Monitoring changes in form

Hey all,
Got an easy one for you guys.
I'm working with the composer to create a bunch of forms. I've got an options screen and I want to know what's the best way of monitoring changes so the OK and CANCEL buttons work accordingly.
Cheers.

I don't think there is a "best" way, as usual in such questions...
The conditions to enable or disable buttons depending on GUI state can be pretty complex. I am a first believer that the GUI should provide hints (like disabling buttons that cannot be used in a given context) rather than "punish" the user by offering all options then telling her she cannot do a given action because some conditions are not fulfilled (like we still see too often in user interfaces, particularly the Web-based ones...).
But there is no perfect recipe for this, because conditions are varied and can be complex. In general, you have to watch text field input (is it correct, non empty, following the given rules like excluding some chars in a file name, etc.), list selection (at least one selected, no more than n selected, etc.), check box states that can exclude themselves (sometime radio buttons are better in this case), and so on.
It might be easier to disable all buttons doing an action (load, save, delete, rename, OK, etc.) then to enable them only when the conditions are meet (something in the tree is selected OR something have been typed AND user selected a folder where she has a right, etc.). Such GUI asks for lot of testing, too...

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If u r satisfied give points..
By
Firos.C
Edited by: firoz101 on Jul 31, 2009 7:03 AM
Edited by: firoz101 on Jul 31, 2009 7:04 AM

Monitoring changes in form

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