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action is taken.
How are the function codes handled in flow logic ?
-
When the user selects a function in a transaction, the system copies the function
code into a specially designated work field called OK_CODE. This field is global
in the ABAP/4 module pool. The OK_CODE can then be evaluated in the
corresponding PAI module.
The function code is always passed in exactly the same way, regardless of
whether it comes from a screen's pushbutton, a menu option, function key or
other GUI element.
What controls the screen flow ?
-
The SET SCREEN and LEAVE SCREEN statements control screen flow.
What are "field" and "chain" statements ?
-
The FIELD and CHAIN flow logic statements let you program your own field
checks. FIELD and CHAIN tell the system which fields you are checking,and
whether the system should perform checks in the flow logic or call an ABAP/4
module.
What is an on "*-input field" statement ?
-
ON *-INPUT
The ABAP/4 module is called if the user has entered a "*" in the first character of
the field, and the field has the attribute *-entry in the Screen Painter. You can use
this option in exceptional cases where you want to check only fields with certain
kinds of input.
What are conditional chain statements ?
-
ON CHAIN-INPUT similar to ON INPUT.
The ABAP/4 module is called if any one of the fields in the chain contains a value
other than its initial value (blanks or nulls).
ON CHAIN-REQUEST
This condition functions just like ON REQUEST, but the ABAP/4 module is called
if any one of the fields in the chain changes value.
What is "at exit-command" ?
-
The flow logic keyword AT EXIT-COMMAND is a special addition to the
MODULE statement in the flow logic. AT EXIT-COMMAND lets you call a module
before the system executes the automatic field checks.
Which function type has to be used for using "at exit-command" ?
-
To use AT EXIT-COMMAND, we must assign a function type `E' to the relevant
function in the Menu Painter or Screen Painter.
What is the difference between SET SCREEN and CALL SCREEN ?
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