Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!mit-eddie!bbn!apple!rutgers!att!tellab5!kenk
From: kenk@tellab5.tellabs.CHI.IL.US (Ken Konecki)
Newsgroups: comp.sys.mac.hypercard
Subject: Checking for field changes
Message-ID: <1266@tellab5.tellabs.CHI.IL.US>
Date: 7 Apr 89 12:53:30 GMT
References: <1100@atux01.UUCP> <89096.04:03:29.AXS101@PSUVM> <1114@atux01.UUCP>
Reply-To: kenk@tellab5.UUCP (Ken Konecki)
Organization: Tellabs, Inc., Lisle, IL
Lines: 28

In article <1114@atux01.UUCP> jlc@atux01.UUCP (J. Collymore) writes:
> HOWEVER, I want to be able to have the field
>sense either a mouseClick, or KeyClick so that it will be able to tell me when a
>user has modified (i.e., tampered with a data in that field)!
>
>If anyone can tell me how to do this I would REALLY appreciate it.  Thanks

The easiest way to check for field changes is to have a closeField
handler for the field:
    on closeField
	-- Do what you need to do when the field is changed
    end closeField.

A good example is the address stack that comes with
Hypercard.  The address field has a closeField handler that puts
the date in the date field, so the date of last change is part of the
card. Of course, a closeField handler won't tell you that a field has
actually changed. A person might have just clicked in the field, then
changed her mind without modifying the text. Hypercard will still send
a closeField message when the user clicks elsewhere on the card.

Hope that helps,
    -Ken K
-- 
Ken Konecki
"A squeegee by any other name wouldn't sound as funny"
e-mail:kenk@tellab5.UUCP    -or-    ...!uunet!tellab5!kenk	
U.S. Mail: 1271 Portchester Circle, Carol Stream, IL 60188