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ABAP Events | 4.02 March-2005 © 2005 IBM Corporation

ABAP Events

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Objectives

The participants will be able to: Interpret ABAP Event-Driven Programming. Identify the System Triggered events that are executed during runtime of a Report

program Identify the User Invoked List Display events, that are triggered after the report has

generated the basic list.

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REPORT ZPB001.

TABLES: BSIK.DATA: VAR1(4) VALUE ‘0001’.

GET BSIK. IF SY-LINNO < 5. WRITE: / BSIK-LIFNR, VAR1. ENDIF.

END-OF-SELECTION. WRITE: / ‘END-OF-SELECTION’, ‘has occurred’.

START-OF-SELECTION. WRITE: / ‘START-OF-SELECTION’, ‘has occurred’.

Program Code Program List Flow Produced

1

3

2

Program Header

START-OF-SELECTION has occurred100000 0001END-OF-SELECTION has occurred

ABAP Event-Driven Programming

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Runtime Event : INITIALIZATION

Execute a processing block before the selection screen

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Runtime Event : AT SELECTION-SCREEN

Trigger a function codeon the selection screen

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Runtime Event: START-OF-SELECTION

Can be coded explicitly, but need not be.

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Runtime Events : GET and GET LATE

Select recordsfrom logical

database tables

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Runtime Event : END-OF-SELECTION

Last system event to occur.Occurs only once

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Output Event : TOP-OF-PAGE

Used for page headersfor the basic list only

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Output Event : TOP-OF-PAGE DURING LINE-SELECTION

Used for page headerson detail lists

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Output Event : END-OF-PAGE

Used for page footers

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Demonstration

Observe the following system-triggered events during execution of a Report program.

INITIALIZATION. AT SELECTION-SCREEN. START-OF-SELECTION. GET <table>. GET <table> LATE. END-OF-SELECTION. TOP-OF-PAGE. END-OF-PAGE.

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Practice

Observe the following system-triggered events during execution of a Report program.

INITIALIZATION. AT SELECTION-SCREEN. START-OF-SELECTION. GET <table>. GET <table> LATE. END-OF-SELECTION. TOP-OF-PAGE. END-OF-PAGE.

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List Display (User) Events

Order of execution determined by user

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List Display Event : AT PF##

Triggered by function code

PF##PF##

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List Display Event : AT LINE-SELECTION

Triggered by function code

PICKPICK

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List Display Event : AT USER-COMMAND

Triggered by function code

All Others All Others besidesbesides

PICK or PF##PICK or PF##

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Demonstration

Observe the following user-invoked List Display events after the Basic List has been generated by a Report Program.

AT PF##. AT LINE-SELECTION. AT USER-COMMAND.

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Practice

Observe the following user-invoked List Display events after the Basic List has been generated by a Report Program.

AT PF##. AT LINE-SELECTION. AT USER-COMMAND.

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List Display Events (“User” Events) - Typical Usage

Event Triggered byFunction Code

Typical UserAction Assigned

AT PF## PF## Function keypressed

AT LINE-SELECTION PICK Mouse double-click, Or single click + F2

AT USER-COMMAND ALL OTHER CODES Click on a push- button, or select a menu item

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When Is a List Displayed?

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Summary

Flow of an ABAP program is controlled by events. Execution order of events does not depend on the order in which they are coded in the program.

All ABAP statements that are not coded as part of an event, are part of the event START-OF-SELECTION. This event does not need to be coded explicitly in an ABAP program. It gets triggered automatically.

END-OF-SELECTION is the last system triggered event to be processed during the runtime of a program. It occurs after all database retrievals has finished and before any User-invoked events. It occurs only once during the execution of an ABAP program.

AT PF## (when any Function key is pressed), AT LINE-SELECTION (when the user double-clicks on a line) and AT USER-COMMAND (Clicking on a pushbutton or selecting a menu item) are three different user-invoked events that are handled from an ABAP program.

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Questions

What are the different events in an ABAP program that can be triggered before user interaction ? When do they get triggered ?

What are the user-invoked events for a list display ? What are the events used for displaying Headers and Footers in a list ? When

are these events invoked ? Which part of a code in a program are executed for an event ?