chapter 16_screen modifications and screen flow events

8/12/2019 Chapter 16_Screen Modifications and Screen Flow Events

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2005 IBM CorporationScreen Modifications and ScreenFlow Events | 6.16

March-2005

Screen Modifications and Screen Flow Events


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2005 IBM Corporation2 March-2005Screen Modifications and Screen Flow Events | 6.16

Objectives

The participants will be able to:

Recognize Dynamic screen modification.

Use a mirror image table work area to avoid updating a record that did not change.

Code the PROCESS ON HELP-REQUEST Flow Logic event.

Code the PROCESS ON VALUE-REQUEST Flow Logic event.


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Dynamic Screen Modification (2)

PROCESS BEFORE OUTPUT.

MODULE INITIALIZE.

MODULE MODIFY_SCREEN.

Screen 9001

** MZA11O01 - PBO Modules **

MODULE MODIFY_SCREEN OUTPUT.

* to change to display mode

LOOP AT SCREEN.

IF SCREEN-NAME = YMOVIE-

WINNER OR

SCREEN-NAME = YMOVIE-

NOTES.

SCREEN-INPUT = 0.

MODIFY SCREEN.

ENDIF.

ENDLOOP.

ENDMODULE.

You mustuse a PBO module to

dynamically modify a screen.

Dont forget to update the

changes to the SCREEN

internal table.

Turn the input attribute

off for display mode.

Use the systems SCREEN

internal table.


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Dynamic Screen Modification (3)

Each field on a

screen has a set of

attributes that are

fixed when you

define the screen in

the Screen Painter.When an ABAP

program is running,

a subset of the

attributes of each

screen field can be

addressed using thesystem table

SCREEN.


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Mirror Image

** MZA12TOP - Top Include **

PROGRAM SAPMZA12 MESSAGE-ID

ZA.

TABLES: YMOVIE, *YMOVIE .

Academy Awards

YearCategory

1994PIC

Winner Forrest Gump

Notes Great movie !!!

Critic Ellen

UpdateExit

Enter Name

Change / DisplayTo avoid updating a record that did not

change, we can use a mirror image

of the YMOVIE table work area.

Currently, if the user clicks on the

Update pushbutton, our program will

update the record even if the user did

notmake any changes to it.


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Mirror Image Example

** MZA12I01 - PAI Modules **

MODULE SELECT_LISTING INPUT.

IF OKCODE = EDIT.

* code to select YMOVIE record

IF SY-SUBRC = 0.

MOVE YMOVIE TO *YMOVIE.

ENDIF.

ENDIF.

ENDMODULE.

** MZA12I01 - PAI Modules **

MODULE UPDATE INPUT.

IF OKCODE = UPDA.

IF YMOVIE = *YMOVIE.

MESSAGE S005.

ELSE.

* code to update YMOVIE

ENDIF.

ENDIF.

ENDMODULE.

If a record is selected, it will

be placed in the mirror image

table work area.

If the record has not changed,

a message will be issued and the

record will not be updated.


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. . .

PROCESS AFTER INPUT.

. . .

PROCESS ON HELP-REQUEST.

FIELD YMOVIE-AAYEAR WITH 0001.

Screen 9000

Process on Help-Request

Academy Awards

Year

Category

1994

PIC

F1

Trigger PROCESS ON HELP-REQUEST Flow Logic

event for the particular field. This event will display

the specified supplemental documentation (i.e., 0001).


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. . .


. . .

PROCESS ON HELP-REQUEST.

FIELD YMOVIE-AAYEAR WITH 0001.

Screen 9000

Process on Help-Request (Contd.)

Academy Awards

Year

Category

1994

PIC

F1

Trigger PROCESS ON HELP-REQUEST Flow Logic

event for the particular field. This event will display

the specified supplemental documentation (i.e., 0001).


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F4

Process on Value-Request


. . .


. . .

PROCESS ON VALUE-REQUEST.

FIELD YMOVIE-AAYEAR

MODULE VALUE_LIST.

Screen 9000

Academy Awards

Year

Category

1994

PIC

Trigger PROCESS ON VALUE-REQUEST Flow Logic event

for the particular field. This event will execute the specified

module (i.e., VALUE_LIST).


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Process on Value-Request (Contd.)


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Demonstration

Creating a module pool program and coding the Process on Help-Request andthe Process on Value-Request events in the program to display F1 and the F4

helps.


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Practice

Creating a module pool program and coding the Process on Help-Request andthe Process on Value-Request events in the program to display F1 and the F4

helps.


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Summary

You can dynamically modify a screen. More specifically, screen field attributescan be temporarily modified during the execution of an online program.

To dynamically modify field attributes, use the SCREEN internal table

maintained by the system for each screen.

A mirror image is created with the ABAP statement: TABLES *. The work area created with this statement is identical in structure to theone created with the TABLES statement.

The Process on Help-Request event is triggered when the user presses the F1

key.

The Process on Value-Request event is triggered when the user presses the F4

key.


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Questions

What is the event required for displaying F1 help ?

What is the event required for displaying F4 help ?

What is the system internal table required to be modified for dynamic screen

modifications ?

chapter 16_screen modifications and screen flow events

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