ABAP事件分类

1、报表事件

INITIALIZATION.

START-OF-SELECTION.

END-OF-SELECTION.

2、选择屏幕事件

在INITIALIZATION和START-OF-SELECTION之间触发，对应于对话屏幕的 PBO、PAI、POH、POV事件 

 AT SELECTION-SCREEN { OUTPUT }
                    | { ON {para|selcrit} }
                    | { ON END OF selcrit }
                    | { ON BLOCK block }
                    | { ON RADIOBUTTON GROUP radi }
                    | { oN {HELP-REQUEST|ALUE-REQUEST}
                                             { FOR {para|selcrit-low|selcrit-high} }
                    | { ON EXIT-COMMAND }
                        | { }.

3、选择屏幕事件

GET node [LATE] [FIELDS f1 f2 ...].

4、列表事件

TOP-OF-PAGE.
END-OF-PAGE.
AT LINE-SELECTION.
AT USER-COMMAND.
AT pf<nn>.