| Different Types of Selection
Screens
What is:
1. at selection-screen on field
2. at selection-screen output
3. at selection-screen block
4. at selection-screen on value-request
5. at selection-screen on help-request and their difference?
For knowing Selection-screens:
First you must have right understanding of Events.
- Events are introduced by Event Keyword. They
end when again next processs begins.
Selection-screens are special screen defined in ABAP.
- This ABAP at run time only controls the flow logic
of Selection-screens. The PBO and PAI triggers the num of. selection-screens.
The basic form of the selection screen events is the AT
SELECTION-SCREEN event. This event occurs after the runtime environment
has passed all input data from the selection screen to the ABAP program.
The other selection screen events allow programmers to modify the selection
screen before it is sent and specifically check user input.
At Selection-screen OUTPUT is trigerred in PBO of selection-screen.
- This allows you to modify the Selection-screen, before
it is displayed.
At Selection-screen On Field is triggered in PAI of selection-screens.
- The input fields can b checked,in the corresponding
event block. If an error message occurs within this event block, the corresponding
field is made ready for input again on the selection screen.
At Selection-screen On Block is trigerred in PAI event.
- You define a block by enclosing the declarations
of the elements in the block between the statements SELECTION-SCREEN BEGIN
OF BLOCK block - END OF BLOCK block. You can use this event block to check
the consistency of the input fields in the block.
At Selection-screen On value request.
- This event is trigerred for F4 help.
At Selection-screen On help request .
- This event is triggered when the user clicks F1 for
help on fileds.
Tips by : Shilpa Priya
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