Element.Event
addEvent(type,fn)：为DOM元素增加一个事件监听器
removeEvent(type,fn):移除先前为DOM元素添加的事件监听器
eg:
var destroy = function(){ alert('Boom: ' + this.id); } // this refers to the Element.
$('myElement').addEvent('click', destroy);
//later...
$('myElement').removeEvent('click', destroy);
addEvents(events):一次为一个DOM元素添加多个事件监听器
eg:
$('myElement').addEvents({
mouseover: function(){
alert('mouseover');
},
click: function(){
alert('click');
}
});
removeEvents(events):移除DOM元素上某个类型的事件的所有监听器
var myElement = $('myElement');
myElement.addEvents({
mouseover: function(){
alert('mouseover');
},
click: function(){
alert('click');
}
});
myElement.addEvent('click', function(){ alert('clicked again'); });
myElement.addEvent('click', function(){ alert('clicked and again :('); });
//addEvent will keep appending each function.
//Unfortunately for the visitor, there will be three alerts they'll have to click on.
myElement.removeEvents('click'); // saves the visitor's finger by removing every click event.
fireEvent(type[,param,delay]):执行一个DOM元素上某个类型的事件的所有监听器，多用于需要在特定的时间或者场合下触发事件时
eg1:
function test(a) {
console.log(a);
}
$("btn1").addEvent('click', test);
$("btn1").addEvent('click', function() {
console.log('btn1 click event run')
});
$("btn1").fireEvent("click", "hello,world");
这个例子中代码将在页面一加载完就执行，而不需要等到click btn1时才执行。下面这个例子将更好的说明fireEvent的使用场合：
textarea.addEvents({
focus: function() {
// When focusing, if the textarea contains value "Type here", we
// simply clear it.
if (textarea.value.contains('Type here')) textarea.set('value', '');
},
keyup: function() {
// When user keyups we check if there are any of the magic words.
// If yes, we fire our custom event burn with a different text for each one.
if (textarea.value.contains('hello')) textarea.fireEvent('burn', 'hello world!');
else if (textarea.value.contains('moo')) textarea.fireEvent('burn', 'mootools!');
else if (textarea.value.contains('pizza')) textarea.fireEvent('burn', 'Italy!');
else if (textarea.value.contains('burn')) textarea.fireEvent('burn', 'fireEvent');
// note that in case of 'delayed', we are firing the event 1 second late.
else if (textarea.value.contains('delayed')) textarea.fireEvent('burn', "I'm a bit late!", 1000);
},
burn: function(text) {
// When the textarea contains one of the magic words
// we reset textarea value and set the log with text
textarea.set('value', '');
log.set('html', text);
// then we start the highlight morphing
highlight.start({
backgroundColor: ['#fff36f', '#fff'],
opacity: [1, 0]
});
}
});
注意标红部分。
结合这两个例子，想必fireEvent的用法已经很清楚了。
cloneEvent（from[,type]）：从一个DOM元素上复制所有监听器到本元素：
eg：
function test(a) {
console.log(a);
}
$("btn1").addEvent('click', test);
$("btn1").addEvent('click', function() {
console.log('btn1 click event run')
});
$("btn1").fireEvent("click", 123);
$("btn2").cloneEvents($("btn1"));
将btn1上绑定的事件复制给btn2