In SAP ABAP, selection screens provide a user interface for entering data and selecting options before executing a program. Selection screen events are triggered by user actions on the selection screen and allow you to perform specific actions or validations. Here are some of the commonly used selection screen events in SAP ABAP: Following details showing about Different Types of Selection Screens events.
AT SELECTION-SCREEN: This event is triggered when the user presses the Enter key or clicks the Execute button on the selection screen. It is often used to perform validations on the entered data before executing the program.
AT SELECTION-SCREEN OUTPUT: This event is triggered after the selection screen is displayed but before the user interacts with it. It is typically used to modify the appearance of the selection screen elements dynamically.
AT SELECTION-SCREEN ON: This event is triggered when the user changes the value of a selection screen parameter or selects/deselects a checkbox or radio button. It allows you to react to these changes and perform related actions.
AT SELECTION-SCREEN RESUME: This event is triggered when the user resumes an interrupted selection screen processing. It is useful when you have a long-running program that can be paused and resumed.
AT SELECTION-SCREEN ON BLOCK : This event is triggered when the user interacts with a specific block of the selection screen. It allows you to define block-specific actions and validations.
AT SELECTION-SCREEN ON VALUE-REQUEST: This event is triggered when the user presses the F4 key or uses the matchcode button for a particular field. It enables you to provide additional value help or selection options for the field.
AT SELECTION-SCREEN ON HELP-REQUEST: This event is triggered when the user presses the F1 key or uses the help button for a particular field. It allows you to provide help documentation or context-specific assistance for the field.
These are some of the commonly used selection screen events in SAP ABAP. Depending on your requirements, you can use these events to enhance the functionality and interactivity of your programs.
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 be 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.