
* @param {Object} el the html element or the id of the element to
* assign the event to.
* @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;
// 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=0,len=el.length; i<len; ++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=0, len=unloadListeners.length; i<len; i++) {
var li = unloadListeners[i];
if (li &&
li[0] == el &&
li[1] == sType &&
li[2] == fn) {
unloadListeners.splice(i, 1);
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(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);
if (this.useLegacyEvent(el, sType)) {
var legacyIndex = this.getLegacyIndex(el, sType);
var llist = legacyHandlers[legacyIndex];
if (llist) {
for (i=0, len=llist.length; i<len; ++i) {
li = llist[i];
if (li &&
li[this.EL] == el &&
li[this.TYPE] == sType &&
li[this.FN] == fn) {
llist.splice(i, 1);
break;
}
}
}
} else {
try {
this._simpleRemove(el, sType, cacheItem[this.WFN], false);
} 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);
return true;
},
/**
* Returns the event's target element
* @method getTarget
* @param {Event} ev the event
* @param {boolean} resolveTextNode when set to true the target's
* parent will be returned if the target is a
* text node. @deprecated, the text node is
* now resolved automatically
* @return {HTMLElement} the event's target
* @static
*/
getTarget: function(ev, resolveTextNode) {
var t = ev.target || ev.srcElement;
return this.resolveTextNode(t);
},
/**
* In some cases, some browsers will return a text node inside
* the actual element that was targeted. This normalizes the
* return value for getTarget and getRelatedTarget.
* @method resolveTextNode
* @param {HTMLElement} node node to resolve
* @return {HTMLElement} the normized node
* @static
*/
resolveTextNode: function(node) {
// if (node && node.nodeName &&
// "#TEXT" == node.nodeName.toUpperCase()) {
if (node && 3 == node.nodeType) {
return node.parentNode;
} else {
return node;
}
},
/**
* 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
* @return {Event} the event
* @static
*/
getEvent: function(e) {
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) {
return ev.charCode || ev.keyCode || 0;
},
/**
* Locating the saved event handler data by function ref
*
* @method _getCacheIndex
* @static
* @private
*/
_getCacheIndex: function(el, sType, fn) {
for (var i=0,len=listeners.length; i<len; ++i) {
var li = listeners[i];
if ( li &&
li[this.FN] == fn &&
li[this.EL] == el &&
li[this.TYPE] == sType ) {
return i;
}
}
return -1;
},
/**
* Generates an unique ID for the element if it does not already
* have one.
* @method generateId
* @param el the element to create the id for
* @return {string} the resulting id of the element
* @static
*/
generateId: function(el) {
var id = el.id;
if (!id) {
id = "yuievtautoid-" + counter;
++counter;
el.id = id;
}
return id;
},
/**
* We want to be able to use getElementsByTagName as a collection
* to attach a group of events to. Unfortunately, different
* browsers return different types of collections. This function
* tests to determine if the object is array-like. It will also
* fail if the object is an array, but is empty.
* @method _isValidCollection
* @param o the object to test
* @return {boolean} true if the object is array-like and populated
* @static
* @private
*/
_isValidCollection: function(o) {
return ( o && // o is something
o.length && // o is indexed
typeof o != "string" && // o is not a string
!o.tagName && // o is not an HTML element
!o.alert && // o is not a window
typeof o[0] != "undefined" );
},
/**
* @private
* @property elCache
* DOM element cache
* @static
*/
elCache: {},
/**
* We cache elements bound by id because when the unload event
* fires, we can no longer use document.getElementById
* @method getEl
* @static
* @private
*/
getEl: function(id) {
return document.getElementById(id);
},
/**
* Clears the element cache
* @deprecated Elements are not cached any longer
* @method clearCache
* @static
* @private
*/
clearCache: function() { },
/**
* hook up any deferred listeners
* @method _load
* @static
* @private
*/
_load: function(e) {
loadComplete = true;
var EU = YAHOO.util.Event;
// Remove the listener to assist with the IE memory issue, but not
// for other browsers because FF 1.0x does not like it.
if (this.isIE) {
EU._simpleRemove(window, "load", EU._load);
}
},
/**
* 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 (this.locked) {
return false;
}
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);
}
// onAvailable
var notAvail = [];
for (var i=0,len=onAvailStack.length; i<len ; ++i) {
var item = onAvailStack[i];
if (item) {
var el = this.getEl(item.id);
if (el) {
// The element is available, but not necessarily ready