Posted by Jerry Stuckle on 08/23/07 13:06

Piotr Nowak wrote:
> Hi,
>
> Say i have a server process which listens for some changes in database.
> When a change occurs i want to refresh my page in browser by notyfinig it.
>
> I do not want to refresh my page i.e. every 5 seconds, i just want to
> refresh it ONLY on server change just like desktop applications do.
>
> The problem is that refreshing evry n seconds has to much impact on my
> web server. The refresh action should be taken only when something
> really happens that makes sense
>
> Is it possible ?
>
> greets, peter

Despite some other comments, no, it's not really possible with HTTP
protocol. HTTP is a "request/response" protocol - the browser sends a
request and the server responds. There really isn't a mechanism for
sending unsolicited responses.

As others have mentioned, it is possible to to with other means, i.e.
Java or Flash. But not in PHP.

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Jerry Stuckle
JDS Computer Training Corp.
jstucklex@attglobal.net
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