interactive - chapter 04 v1

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Copyright IBM Corporation 20031.3.4 |Slide 1

ABAP is an Event-Driven Language

Starts at the

beginningof the code

Completes

at the end

of the code

event-driven Language

The events can execute

in any order. Some may

never even execute at all.

1st

3rd

2nd

VSProcedural Language

Event z

Event y

Event x

Event w


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List Display EventAT PF##

Triggered by function code:

PF##


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REPORT Y190XX01.

TABLES: LFA1.

START-OF-SELECTION.

SELECT * FROM LFA1.

WRITE: / LFA1-LIFNR, LFA1-NAME1, LFA1-ORT01.

ENDSELECT.

AT PF06.

WRITE: / The user has just pressed the F6 key.

SYNTAX: AT PF.

PF## Coding Example

A New

ABAP

Event

.

SELECT

* SY-SUBRC

CHECK


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F1 Reserved for the Help function

F2 The user will press the F2 key to

select a specific line of interest

in your report.

F3 The user will press the F3 key togo back one screen in your report.

Just as a test, place your mouse

on the green back arrow on the ABAP

Editor toolbar. What

does the little yellow flag say?

F4 The user will press the F4 key to see

possible values that can be enteredinto a field.

F10 The user will press the F10 key

to switch into menu select mode.

Try it. Go to the ABAP Editor and

press F10.

F12 The user will press the F12 key to

quit. Its the same as clicking on the

red X that is located on the ABAP

Editor toolbar.

F15 (Shift + F3) The user will press theF15 key to End. Its the same as

clicking on the yellow up arrow that is

located on the ABAP Editor toolbar.

F21 (Shift + F9) The user will press the

F21 key to scroll to the beginning.


F22 key to scroll back one page.F23 (Shift + F11) The user will press the

F23 key to scroll forward one page.


F24 key to scroll to the end.

Function Keys Reserved by ABAP


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Coding ExampleAT PF## with Multiple Events

.

.

REPORT Y190XX01.

TABLES: LFA1.

START-OF-SELECTION.

SELECT * FROM LFA1.

WRITE: / LFA1-LIFNR, LFA1-NAME1, LFA1-ORT01.

ENDSELECT.

AT PF06.WRITE: / The user just pressed the F6 key.

AT PF07.

WRITE: / The user just pressed the F7 key.

When the user pressesthe F6 key only the

code between the twoarrows will execute.


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*--BEGIN OF AT PF06 EVENT MODULE.-----------------------------------------

AT PF06.


*--END OF AT PF06 EVENT MODULE.--------------------------------------------

*--BEGIN OF AT PF07 EVENT MODULE.-----------------------------------------

AT PF07.


*--END OF AT PF07 EVENT MODULE.--------------------------------------------

Commenting Events in ABAP

Commenting in this manner helps to make the start and

end of an event more apparent.


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Coding ExampleOpening a Window

SYNTAX: WINDOW STARTING AT ENDING AT .

.

.

REPORT Y190XX01.

TABLES: LFA1.

START-OF-SELECTION.

SELECT * FROM LFA1.

WRITE: / LFA1-LIFNR, LFA1-NAME1, LFA1-ORT01.ENDSELECT.

AT PF06.

WINDOW STARTING AT 10 4

ENDING AT 77 12.


AT PF07.


A New

ABAP

Reserved

WordSELECT *

SY-SUBRC

CHECK


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TITLE

COLUMN 10 COLUMN 77

TITLEROW 4

ROW 12

SYNTAX: WINDOW STARTING AT ENDING AT .

WINDOW STARTING AT ENDING AT...


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Potential Problems with

Creating Additional Screens

1.

2.

3.

Hey!?!

Whatsup here???


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The SY-LSIND System Field

Basic List

SY-LSIND = 0

1st Detail List

SY-LSIND = 1

2nd Detail List

SY-LSIND = 2

A New

ABAP

System FieldSYSTEM FIELD: SY-LSIND

F6 F6


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AT PF06.

CHECK SY-LSIND = 1.

WINDOW STARTING AT 10 4

ENDING AT 77 12.

WRITE: / SY-LSIND =, SY-LSIND.


AT PF07.


Coding ExampleSY-LSIND System Field

Check that SY-LSIND is equal

to 1.

If SY-LSIND is not equal to one,

then the rest of the AT PF06

event block does not execute.


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Here SY-LSIND is equal to 0.The user attempts to createanother list.

The user attempts to create another list,

but cannot because CHECK SY-LSIND = 1

returns false. The contents of the initial

list remain unchanged.

Now SY-LSIND is equal to 1.

Strategies for Dealing with Detail Lists using the SY-

LSIND System Field


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Here SY-LSIND is equal to 0. The

user attempts to create another list.

Now SY-LSIND is equal to 1.

The user creates another list and the

contents of the previous list are replaced.

Strategies for Dealing With Detail Lists using the SY-

LSIND System Field


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A NewABAP

Event

SYNTAX: TOP-OF-PAGE.

Prior to the TOP-OF-PAGE

event, column headings

were managed via text

elements. The TOP-OF-

PAGE event allows you to

manage your column

headings through code.

START-OF-SELECTION.

SELECT * FROM LFA1.

WRITE: / LFA1-LIFNR, LFA1-NAME1,

LFA1-ORT01.ENDSELECT.

*-----BEGINNING OF TOP-OF-PAGE EVENT -----*

TOP-OF-PAGE.

WRITE: / This is the header of the basic list.

*-----END OF TOP-OF-PAGE EVENT-----------------*

AT PF06.

CHECK SY-LSIND = 1.


SELECT *SY-SUBRC

CHECK

Programmatically Managing

Column Headings for Your Report


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*-------------------BEGINNING OF TOP-OF

TOP-OF-PAGE.

WRITE: / This is the header of the basic list.

*-------------------END OF TOP-OF-PAGE

* ----BEG. OF TOP-OF-PAGE DURING LINE-SELECTION EVENT--------*

TOP-OF-PAGE DURING LINE-SELECTION.

WRITE: / This is the header of the detail list.

*------END OF TOP-OF-PAGE DURING LINE-SELECTION EVENT--------*

*------------------- BEGINNING OF AT PF06 EVENT-------------------------------*

AT PF06.

CHECK SY-LSIND = 1.


Coding ExampleProgrammatically Managing the Column Headings for Your Drill-Down

Windows

The TOP-OF-PAGE DURING

LINE-SELECTION event allows

you to manage the column

headings of the detail lists

through code.

SYNTAX: TOP-OF-PAGE DURING LINE-SELECTION.

A New

ABAP

Event

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