How send notify to client?

[Guest]

Hello
I'm doing web site to play chess online, when a player play, I need to send a notify to another client for it can refresh, in windows applications I can do that throw observer pattern, but in web, how I can doit?

 

[Natty Gur]

Hi,

In web scenario just clients can initiate request to server but servers
can't initiate calls to clients just response to client requests. There
are several ways to achieve what you after:
1) Use client side code (Java Applets, COM object, Assembly – if your
client got CLR) to create publish subscribe design pattern.
2) Use XMLHttpRequest with javascript and timer to check the server for
state change.
3) Use Iframe with <META HTTP-EQUIV="Refresh" CONTENT="3 "> to auto
refresh Iframe. While Iframe process on the server side you can check
state and return indication to client side.

HTH
Natty Gur[MVP]

blog : http://weblogs.asp.net/ngur
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