SAP WebClient UI创建Value help最详细的步骤

This document could be used for beginners for Webclient UI development who wants to know how to implement value help.

Example:

When clicking F4 on BusinessPartner ID,

a new window pops up as value help, you can click search button to get a list of business partners and choose one of them:

Once you mark the first search result, both ID and name would be automatically written back to your host page.

Step1: Implement GET_P method for field “BusinessPartner ID”:

CASE iv_property.
     WHEN if_bsp_wd_model_setter_getter=>fp_fieldtype.
       rv_value = cl_bsp_dlc_view_descriptor=>field_type_input.
  ENDCASE.

Implement GET_V method:

create object rv_valuehelp_descriptor type cl_bsp_wd_valuehelp_navdescr
       exporting
          iv_outbound_plug = 'OP_PARTNER_SEARCH'.

Step2: Create a new outbound plug OP_PARTNER_SEARCH: ( the name must equal to the value passed to exporting parameter in GET_V method )

define a private attribute mv_popup with TYPE REF TO if_bsp_wd_popup in your view controller.
Implement the following code:

DATA: lv_node  TYPE REF TO cl_bsp_wd_context_node.
DATA: lv_title TYPE string.

lv_title = cl_wd_utilities=>get_otr_text_by_alias( 'CRM_UIU_PROD_CUST/SEARCH_CUSTOMER' ).
mv_popup = comp_controller->window_manager->create_popup(
  iv_interface_view_name = 'SearchHelpWindow'
  iv_usage_name          = 'BPSearch'
  iv_title               = lv_title ).
mv_popup->set_display_mode( if_bsp_wd_popup=>c_display_mode_surrounded ).
mv_popup->set_on_close_event( iv_view = me iv_event_name = 'CLOSEPOPUP' ).
mv_popup->open( 'CLEAR_ALL' ).​

Step3: in step2 we try to open the popup window defined in component usage BPSearch, so we have to define that usage in runtime repository:

in code it is defined when value help window is closed, event CLOSEPOPUP will be triggered. So we create this event handler and implement it:
In the event handler, we get the selected BP information from context node PARTNER of component BP_HEAD_SEARCH and
set the content into our own field “BusinessPartner ID” and “Employee Name”:

method EH_ONCLOSEPOPUP.

DATA: lv_target_node TYPE REF TO cl_bsp_wd_context_node.
DATA: lr_node      TYPE REF TO cl_bsp_wd_context_node,
             lr_entity    TYPE REF TO if_bol_bo_property_access,
             lr_entity_bp TYPE REF TO if_bol_bo_property_access,
             lv_fullname TYPE BU_DESCRIP,
             lv_bp_id    TYPE bu_partner.

  lr_entity ?= me->typed_context->bpinfo->collection_wrapper->get_current( ).
  ASSERT lr_entity IS NOT INITIAL.
  lr_node = mv_popup->get_context_node( 'PARTNER' ).
  CHECK lr_node IS BOUND.

  lr_entity_bp = lr_node->collection_wrapper->get_current( ).
  CHECK lr_entity IS BOUND AND lr_entity_bp IS BOUND.
  lv_bp_id = lr_entity_bp->get_property_as_string( 'BP_NUMBER' ).
  CHECK lv_bp_id IS NOT INITIAL.

  lr_entity->set_property( iv_attr_name = 'BP_ID' iv_value     = lv_bp_id ).
  CALL FUNCTION 'CRM_BUPA_DESCRIPTION_READ'
      EXPORTING
         iv_partner          = lv_bp_id
      IMPORTING
         ev_description_name = lv_fullname
      EXCEPTIONS
         no_partner_specified  = 1
         no_valid_record_found = 2
         OTHERS                = 3.
   lr_entity->set_property( iv_attr_name = 'BP_NAME' iv_value     = lv_fullname ).

Note: when you create the outbound plug OP_PARTNER_SEARCH in step2, the method is created with Protected by default. You should change the visibility manually to Public:

or else you will meet with CX_BSP_WD_INCORRECT_IMPLEMENT exception, since in the runtime the framework would expect to call it as public method as below:

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