selection screen里实现dropdownList

REPORT  z_temp_demo.
TYPE-POOLS vrm.
DATA: itab TYPE vrm_values,
      wa_tab TYPE vrm_value.

PARAMETERS p_no LIKE zstudent-stu_no AS LISTBOX VISIBLE LENGTH 20.

INITIALIZATION.
  wa_tab-key = '1'.
  wa_tab-text = 'Manager'.
  APPEND wa_tab TO itab.

  wa_tab-key = '2'.
  wa_tab-text = 'Worker'.
  APPEND wa_tab TO itab.

  wa_tab-key = '3'.
  wa_tab-text = 'supervisor'.
  APPEND wa_tab TO itab.

 

 

AT SELECTION-SCREEN OUTPUT.
  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id     = 'P_NO'
      values = itab.

 

START-OF-SELECTION.
  WRITE: p_no.