Creating ALV Grid Control using Call FM and OO Approach in ABAP

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Creating ALV Grid Control using FM and OO Approach in ABAP

If you are looking for a article on how to create ALV grid control, this tutorial will help you in creating ALV gird control by using two methods calling functional module and object oriented approach.

Approaches to create ALV Grid Control

1) Call Function Module

2) Using Object Oriented approach

Now lets discuss about these two different approaches in detail.

1) Call Function Module Approach

In this approach, we normally call a appropriate function module and we pass some parameters to that particular function module, according to the supplied parameters the function module will do some manipulation and its done.


The mostly used function modules in creating ALV grid control are: 

REUSE_ALV_LIST_DISPLAY,

EUSE_ALV_GRID_DISPLAY,

REUSE_ALV_GRID_DISPLAY_LVC.

Example Program Using Call Function Module Approach to Create ALV Grid

DATA: LAYOUT TYPE SLIS_LAYOUT_ALV,

        FCAT TYPE SLIS_T_FIELDCATA_ALV,

        W_FCAT TYPE SLIT_FIELDCATA_ALV.

CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'

  EXPORTING

      IS_LAYOUT    = LAYOUT

      IT_FIELDCAT   = FCAT

  TABLES

     T_OUTTAB      = YOUR TABLE.

2) Using Object Oriented Approach to Create ALV Grid

Object Oriented method (OO Approach) is the most flexible way to create ALV gird and its entirely different from call function module method. First we need to create objects for classes,

instance of CL_GUI_ALV_GRID

instance of CL_GUI_CUSTOM_CONTAINER

Now  we need to create screen to hold the container, later we should call a method

SET_TABLE_FOR_FIRST_DISPLAY.

There are some differences between these two approaches.

The parameter types are different for function module  

REUSE_ALV_LIST_DISPLAY,

REUSE_ALV_GRID_DISPLAY.

The parameter IS_LAYOUT is of type SLIS_LAYOUT_ALV,
and the parameter IT_FIELDCAT is of type SLIS_T_FIELDCATA_ALV

But when you using the Object Oriented approach, the two parameter are of type

LVC_S_LAYO
and
LVC_T_FCAT 

however, when you call function module  

REUSE_ALV_GRID_DISPLAY_LVC, 

the two parameters are the same as the OO approach. 

Sample Program using OO Approach to Create ALV Gird 

DATA: GRID TYPE REF TO CL_GUI_ALV_GRID,
      CONTAINER TYPE REF TO CL_GUI_CUSTOM_CONTAINER,
      LAYOUT TYPE LVC_S_LAYO,
      FCAT TYPE LVC_T_FCAT,
      W_FCAT TYPE LVC_S_FCAT.
IF  CONTAINER IS INITIAL.
  CREATE OBJECT  CONTAINER
  EXPORTING CONTAINER_NAME = 'mycont'.
  CREATE OBJECT GRID
  EXPORTING I_PARENT = PARENT_GRID.
  CALL METHOD GRID->SET_TABLE_FOR_FIRST_DISPLAY
  EXPORTING
    IS_LAYOUT = LAYOUT
  CHANGING
    IT_FIELDCATALOG = FCAT
    IT_OUTTAB = YOUR IT.

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