W3C home > Mailing lists > Public > public-webapi@w3.org > January 2007

Re: Progress event spec

From: Jean-Claude Dufourd <jean-claude.dufourd@streamezzo.com>
Date: Tue, 30 Jan 2007 12:00:40 +0100
Message-ID: <45BF2558.5050400@streamezzo.com>
To: Charles McCathieNevile <chaals@opera.com>
CC: Web API public <public-webapi@w3.org>
Charles McCathieNevile wrote:
> progress events are fired because you already have some other operation in 
> progress, which will start and finish. For something like an HTTP connection 
> where you take a couple of seconds to establish the connection it would be 
> useful to fire a progress event with zero bytes loaded.
>
> In the case of doing this for a connection where you don't know the length, this 
> will be indistinguishable from a (now presumably completed) zero-length transfer. 
> But since the transfer has presumably finished, what kind of UA would actually 
> fire such a pointless event? It already *must* fire the load event, which you 
> can trap to note that your loading is finished.
>   
JCD: I have already answered about the "load" event, which I believe is 
disconnected (connected to the loading of the element, not to the 
loading of the resource when the xlink:href is updated by scripting or 
animation).
> So the assumption behind the above combination is that it is a justifiable hack. 
> I certainly haven't seen any use case for the zero-length transfer to fire a 
> progress event - if there is one, then of course this hack is not good enough.
>   
JCD: I want to be able to start an animation on "beginning of load", and 
stop it on "end of load", and just use the simple syntax of an event in 
a begin/end attribute. This is easy, well-known and liked by authors, 
why do you want to remove that syntax facility ?
>   
>> The SVG working group is working on Media Access Events. Did you think
>> of reading that spec and checking if there are interactions ? Would it
>> be meaningful to merge the two ?
>>     
>
> I might have a more interesting opinion after having *actually* read it instead 
> of just thinking about it :)
>   
JCD: Was that too English ? If so I apologize. Did you read the MAE spec 
and did you find interactions and should we merge the two specs ?
Thanks
JC
-- 

*Jean-Claude Dufourd* - Chief Scientist, *Streamezzo*
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Received on Tuesday, 30 January 2007 11:02:27 GMT

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