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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <usenet@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Mon, 11 Feb 2013 01:38:52 +0100
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Subject: Re: Script in <a  > tag in IE
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Eric Bednarz wrote:

> Cezary Tomczyk <cezary.tomczyk@gmail.com> writes:
> 
> [event attributes versus DOM*]
> 
>> Arguments, with which I agree:
>>
>> http://stackoverflow.com/a/11742769/896702
> 
> […]
> | you are faced with having to reference named functions. This is not
> | always ideal (event handlers normally take anonymous functions)
> 
> The what? 'Normally', 'event handlers' are objects that implement the
> EventListener interface.

No, that would be event *listeners* which are implemented in user code. 
Event *handlers*, on the other hand, are implemented as built-in code that 
calls added event listeners (per W3C DOM Level 3 Events explicitly, in order 
of addition for an event).  (AISB)

Therefore, you would write

  el.addEventListener(eventType, eventListener, capturing);

to add an event listener for an event type to the represented element or

  el["on" + eventType.toLowerCase()] = eventListener;

to set the primary event listener for that event as non-capturing on the 
represented element.

Event listeners are called by the event handler for an event if they have 
not been removed later, and an event of a matching type is being propagated 
to the element.  As an (AFAIK undocumented) peculiarity of standards-
compliant DOM implementations, the object does not require the handleEvent() 
method of the EventListener interface to be implemented by the user; it 
suffices that the Function instance that is the event listener implements is 
callable, and it is called with the same arguments as handleEvent() would 
have been.  [However, IMHO a DOM event library should augment the Function 
instance with such a method, for maximum compatibility.  
jsx.dom.createEventListener() in JSX:events.js does that.]

The distinction is necessary because before W3C DOM Level 2 Events it was 
not possible to have more than one event listener for an event on an 
element.  (Which is why assigning to a then-proprietary event-handler 
property was often described misleadingly as assigning an “event handler” or 
an “event”, although the actual implementation did not differ much from the 
current ones.  The wrong terminology is [or was] prevalent in the MSDN 
Library.)

<https://developer.mozilla.org/en-US/docs/DOM/EventListener> p.

> The fantasy nomenclature for function
> declarations and expressions aside, function objects created by event
> handlers don't have an identifier, so they should be alright (eyeroll).

ACK :)

-- 
PointedEars

Twitter: @PointedEars2
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