At Selection Screen Output?

At Selection Screen output is a selection-screen event, which is used to manipulate dynamic changes on selection-screen. Loop At Screen. Screen is structure with Name, Group1, Group2, Group3, Group4, invisible, active, intensified etc fields, this holds the screen information at run time, Loop at Screen...

What is the use of at selection screen output event?

ENDLOOP. This event is raised by the dynpro event PAI of a selection screen if the content of the input field of a parameter para or a line of a selection criterion selcrit was passed to the ABAP program. The user input can be checked in this event block.

What is difference between AT selection screen and at selection screen output?

At selection-screen output is triggered when the selection screen is loaded in memory before being displayed. The event AT SELECTION-SCREEN is the basic form of a whole series of events that occur while the selection screen is being processed.