关于IE下attachEvent不能绑定this的问题-优快云博客

本文提供了一种跨浏览器的事件处理方法，解决了传统方法中仅能为特定对象的事件绑定单一处理函数的问题。通过创建自定义函数堆栈，该方案允许为同一事件类型绑定多个处理函数，并确保它们按绑定顺序执行。

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由于帖子"关于IE和Firefox下event乱谈"的回复中有好人提到IE下attachEvent不能绑定this的问题,并给出了一些解决方案,这里收集一段代码:
代码来源:http://therealcrisp.xs4all.nl/upload/addEvent.html#

js 代码

/**
* Crossbrowser event handling functions.
*
* A set of functions to easily attach and detach event handlers to HTML elements.
* These functions work around the shortcomings of the traditional method
* ( element.onevent = function; )
* where only 1 handler could be attached for a certain event on the object, and
* mimic the DOM level 2
* event methods addEventListener and removeEventListener for browsers that do not
* support these
* methods (e.g. Internet Explorer) without resorting to propriety methods such as
* attachEvent and detachEvent
* that have a whole set of their own shortcomings.
* Created as an entry for the 'contest' at quirksmode.org:
* http://www.quirksmode.org/blog/archives/2005/09/addevent_recodi.html
*
* @author Tino Zijdel ( crisp@xs4all.nl )
* @version 1.0
* @date 2005-09-09
*/
/**
* addEvent
*
* Generic function to attach event listeners to HTML elements.
* This function does NOT use attachEvent but creates an own stack of function
* references
* in the DOM space of the element. This prevents closures and therefor possible
* memory leaks.
* Also because of the way the function references are stored they will get executed
* in the
* same order as they where attached - matching the behavior of addEventListener.
*
* @param obj The object to which the event should be attached.
* @param evType The eventtype, eg. 'click', 'mousemove' etcetera.
* @param fn The function to be executed when the event fires.
* @param useCapture (optional) Whether to use event capturing, or event bubbling
* (default).
*/
function addEvent(obj, evType, fn, useCapture)
{
//-- Default to event bubbling
if (!useCapture) useCapture = false;
//-- DOM level 2 method
if (obj.addEventListener)
{
obj.addEventListener(evType, fn, useCapture);
}
else
{
//-- event capturing not supported
if (useCapture)
{
alert('This browser does not support event capturing!');
}
else
{
var evTypeRef = '__' + evType;
//-- create function stack in the DOM space of the element; seperate stacks for each
event type
if (!obj[evTypeRef])
{
//-- create the stack if it doesn't exist yet
obj[evTypeRef] = [];
//-- if there is an inline event defined store it in the stack
var orgEvent = obj['on'+evType];
if (orgEvent) obj[evTypeRef][0] = orgEvent;
//-- attach helper function using the DOM level 0 method
obj['on'+evType] = IEEventHandler;
}
else
{
//-- check if handler is not already attached, don't attach the same function twice to match
behavior of addEventListener
for (var ref in obj[evTypeRef])
{
if (obj[evTypeRef][ref] === fn) return;
}
}
//-- add reference to the function to the stack
obj[evTypeRef][obj[evTypeRef].length] = fn;
}
}
}
/**
* removeEvent
*
* Generic function to remove previously attached event listeners.
*
* @param obj The object to which the event listener was attached.
* @param evType The eventtype, eg. 'click', 'mousemove' etcetera.
* @param fn The listener function.
* @param useCapture (optional) Whether event capturing, or event bubbling
* (default) was used.
*/
function removeEvent(obj, evType, fn, useCapture)
{
//-- Default to event bubbling
if (!useCapture) useCapture = false;
//-- DOM level 2 method
if (obj.removeEventListener)
{
obj.removeEventListener(evType, fn, useCapture);
}
else
{
var evTypeRef = '__' + evType;
//-- Check if there is a stack of function references for this event type on the object
if (obj[evTypeRef])
{
//-- iterate through the stack
for (var ref in obj[evTypeRef])
{
//-- if function reference is found, remove it
if (obj[evTypeRef][ref] === fn)
{
try
{
delete obj[evTypeRef][ref];
}
catch(e)
{
obj[evTypeRef][ref] = null;
}
return;
}
}
}
}
}
/**
* IEEventHandler
*
* IE helper function to execute the attached handlers for events.
* Because of the way this helperfunction is attached to the object (using the DOM
* level 0 method)
* the 'this' keyword will correctely point to the element that the handler was
* defined on.
*
* @param e (optional) Event object, defaults to window.event object when not passed
* as argument (IE).
*/
function IEEventHandler(e)
{
e = e || window.event;
var evTypeRef = '__' + e.type;
//-- check if there is a custom function stack defined for this event type on the object
if (this[evTypeRef])
{
//-- iterate through the stack and execute each function in the scope of the object by using
function.call
for (var ref in this[evTypeRef])
{
if (Function.call)
{
this[evTypeRef][ref].call(this, e);
}
else
{
//-- IE 5.0 doesn't support call or apply, so use this
this.__fn = this[evTypeRef][ref];
this.__fn(e);
this.__fn = null;
}
}
}
}