Using ABAP instrution to change screen field properties

Hi,
I've a screen (SE51) and i need to change field properties using an ABAP instrution.
I need to do this... if variable LV_NDEP_IN is not initial, user can't change field content.
I've tried this...
IF lv_ndep_in IS INITIAL.
    SET CURSOR FIELD 'LV_NDEP_IN'.
ELSEIF lv_ndep_in IS NOT INITIAL.
    screen-input = ' '.
    MODIFY SCREEN.
ENDIF.
but doesn't work.
Can somebody help me ?
Thanks,

Moderator message - Please do not ask or answer basic questions
Points unassigned and thread locked
Rob

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Change screen fields properties

Hi all,
I am using a loop screen to change the properties of some teh fields od the following screen:
SELECTION-SCREEN BEGIN OF BLOCK bl3 WITH FRAME TITLE text-003.
PARAMETERS: cb_af_e AS CHECKBOX USER-COMMAND abc.
PARAMETERS: p_pep LIKE anla-posnr,
                         p_centro LIKE anlz-kostl.
SELECTION-SCREEN END OF BLOCK bl3.
AT SELECTION-SCREEN OUTPUT.
IF cb_af_e = 'X'.
   LOOP AT SCREEN.
      IF screen-name = 'P_PEP' OR screen-name = 'P_CENTRO'.
        screen-input = 1.
      ENDIF.
      MODIFY SCREEN.
    ENDLOOP.
ELSE.
    LOOP AT SCREEN.
      IF screen-name = 'P_PEP' OR screen-name = 'P_CENTRO'.
        screen-input = 0.
      ENDIF.
      MODIFY SCREEN.
    ENDLOOP.
ENDIF.
Now, I would like to make fields P_PEP and P_CENTRO obligatory when checkbox cb_af_e is active.
Thanks a lot!
Regards,
Reyes.

Hi
U should use a MESSAGE error to check if the user has inserted the parameter, because if you set the REQUIRED characteristic you can't deactive the checkbox:
SELECTION-SCREEN BEGIN OF BLOCK BL3 WITH FRAME TITLE TEXT-003.
PARAMETERS: CB_AF_E AS CHECKBOX USER-COMMAND ABC.
PARAMETERS: P_PEP LIKE ANLA-POSNR,
P_CENTRO LIKE ANLZ-KOSTL.
SELECTION-SCREEN END OF BLOCK BL3.
AT SELECTION-SCREEN OUTPUT.
IF CB_AF_E = 'X'.
    LOOP AT SCREEN.
      IF SCREEN-NAME = 'P_PEP' OR SCREEN-NAME = 'P_CENTRO'.
        SCREEN-INPUT = 0.
      ENDIF.
      MODIFY SCREEN.
    ENDLOOP.
ENDIF.
AT SELECTION-SCREEN.
IF CB_AF_E = 'X'.
    IF P_PEP IS INITIAL.
      LOOP AT SCREEN.
        IF SCREEN-NAME = 'P_PEP'.
          EXIT.
        ENDIF.
      ENDLOOP.
      IF SCREEN-INPUT = 1.
        MESSAGE E208(00) WITH 'Insert P_REP'.
      ENDIF.
    ENDIF.
    IF P_CENTRO IS INITIAL.
      LOOP AT SCREEN.
        IF SCREEN-NAME = 'P_CENTRO'.
          EXIT.
        ENDIF.
      ENDLOOP.
      IF SCREEN-INPUT = 1.
        MESSAGE E208(00) WITH 'Insert P_CENTRO'.
      ENDIF.
    ENDIF.
ENDIF.
Max

Table for Screen Field Properties

Hi Guys,
I have strange requirement.
Lets say i have designed 5 fields in the Dialog Program. 2 fields belongs to Group1,another 2 fields belongs to Group2 and 3rd field is belongs to group3.
Where can i find those values (I mean which table). I belive it should be Program,screen no and data type.
Note : Groups you can set in Attributes of the field in Dialog Program.
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Setting Screen Field Attributes
Every screen field has attributes that you set in the Screen Painter when you define the
screen. At runtime, you may want to change these attributes, depending on what
functions the user has requested in the previous screen. At runtime, attributes for each
screen field are stored in a memory table called SCREEN. You do not need to declare
this table in your program. The system maintains the table for you internally and updates
it with every screen change.
The memory table SCREEN contains the following fields:
Name Length Description
NAME 30 Name of the screen field
GROUP1 3 Field belongs to field group 1
GROUP2 3 Field belongs to field group 2
GROUP3 3 Field belongs to field group 3
GROUP4 3 Field belongs to field group 4
ACTIVE 1 Field is visible and ready for input
REQUIRED 1 Field input is mandatory
INPUT 1 Field is ready for input
OUTPUT 1 Field is for display only
INTENSIFIED 1 Field is highlighted
INVISIBLE 1 Field is suppressed
LENGTH 1 Field output length is reduced
DISPLAY_3D 1 Field is displayed with 3D frames
VALUE_HELP 1 Field is displayed with value help
To activate a field attribute, set its value to 1. To deactivate it, set it to 0. When you set
the ACTIVE attribute to 0, the system suppresses the field and turns off the ready for
input attribute. The user can neither see the field nor enter values into it.
Note
You can define values for each of these attributes in the Attribs. for 1 field section in
the field list of the Screen Painter. If you need more information about attribute
meanings, see BC ABAP/4 Workbench Tools.
Modifying the Screen SAP AG
Setting Screen Field Attributes
32u20134 May 1997
As an example of modifying the screen dynamically, start with transaction tz50
(development class SDWA).
The transaction consists of two screens. In the first screen the user can enter flight
identifiers and either request flight details (by pressing a Display pushbutton) or press the
Change pushbutton to change the data of screen 200.
The field attributes are now set dynamically, according to whether the Display button or
the Change button was selected. In both cases the same screen is now called, but with
different field attributes.
If the same attributes need to be changed for several fields at the same time, these fields
can be grouped together. For example, in order to change the fields in screen 200
dynamically, we assign these fields in the Screen Painter to the group MOD. You can
specify up to four modification groups for each field. The contents of the Groups field
are stored in the SCREEN table.
The changes to the attributes of the fields in this group can be implemented in a PBO
module:
SAP AG Modifying the Screen
Setting Screen Field Attributes
May 1997 32u20135
MODULE MODIFY_SCREEN OUTPUT.
CHECK MODE = CON_SHOW.
L0OP AT SCREEN.
CHECK SCREEN-GROUP1 = u2019MODu2019.
SCREEN-INPUT = u20190u2019.
MODIFY SCREEN.
ENDLOOP.
ENDMODULE.
The memory table SCREEN contains each field of the current screen together with its
attributes.
The LOOP AT SCREEN statement puts this information in the header line of this system
table.
In this example taken from transaction tz50, if the user chooses Display then SCREENINPUT
is set to u20190u2019 and all fields belonging to the MOD group thus become display-only
fields.
Because attributes have been changed, the MODIFY SCREEN statement is used to write
the header line back to the table.
Modifying the Screen SAP AG
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Hi Experts,
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Edited by: starry99 on Nov 3, 2009 4:59 PM

Hi,
<li>Try this. It works.
REPORT ztest_program.
DATA: BEGIN OF it_kna1 OCCURS 0,
        kunnr TYPE kna1-kunnr,
        name1 TYPE kna1-name1,
      END OF it_kna1.
DATA:
    i_return_tab TYPE STANDARD TABLE OF ddshretval,
    w_return_tab TYPE ddshretval.
DATA:w_dynpfields TYPE dynpread,
    i_dynpfields LIKE STANDARD TABLE OF dynpread.
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME.
TABLES kna1.
SELECTION-SCREEN BEGIN OF BLOCK r01 WITH FRAME TITLE text-003.
SELECTION-SCREEN BEGIN OF LINE.
SELECTION-SCREEN POSITION 1.
SELECTION-SCREEN COMMENT (28) FOR FIELD cust.
SELECT-OPTIONS: cust FOR kna1-kunnr NO INTERVALS NO-EXTENSION. "   <--------the customer code
SELECTION-SCREEN POSITION 48.
PARAMETERS: name1 LIKE kna1-name1.              " <--------the customer name
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SELECTION-SCREEN END OF BLOCK r01.
SELECTION-SCREEN END OF BLOCK b1.
AT SELECTION-SCREEN OUTPUT.
LOOP AT SCREEN.
    IF screen-name = 'NAME1'.
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      screen-output = '1'.
      screen-display_3d = '0'.
      MODIFY SCREEN.
    ENDIF.
ENDLOOP.
"F4 Help for Werks
AT SELECTION-SCREEN ON VALUE-REQUEST FOR cust-low.
IF it_kna1[] IS INITIAL.
    SELECT kunnr name1
    FROM kna1
    INTO TABLE it_kna1.
ENDIF.
"Function module for F4 help
CALL FUNCTION 'F4IF_INT_TABLE_VALUE_REQUEST'
    EXPORTING
      retfield    = 'KUNNR'   "field name on f4 help window
      dynpprog    = sy-repid
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      dynprofield = 'CUST-LOW' "Screen field name
      value_org   = 'S'
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IF sy-subrc = 0.
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        dyname     = sy-repid
        dynumb     = sy-dynnr
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Venkat.O

How ti disable screen fields in Module pool

hi
How to change screen fields to DISPLAY MODE aftr clicking on a particular pushbutton in Module pool prg .
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Edited by: chetan teli on Jul 29, 2008 1:04 PM

hiiii
use following code for disabling field
IF p_rad2 IS INITIAL .
    LOOP AT SCREEN.
      IF screen-name CS 'p_docno'.
        screen-active = 0.
        MODIFY SCREEN.
      ENDIF.                           " IF screen-name CS 'p_docno'.
    ENDLOOP.                           " LOOP AT SCREEN.
ELSE.
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Using ABAP instrution to change screen field properties

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