Richard Santos

In visual basic, you could easily change any property of a specific control dynamically. We could also do that in ABAP. The sample code below will show you the basics on how to loop on all objects in a screen and change its property at runtime.

Let say we have a set of textbox in our screen that contains details of a single customer from table KNA1(General Data in Customer Master). Now we want to disable all textboxes that has already a value on it so that empty textboxes are the only editable field in the screen. To do this, we need to create a code on PBO(Process Before Output) module that will loop on all objects in the screen.

But before we proceed with the coding, we have to specify a MODIF ID or Modification Group ID. This will enable us to modify object before the selection screen is displayed, using the statement MODIFY SCREEN. The name of the modification group ID must be directly specified and can have a maximum length of three characters. There are two ways to set the mod ID of an object.

One is through code:

PARAMETERS: p_sample TYPE c LENGTH 10 MODIF ID GR1.

In this sample code, we set the mod ID of p_sample to “GR1″

Another way is through screen painter:

On the screen painter, select a specific object on the screen and then go to its attributes(double click or press F2). A window will appear showing the attributes of the object. You will see 4 textboxes in a row which is indicated as Groups. Type-in GR1 in the first textbox. Close the attributes window and click save.

We could now create the codes that will loop on all objects in a screen. In our case, we only want to loop on all textboxes in a screen so set the mod ID of all textboxes to GR1.

FIELD-SYMBOLS : <FS> TYPE ANY.

LOOP AT SCREEN.
  IF SCREEN-GROUP1 = ‘GR1′.
    ASSIGN (SCREEN-NAME) TO <FS>.
    IF <FS> IS NOT INITIAL.
      SCREEN-INPUT    = ‘0′.
    ENDIF.
  ENDIF.
  MODIFY SCREEN.
ENDLOOP.

Using the code above, one loop pass is executed for every screen element of the current dynpro. SCREEN-NAME is the name of the element, SCREEN-GROUP1 refers to the modification group of the element, and SCREEN-INPUT is the input property of the element. MODIFY SCREEN affects the attributes input, output and invisible.

The table below shows the components of screen and their assignment to the field properties in the dynpro.

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