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ALV Field Catalog in SAP ABAP

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ALV Field Catalog in SAP ABAP


Field Catalog

Field catalog is an internal table which is used to pass a list of fields to display in ALV report, we can set different properties to fields that will be display in ALV output.

Type Group

It is a data dictionary object which contains all the reusable user-defined types.

Example for a type group is SLIS, which contains all the user-defined types for developing ALV reports.
TYPE-POOLS is a keyword which is used to assign the type-group to a ALV report .

Syntax : 
TYPE-POOLS SLIS . 
DATA : <IT_FCAT> TYPE SLIS_T_FIELDCAT_ALV . "INTERNAL TABLE FOR FIELD CATALOG
DATA : <WA_FCAT> TYPE SLIS_FIELDCAT_ALV  . " WORK AREA FOR FIELD CATLOG

Field catalog types


Field catalog:
Field catalog is a format description of the display area.
There are three procedures to build a FIELD CATALOG.
1. Automatic field catalog.
2. Semi-automatic field catalog.
3. Manual field catalog.

Automatic field catalog.

If the list structure has the same line type as the dictionary structure, then the proxy instance
will automatically create the field catalog.
To do this, just pass the name of the dictionary structure to form using the parameter
'I_STRUCTURE_NAME'.

Semi-automatic field catalog.

All fields of the global structure type appears in the data table with the same name.
Now the requirement is to make changes to the dictionary structure or the additional columns
are to be displayed.
In this case we can call a function module (LVC_FIELDCATALOG_MERGE) that returns the field catalog
of the dictionary structure to a table of type lvc_t_fcat.
Now we can loop it and can make whatever changes we want.

Manual field catalog.

If the data table's line type does not contains the dictionary references or it only contains references to individual
global structure fields, you have to create the field catalog manually.
For this you have to create an internal table of type LVC_T_FACT and populate it manually.

SLIS_T_FIELDCAT_ALV.
SLIS_FIELDCAT_ALV.


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