data_changed在可編輯字段的數據發生變化時才會觸發。可用來檢查輸入數據的正確性。
代码语言：javascript复制REPORT z_tfalv_data_changed.
TYPE-POOLS: slis.
DATA: gs_fieldcat TYPE slis_fieldcat_alv,
gt_fieldcat TYPE slis_t_fieldcat_alv.
DATA: gs_layout TYPE slis_layout_alv.
DATA: gt_events TYPE slis_t_event,
gs_event TYPE slis_alv_event.
DATA: gt_itab LIKE TABLE OF spfli WITH HEADER LINE.
DEFINE macro_fieldcat.
CLEAR: gs_fieldcat.
gs_fieldcat-col_pos = &1.
gs_fieldcat-fieldname = &2.
gs_fieldcat-seltext_m = &3.
gs_fieldcat-edit = &4.
APPEND gs_fieldcat TO gt_fieldcat.
END-OF-DEFINITION.
macro_fieldcat '2' 'CARRID' 'CARRID' 'X'.
macro_fieldcat '3' 'CONNID' 'CONNID' 'X'.
macro_fieldcat '4' 'COUNTRYFR' 'COUNTRYFR' 'X'.
macro_fieldcat '5' 'CITYFROM' 'CITYFROM' 'X'.
macro_fieldcat '6' 'AIRPFROM' 'AIRPFROM' 'X'.
macro_fieldcat '7' 'COUNTRYTO' 'COUNTRYTO' 'X'.
macro_fieldcat '8' 'CITYTO' 'CITYTO' 'X'.
macro_fieldcat '9' 'AIRPTO' 'AIRPTO' 'X'.
macro_fieldcat '10' 'FLTIME' 'FLTIME' 'X'.
macro_fieldcat '11' 'DEPTIME' 'DEPTIME' 'X'.
macro_fieldcat '12' 'ARRTIME' 'ARRTIME' 'X'.
macro_fieldcat '13' 'DISTANCE' 'DISTANCE' 'X'.
MOVE 'DATA_CHANGED' TO gs_event-name.
MOVE 'HANDLE_DATA_CHANGED' TO gs_event-form.
APPEND gs_event TO gt_events.
gs_layout-edit = 'X'.
*START-OF-SELECTION.
SELECT * FROM spfli
INTO CORRESPONDING FIELDS OF TABLE gt_itab.
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
i_callback_program = sy-repid
it_fieldcat = gt_fieldcat
is_layout = gs_layout
it_events = gt_events
TABLES
t_outtab = gt_itab
EXCEPTIONS
program_error = 1
OTHERS = 2.
IF sy-subrc <> 0.
* Implement suitable error handling here
ENDIF.
FORM HANDLE_DATA_CHANGED USING
pcl_data TYPE REF TO
cl_alv_changed_data_protocol.
data: mod_data TYPE lvc_t_modi,
wa_mod_data TYPE lvc_s_modi.
data: count type n.
mod_data = pcl_data->mt_mod_cells.
LOOP AT mod_data INTO wa_mod_data WHERE fieldname = 'CONNID'.
IF strlen( wa_mod_data-value ) > 4.
call METHOD pcl_data->add_protocol_entry
EXPORTING
i_msgid = '00'
i_msgty = 'E'
i_msgno = '001'
i_msgv1 = 'length is too123 long'
i_fieldname = wa_mod_data-fieldname.
ENDIF.
ENDLOOP.
ENDFORM.
