Undo changes!!!!

Question

Hi All
I have add,edit,save,cancel button in my form.If user clicks on edit button then he has 2 option either he press save button to save changes or he can press cancel button to undo changes .I am facing problem in 2nd option i.e if user clicks on cancel button then the changes become undo and record must stays(same record should be shown in form) as it was before pressing edit button.
I shall be very thankful for any reply.
Regards

Answer 1

Undo feature should be done in this way--no re-query needed that was bullet-proofed:
1) for database items:
IF GET_ITEM_PROPERTY(:SYSTEM.CURSOR_ITEM,UPDATE_COLUMN) ='TRUE' THEN
Copy(Get_Item_Property(itm, Database_Value), :System.Cursor_Item);
END IF;
2) for no-database item (e.g. show the name item from lookup table per ID in table):
IF :System.Cursor_Item ='TRACK_DEV.DEV_TYPE' Then
:TRACK_DEV.DEVTYPE_DB := Get_Item_Property('TRACK_DEV.DEVTYPE_DB', Database_Value);
SELECT DEVICE_TYPE INTO :TRACK_DEV.DEV_TYPE
FROM DEVICE_TYPE_LOOKUP
WHERE TYPE_ID = :TRACK_DEV.DEVTYPE_DB;
END IF;
--where above, the :TRACK_DEV.DEV_TYPE is no-database item for user to see on form, but hidden item :TRACK_DEV.DEVTYPE_DB, its column name property=TYPE_ID in the table DEVICE_TYPE_LOOKUP.
--You need to take care of the mouse or keyborad navigation properties per your coding style. In a word, you need to make it behaves as smooth as your users expect.
On metalink quest, I showed my codes to some developers, and they emailed me that they greatly like it like a charm.
John G. Feng