本文介绍如何在SALV中添加页眉(Top of page)和页脚(End of page)。
页眉和页脚可以通过类cl_salv_form_layout_grid ，cl_salv_form_label，cl_salv_form_layout_flow创建，具体方法如下：
1，创建cl_salv_form_layout_grid ，cl_salv_form_label，cl_salv_form_layout_flow 的类引用
2，用到的方法
create_label ：指定label的位置，行和列
create_flow ：指定flow的位置，行和列
set_text ：设定label中的文本
create_text ：设定flow中的文本
set_end_of_list ：显示页脚设置
set_end_of_list_print ：打印页脚设置
set_top_of_list ：显示页眉设置
set_top_of_list_print ：打印页眉设置
在SALV教程1-创建简单SALV中的代码基础上添加两个方法set_top_of_page， set_end_of_page
UML图如下：
完整代码如下：
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*&---------------------------------------------------------------------*
*& 一个简单的通过类CL_SALV_TABLE生成SALV的例子
*&---------------------------------------------------------------------*
REPORT z_salv_3.
*
*----------------------------------------------------------------------*
* CLASS lcl_report DEFINITION
*----------------------------------------------------------------------*
CLASS lcl_report DEFINITION.
*
PUBLIC SECTION.
*
* 定义SALV输出内表
TYPES: BEGIN OF ty_vbak,
vbeln TYPE vbak-vbeln,
erdat TYPE erdat,
auart TYPE auart,
kunnr TYPE kunnr,
END OF ty_vbak.
*
DATA: t_vbak TYPE STANDARD TABLE OF ty_vbak.
*
* ALV reference
DATA: o_alv TYPE REF TO cl_salv_table.
*
METHODS:
* 抽取数据
get_data,
*
* 生成输出内容
generate_output.
*
*$*$*.....CODE_ADD_1 - Begin..................................1..*$*$*
*
* 定义private method来设定SALV不同特性
PRIVATE SECTION.
METHODS:
set_pf_status CHANGING co_alv TYPE REF TO cl_salv_table.
* 设置 Top of page
METHODS:
set_top_of_page CHANGING co_alv TYPE REF TO cl_salv_table.
*
* 设置 End of page
METHODS:
set_end_of_page CHANGING co_alv TYPE REF TO cl_salv_table.
*$*$*.....CODE_ADD_1 - End....................................1..*$*$*
ENDCLASS. "lcl_report DEFINITION
*----------------------------------------------------------------------*
* CLASS lcl_report IMPLEMENTATION
*----------------------------------------------------------------------*
* 类实现
CLASS lcl_report IMPLEMENTATION.
*
METHOD get_data.
* 抽取数据
SELECT vbeln
erdat
auart
kunnr
INTO TABLE t_vbak
FROM vbak
UP TO 20 ROWS.
*
ENDMETHOD. "get_data
*.......................................................................
METHOD generate_output.
* New ALV instance
* We are calling the static Factory method which will give back
* the ALV object reference.
*
* exception class
DATA: lx_msg TYPE REF TO cx_salv_msg.
TRY.
cl_salv_table=>factory(
IMPORTING
r_salv_table = o_alv
CHANGING
t_table = t_vbak ).
CATCH cx_salv_msg INTO lx_msg.
ENDTRY.
*
*$*$*.....CODE_ADD_2 - Begin..................................2..*$*$*
*
* In this area we will call the methods which will set the
* different properties to the ALV
* 调用status设置方法
CALL METHOD set_pf_status
CHANGING
co_alv = o_alv.
* 调用 top of page 方法
CALL METHOD me->set_top_of_page
CHANGING
co_alv = o_alv.
*
* 调用 End of Page 方法
CALL METHOD me->set_end_of_page
CHANGING
co_alv = o_alv.
*$*$*.....CODE_ADD_2 - End....................................2..*$*$*
*
*
* 调用Display方法将数据输出到屏幕上
o_alv->display( ).
*
ENDMETHOD. "generate_output
*
*$*$*.....CODE_ADD_3 - Begin..................................3..*$*$*
*
* In this area we will implement the methods which are defined in
* the class definition
* status设置方法实现
METHOD set_pf_status.
DATA: lo_functions TYPE REF TO cl_salv_functions_list.
* 设置默认的标准状态栏
lo_functions = co_alv->get_functions( ).
lo_functions->set_default( abap_true ).
ENDMETHOD.
METHOD set_top_of_page.
*
DATA: lo_header TYPE REF TO cl_salv_form_layout_grid,
lo_h_label TYPE REF TO cl_salv_form_label,
lo_h_flow TYPE REF TO cl_salv_form_layout_flow.
*
* header object
CREATE OBJECT lo_header.
*
* 通过Row 和 column字段定位在top of page的文本输出位置
*
* 粗体
lo_h_label = lo_header->create_label( row = 1 column = 1 ).
lo_h_label->set_text( 'Header in Bold' ).
*
* information in tabular format
lo_h_flow = lo_header->create_flow( row = 2 column = 1 ).
lo_h_flow->create_text( text = 'This is text of flow' ).
*
lo_h_flow = lo_header->create_flow( row = 3 column = 1 ).
lo_h_flow->create_text( text = 'Number of Records in the output' ).
*
lo_h_flow = lo_header->create_flow( row = 3 column = 2 ).
lo_h_flow->create_text( text = '20' ).
*
* 页眉显示
co_alv->set_top_of_list( lo_header ).
*
* 页眉打印
co_alv->set_top_of_list_print( lo_header ).
ENDMETHOD. "set_top_of_page
*
METHOD set_end_of_page.
*
DATA: lo_footer TYPE REF TO cl_salv_form_layout_grid,
lo_f_label TYPE REF TO cl_salv_form_label,
lo_f_flow TYPE REF TO cl_salv_form_layout_flow.
* 通过Row 和 column字段定位在end of page的文本输出位置
* footer object
CREATE OBJECT lo_footer.
*
* 粗体
lo_f_label = lo_footer->create_label( row = 1 column = 1 ).
lo_f_label->set_text( 'Footer .. here it goes' ).
*
* tabular information
lo_f_flow = lo_footer->create_flow( row = 2 column = 1 ).
lo_f_flow->create_text( text = 'This is text of flow in footer' ).
*
lo_f_flow = lo_footer->create_flow( row = 3 column = 1 ).
lo_f_flow->create_text( text = 'Footer number' ).
*
lo_f_flow = lo_footer->create_flow( row = 3 column = 2 ).
lo_f_flow->create_text( text = 1 ).
*
* 页脚显示
co_alv->set_end_of_list( lo_footer ).
*
* 页脚打印
co_alv->set_end_of_list_print( lo_footer ).
*
ENDMETHOD. "set_end_of_page
*$*$*.....CODE_ADD_3 - End....................................3..*$*$*
*
ENDCLASS. "lcl_report IMPLEMENTATION
START-OF-SELECTION.
DATA: lo_report TYPE REF TO lcl_report.
CREATE OBJECT lo_report.
* 抽取数据
lo_report->get_data( ).
* 生成SALV
lo_report->generate_output( ).
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运行结果如下：
以上。