What Are The Events in ALV

Events in alv and their FM    The main events in alv and their FM and why we use these: 
1. SLIS_PRINT_ALV. 
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
      print_end_of_list
    Define output text to be printed at the end of the entire list
      print_top_of_list
    Define output text to be printed at the beginning of the entire list
      print_end_of_page
    Define output text to be printed at the end of each page
      print_top_of_page
    Define output text to be printed at the beginning of each page
      subtotal_text
    Define self-defined subtotals texts

Mouse-controlled Actions in the Grid Control Event 
    Application
      button_click
    Query a click on a pushbutton in the ALV Grid Control
      double_click
    Query a double-click on a cell of the ALV Grid control 
      hotspot_click
    Query a hotspot click on columns defined for this purpose in advance
      onDrag
    Collect information when elements of the ALV Grid Control are dragged 
      onDrop
    Process information when elements of the ALV Grid Control are dropped 
      onDropComplete
    Perform final actions after successful Drag&Drop 
      onDropGetFlavor
    Distinguish between options for Drag&Drop behavior
Processing of Self-defined and Standard Functions Event
    Application
      before_user_command
    Query self-defined and standard function codes
      user_command
    Query self-defined function codes
      after_user_command
    Query self-defined and standard function codes
Definition of Self-defined Functions Event
    Application
      toolbar
    Change, delete or add GUI elements in the toolbar
      menu_button
    Define menus for menu buttons in the toolbar
      context_menu_request
    Change context menu
      onf1
    Define self-defined F1 help

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'.