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The series Web Dynpro Selection Screen Variants continues from Part 2 with creation of the Web Dynpro Component and its component controller.

Part 3: Component and Controller

Create new Web Dynpro component ZWDR_SELECT_OPTIONS_VARI with assistance class ZCL_WD_SELECT_OPTIONS_VARIANT. Next, add the following Context, Attributes and Methods to the Component Controller.

Context

Create context node VARIANT with the following properties then add to it attributes VARIANT and VTEXT from dictionary structure ZWDVARI.

Node Name
VARIANT
Dictionary Structure
ZWDVARI
Cardinality 1..1
Selection 0..1
Initialization Lead Selection checked

 

Create context node CONFIRM with the following properties then add to it attribute VARIANT from dictionary structure ZWDVARI.

Node Name
CONFIRM
Dictionary Structure
ZWDVARI
Cardinality 0..n
Selection 0..n
Initialization Lead Selection checked

 

Attributes

Create the following four public attributes.

Methods

Create four custom methods and implement hook method WDDOPOSTPROCESSING.

INITIALIZE

Mark method initialize as an interface method. It is this method callers will use to connect the variants functionality with the other component’s selection screen.

method INITIALIZE .

  wd_this->mv_application = application_name.
  wd_this->mv_component = component_name.
  wd_this->mt_select_options_ref = select_options_set.

endmethod.

VARIANT_DELETE

METHOD variant_delete .

  CHECK wd_this->mv_component IS NOT INITIAL AND
        wd_this->mv_application IS NOT INITIAL.

* -- Delete variants

  LOOP AT variant_tab ASSIGNING FIELD-SYMBOL(<variant>).

    DATA(ls_return) = wd_assist->variant_delete(
      component   = wd_this->mv_component
      application = wd_this->mv_application
      variant     = <variant>-variant
    ).

    wd_this->wd_get_api( )->get_message_manager( )->report_t100_message(
      msgid = ls_return-msgid
      msgno = ls_return-msgno
      msgty = ls_return-msgty
      p1    = ls_return-msgv1
      p2    = ls_return-msgv2
      p3    = ls_return-msgv3
      p4    = ls_return-msgv4
    ).

  ENDLOOP. " <variant>

ENDMETHOD.

VARIANT_GET

method VARIANT_GET .

  CHECK wd_this->mv_component IS NOT INITIAL AND
        wd_this->mv_application IS NOT INITIAL.

* -- Fetch variant contents into select-options references

  wd_assist->variant_get(
    EXPORTING
      component          = wd_this->mv_component
      application        = wd_this->mv_application
      variant            = variant-variant
    CHANGING
      select_options_ref = wd_this->mt_select_options_ref
  ).

endmethod.

VARIANT_SAVE

METHOD variant_save .

  CHECK wd_this->mv_component IS NOT INITIAL AND
        wd_this->mv_application IS NOT INITIAL.

* -- Save variant

  DATA(ls_return) = wd_assist->variant_save(
    component          = wd_this->mv_component
    application        = wd_this->mv_application
    variant            = variant-variant
    short_text         = variant-vtext
    select_options_ref = wd_this->mt_select_options_ref
  ).

  wd_this->wd_get_api( )->get_message_manager( )->report_t100_message(
    msgid = ls_return-msgid
    msgno = ls_return-msgno
    msgty = ls_return-msgty
    p1    = ls_return-msgv1
    p2    = ls_return-msgv2
    p3    = ls_return-msgv3
    p4    = ls_return-msgv4
  ).

ENDMETHOD.

WDDOPOSTPROCESSING

method WDDOPOSTPROCESSING .

* -- If component was not properly initialized, issue error message

  CHECK wd_this->mv_component IS INITIAL OR
        wd_this->mv_application IS INITIAL OR
        wd_this->mt_select_options_ref IS INITIAL.

  wd_this->wd_get_api( )->get_message_manager( )->report_error_message(
    message_text = 'ZWDR_SELECT_OPTIONS_VARI was improperly initialized'
  ).

endmethod.

Up Next

In Part 4, the series continues with creation of the views and windows.

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