On 17 January 2011 21:50, Jeremy Shaw
On Jan 17, 2011, at 2:19 PM, Corentin Dupont wrote:
Indeed, I tried with <META HTTP-EQUIV="Refresh" CONTENT="n"> ? and it's unusable. It make blink the page, ungrey the "stop" button for a second and make the fields loose the focus so it's impossible to type in.
I'll try with XMLHTTPRequest.
Right. Using the jQuery library should make it easier to do ajax requests and modify the DOM on the fly, http://jquery.com/ - jeremy _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
A nice variation of polling is "long polling": http://en.wikipedia.org/wiki/Push_technology#Long_polling This can easily be accomplished in Haskell by having an MVar per session. Initially an empty MVar is created per new session. When a client makes a request, the server thread that handles the request takes the MVar belonging to the session. This thread will block until the MVar is filled. When the server has an update it will fill all the MVars. This causes all the blocked threads to continue with sending a response to the client notifying it about the update. Like Jeremy said it's a good idea to make these update requests asynchronous. Regards, Bas