ALV Select options for ABAP Web dynpro

Here are the simple instruction of how to add select options to a web dynpro ALV table. You first need to have created a Basic Web Dynpro ALV table, Once you have this you can follow the basic steps below to implement the select options.

Step 1 - Assign ALV Component usage
Within the Used Components tab of the web dynpro component, add a new component usage WDR_SELECT_OPTIONS and give it a usage name of your choice such as SELECT_OPTIONS. 
 

Step 2 - Add new UIElements to view 
Within the layout tab of your display view(VIEW1) you need to add two new elements a ViewContainerUIElement (SELECT_OPTIONS) and a Button (BUT_UPDATE) 
 

Step 3 - Enter button text 
Add some text to the button which will be display on the actual button 
 

Step 4 - Assign Action to button 
Within the events property of your newly created button, click on the create icon 
 

Step 5 - Create Action 
Give action a name(UPDATE) and description 
 
 

Step 6 - Embed the ALV SELECT OPTIONS into VIEW Container
Go to your main window where the view (VIEW1) has been embeded. Expand the view until you reach the VIEW Container SELECT_OPTIONS. Now right click on the View Container and select 'Embed View' 
 

Step 7 - choose view to embed
Click the drop down option of the 'View to Be Embedded' field and select the TABLE view of your ALV component usage (SELECT_OPTIONS). 
 
 

Step 8 - Add component Use to view 
Within the Properties tab of your View click on the create controller usage button and add the two entries releated to your ALV SELECT_OPTIONS component use (SELECT_OPTIONS). These have to be added one at a time. 
 

Step 9 - Create view attributes 
Within the attributes tab of your view create two attributes/fields with the following details 

M_HANDLER		IF_WD_SELECT_OPTIONS
M_WD_SELECT_OPTIONS	IWCI_WDR_SELECT_OPTIONS

Step 10 - Add ABAP code to create selection fields 
Next you need to add the following ABAP code to your WDDOINTINIT or where ever you want as long as it happens before your view is displayed.

  CONSTANTS: c_yes TYPE abap_bool VALUE 'X',
             c_no TYPE abap_bool VALUE ' '.

  DATA: lt_range_table TYPE REF TO data,
        rt_range_table TYPE REF TO data,
        read_only      TYPE abap_bool,
        type_name      TYPE string.

  DATA: l_ref_cmp_usage TYPE REF TO if_wd_component_usage.

* Set up selection area
  l_ref_cmp_usage = wd_this->wd_cpuse_select_options( ).
  IF l_ref_cmp_usage->has_active_component( ) IS INITIAL.
    l_ref_cmp_usage->create_component( ).
  ENDIF.

  wd_this->m_wd_select_options = wd_this->wd_cpifc_select_options( ).

  wd_this->m_handler = wd_this->m_wd_select_options->init_selection_screen( ).

  lt_range_table =
  wd_this->m_handler->create_range_table( i_typename = 'S_CARR_ID' ).

  wd_this->m_handler->add_selection_field( i_id = 'S_CARR_ID'
                                           it_result = lt_range_table
                                           i_read_only = abap_false ).

  wd_this->m_handler->set_global_options( i_display_btn_cancel = abap_false
                                          i_display_btn_check = abap_false
                                          i_display_btn_reset = abap_false
                                          i_display_btn_execute = abap_false ).

Step 11 - React to user input 
Now you need to add the following ABAP code to the ACTION you created earlier UPDATE, associated method will be called ONACTIONUPDATE. 

 DATA: node_flights TYPE REF TO if_wd_context_node,
        rt_carrid TYPE REF TO data,
        rt_connid TYPE REF TO data.

* create table based on context structure
  data: it_scarr type STANDARD TABLE OF if_view1=>element_ALV_TABLE,
        wa_scarr like line of it_scarr.

  FIELD-SYMBOLS: 
   
     TYPE table,
                 
    
      TYPE table.

  rt_carrid = wd_this->m_handler->get_range_table_of_sel_field(
  i_id = 'S_CARR_ID' ).
  ASSIGN rt_carrid->* TO 
     
      .

*select data from required SAP table
  select *
    from scarr
    into table it_scarr
   WHERE carrid IN 
      
       .

  node_flights = wd_context->get_child_node( name = 'ALV_TABLE' ).
  node_flights->bind_elements( it_scarr  ).

      
     
    
   

Step 12 - All done 
If you now execute the application it should look similar to this