createEventObject 与 createEvent EDIT WATCH

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:

createEventObject Method

 

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);
}
posted @ 2010-12-02 17:20  meteoric_cry  阅读(1869)  评论(0编辑  收藏  举报