[WDA] WEB DYNPRO 에서 Dropdown 만들기

출처: http://www.sapdev.co.uk/sap-webapps/sap-webdynpro/wdp-dropdown.htm

Below are the simple steps required to add a field to your abap web dynpro which displays a dropdown list of values to the user using the dropdown by index UI element..

Step 1- Create context to store dropdown values Within your web dynpro application
You need to create a context node to store the dropdown values, this will generally involve using a structure which contains a code and a text value i.e. you will display the text value to the user but reteive the code value for internal processing! For this example I will use fields CARRID and CARRNAME from structure SCARR to create the dropdown list.

First double click on the COMPONENTCONTROLLER(with inleft hand tree structure) and select the 'Context' tab. Now add a new node to the context node (right click the context and select Create->Node). Give the new node a name and enter which table structure you want to base it on (i.e. SCARR). Also rememeber to set the cardinality to 0:n (or 1:n) to denote a table. You will also need to click the 'Add Attribute from Structure' button and select the fields you want to use for your drop down table i.e. CARRID and CARRNAME.


Step 2 - Map context to VIEW
Within the Context tab of your view drag the context you have just created (DROPDOWN_CARRIERS) from the right hand window and drop it onto the context node in the left window, select yes from the popup window that asks you if you want to copy and map context.


Step 3 - Create dropdown UI Element
Within the layout tab of the view, right click on the ROOTUIELEMENTCONTAINER within the UI element hierarchy and select Insert Element, Now Select DropDownByIndex and give it a name. See here for more details on creating ABAP Web Dynpro UI element


Step 4 - Assign Dropdown Ui element to Context
Click on your UI element within the Layout tab, you will now see all the properties for this element which can be changed. You now need to assign the field within your created context which you want to be displayed in the drop down i.e. for the example it will be the CARRNAME field within context element DROPDOWN_CARRIERS. To do this simply click on the button at the end of the 'texts' property, the one with a yellow square and circle on it!


Step 5 - ABAP code to populate dropdown list
Insert the following ABAP code into the appropriate place. For this example it will go into the WDDOINIT method

* create local data variable to access context information
  Data: context_node type ref to if_wd_context_node.

* create table based on context structure
  Data: it_carriers type STANDARD TABLE OF if_view1=>element_DROPDOWN_CARRIERS,
        wa_carriers like line of it_carriers.

  select *
    from scarr
    into table it_carriers.
  context_node = wd_context->get_child_node( name = 'DROPDOWN_CARRIERS').
  context_node->BIND_TABLE( it_carriers ).

Step 6 - Save, Activate and Run
Save and activate your abap web dynpro, now when you execute it you should see a drop down object similar to the following: