07 selection screens, list events student version

7/17/2019 07 Selection Screens, List Events Student Version

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3/22/20

SELECTION SCREENS AND

LIST PROCESSING EVENTS

Spring 2011 Enterprise Programming

Getting Data from User at Runtime

PARAMETERS is the most basic type of input acceptance.

Using Parameters generates a default selection screen—screen

1000.

If the type of item prompted is based on a global type this allows

input help (F1) and entry selection help (F4) are shown as defined in

the ABAP dictionary.

PARAMETERS: carrier TYPE sflight-carrid,

fltdate TYPE sflight-fldate.



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Event blocks

An ABAP program is a collection of processing blocks.

Event blocks—called by runtime environment when related event

has been triggered through natural program flow of control or

.

Our initial programs—one block—so no need to declare event blocks.

Program event blocks:

LOAD-OF-PROGRAM (called at initial program setup)

START-OF-SELECTION (beginning of main processing)

Exam le use: PARAMETERS tri ered at be innin of main

processing. If want to set a default value for field based on

processing (calculation, data retrieval), must do this beforeSTART-OF-SELECTION.

Example

PARAMETERS date LIKE sy-datum DEFAULT sy-datum.

WRITE date.

DATA pastdate LIKE sy-datum.

pastdate = pastdate - 7.

PARAMETERS date LIKE sy-datum DEFAULT pastdate.

WRITE date.

LOAD-OF-PROGRAM.

DATA pastdate LIKE sy-datum.

pastdate = sy-datum - 7.

PARAMETERS date LIKE sy-datum DEFAULT pastdate.

START-OF-SELECTION.

WRITE date.



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Selection Screen Input

Selection screen display and control can incorporate additional

elements beyond PARAMETERS to provide additional GUI controls.

Covered previously:

e ect on exts c anges prompt ng assoc ate w t .

More on Parameters--checkboxes

PARAMETERS can be designated AS CHECKBOX.

PARAMETERS: myvar AS CHECKBOX.

Use DEFAULT 'X' to have it toggled on initially.

PARAMETERS: myvar AS CHECKBOX DEFAULT 'X'.

Test if user selected by seeing if variable set to 'X'.

myvar = ."code here.

ENDIF.



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More on Parameters--checkboxes

PARAMETERS: male AS CHECKBOX, female AS CHECKBOX.

IF male = 'X'.

WRITE / 'You are male!'.

ENDIF.

IF female = 'X'.

WRITE / 'You are female!'.

ENDIF.

More on Parameters--radio buttons

PARAMETERS can be designated as part of a radiobutton group.

PARAMETERS: choice1 RADIOBUTTON GROUP grpa,

choice2 RADIOBUTTON GROUP grpa,

.

Maximum group name length--4 characters

Use DEFAULT 'X' to have it toggled on initially.

PARAMETERS: choice1 RADIOBUTTON GROUP grpa DEFAULT 'X'.

Test if user selected by seeing if variable set to 'X' or use a CASEstatement.

.WHEN choice1.

WHEN choice2.

…

ENDCASE.



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More on Parameters--radio buttons

PARAMETERS: male RADIOBUTTON GROUP gen,

female RADIOBUTTON GROUP gen.

IF male = 'X'.


ENDIF.

IF female = 'X'.


ENDIF.



CASE 'X'.

WHEN male.


WHEN female.


ENDCASE.

PARAMETERS: myvar AS CHECKBOX.

PARAMETERS: choice1 RADIOBUTTON GROUP grpa,

choice2 RADIOBUTTON GROUP grpa,

choice3 RADIOBUTTON GROUP grpa.

IF myvar = 'X'.

WRITE / 'You chose the checkbox'.

.

WRITE / 'You did not choose the checkbox'.

ENDIF.

CASE 'X'.

WHEN choice1.

WRITE / 'You picked choice1'.

WHEN choice2.


WHEN choice3.


WHEN OTHERS.

WRITE / 'You did not pick a choice!'.

ENDCASE.



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Selection Screen refinements

To exert further control over selection screen use SELECTION-SCREEN

statement.Can add 1 or more framed blocks with optional title.

- name e.



SELECTION-SCREEN END OF BLOCK name.

CASE 'X'.

WHEN male.


WHEN female.


ENDCASE.

LOAD-OF-PROGRAM.

title = 'Choose a gender'.

Multiple items on a line

To place multiple items on a single output line, place control

definitions within a SELECTION-SCREEN BEGIN OF LINE/ SELECTION-

SCREEN END OF LINE block.

- name

TITLE title.

SELECTION-SCREEN BEGIN OF LINE.

PARAMETERS: var1 TYPE i,

var2 TYPE i,

var3 TYPE i.

SELECTION-SCREEN END OF LINE.


LOAD-OF-PROGRAM.

title = 'Enter choices'.



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Supplemental Text

COMMENT can be used to place text on the form.

Must use column and length format specifier.SELECTION-SCREEN BEGIN OF BLOCK name WITH FRAME

TITLE title.


SELECTION-SCREEN COMMENT 1(40) comment.


var2 TYPE i,

var3 TYPE i.

- .


LOAD-OF-PROGRAM.


comment = 'Enter your three favorite numbers'.

SELECTION-SCREEN BEGIN OF BLOCK name WITH FRAME TITLE title.



PARAMETERS: male RADIOBUTTON GROUP gen.

SELECTION-SCREEN COMMENT 12(6) comment2.

PARAMETERS: female RADIOBUTTON GROUP gen.



CASE 'X'.

WHEN male.


WHEN female.


.

LOAD-OF-PROGRAM.

title = 'Choose a gender'.

comment = 'Male'.

comment2 = 'Female'.



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Allowing range of values selection

Allows user to select a range of values.

SELECT-OPTIONS itabname FOR dataobject.User entry stored in internal table itabname. 4 fields:

— —included or excluded from selection

Low—the lower limit or a single value (if only one specified)

High—the upper limit

Option—text such as EQ, NE, GE, GT, LE, LT (if only Lowspecified). [Other options not presented here]

on ro yp ca y use w a a ase query opera ons anclause particularly adjusted to correspond with this resource.

SELECT fields FROM table WHERE value IN itabname.(Used as a field limiter if selected, so if not populated all values

returned.)

Allowing range of values selection

DATA str TYPE spfli.

SELECT-OPTIONS userair FOR str-carrid.

SELECT carrid connid cityfrom cityto FROM spfli INTO

CORRESPONDING FIELDS OF str WHERE carrid IN userair.

WRITE: / str-carrid, str-connid, str-cityfrom,

str-cityto.

ENDSELECT.



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var2 TYPE i.




PARAMETERS var3 TYPE i.



LOAD-OF-PROGRAM.



comment2 = 'Put your most favorite here'.


SELECTION-SCREEN BEGIN OF LINE.SELECTION-SCREEN COMMENT 1(40) comment.

PARAMETERS: var1 TYPE i.


PARAMETERS: var2 TYPE i.




PARAMETERS var3 TYPE i.


- name.

LOAD-OF-PROGRAM.



comment2 = 'Put your most favorite here'.



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Data Validity Testing

Validation of screen input can be done on the AT SELECTION-SCREEN

event.Useful if want to require user data entry before main processing.

- .

Triggered if fieldname was submitted.

If an error or warning is issued, the field is highlighted.

AT SELECTION-SCREEN ON RADIOBUTTON GROUP grpnam.

If an error or warning is issued, the group is highlighted.

Data Validity Testing




, , .



AT SELECTION-SCREEN ON var2.

IF var2 = 7.

MESSAGE 'Sevens are bad!' TYPE 'W'.

ENDIF.



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Let's Practice

Let's Practice



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List output events

We now move from input and related events to output and a related

event.

AT LINE-SELECTION EVENT

When outputting a list, the AT LINE-SELECTION event is triggered

when a line is double clicked or the user chooses the choose icon.

SY-LSIND starts out at 0 for the initial list output and is incremented

.

BACK.

START-OF-SELECTION.

WRITE: /'hello', 'sy-lsind', sy-lsind.

AT LINE-SELECTION.

When writing in AT LINE-SELECTION, this is called a detail list and

its output appears as a new list.

WRITE: /'Now at selection level', sy-lsind.



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Retrieving values from selected line

When list is output, HIDE can be used to designate values that will be

passed on (called a data transport) when line is selected.The data object to be hidden may or may not be a part of the output

.

TYPES spfli_table_type TYPE STANDARD TABLE OF spfli.

DATA itable_spfli TYPE spfli_table_type.

DATA str LIKE LINE OF itable_spfli.

DATA str2 TYPE sflight.

SELECT carrid connid airpfrom airpto deptime FROM spfli INTO

CORRESPONDING FIELDS OF TABLE itable_spfli.

LOOP AT itable_spfli INTO str.

WRITE: / str-carrid, str-connid, str-airpfrom, str-airpto,

str-deptime.

HIDE: str-carrid, str-connid.

ENDLOOP.

AT LINE-SELECTION.

IF sy-lsind = 1.

WRITE: 'F g ts or connect on', str-carr , str-conn .SELECT fldate seatsmax seatsocc FROM sflight INTO CORRESPONDING

FIELDS OF str2 WHERE carrid = str-carrid AND connid =

str-connid.

WRITE: / str2-fldate, str2-seatsmax, str2-seatsocc.

ENDSELECT.

ENDIF.



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Copyrights

Presentation prepared by and copyright of Dr. Tony

Pittarese, East Tennessee State University, Computer and

Information Sciences Dept. ([email protected])

Podcast lecture related to this presentation available via

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07 selection screens, list events student version

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