Which event will trigger first?

hi, any one can explain me the execution of at selection screen events in order.
which event will trigger first at selection-screen output or at selection-screen?

Hi,
The Selection screen sequence is-
1) AT SELECTION-SCREEN OUTPUT
2) AT SELECTION-SCREEN ON VALUE REQUEST FOR <FIELD>
3) AT SELECTION-SCREEN ON HELP REQUEST FOR <FIELD>
4) AT SELECTION-SCREEN ON <SEL_OPT>
5) AT SELECTION-SCREEN ON <PARAMETER>
6) AT SELECTION-SCREEN ON BLOCK <B1>
7) AT SELECTION-SCREEN ON RADIOBUTTON GROUP1<RAD1>
8) AT SELECTION-SCREEN
9) AT SELECTION-SCREEN ON VALUE REQUEST FOR <SEL_OPT_LOW>
10) AT SELECTION-SCREEN ON HELP REQUEST FOR <SEL_OPT_LOW>
11) AT SELECTION-SCREEN ON END OF SEL_OPT
***DO REWARD IF USEFULL
REGARDS,
VIJAY

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Q(2). Interactive reports.
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Q(3). ALV List and Grid
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Hi,
Events in alv and their FM    The main events in alv and their FM and why we use these:
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2. SLIS_T_LISTHEADER.
3. SLIS_T_EVENT.
4. SLIS_T_SORTINFO_ALV.
5. SLIS_T_LAYOUT_ALV.
6. SLIS_T_FIELDCAT_ALV.
and in classic reports what is the sequence of events:   === Events are
At selection-screen output.
Initialization.
At selection-screen on field
At selection-screen on end of field
At selection-screen on Radiobutton Group R1. (If you have any radio buttons)
At selection-screen on block b1. (If you have any blocks)
Start-of-selection.
Get node. (if the data is retreived from a logical database)
Get node late. (if the data is retreived from a logical database)
Top-of-page. (if the write statement is in the end-of-selection event or we can say that before the first write statement)
end-of-selection.
and fuction modules are
LISTHEADER - Is used to print the header information in the ALV List. Name, Date, Time, ALV Name and other details are called as Header information.   EVENT - Basically this is the FM to handle Event's. When the user needs to do some event operation like when double clicking the a particular field we need to perform some operation.   These events are captured by this FM.   LAYOUT - This FM is used to define the layout of the List. There are many options available in this FM to define the Layout style.   FIELDCAT - These are used to populate the List header. We can change them according to our req.
User-defined Text Output Event
    Application
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Mouse-controlled Actions in the Grid Control Event
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      onDrop
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Processing of Self-defined and Standard Functions Event
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      user_command
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      after_user_command
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Definition of Self-defined Functions Event
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      context_menu_request
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All of these can be found under type group SLIS.
Events
SLIS_EV_ITEM_DATA_EXPAND        TYPE SLIS_FORMNAME VALUE 'ITEM_DATA_EXPAND',
SLIS_EV_REPREP_SEL_MODIFY       TYPE SLIS_FORMNAME VALUE 'REPREP_SEL_MODIFY', SLIS_EV_CALLER_EXIT_AT_START TYPE SLIS_FORMNAME VALUE 'CALLER_EXIT',
SLIS_EV_USER_COMMAND              TYPE SLIS_FORMNAME VALUE 'USER_COMMAND',
SLIS_EV_TOP_OF_PAGE                     TYPE SLIS_FORMNAME VALUE 'TOP_OF_PAGE',
SLIS_EV_DATA_CHANGED                TYPE SLIS_FORMNAME VALUE 'DATA_CHANGED',
SLIS_EV_TOP_OF_COVERPAGE       TYPE SLIS_FORMNAME VALUE 'TOP_OF_COVERPAGE',
SLIS_EV_END_OF_COVERPAGE       TYPE SLIS_FORMNAME VALUE 'END_OF_COVERPAGE',
SLIS_EV_FOREIGN_TOP_OF_PAGE TYPE SLIS_FORMNAME
VALUE 'FOREIGN_TOP_OF_PAGE', SLIS_EV_FOREIGN_END_OF_PAGE TYPE SLIS_FORMNAME
VALUE 'FOREIGN_END_OF_PAGE',
SLIS_EV_PF_STATUS_SET                  TYPE SLIS_FORMNAME VALUE 'PF_STATUS_SET',
SLIS_EV_LIST_MODIFY                      TYPE SLIS_FORMNAME VALUE 'LIST_MODIFY',
SLIS_EV_TOP_OF_LIST                       TYPE SLIS_FORMNAME VALUE 'TOP_OF_LIST',
SLIS_EV_END_OF_PAGE                    TYPE SLIS_FORMNAME VALUE 'END_OF_PAGE',
SLIS_EV_END_OF_LIST                      TYPE SLIS_FORMNAME VALUE 'END_OF_LIST',
SLIS_EV_AFTER_LINE_OUTPUT       TYPE SLIS_FORMNAME VALUE 'AFTER_LINE_OUTPUT', SLIS_EV_BEFORE_LINE_OUTPUT     TYPE SLIS_FORMNAME VALUE 'BEFORE_LINE_OUTPUT',
SLIS_EV_SUBTOTAL_TEXT                TYPE SLIS_FORMNAME VALUE 'SUBTOTAL_TEXT'.
Reward pts if usefull.
Regards,
Dhan

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