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创建选择屏幕的详细介绍

原创 Linux操作系统 作者:chouer523 时间:2019-07-19 10:21:02 0 删除 编辑
简单的屏幕编程,详细的说明,初始化,屏幕事件等

16.选择屏幕
读者从ABAP开发帮助文档能了解选择屏幕的使用,有本英文教材是<<21天学会ABAP>>,同样本书的
目的是让有一定程序基础的读者在三个月内成为ABAP顾问,故本书重点将放在实际业务分析上,因
此在此只是汇总下选择屏幕的使用.
下面是一个典型的选择屏幕的典型例子.
1.设置选择屏幕参数.
***begin(end) of block使用屏幕元素逻辑块.
SELECTION-SCREEN BEGIN OF BLOCK BK1 WITH FRAME TITLE TITLE1.
***定义选择标准,比如那些屏幕子段使用范围,设置为必选或使用内存ID等.
SELECT-OPTIONS FOR DEFAULT│NO INTERVALS│OBLIGATORY│NO-DISPLAY│MEMORY
ID...
***要在选择屏幕上书写文本使用屏幕注释并在屏幕初始化时赋值.
SELECTION-SCREEN COMMENT ...
***在屏幕上画线.
SELECTION-SCREEN ULINE ...
***Begind(end)of line包含的屏幕参数将在同一条直线上.
SELECTION-SCREEN BEGIN OF LINE...
SELECTION-SCREEN END OF LINE...
***设置屏幕位置.
SELECTION-SCREEN POSITION...
***在应用工具条上创建按钮响应事件
SELECTION-SCREEN FUNCTION KEY...
***在屏幕上创建按钮.
SELECTION SCREEN PUSHBUTTON ...
SELECTION-SCREEN END OF BLOCK BK1.

INITIALIZATION.
***初始化屏幕参数,类似VB的Form_load事件***

AT SELECTION-SCREEN .
***系统选择屏幕时的过程处理,比如需要判断一些屏幕字段的条件限制如为某些值则***显示
error message,程序没有必要浪费时间继续执行下去.
***on help-request 可为屏幕字段显示自定义帮助
***on value-request可显示建议列表值
***可这样理解AT selection-screen相当于 PBO.
***PERFORM sub_validate_FieldXXX .
***选屏后按Enter或F8运行时都会执行.
START-OF-SELECTION .
***设置内表值,处理没有附加关键字的所有语句.
***通常包含在此的Form是在按F8后才开始执行.
END-OF_SELECTION .

AT USER-COMMAND.
***处理用户请求事件,如报表使用ALV格式,通常在call function exporting
*** I_CALLBACK_USER_COMMAND = 'USER_COMMAND'
***再建立一个子程序form USER_COMMAND USING UCOMM LIKE SY-UCOMM

AT LINE-SELECTION.
***通常此事件在报表显示后用户在列表中在选择行时触发.如报表使用的是write
***就可使用此事件.
*** SET PARAMETER ID 'XXX' FIELD XXX.
*** call transACtion 'XXX' AND SKIP FIRST SCREEN.

TOP-OF-PAGE.
*** 显示数据,使用TOP-OF-PAGE是在分页时可将定义的页头页尾在每页显示.
*** PERFORM write_page_header(page header在每页都显示).
*** PERFORM DISPLAY_ALV_DATA.
END-OF-PAGE.
下面一个简单的会计凭证显示的实例说明选择屏幕的使用.
***这程序只是做演示用,但是包含了常用的选择屏幕技术.
将下面的程序copy就可跑.

REPORT ZSELECTION NO STANDARD PAGE HEADING
MESSAGE-ID zFIMSG "MEssage Class
LINE-SIZE 255
LINE-COUNT 32(3).

tables :BKPF,BSEG,S070.
DATA:ZBKPF like bkpf occurs 0 ,
zwa_bkpf like bkpf.
CONSTANTS:P_variant(2) TYPE c VALUE 'WL'.
***下面这些屏幕参数和事件没有关系,只是参数集而已.
SELECTION-SCREEN BEGIN OF BLOCK bk1 WITH FRAME TITLE Cond1.
SELECT-OPTIONS S_bukrs FOR bkpf-bukrs MEMORY ID BUK.
SELECT-OPTIONS S_blart FOR bkpf-blart NO INTERVALS .
SELECT-OPTIONS S_belnr FOR bkpf-belnr .
SELECT-OPTIONS S_budat FOR bkpf-budat DEFAULT sy-datum.
SELECT-OPTIONS S_bldat FOR bkpf-bldat NO INTERVALS NO-EXTENSION.
SELECT-OPTIONS S_gjahr FOR bkpf-gjahr MEMORY ID GJR DEFAULT sy-datum(4).
SELECT-OPTIONS weekran for s070-SPBUP NO-EXTENSION .
SELECTION-SCREEN END OF BLOCK bk1.

SELECTION-SCREEN BEGIN OF BLOCK bk2 WITH FRAME TITLE Cond2.
SELECTION-SCREEN COMMENT /1(30) COMM1 . "使用屏幕注释
SELECTION-SCREEN BEGIN OF LINE ."两单选框将在同一条线上.
PARAMETERS pnor RADIOBUTTON GROUP grp1 DEFAULT 'X'."Print normal doc
PARAMETERS ppark RADIOBUTTON GROUP grp1. "Print parked doc
SELECTION-SCREEN END OF LINE .
SELECTION-SCREEN END OF BLOCK bk2.

***1 初始化参数.
INITIALIZATION.
Cond1 = '【Condition】'.
Cond2 = '【Normal Doc│Parked Doc】'.
COMM1 = 'Choose Doc. Type:'. "注释赋初值.
***初始公司值,这在有些需要后台跑的程序非常有用,除了使用variant外,在此也可赋初
***下面的例子在初始化后公司代码选择了1000和3000排除了2000
S_bukrs-low = '1000'.
S_bukrs-sign = 'I'. "I->包含,E->排除
S_bukrs-option = 'EQ'. "NE
APPEND S_bukrs.
S_bukrs-low = '2000'.
S_bukrs-sign = 'E'.
S_bukrs-option = 'EQ'.
APPEND S_bukrs.
S_bukrs-low = '3000'.
S_bukrs-sign = 'E'.
S_bukrs-option = 'EQ'.
APPEND S_bukrs.
***初始化doc range 从0100000000到1000000000
s_belnr-low = '0100000000'.
s_belnr-high = '1000000000'.
s_belnr-sign = 'I' .
s_belnr-option = 'BT'.
append s_belnr.

***2 使用sug_get_week后得到所选日期的当前周数,在选择weekrag字段时才触发.
***当你选择weekran字段时.
AT SELECTION-SCREEN ON VALUE-REQUEST FOR weekran-low.
PERFORM sub_get_week CHANGING weekran-low.


AT SELECTION-SCREEN.
***判断所选择的公司代码是否有效,通常并不是必须的.
***当然你也可将此步省略,直接在START-OF-SELECTION判断.
***根据需要可做很多vaid字段的判断.
PERFORM SUB_VALIDATE_COMP.

***3开始选屏
START-OF-SELECTION.
Perform SUB_GET_DOC.
PERFORM SUB_WRT_DOC.
END-OF-SELECTION.

***4.分页时显示page header或page footer.
TOP-OF-PAGE.
perform sub_WRT_HEADER.
end-of-page.

***5.当点击行并且是点到Document NO.CAll FB03.
AT line-selection.
Perform sub_line_response.
form sub_line_response.
Data: ZFLDNAME like DD01L-DOMNAME,
ZFLDVALUE like TTREET-TEXT,
zwa_bkpf like bkpf.
GET CURSOR FIELD ZFLDNAME VALUE ZFLDVALUE .
if ZFLDNAME = 'ZWA_BKPF-BELNR' .
* READ TABLE Zbkpf into zwa_bkpf WITH KEY BELNR = ZFLDVALUE.
* SET PARAMETER ID 'BUK' FIELD zwa_bkpf-BUKRS.
* SET PARAMETER ID 'GJR' FIELD zwa_bkpf-GJAHR.
* SET PARAMETER ID 'BLN' FIELD zwa_bkpf-BELNR.
SET PARAMETER ID 'BLN' FIELD ZFLDVALUE .
CALL TRANSACTION 'FB03' AND SKIP FIRST SCREEN.
endif.
endform .

FORM SUB_GET_DOC.
refresh zbkpf .
SELECT * FROM bkpf into table Zbkpf
WHERE bukrs IN s_bukrs
AND belnr IN s_belnr
AND gjahr IN s_gjahr
AND budat IN s_budat.
endform.

form sub_wrt_header.
FORMAT INTENSIFIED COLOR = 6.
WRITE AT: /01 'Finaincial Document List:'(h07).
FORMAT COLOR COL_NORMAL ON.
FORMAT COLOR COL_HEADING ON.
WRITE AT:/01(48) sy-uline.
FORMAT COLOR COL_HEADING OFF.
FORMAT COLOR OFF.
endform.

form sub_wrt_doc.
uline /1(41).
loop at zbkpf into zwa_bkpf.
write:/ '│',zwa_bkpf-bukrs,'│',zwa_bkpf-belnr,'│',zwa_bkpf-gjahr,'│',zwa_bkpf-
budat,'│'.
uline /1(41).
endloop.
endform.

FORM SUB_VALIDATE_COMP.
data itab_bukrs like bkpf-bukrs occurs 0 .
select bukrs into table itab_bukrs
from T001
where BUKRS in S_bukrs .
if itab_bukrs IS INITIAL.
Message e002(00) .
endif.
endform.

FORM sub_get_week CHANGING wkran LIKE s070-SPBUP.
DATA: l_date LIKE workflds-gkday,
l_period LIKE t009b-poper,
l_year LIKE t009b-bdatj.
***根据选择日期得到当前周数
CALL FUNCTION 'F4_DATE'
EXPORTING
date_for_first_month = sy-datum
display = ''
IMPORTING
select_date = l_date
EXCEPTIONS
calendar_buffer_not_loadable = 1
date_after_range = 2
date_before_range = 3
date_invalid = 4
factory_calendar_not_found = 5
holiday_calendar_not_found = 6
parameter_conflict = 7
OTHERS = 8.
CALL FUNCTION 'G_PERIOD_GET'
EXPORTING
date = l_date
***使用WL variant得到的period是周/年,空则是期间/年.
***在CO-PA或做计划时,通常是以周做period的.
variant = P_variant "'WL'
IMPORTING
period = l_period
year = l_year
EXCEPTIONS
ledger_not_assigned_to_company = 1
period_not_defined = 2
variant_not_defined = 3
OTHERS = 4.
weekran-sign = 'I'.
weekran-option = 'EQ'.
CONCATENATE l_year l_period+1(2) INTO wkran.
endform.

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