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Re: ECMAScript binding for EventListener

From: Johnny Stenback <jst@netscape.com>
Date: Thu, 14 Jun 2001 17:52:38 -0700
Message-ID: <3B295C56.4040506@netscape.com>
To: David Flanagan <david@oreilly.com>
CC: www-dom@w3.org


David Flanagan wrote:

> In the Level 2 DOM, the ECMAScript binding for the EventListener
> interface is simply a function reference.
> 
> While this is very convenient for JavaScript programmers, it sacrifices
> the power that comes with treating EventListener as a true object.
> Specifically, the current binding allows us to register only functions
> as event handlers, and does not allow us to register object methods as
> handlers.  (Mozilla currently invokes any event handler function you
> register as a method of the event target.)
> 
> I'd like to propose that the next edition of the specification broaden
> the ECMAScript binding so that EventListener may be either a function or
> an object.  If an object o is registered, it must have a property named
> handleEvent that contains a function reference.  When the appropriate
> event occurs, this function is invoked _as a method of the object o_.
> 
> As a trivial example, I ought to be able to write code like this:
> 
> 	element.addEventListener("click",
> 		   { 
> 		      message: "Hello world",
> 		      handleEvent: function(e) { alert(this.message); }
>                    },
> 		   false);
> 
> Anyone have thoughts about this?
> 


For the record, this already works in recent versions of mozilla (and 
Netscape 6.1 beta).


>      David Flanagan
> 
> 


-- 
jst
Received on Thursday, 14 June 2001 20:49:18 GMT

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