javascript处理事件绑定的一些兼容写法_javascript技巧



绑定事件
代码如下:
var addEvent = function( obj, type, fn ) {
if (obj.addEventListener)
obj.addEventListener( type, fn, false );
else if (obj.attachEvent) {
obj["e"+type+fn] = fn;
obj.attachEvent( "on"+type, function() {
obj["e"+type+fn]();
} );
}
};

另一个实现
代码如下:
var addEvent = (function () {
if (document.addEventListener) {
return function (el, type, fn) {
el.addEventListener(type, fn, false);
};
} else {
return function (el, type, fn) {
el.attachEvent('on' + type, function () {
return fn.call(el, window.event);
});
}
}
})();

绑定onpropertychange事件

onpropertychange是微软制造的一个事件，它在一个元素的属性发生变化的时候触发，常见的有文本的长度改变，样长改变等，FF大致和它相似的属性为oninput事件，不过它只针对textfield与textarea的value属性。safari，firefox，chrome与 opera都支持此属性。
代码如下:
var addPropertyChangeEvent = function (obj,fn) {
if(window.ActiveXObject){
obj.onpropertychange = fn;
}else{
obj.addEventListener("input",fn,false);
}
}

移除事件
代码如下:
var removeEvent = function( obj, type, fn ) {
if (obj.removeEventListener)
obj.removeEventListener( type, fn, false );
else if (obj.detachEvent) {
obj.detachEvent( "on"+type, obj["e"+type+fn] );
obj["e"+type+fn] = null;
}
};

加载事件
代码如下:
var loadEvent = function(fn) {
var oldonload = window.onload;
if (typeof window.onload != 'function') {
window.onload = fn;
}else {
window.onload = function() {
oldonload();
fn();
}
}
}

阻止事件
代码如下:
var stopEvent = function(e){
e = e || window.event;
if(e.preventDefault) {
e.preventDefault();
e.stopPropagation();
}else{
e.returnValue = false;
e.cancelBubble = true;
}
}

如果仅仅是阻止事件冒泡
代码如下:
var stopPropagation = function(e) {
e = e || window.event;
if (!+"\v1") {
e.cancelBubble = true;
} else {
e.stopPropagation();
}
}

取得事件源对象

相当于Prototype.js框架的Event.element(e)
代码如下:
var getEvent = function(e){
e = e || window.event;
var target = event.srcElement ? event.srcElement : event.target;
return target
}

或者这个功能更强大，我在开发datagrid时开发出来的，详细用法见《一步步教你实现表格排序（第二部分）》。
代码如下:
var getEvent = function(e) {
var e = e || window.event;
if (!e) {
var c = this.getEvent.caller;
while (c) {
e = c.arguments[0];
if (e && (Event == e.constructor || MouseEvent == e.constructor)) {
break;
}
c = c.caller;
}
}
var target = e.srcElement ? e.srcElement : e.target,
currentN = target.nodeName.toLowerCase(),
parentN = target.parentNode.nodeName.toLowerCase(),
grandN = target.parentNode.parentNode.nodeName.toLowerCase();
return [e,target,currentN,parentN,grandN];
}

最后附上DOM3.0事件的一览表

type	Bubbling phase	Cancelable	Target node types	DOM interface
DOMActivate	Yes	Yes	Element	UIEvent
DOMFocusIn	Yes	No	Element	UIEvent
DOMFocusOut	Yes	No	Element	UIEvent
focus	No	No	Element	UIEvent
blur	No	No	Element	UIEvent
textInput	Yes	Yes	Element	TextEvent
click	Yes	Yes	Element	MouseEvent
dblclick	Yes	Yes	Element	MouseEvent
mousedown	Yes	Yes	Element	MouseEvent
mouseup	Yes	Yes	Element	MouseEvent
mouseover	Yes	Yes	Element	MouseEvent
mousemove	Yes	Yes	Element	MouseEvent
mouseout	Yes	Yes	Element	MouseEvent
keydown	Yes	Yes	Element	KeyboardEvent
keyup	Yes	Yes	Element	KeyboardEvent
mousemultiwheel	Yes	Yes	Document, Element	MouseMultiWheelEvent
mousewheel	Yes	Yes	Document, Element	MouseWheelEvent
DOMSubtreeModified	Yes	No	Document, DocumentFragment, Element, Attr	MutationEvent
DOMNodeInserted	Yes	No	Element, Attr, Text, Comment, CDATASection, DocumentType, EntityReference, ProcessingInstruction	MutationEvent
DOMNodeRemoved	Yes	No	Element, Attr, Text, Comment, CDATASection, DocumentType, EntityReference, ProcessingInstruction	MutationEvent
DOMNodeRemovedFromDocument	No	No	Element, Attr, Text, Comment, CDATASection, DocumentType, EntityReference, ProcessingInstruction	MutationEvent
DOMNodeInsertedIntoDocument	No	No	Element, Attr, Text, Comment, CDATASection, DocumentType, EntityReference, ProcessingInstruction	MutationEvent
DOMAttrModified	Yes	No	Element	MutationEvent
DOMCharacterDataModified	Yes	No	Text, Comment, CDATASection, ProcessingInstruction	MutationEvent
DOMElementNameChanged	Yes	No	Element	MutationNameEvent
DOMAttributeNameChanged	Yes	No	Element	MutationNameEvent
load	No	No	Document, Element	Event
unload	No	No	Document, Element	Event
abort	Yes	No	Element	Event
error	Yes	No	Element	Event
select	Yes	No	Element	Event
change	Yes	No	Element	Event
submit	Yes	Yes	Element	Event
reset	Yes	Yes	Element	Event
resize	Yes	No	Document, Element	UIEvent
scroll	Yes	No	Document, Element	UIEvent

作者:Ruby's Louvre