Event in ABAP report

Event in ABAP report determine process flow of a program. The events are triggered depended on the way the output is generated. They begin after event keyword and end when the next event reached.

Event Keyword:
Initialization.
Occurs when report initialized.
We can use it to check user authorization or prepare output for selection screen.

At selection-screen output:
Occurs each time selection screen about to generated.
We can use it to modify selection screen, for example hide/unhide parameter.

At selection-screen.
Occurs each user command in selection screen. We can use it to perform checking on user input.

Start-of-selection
Occurs after the standard selection screen has been processed .,
Data is read in this event.

End-of-selection
Occurs after start-of-selection.

Top-of-page
Occurs when a new page starts.
Use it for write report header.

End-of-page
Occurs when a page ends.
Use it for write report footer.

At line-selection
Occurs when the user double-click on report.

At user-command
Occurs when the user push toolbar button.

This is program to demonstrate how to use event properly.

Report zaalgal0008
Line-count 10 (1 ).

* Http://abap-gallery.blogspot.com

Tables: sflight.

Data: Begin of t_report occurs 3,
Carrid like sflight-carrid,
Connid like sflight-connid,
End of t_report.

* Begin selection screen
Parameters p_datum like sy-datum.
Parameters p_check as checkbox.
* End selection screen

Initialization.
* Begin initialization
Move sy-datum to p_datum.
* End Initialization

At selection-screen.
* Begin at selection-Screen
Message i888 (sabapdocu) with 'at selection-screen '.
If p_check = 'x '.
Message e888 (sabapdocu) with 'clear checkbox '.
Endif.
* End at selection-Screen

At selection-screen output.
* Begin at selection-screen output
Message i888 (sabapdocu) with 'at selection-screen output '.
* End at selection-screen output

Start-of-selection.
* Begin start-of-selection.
Message i888 (sabapdocu) with 'start-of-selection '.
Select * From sflight.
Move sflight-carrid to t_report-carrid.
Move sflight-connid to t_report-connid.
Append t_report.
Endselect.
* End start-of-selection.

End-of-selection.
* Begin end-of-selection.
Message i888 (sabapdocu) with 'end-of-selection '.
Format color col_normal.
Do 30 times.
Loop at t_report.
Write/t_report-carrid.
Write t_report-connid.
Endloop.
Enddo.
* End-of-selection.

Top-of-page.
Format color col_heading.
Write 'this is header '.

End-of-page.
Format color col_total.
Write 'this is footer '.

At line-selection.
Write:/'cursor row: ', Sy-curow.
Write:/'cursor Col: ', Sy-cucol.

 

Original http://abap-gallery.blogspot.com/2007/08/event-in-abap-report.html