A question about RAISE NOTICE

Hello everyone,

I have a question concerning RAISE NOTICE.... I have a plpgsql function where it has a code like this:

IF (condition) THEN
    RAISE NOTICE 'This condition is verified';
END IF;

and this function is fired when I modify a view's field which as a RULE INSTEAD DO where it calls this function. The result I'd like would be to notice me with a on-display message with a window having an OK button (like when I use EXCEPTION). which would tell me the condition is verified....

I settled client_min_messages to notice which it should return me a message but it doesn't show me any message...

Shall I have missed something maybe?...

Thanks
Ciao
Luigi