Chapter 2-4: Files and Fields |
Logic Fields
A logic field is a checkbox with possible values of 'yes' The Logic fields overlay, shown below, permits you to add logic-specific attributes to those already defined for the field. It automatically displays after you complete the entries on the Fields specifications screen if the Field Type you select is LOGIC.
Logic Fields Overlay The Logic fields overlay contains the following attributes:
Blank OK? indicates, for information only, whether a user should be permitted to leave a field referencing this domain blank on an input image. (Whether or not such a field can actually be left blank is controlled by the image item specification 'Required?'.) The default is 'no' Default Value establishes a starting value for image items whenever they first display in add mode on an input image, unless modified by a user. The Default Value options are blank (for unknown), Y or N. Descriptive provides a longer, more easily understood alternative to Field Name, one that is not required to be unique within an application. If blank at all default levels, Field Name is used. Column Headings designates up to two lines of column heading text. The APPX output process facility uses this text to generate standard column heading images for Start of Page and Start of Range class frames. For cosmetic reasons, the length of headings should not exceed the length of a field itself. Refer to Standard Column Heading Image for additional information. The Logic fields overlay offers one option described in the following section: Additional Attributes. |
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, 'no' 
, or "unknown" 
(Y, N or blank using Character Mode). Examples include various application parameters such as whether or not to post transactions on an accrual basis, and control fields that govern the execution of subroutines based upon an exists/does not exist condition.