ALV report in SAP tutorial - ABAP list viewer -012

SAP In the tutorial ALV The report - ABAP List viewer -012

A common required feature of any report is “ Column alignment ”, Sort , Filter , Subtotal , Total, etc . To do this from scratch , A lot of coding work is required . To avoid that , We can use one called ABAP List viewer （ALV） The concept of .

In this tutorial , You will learn ：

• Simple report
• Block report
• Tiered reporting
• Show variations

Each of these reports provides Function module , These modules help to easily generate the required output . Let's take a closer look at them -

Simple report

The important functional modules in these reports are –

• Reuse_alv_fieldcatalog_merge
• Reuse_alv_list_display
• Reuse_alv_events_get
• Reuse_alv_grid_display
• Reuse_alv_commentary_write

REUSE_ALV_FIELDCATALOG_MERGE
This function module is used to populate the field directory , This is true of ALV It is important to display data in .
If the output data comes from a single dictionary table , And all columns are selected , Then we do not need to create the field directory exclusively . stay REUSE_ALV_LIST_DISPLAY Take the table name as a parameter （I_structure_name） Mention is enough . But in other cases , We need to create it .

Be careful ： Field directories can also be manually populated by populating the internal table with all the required details

The important parameters in ：

1. exit ：

• I_program_name： The report ID
• I_internal_tabname： Internal output table
• I_inclname： contain Or the name of the report that processes all dynamic forms .

2. change

• ct_fieldcat ： The type is SLIS_T_FIELDCAT_ALV The internal table of , In type pool SLIS In a statement .

REUSE_ALV_LIST_DISPLAY
This is the function module for printing data .
Important parameters are ：

1. exit ：

• I_callback_program： The report ID
• I_bypassing_buffer ： ‘X’
• I_buffer_active ： ’ ’
• I_callback_pf_status_set ： routine , Users can set their own pf Status or change existing pf Function of state .
• I_callback_user_command： Routines that handle function code .
• I_structure name ： The name of the dictionary table
• Is_Layout： Set the structure of the report layout
• It_fieldcat： Internal tables , It contains a list of all fields to be printed and their attributes （ This table can be automatically populated by functions ）
• It_events ： Internal table , It includes ALV A list of all possible events and their corresponding form names .

2. form ：

• a. t_outtab： Internal table containing the data to be output

REUSE_ALV_EVENTS_GET：
Returns a table of possible events of list type

1. Import ：

Et_Events ： The event table will return the specified list type （ Column “NAME”） All possible callback events for . For the event to be handled by the callback , Its... Must be filled in “FORM” Field . If the field is initialized , Then ignore the event . This entry can be read from the event table , Fill in fields “FORM”, And use the type pool SLIS The constants in modify the entry .

2. exit ：

I_list_type：0 = Simple list REUSE_ALV_LIST_DISPLAY
1 = Hierarchical order list REUSE_ALV_HIERSEQ_LIST_DISPLAY
2 = Simple block list REUSE_ALV_BLOCK_LIST_APPEND
3 = Hierarchical order block list REUSE_ALV_BLOCK_LIST_HS_APPEND

REUSE_ALV_GRID_DISPLAY
ABAP4.6 New features in version , Used to display results in a grid , Instead of previewing .
Parameters ： And reuse_alv_list_display identical

Be careful ： The grid cannot handle high volumes . Sorting and other functions , If the amount of data to be displayed is very high , Scrolling down consumes a lot of resources / Time . There is no clear definition , If the amount of data is X, Then select a list or grid , But the developer must call it based on his experience . If not sure , Then the list is a better choice

REUSE_ALV_COMMENTARY_WRITE
This is in “ The first page ” Event to print the title and other comments of the list .
Important parameter

• It_list_commentary ： The title is slis_t_listheader Internal table for .
  This internal table has three fields ：

1. type ： ‘H’ – title , ‘S’ – choice , ‘A’ – action
2. key ： Only if the typical value is “S” when .
3. Information ： Text to print

Block report

This looks like a simple report , But this report only has sorting and filtering functions . If you have to display multiple reports on the output , Use this report . Technically speaking , If you have multiple internal tables , The data is displayed as separate blocks , Then we will choose ALV Block report for .

Important functions for creating this report include ：

• REUSE_ALV_BLOCK_LIST_INIT
• REUSE_ALV_BLOCK_LIST_APPEND
• REUSE_ALV_BLOCK_LIST_DISPLAY

REUSE_ALV_BLOCK_LIST_INIT
This function module is used to set the default GUI State, etc . These parameters are similar to reuse_alv_list_display or reuse_alv_grid_display

REUSE_ALV_BLOCK_LIST_APPEND
This function module adds data to the block .
Important parameter
1. exit ：

• is_layout： Block layout settings
• it_fieldcat： Field Directory
• I_tabname： Internal table name containing all possible events
  2. form ：
• t_outtab： Internal table containing output data .

REUSE_ALV_BLOCK_LIST_DISPLAY
This function module displays a list containing the data attached to the above function .
Parameters ： All parameters are optional .

Tiered reporting

Hierarchical display is used to display relevant data . Such as sales order and material details . here , Sales order details can be header data , The items in the sales order can be item data
The function modules used for this purpose are

REUSE_ALV_HIERSEQ_LIST_DISPLAY
exit ：

• I_CALLBACK_PROGRAM
• I_CALLBACK_PF_STATUS_SET
• I_CALLBACK_USER_COMMAND
• IS_LAYOUT
• It_fieldcat
• It_events
• I_tabname_header ： The name of the internal table in the program that contains the highest hierarchy level output data .
• I_tabname_item ： The name of the internal table in the program that contains the output data at the lowest hierarchy level .
• Is_keyinfo： This structure contains links between two tables （ Share key ） Title and item table field name .

surface

• t_outtab_header： Picture table to output data
• t_outtab_item ： The name of the internal table in the program that contains the output data at the lowest hierarchy level .

Internal table 、 All definitions of structures and constants are in the name SLIS Declared in the type pool of . have access to REUSE_ALV_FIELDCATALOG_MERGE Auto populate this internal table .

Show variations

• Show variations for setting alv Default properties for output , Such as sorting conditions 、 Filter conditions 、 Total and subtotal, etc
• Display variations can be user specific and standard （ Standard variants can be used by any user ）
• The display variant type that can be saved is determined by the parameters passed in the function module i_save control reuse_alv_list_display/ reuse_alv_grid_display
• You can provide an option on the selection screen , To select the display variant to use

And selection / Verify that the common functional modules related to display variants are

1. Reuse_alv_variant_default_get
2. Reuse_alv_variant_f4
3. Reuse_alv_variant_existence

This is it. ABAP-ALV The whole content of programming ！
Reference resources :https://www.guru99.com/alv-list-view-programming.html