W3C home > Mailing lists > Public > public-html@w3.org > December 2008

Re: Media element events

From: Ian Hickson <ian@hixie.ch>
Date: Tue, 2 Dec 2008 20:51:58 +0000 (UTC)
To: Simon Pieters <simonp@opera.com>, Eric Carlson <eric.carlson@apple.com>
Cc: public-html <public-html@w3.org>
Message-ID: <Pine.LNX.4.62.0812022049350.17401@hixie.dreamhostps.com>

On Tue, 2 Dec 2008, Simon Pieters wrote:
> The spec doesn't have any event handler attributes for them, but has for 
> seemingly all other events. Firefox seems to support at least <video 
> onloadstart>. Catching the 'loadstart' event is not possible without a 
> content event handler attribute if you have <video src> in the markup. 
> XHR has DOM event handler attributes for progress events. So it seems a 
> bit weird that <video> doesn't have them. Is it intentional?

The intent is that all events defined in HTML5 have corresponding event 
attributes (on all elements and Window), I just haven't gone through and 
actually defined them all yet.

> Another thing is that there are quite many events. The use cases for all 
> events aren't clear to us. Maybe some of them could be grouped together 
> into a single readystatechange event? Maybe also networkstatechange? 
> Maybe some could be dropped?

Why is having a lot of events a problem?

On Tue, 2 Dec 2008, Eric Carlson wrote:
> I agree that there are a lot of events, and actually we have also been 
> talking about coalescing all of the ready state and network state events 
> into readystatechange and networkstatechange. One potential problem with 
> this is that a script could miss state transitions because the 
> readyState or networkState attributes may have changed between the time 
> an event is posted and when the script's listener is triggered. I 
> haven't thought this through enough to know if it will be a serious 
> problem or not.

Experience with onreadystatechange with XMLHttpRequest also suggests that 
it is a bad authoring experience, as people just end up doing:

   o.onreadystatechange = function(e) {
     if (o.readyState == x) {

...for the case "x" that they want. Having individual events just seems 
saner given this idiom.

Ian Hickson               U+1047E                )\._.,--....,'``.    fL
http://ln.hixie.ch/       U+263A                /,   _.. \   _\  ;`._ ,.
Things that are impossible just take longer.   `._.-(,_..'--(,_..'`-.;.'
Received on Tuesday, 2 December 2008 20:52:35 UTC

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