Drill Down

8/11/2019 Drill Down

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A Drill Down Screen

First the user double-clickson a record.

Then a drill down list is

created showing datarelevant to the record initiallyselected by the user.


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The Challenges

First Challenge:

How did the ABAP/4 code know whichrecord the user has double-clicked?

Second Challenge:

How is this record sent back as criteriato an ABAP/4 SELECT statement?


3/27

Illustration

(The AT LINE-SELECTION Event)

A NEWABAP/4

ReservedWord

SYNTAX: AT LINE-SELECTION

When the user double-clicks aline in the report, the AT LINE-SELECTION event occurs.

Determining Whenthe User Is RequestingAdditional Information


4/27

The SY-LISEL System Field

A NEWABAP/4

System Field

SYSTEM FIELD: SY-LISEL

When the user selects a line in thereport, SY-LISEL is updated withthe text from that line.

The Contents of SY-LISEL:

VEND012 QUALITY FABRICATION HOMESTEAD

Determining WhichRecords the User IsRequesting Additional Information Upon


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Coding Example

AT LINE-SELECTION and SY-LISEL

This code is continued on the next page.

REPORT Y190XX02.

TABLES: LFA1.

SELECT * FROM LFA1.WRITE: / LFA1-LIFNR, LFA1-NAME1, LFA1-ORT01.ENDSELECT.


6/27

Coding Example

AT LINE-SELECTION and SY-LISEL

*--------BEGIN OF AT LINE-SELECTION EVENT-----------------------------------*

AT LINE-SELECTION.CHECK SY-LSIND = 1.WINDOW STARTING AT 10 4

ENDING AT 77 12.WRITE: / THE USER DOUBLE-CLICKED A LINE IN THE REPORT.WRITE: / SY-LISEL.

*---------END OF AT LINE-SELECTION EVENT-------------------------------------*


7/27

AT LINE-SELECTION and SY-

LISELFirst double-click ona record.

Then a second drill down list

is created showing data relevantto the record you had initiallyselected.

If you double-click here, willanother drill windowappear? Why or why not?


8/27

Limitations of the SY-LISEL

System Field

The contents of SY-LISEL:

VEND012 QUALITY FABRICATION HOMESTEAD

We cant send an entire string to an ABAP/4 SELECT statement.

SELECT * FROM BSIK WHERE LIFNR =VEND012

However, if we could somehow send onlyindiv idual f ields from the selected record, wewould then process that data with an ABAP/4

SELECT statement.

VEND012


9/27

The HIDE ABAP/4 Reserved

Word

SYNTAX: HIDE[:] ,.

SELECT * FROM LFA1.WRITE: / LFA1-LIFNR, LFA1-NAME1, LFA1-ORT01.HIDE: LFA1-LIFNR.

ENDSELECT.

A NEWABAP/4

ReservedWord

Extracting IndividualFieldsfrom the Record Chosen bythe User


10/27

The HIDE Memory Area

LFA1 WORK AREA

RECORD # 2WRITE: / HIDE

SCREEN MEMORY

SELECT * FROM LFA1.WRITE: / LFA1-LIFNR, LFA1-NAME1, LFA1-ORT01.HIDE: LFA1-LIFNR.

ENDSELECT.


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SELECT * FROM LFA1.WRITE: / LFA1-LIFNR, LFHIDE: LFA1-LIFNR.

ENDSELECT.


(Showing the Index)

MEMORY

LFA1-LIFNR

no valueno valueVEND011VEND012VEND013

INDEX

12345

This is what the HIDE memoryarea and LFA1 work arealook like after the SELECTstatement on above hasfinished processing.

LFA1 WORK AREA

RECORD # 3


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SELECT * FROM LFA1.WRITE: / LFA1-LIFNR, LFA1-NAME1, LFA1-ORT01.HIDE: LFA1-LIFNR, LFA1-TELF1.

ENDSELECT. HIDE MEMORY

LFA1-LIFNRno valueno valueVEND011VEND012

VEND013

INDEX1234

5

LFA1-NAME1no valueno value555-1111555-2222

555-3333


(with More than One Field Stored)

If we used the HIDEcommand to hide bothLIFNR and TELF1, ourHIDE memory areawould look like this.


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The HIDE Index Numbers

VEND012

INDEX1234

MEMORY

LFA1 WORK AREA

LINE 4 from the screen corresponds

with INDEX 4 from the HIDE memory area.

The Correlation between the HIDE Memory Area andLine Numbers

LFA1-LIFNRno valueno value

VEND011VEND012VEND013

INDEX12

345


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Coding Example

Using the HIDE ABAP/4 Reserved Word

REPORT Y190XX02.TABLES: LFA1, BSIK.

SELECT * FROM LFA1.WRITE: / LFA1-LIFNR, LFA1-NAME1, LFA1-ORT01.HIDE: LFA1-LIFNR, LFA1-TELF1.

ENDSELECT.


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What Happens When the System

Hides Values?DATASOURCE

field string

TABLEWORK AREA

HIDE MEMORY

LFA1-IFNR

no valueno valueVEND011VEND012VEND013

INDEX

12345

SCREENlist 0

1 (header)2 (uline)3 VEND011 Star Craft Metal

4 VEND012 Quality Fabr.5 VEND013 Euro Output SA

LFA1-TELF1

no valueno value555-1111555-2222555-3333


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Coding Example

Using the HIDE ABAP/4 Reserved Word

LFA1 WORK AREA

?

*-------BEGIN OF AT LINE-SELECTION EVENT-----------------*AT LINE-SELECTION.CHECK SY-LSIND = 1.

WINDOW STARTING AT 10 4ENDING AT 77 12.

SELECT * FROM BSIK WHERE LIFNR = LFA1-LIFNR.WRITE: / LFA1-LIFNR, BSIK-BELNR.ENDSELECT.*-------END OF AT LINE-SELECTION EVENT--------------------*

Remember... This isreferencing the workarea! The contents ofthe work area are

dependent uponwhich line youdouble-clicked in theon-screen report.


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What Happens When the User

Selects a Valid Line?

data available for further processing

TABLE WORK AREA(Field String)

HIDE MEMORY

LFA1-IFNRno valueno valueVEND011VEND012VEND013

INDEX12345

SCREENlist 0

LFA1-TELF1no valueno value555-1111555-2222555-3333

VEND011

555-1111

OldData

OldData

OldData

OldData

OldData

OldData

OldData

OldData

OldData




18/27

Challenges Revisited

Second Challenge:

How is this record sent back as criteria toan ABAP/4 SELECT statement?

METHOD: HIDE memory area.

First Challenge:

How did the ABAP/4 code know which

record the user has double-clicked?

METHOD: Combination AT LINE-SELECTION and HIDE memory area.


19/27

Is the User Selecting a Valid

Line in the Report?Restart the program anddouble-click the header.


20/27

Is the User Selecting a Valid

Line in the Report?Restart the program and double-clickon the header. What happens?

Where does this data come from?


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What Happens When the User

Clicks on an Invalid Line First?

no data written from hide into work area.

last record read by select statement is still in work area:still available for further processing.

HIDE MEMORY

LFA1-IFNRno valueno value

VEND011VEND012VEND013

INDEX12

345

SCREENlist 0

LFA1-TELF1no valueno value

555-1111555-2222555-3333

VEND-OR2

999-9999 PA USA 19103

Mr.Jones $100

NET30Phila.

123Main

BaconInc.




22/27

Illustration

The END-OF-SELECTION Event

SYNTAX: END-OF-SELECTION.

A NEWABAP/4

ReservedWord

After all of the otherevents have been

executed END-OF-SELECTION

occurs here

But before the data isactually painted to

the screen


23/27

Coding Example

Using the END-OF-SELECTIONEvent to Clear the Work AreaHIDE LFA1-LIFNR.

ENDSELECT.

*---------BEGIN OF END-OF-SELECTION EVENT---------------*END-OF-SELECTION.CLEAR LFA1-LIFNR.*---------END OF END-OF-SELECTION EVENT------------------*

*---------BEGIN OF AT-LINE SELECTION EVENT---------------*AT LINE-SELECTION.CHECK SY-LSIND = 1.CHECK NOT LFA1-LIFNR IS INITIAL.

Enter this code.1

2


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Click on a Valid Line First

data available for further processing


HIDE MEMORY


INDEX12345

SCREENlist 0


VEND011

555-1111

1 (header)2 (uline)3 VEND011 Star Craft Metal4 VEND012 Quality Fabr.

5 VEND013 Euro Output SA


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Then Click on an Invalid Line


HIDE MEMORY


INDEX12345

SCREENlist 0


VEND011

555-1111

1 (header)2 (uline)3 VEND011 Star Craft Metal4 VEND012 Quality Fabr.

5 VEND013 Euro Output SA

nothing moved from hide memory area;data hidden on the last line selected by the user

is still in the work area


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Coding Example

Clearing the Work Area after Each UseHIDE LFA1-LIFNR.ENDSELECT.

*---------BEGIN OF END-OF-SELECTION EVENT---------------*END-OF-SELECTION.

CLEAR LFA1-LIFNR.*---------END OF END-OF-SELECTION EVENT------------------*

*---------BEGIN OF AT-LINE SELECTION EVENT---------------*AT LINE-SELECTION.CHECK SY-LSIND = 1.CHECK NOT LFA1-LIFNR IS INITIAL.

WINDOW STARTING AT 10 4ENDING AT 77 12.

SELECT * FROM BSIK WHERE LIFNR = LFA1-LIFNR.WRITE: / LFA1-LIFNR, BSIK-BELNR.CLEAR LFA1-LIFNR.*---------END OF AT LINE-SELECTION EVENT------------------*

1

2

Enter this code.


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Flow of Data

DATASOURCE

SCREEN#1

HIDEMEMORY

WORK AREA

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