📄 event.js
字号:
}
}
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) {
return false;
}
if (this.useLegacyEvent(el, sType)) {
var legacyIndex = this.getLegacyIndex(el, sType);
var llist = legacyHandlers[legacyIndex];
if (llist) {
for (i=0, len=llist.length; i<len; ++i) {
li = llist[i];
if (li &&
li[this.EL] == el &&
li[this.TYPE] == sType &&
li[this.FN] == fn) {
llist.splice(i, 1);
break;
}
}
}
} else {
this._simpleRemove(el, sType, cacheItem[this.WFN], 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
* @type int[]
* @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(e) {
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) {
// this.logger.debug(o.constructor.toString())
// this.logger.debug(typeof 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;
// 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
if ( !item.checkReady ||
loadComplete ||
el.nextSibling ||
(document && document.body) ) {
var scope = el;
if (item.override) {
if (item.override === true) {
scope = item.obj;
} else {
scope = item.override;
}
}
item.fn.call(scope, item.obj);
delete onAvailStack[i];
}
} else {
notAvail.push(item);
}
}
}
retryCount = (notAvail.length === 0) ? 0 : retryCount - 1;
if (tryAgain) {
this.startInterval();
} else {
clearInterval(this._interval);
this._interval = null;
}
this.locked = false;
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -