WD Screen Variants – Assistance Class

overview

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The concept of a selection screen variant is something that most SAP users have come to expect, yet this feature is unavailable in standard Web Dynpro. Below is the next in a series of posts detailing how to bring this necessary feature back to Web Dynpro. Start here to see the full requirements.

Start a new ABAP class ZCL_WDR_SELOPT_VARIANT.  It should inherit from CL_WD_COMPONENT_ASSISTANCE in order to be a true Web Dynpro assistance class (however, this isn’t a requirement).  An Assistance Class is assigned to a Web Dynpro component for two reasons: text elements and class-based coding.

Text Elements

I use this class to hold a list of language-dependent label captions that can be translated as needed.

Classic ABAP Class-based Code

I’ve made the assistance class very important to this project by placing the list of assigned select options in this class.  It also stores a list of dynamic-date functions from RS_VARI_V_INIT.

You’ll see later where these methods are called.  The GET_TEXT method is simply a call to Web Dynpro assistance class GET_TEXT.  This makes for a more simple method call inside my Web Dynpro component.  The INIT_VARIVAR_TABLE is called at initialization to populate the MT_VARIVAR variant variables function list.

This method gets a list of the various dynamic date possibilities:

   1: METHOD init_varivar_table.

   2:  

   3:   CALL FUNCTION 'RS_VARI_V_INIT'

   4:     TABLES

   5:       p_varivar = me->mt_varivar[].

   6:  

   7: **********************************************************************

   8: * Hide these dynamic date possibilities.

   9: * We don't have factory calendars configured in D15.

  10: **********************************************************************

  11:  

  12:   DATA: ls_varivar                    TYPE rsvarivar.

  13:   LOOP AT me->mt_varivar[] INTO ls_varivar.

  14:     CASE ls_varivar-runt_fb.

  15:       WHEN 'RS_VARI_V_TODAY_XWD' OR

  16:            'RS_VARI_V_WDAYS_UP_TO_NOW' OR

  17:            'RS_VARI_V_XWD_ACTUAL_MONTH'.

  18:  

  19:         DELETE TABLE me->mt_varivar[] FROM ls_varivar.

  20:  

  21:       WHEN OTHERS.

  22:     ENDCASE.

  23:   ENDLOOP.

  24:  

  25: ENDMETHOD.

Next, let’s dive into the Web Dynpro component itself.

overview

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