Chapter 10_Dynamic Screen Sequence

8/6/2019 Chapter 10_Dynamic Screen Sequence

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2005 IBM CorporationDynamic Screen Sequence | 6.10 March-2005

Dynamic Screen Sequence


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2005 IBM Corporation2 March-2005Dynamic Screen Sequence | 6.10

Objectives

T he participants will be able to:

Know about the next screen attribute for a screen.

Understand the functioning of the following screen navigation commands:LEAVE SCREEN

SET

SCREENLEAVE T O SCREEN

CALL SCREEN


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Overview

Academy Awards

Year

Category

1994

PIC

Academy Awards

Year

Category

1994

PIC

Winner Forrest Gump

Notes

Critic Dean

Currently, the screensequence of our onlineprogram is determined bystatic Next Screenattributes on each screen.

We will learn how todynamically set the screensequence and add a pop-updialog box to enter a criticsname.

Exit Edit Loop

Exit Update

Enter Name

The Shawshank Redemption should have won.


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LEAVE SCREEN Statement

PROCESS BEFORE OUTPUT.

MODULE INITIALIZE.

PROCESS AFTER INPUT.

MODULE ONE.

MODULE TWO.

** PAI Modules **

MODULE ONE INPUT.

. . .

LEAVE SCREEN.

. . .ENDMODULE.

MODULE TWO INPUT.

. . .

ENDMODULE.

Screen 9000

Next Screen

attribute is 9001.

When LEAVE SCREEN is encountered,the system immediately terminates the

current screens PAI event and goes to the PBO eventof the screen specified in the Next Screen attribute.


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SE T SCREEN Statement


FIELD YMOVIE-AAYEAR

VALUES (BETWEEN 1927 AND 1996).

CHAIN.

FIELD: YMOVIE-AAYEAR, YMOVIE-CATEGORY.

MODULE SELECT_LISTING.

ENDCHAIN.

Screen 9000

** MZA06I01 - PAI Modules **

MODULE SELECT_LISTING INPUT.

IF OKCODE = EDIT.

SET SCREEN 9001.

* code to select record from YMOVIE

ENDIF.

ENDMODULE.

Next Screen

attribute is 9000.

When SET SCREEN is encountered,the system temporarily ignores thevalue in the Next Screen attribute

and uses the value specified instead.The current screens PAI processing

is not terminated.


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LEAVE T O SCREEN Statement


FIELD YMOVIE-AAYEAR

VALUES (BETWEEN 1927 AND 1996).

CHAIN.

FIELD: YMOVIE-AAYEAR, YMOVIE-CATEGORY.

MODULE SELECT_LISTING.

ENDCHAIN.

Screen 9000

** MZA06I01 - PAI Modules **MODULE SELECT_LISTING INPUT.

IF OKCODE = EDIT.

* code to select record from YMOVIE

LEAVE TO SCREEN 9001.ENDIF.

ENDMODULE.

Next Screen

attribute is 9000.

When LEAVE TO SCREEN is encountered,the system terminates the current

screens PAI event and immediatelygoes to the PBO event of the screen

specified in the statement.


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CALL SCREEN Statement

Academy Awards

Year

Category

1994

PIC

Winner Forrest Gump

Notes

Critic Dean

Exit Update

The Shawshank Redemption should have won.

Enter critics name

Dean

Titlebar

Exit

Screen 9002 is a Modaldialog box type screenwith a dialog box type

GUI status.

CALL SCREEN 9002 STARTING AT 30 5 ENDING AT 60 10.

This ABAP code would be in a PAI modulefor screen 9001.

Enter Name


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PROCESS BEFORE OUTPUT.MODULE INITIALIZE.


MODULE END.

Screen 9002** MZA06O01 - PBO Modules **

MODULE INITIALIZE OUTPUT.

* set GUI status and titlebar

* depending on screen number

* and clear okcode

ENDMODULE.

** MZA06I01 - PAI Modules **

MODULE END INPUT.LEAVE TO SCREEN 0.

ENDMODULE.

Leaving a Called Screen

Next Screen

attribute is 9002.

Because screen 9002 was called,

SCREEN 0 refers to the calling

screen (9001).


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Demonstration

Demonstration of screen navigation commands in a sample online program.


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Practice

Demonstration of screen navigation commands in a sample online program.


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Summary

T he screen sequence of an online program is determined by Next Screenpointers.

When the system encounters the LEAVE SCREEN ABAP statement, itimmediately terminates the screens PAI event and goes to the PBO event of thescreen specified in the Next Screen attribute.

When the system encounters the SE T SCREEN ABAP statement, ittemporarily overrides the Next Screen attribute with this and the PAIprocessing continues. After all PAI modules are executed, the system goes tothe PBO event of .

When the system encounters the LEAVE T O SCREEN ABAPstatement, it terminates the screens PAI event and immediately goes to the PBOof .T he LEAVE T O SCREEN statement performs the functionality of twostatements: SE T SCREEN and LEAVE SCREEN.


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Questions

Screen Attributes

Short Description

Screen Type

Next screen 9100

Screen 9100

Screen Attributes

Short Description

Screen Type

Next screen

Screen 9100

What happens after all PAI

modules are processed and

the next screen is itself?

What happens after all PAI

modules are processed and

the next screen is blank?

Chapter 10_Dynamic Screen Sequence

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