What is blocked alv

Question

can any one explain me what is a blocked alv
Message was edited by:
        ameen shaik

Answer 1

hi
This report is used if you have to display more than one report on the output. Technically speaking if you have multiple internal table with data to be displayed as separate blocks then we go for block report of ALV
This looks like a simple report but this report has the features of sorting
and filtering only. 
The important functions used for creating this report are:
     A. REUSE_ALV_BLOCK_LIST_INIT
     B. REUSE_ALV_BLOCK_LIST_APPEND
     C. REUSE_ALV_BLOCK_LIST_DISPLAY
check with this report
Declarations for BLOCK ALV DISPLAY
*--type pools
TYPE-POOLS:slis.
DATA:x_layout TYPE slis_layout_alv,
t_field TYPE slis_t_fieldcat_alv,
*--field catalog
x_fldcat LIKE LINE OF t_field,
*--to hold all the events
t_events TYPE slis_t_event,
x_events TYPE slis_alv_event,
t_sort TYPE slis_t_sortinfo_alv,
x_sort LIKE LINE OF t_sort ,
*--Print Layout
x_print_layout TYPE slis_print_alv.
*----Macro to add field catalog.
*field "text "length "tech "COL_POS "DATATYPE "DDIC_OUTPUTLEN
DEFINE add_catalog.
clear x_fldcat.
x_fldcat-fieldname = &1.
x_fldcat-seltext_m = &2.
x_fldcat-outputlen = &3.
x_fldcat-tech = &4.
x_fldcat-col_pos = &5.
x_fldcat-no_zero = 'X'.
x_fldcat-ddictxt = 'M'.
x_fldcat-datatype = &6.
x_fldcat-ddic_outputlen = &7.
if &6 = 'N'.
x_fldcat-lzero = 'X'.
endif.
*--build field catalog
append x_fldcat to t_field.
END-OF-DEFINITION.
*----- data declerations.
data: v_repid like sy-repid.
data: begin of itab occurs 0,
matnr like mara-matnr,
ernam like mara-ernam,
meins like mara-meins,
end of itab.
data: begin of jtab occurs 0,
matnr like makt-matnr,
maktx like makt-maktx,
end of jtab.
select matnr ernam meins
up to 20 rows
from mara
into table itab.
select matnr maktx
up to 20 rows
from makt
into table jtab.
v_repid = sy-repid.
*DISPLAY alv
Initialize Block
call function 'REUSE_ALV_BLOCK_LIST_INIT'
exporting
i_callback_program = v_repid.
*Block 1:
*INITIALIZE
refresh t_field. clear t_field.
refresh t_events.
*field "text "length "tech "COL_POS "DATATYPE "DDIC_OUTPUTLEN
add_catalog:
'MATNR' 'Material' '18' '' '1' 'C' '18',
'ERNAM' 'Created By' '12' '' '2' 'C' '12',
'MEINS' 'Unit' '5' '' '3' 'C' '3'.
*--build table for events.
x_events-form = 'TOP_OF_LIST1'.
x_events-name = slis_ev_top_of_list.
append x_events to t_events.
call function 'REUSE_ALV_BLOCK_LIST_APPEND'
exporting
is_layout = x_layout
it_fieldcat = t_field
i_tabname = 'ITAB'
it_events = t_events
it_sort = t_sort
tables
t_outtab = itab
exceptions
program_error = 1
maximum_of_appends_reached = 2
others = 3.
if sy-subrc <> 0.
message id sy-msgid type sy-msgty number sy-msgno
with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
endif.
*--BLOCK 2(SUMMARY REPORT)
*INITIALIZE
refresh t_field. clear t_field.
refresh t_events.
*field "text "length "tech "COL_POS "DATATYPE "DDIC_OUTPUTLEN
add_catalog:
'MATNR' 'Material' '20' '' '1' 'C' '18',
'MAKTX' 'Description' '40' '' '2' 'C' '40'.
*--build table for events.
x_events-form = 'TOP_OF_LIST2'.
x_events-name = slis_ev_top_of_list.
append x_events to t_events.
Append table block.
call function 'REUSE_ALV_BLOCK_LIST_APPEND'
exporting
is_layout = x_layout
it_fieldcat = t_field
i_tabname = 'JTAB'
it_events = t_events
tables
t_outtab = jtab
exceptions
program_error = 1
maximum_of_appends_reached = 2
others = 3.
if sy-subrc <> 0.
message id sy-msgid type sy-msgty number sy-msgno
with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
endif.
*--CALL FM TO DISPLAY THE BLOCK REPORT.
call function 'REUSE_ALV_BLOCK_LIST_DISPLAY'
exporting
is_print = x_print_layout
exceptions
program_error = 1
others = 2.
if sy-subrc <> 0.
message id sy-msgid type sy-msgty number sy-msgno
with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
endif.
form top_of_list1.
skip 1.
write: 10 'List 1',
/5 '----
skip 1.
format reset.
endform.
form top_of_list2.
skip 1.
write: 10 'List 2',
/5 '----
skip 1.
format reset.
endform.
and this link
https://www.sdn.sap.com/irj/sdn/wiki?path=/display/snippets/abap-ProgramforALVBlocklist&
Hope this helps to solve ur problem....
do reward if useful....
regards
dinesh