WebSockets are one of the big, new things that comes with the HTML5 generation.
Up till now, the client web browser interacted with the server mostly with the
simple request-response; i.e. click and you get something back. Sure, you could
have some dynamics in the web-page itself, but to get an update from the
server, you'd have to click again. There have been various work-arounds
allowing a server to pass something to the browser without being asked, but
they've been difficult and clutsy (I've tried them all and invented some.)
WebSockets remain alive for bi-directional (even simultaneous) communication
between browser and server. And they're as easy to use from the browser side as
Ajax, perhaps easier.
The example most often used to introduce bi-directional communication (at least
the server-sent events part) is the stock ticker. As the server gets constantly
updated price information from stock exchanges, it can immediately send the
information to browsers. Stock traders don't need to click for update
constantly throughout the day.
I've been using server-sent events for robotics software, driving SVG animated
graphics that show where the robot is. Here are links to three related articles
in my blog. Don't worry about the jittering in the first one. That's not the
webserver implementation.
http://highlevellogic.blogspot.com/2010/10/lego-mindstorms-nxt-robots-lejos.html
http://highlevellogic.blogspot.com/2010/09/multi-use-browser-based-gui.html
http://highlevellogic.blogspot.com/2010/09/hll-robotics-demo-video.html
--- Den mån 2011-08-29 skrev cremnosedum <rich...@pixelpalaces.com>:
Från: cremnosedum <rich...@pixelpalaces.com>
Ämne: [svg-developers] Re: Free WebSocket server / HTML5 (all for you)
Till: svg-developers@yahoogroups.com
Datum: måndag 29 augusti 2011 17:46
Hi,
Perhaps you can give some examples of what this will be able to do or links to
something that explains why one might want to use a websocket server. If it
sounds like something that I think customers would be interested in, then I
would probably be interested in using it.
Richard Pearman http://www.pixelpalaces.com/
The next stage in the evolution of web comics:
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Read my Helium articles: http://www.helium.com/users/212199
South Alberta Cactus and succulent society:
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--- In svg-developers@yahoogroups.com, "Roger F. Gay" <rogerfgay@...> wrote:
>
> Interest survey - seriously, I'm takin' names. If this interests you, please
> respond. I'll help make sure it works well for you.
> I want to know the level of interest among people in this group - even if you
> might like to get in early and influence development. Are you:
> Just curiousSerious about HTML5 but don't know what websockets areSerious
> about HTML5 and find websockets interesting but don't have a project in
> mindThis all sounds interesting but will have to think about itWOW! Now
> you're talking. Sign me up!Other
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