|
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
Get help for your ABAP problems
Do you have a ABAP Question?
SAP Books
SAP Certification, Interview
Questions, Functional, Basis Administration and ABAP Programming Reference
Books
ABAP Tips
ABAP Forum for Discussion and Samples
Program Codes for Abapers
Best regards,
SAP Basis, ABAP Programming and Other IMG Stuff
http://www.sap-img.com
All the site contents are Copyright © www.sap-img.com
and the content authors. All rights reserved.
All product names are trademarks of their respective
companies. The site www.sap-img.com is in no way affiliated with
SAP AG.
Every effort is made to ensure the content integrity.
Information used on this site is at your own risk.
The content on this site may not be reproduced
or redistributed without the express written permission of
www.sap-img.com or the content authors.
|