When you press the Dup key, the OS/400 program handles the field as
follows:
- If the field is a character field, the data displayed in the field is
returned to your program as is. A hex 1C is placed at the cursor
position and in the remaining field positions to the right. (Hex 1C
appears as an over-scored asterisk on the display.) The response
indicator, if specified, is set on.
- If the field is a numeric field and you specify a response indicator, a
hex F0 is placed at the cursor position and in the remaining field
positions. The response indicator is set on and returned to your
program. If a response indicator is not specified, hex 1Cs are returned
to your program.
In your program, you can duplicate entire fields (either character or
numeric) with the following procedure:
- Specify, in DDS, two fields for each input-capable field on the
display.
- Specify one field as an input-capable field. For this field,
specify DUP with a response indicator. You may want to specify DUP with
an option indicator that is off on the first display of the field. This
prevents the work station user from using the Dup key when the field is first
displayed.
- Specify the other field as a hidden field (H in position 38).
- On the first output operation, set off an option indicator for DUP.
This prevents the work station user from using the Dup key.
- On the first input operation, move the input-capable field to the hidden
field. This saves the keyed value for later use.
- On each subsequent output operation, set the option indicator on for the
DUP keyword. This allows the work station user to use the Dup
key.
- On each subsequent input operation, test the response indicator specified
with DUP. If the response indicator is off, the input data should be
moved to the hidden field. If the response indicator is on, you can use
the existing value in the hidden field.
- Note:
- When using the DUP keyword in a subfile, an update operation should be
performed after steps 3 and 5 to store the value of the hidden field into the
subfile. This will be returned on the next read of that subfile
record.
- Repeat steps 4 and 5 for subsequent data entry using the Dup key.
You can also duplicate character fields one character at a time by saving
them in arrays, then moving the array one character at a time and checking for
the DUP key indication of hex 1C.
You can achieve duplication of numeric fields one digit at a time by
defining the field as character and eventually moving it to your numeric field
after the hex 1Cs have been removed. You can test whether the Dup key
has been pressed:
- For numeric fields, a response indicator is required.
- For character fields, a response indicator is optional.
The field will contain hex 1C at the cursor position and in the remaining
positions if the Dup key has been pressed.
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