jQuery中有很好用的trigger来触发事件,但总不能写什么都去引入jQuery吧
一个简单的需求,实现类似IE下的fireEvent效果<要兼容其它主流浏览器>
关于这二个方法,没记得起来,然后就google了一把:
IE下:
语法:
oNewEvent = object.createEventObject( [oExistingEvent])
创建的事件对象,也可以取消冒泡、阻止默认事件。(cancelBubble、returnValue)
例子:
<html>
<body>
<script>
function OuterClick() {
if(event.expando == "from_inner")
{
alert("Event actually fired by clicking on inner DIV!")
}
else
{
alert("Event fired by clicking on outer DIV!")
}
}
function InnerClick() {
var eventObj = document.createEventObject();
// Set an expando property on the event object. This will be used by the
// event handler to determine what element was clicked on.
eventObj.expando = "from_inner";
parent.document.all.Outer.fireEvent("onclick",eventObj);
event.cancelBubble = true;
}
</script>
<div id="Outer" onclick="OuterClick()" style="height:200;width:200;padding:50;background-color:mistyrose">
<div id="Inner" onclick="InnerClick()" style="height:100;width:100;padding:25;background-color:lavender"></div>
</div>
</body>
</html>
msdn地址:http://msdn.microsoft.com/en-us/library/ms536390(VS.85).aspx
FF遵循并实现了W3C对DOM 2、DOM 3的事件定义:
语法:
var event = document.createEvent(type);
例子:
function simulateClick() {
var evt = document.createEvent("MouseEvents");
evt.initMouseEvent("click", true, true, window,
0, 0, 0, 0, 0, false, false, false, false, 0, null);
var cb = document.getElementById("checkbox");
var canceled = !cb.dispatchEvent(evt);
if(canceled) {
// A handler called preventDefault
alert("canceled");
} else {
// None of the handlers called preventDefault
alert("not canceled");
}
}
选创建事件对象,然后派发此事件对象,派发的返回值可以检测事件处理句柄是否阻止也默认事件(返回false则被阻止)
访问MDC关于createEvent的说明:https://developer.mozilla.org/en/DOM/document.createEvent
回到最初的起点,如果只是想实现类似fireEvent的方法:
var elem = xxx;
if (document.createEventObject && elem.fireEvent) {
elem.fireEvent('onclick');
} else if (document.createEvent){
var evt = document.createEvent('MouseEvents');
evt.initMouseEvent("click", true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
elem.dispatchEvent(evt);
}