Value Help in Web Dynpro ABAP - Tutorial. Applies to: Web Dynpro for ABAP, For more information, visit the Web Dynpro ABAP homepage. Summary In this tutorial I want to explain how to set value help for UI elements of your Web Dynpro ABAP application. Author: Patrick Johann Company: SAP Created on: 12. March 2009 Author Bio Patrick Johann is in the first year of Vocational Training as an IT Specialist Application Development at SAP. At the moment he is working in a SAP Net Weaver Product Management User Interaction Team and is doing Web Dynpro for ABAP. 2008 SAP AG 1
Table of Content Exercise Objectives:...3 Know and use the different kinds of value helps...3 Process at runtime:...3 Procedure:...3 READ_CARRID:...3 VALUESET_CARRID:...4 Related Contents...5 Copyright...6 2009 SAP AG 2
Exercise Objectives: Know and use the different kinds of value helps Create a DropDownByKey UI-element and define the value help dynamically Process at runtime: The user looks at a view which offers a drop down input field and three regular input fields. They don t have an effect but every element has its own value help. Procedure: 1. Start the Object Navigator (transaction code SE80). Create a new Web Dynpro component (suggested name: Z##_VALUE_HELP ), one window and one view (suggested names: MAIN_WINDOW and MAIN_VIEW ). Embed the view in the window if it hasn t been done automatically. 2. Navigate to COMPONENTCONTROLLER. Create a context node named FLIGHTINFO (cardinality 1:1) with the type of the dictionary structure SFLIGHT, and with the attributes CARRID, CONNID, FLDATE und PRICE. 3. Click on the attribute CARRID. With the click the attribute properties appear below. Look at the Input Help Mode property and change it to automatically if it isn t set already to it. Do the same with the FLDATE attribute. For CONNID choose Dictionary Search Help, and for PRICE deactivate the help mode, because we don t want a value help for this input. The automatic help mode will be defined at Web Dynpro runtime. It uses an already defined value help from the dictionary element you use. The Dictionary Search Help property allows the developer to choose a dictionary defined value help. 4. Now we want to set an individual value set for the CARRID attribute. This has to been done dynamically in the view controller, but first we have to write a few lines of code to get the data from the dictionary. Create a new method in the component controller (suggested name: READ_CARRID ). Define an exporting parameter of type WDY_KEY_VALUE_TABLE in the signature of your created method. To get the data from the dictionary you only have to code an array fetch on the table SCARR into your itab. Select the fields Carrid and Carrname. Then order the itab by carrid. READ_CARRID: METHOD read_carrid. SELECT carrid carrname FROM scarr INTO TABLE e_carrier_vs ORDER BY carrid. ENDMETHOD. 2009 SAP AG 3
5. Now navigate to the view controller and add a new method (suggested name: VALUESET_CARRID ). Use the code wizard to call the created method in your component controller. Moreover declare two local objects with reference to IF_WD_CONTEXT_NODE and IF_WD_CONTEXT_NODE_INFO. Navigate from the context to FLIGHTINFO with the context method get_child_node( ). After that, call the method get_node_info( ). To set the new value set, call the method set_attribute_value_set( ) of your local node info. VALUESET_CARRID: METHOD valueset_carrid. DATA lo_nd_flightinfo TYPE REF TO if_wd_context_node. DATA lo_nd_info_flightinfo TYPE REF TO if_wd_context_node_info. DATA lt_value_set TYPE wdy_key_value_table. DATA lo_componentcontroller TYPE REF TO ig_componentcontroller. lo_nd_flightinfo = wd_context->get_child_node( name = 'FLIGHTINFO' ). lo_nd_info_flightinfo = lo_nd_flightinfo->get_node_info( ). lo_componentcontroller = wd_this->get_componentcontroller_ctr( ). lo_componentcontroller->read_carrid( IMPORTING e_carrier_vs = lt_value_set ). lo_nd_info_flightinfo->set_attribute_value_set( name = 'CARRID' value_set = lt_value_set ). ENDMETHOD. 6. Open the hook method WDDOINIT of the view and implement the method that you created in the previous step to get the value set BEFORE the view is displayed. 7. Now we go back to the COMPONENTCONTROLLER and have a look at the node attribute CONNID. In step three we chose the dictionary search as the help mode. You get another input field called Dictionary search help. Enter ZSHG_H_SPFLI_CONNID. This value help shows more details to the connection than the regular help for the CONNID field. 8. Map the Context from your controller to the context of the view and implement a form on the layout with the code wizard and display all node attributes. 9. Finally delete the generated Input Field for Carrid and replace it by a DropDownByKey UI element. Bind the necessary selectedkey property to Carrid and correct the generated label. 2009 SAP AG 4
Related Contents For more information, visit the Web Dynpro ABAP homepage. For more information, visit the User Interface Technology homepage. 2009 SAP AG 5
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