What is 'selection screen event' in SAP BC-ABA - ABAP Runtime Environment?

selection screen event - Overview

• Component: BC-ABA

• Component Name: ABAP Runtime Environment

• Description: Event of the ABAP runtime environment that occurs during the selection screen processing. The corresponding event keyword is AT SELECTION-SCREEN.

selection screen event - Details

• 
  Key Concepts: 
  Selection screen events are a type of ABAP event that is triggered when a user interacts with a selection screen. This event is used to modify the selection screen dynamically, such as adding or removing fields, changing field labels, or setting default values. It can also be used to perform additional processing before the selection screen is displayed. 
  
  How to use it: 
  Selection screen events are triggered by the user's interaction with the selection screen. To use this event, you must first define the event in the ABAP program. This is done by using the SELECTION-SCREEN statement and specifying the event name. Then, you must write code to handle the event in the AT SELECTION-SCREEN event block. This code will be executed when the user interacts with the selection screen. 
  
  Tips & Tricks: 
  When using selection screen events, it is important to remember that they are only triggered when a user interacts with the selection screen. If you need to perform additional processing before the selection screen is displayed, you should use an INITIALIZATION event instead. 
  
  Related Information: 
  For more information on selection screen events and how to use them in ABAP programs, please refer to SAP Help documentation for BC-ABA ABAP Runtime Environment.