W3C home > Mailing lists > Public > whatwg@whatwg.org > March 2007

[whatwg] Adding mouseenter and mouseleave events

From: Gareth Hay <gazhay@gmail.com>
Date: Thu, 15 Mar 2007 01:02:46 +0000
Message-ID: <A2469F7A-4809-4FD4-841D-A5C2A09754D5@gmail.com>
Can't you just return false from an event handler to prevent further  
bubbling?

On 15 Mar 2007, at 00:30, Magnus Kristiansen wrote:

> Mouseover/out events will trigger when elements contained inside  
> the EventTarget are hovered, and then bubble up. This is contrary  
> to the most obvious interpretation, as you are still inside (over)  
> the targeted element. IE supports two events, mouseenter[1] and  
> mouseleave[2], which solve this problem by not bubbling.
>
> It is possible to work around the problem by using target/ 
> relatedTarget and walking up the DOM tree. However, this requires  
> extra code for every event handler. Besides, these events were  
> often not meant to be generated in the first place, by the intent  
> of the author.
>
> I have no statistics for how often mouseover/out are used with and  
> without intent of bubbling, but the anecdotal evidence from my own  
> experience has never found me wanting it.
>
> I suggest these two events be added to the web applications spec.
>
> [1] http://msdn.microsoft.com/workshop/author/dhtml/reference/ 
> events/onmouseenter.asp
> [2] http://msdn.microsoft.com/workshop/author/dhtml/reference/ 
> events/onmouseleave.asp
>
> -- 
> Magnus Kristiansen
> "Don't worry; the Universe IS out to get you."
Received on Wednesday, 14 March 2007 18:02:46 UTC

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