As it turns out, most new web applications over the next couple years will need to push data from the server to the browser whenever that data becomes ready.
> Uwe wrote: > You can't really actively "send" information from the server to the client, > unless there is some kind of connection established. Normal http connects, > reads or writes and disconnects, but a browser doesn't maintain any kind of > connection to the server. Indeed, this didn't used to be the case, but if you take a look at the html5 standard for the event-source dom element ( http://www.whatwg.org/specs/web-apps/current-work/multipage/section-server-sent-events.html#server-sent-events), you'll see that this has changed. Granted, event-source only currently works in opera9. But there are many other methods that can be used. Paul Wrote: Orbited > (http://brbx.com/orbited/) is a library that I've successfully used to > do Comet with TurboGears. I'm one of the core developers of orbited, and it sounds like this is exactly what you want. Take a look at this tutorial: http://orbited.org/tutorials/cherrychat.html and you'll get a better idea of what the library is capable of. Assuming you don't want to use an external library, what you want is to use the javascript function setInterval to have each browser make an XHR request for the the presence data every X seconds (10 would be reasonable in your case.) Your turbogears app can keep track of the last set of data it sent each client in that browser's session object on the tg server, and then respond with json in a format somewhat like: [ 'unchanged', {} ] or [ 'changed', { 'user1': 'away', 'user2': 'here' } ]. Then you just check the first array element of the returned data to see if you need to update the DOM or not. Just keep in mind, that this will only work for a couple dozens users at best before your server becomes somewhat unresponsive. In order to achieve high concurrency you need to use a project like Orbited. -Michael Carter --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "TurboGears" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/turbogears?hl=en -~----------~----~----~----~------~----~------~--~---
