start-of-selection

[Former Member]

Hi All!

I would like to know when exactly start-of-selection event gets triggered in detail.

Thanks.

[Former Member]

Hi shilpa,

1. As soon as we press the EXECUTE button.

regards,

amit m.

[Former Member]

Hi,

START-OF-SELECTION.

Effect

Event keyword:

In an executable program, the corresponding event is processed after the selection screen has been displayed and before data is read using a logical database.

Note

The REPORT statement always executes a START-OF-SELECTION implcitly. Consequently all processing logic between the REPORT statement and the next event keyword is automatically processed in the START-OF-SELECTION event.

Immediately afterwards, the system processes the statements that belong to an explicit START-OF-SELECTION block.

Sameena

[Former Member]

Hi shilpa.

this is the first event for your list once all the events are triggered in selection screen the data is retirve from the database.

[Former Member]

so do the At selection-screen and start-of-selection events both trigger at F8?

[Former Member]

Hi again,

1. No

2. AT SELECTION-SCREEN

EVENT will fire

if we press ENTER KEY

or some radiobutton or button on selection screen.

3. If we press F8,

a) AT SELECTION-SCREEN (will fire first)

b) START-OF-SELECTION (will fire afterwards)

4. to get a taste of it , just copy paste.

5.

report abc.

parameters : a type c.

at selection-screen .

message 'AT SELECTION SCREEN' type 'I'.

start-of-selection.

message 'START OF SELECTION.' type 'I

regards,

amit m.

[Former Member]

Hi Shilpa,

The START-OF-SELECTION Event is triggered by default in a program though you dont code the event in your program.

Thanks,

Krishna

[Former Member]

Hi Shilpa,

At Selection-Screen event is used for field validations like whether the user input is correct or not.

Start-of-selection event is for doing some data manipulation on the user input.

Please read the following, u will get an idea.

Contrary to first appearances, ABAP/4 programs are

event-driven. An event is a tag that identifies a section of code. The section of code associated with an event begins with an event name and ends when the next event name is encountered.

Three Basic Events

1 report ztx1701.

2 initialization.

3 write / '1'.

4

5 start-of-selection.

6 write / '2'.

7

8 end-of-selection.

9 write / '3'.

The code produces the following output:

1

2

3

These are the basic steps followed by each program :

1)It triggers the initialization event, causing the code belonging to

initialization to be executed. If you have not coded an initialization event

in your program, the driver program skips this step.

2)It shows the selection screen for your program. (A selection screen is the

screen that contains the input fields for your parameter statements.) If your

program doesn't have a selection screen, it skips this step.

3)It triggers the start-of-selection event, causing the code belonging to that

event to be executed. If you have not coded a start-of-selection event in your program,

it skips this step.

4)It triggers the end-of-selection event in your program, executing all of the code

belonging to it. If you haven't coded an end-of-selection, it skips this step.

5)It shows the output list to the user.

The order of execution for events is determined by the driver program,

not by your program.Therefore, you can code the events in any order and the execution

order will still be the same. The order of events in your program doesn't matter;

they will always be triggered in the same sequence by the driver program.

There are eleven different events in ABAP/4, categorized in Table 17.1 according to how they are triggered.

ABAP/4 Events

Category Events

Driver initialization

at selection-screen

start-of-selection

get

end-of-selection

User at line-selection

at pfn

at user-command

Program top-of-page

end-of-page

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