Step 1. Enable the server node debugging using the SAP Config Tool.

Web Dynpro framework provides the parameter mapping to allow server-side event handler receive the value of client-side event parameter.

The process of parameter is achieved as follows:

• Obtain the name of the parameter associated with the client-side event. This can be found by looking in the documentation of the UI element and looking at the mappingOf{ui_event}() method. For example, by looking at IWDCheckBox.mappingOfOnToggle(), you will find that the event has a parameter called checked which is of type boolean.
  
• Create an action {act} in the view controller.
  
• Define a parameter for the action of the same data type as the event parameter. You will often find it helpful to make the server-side action parameter name the same as the client-side event parameter name, though this is not mandatory.
  
• Associate the event parameter with the action parameter. The coding to do this is shown in the next example.

Radio Button

The RadioButton UI element is a button with two states (on/off) that enables users to select options. The RadioButton allows to spread the displayed radio buttons individually on the screen instead of grouping them in a table. You can toggle the radio button when you
bind the UI elements to the same context attribute.

There are two important properties of this UI element.

KeyToSelect

This property specifies the value of the key used to select this radio button. You can use the constant for each radio button.

SelectedKey

Specifies the path of the context attribute that stores the selected key. All the radio buttons bind to the same context attribute logically belong to the same group.

There are several event parameters can be mapped into action handler parameters. All these event parameters are defined as the constants in the inner class – IWDTable.IWDOnSort.

NODE_ELEMENT - Name of the implicit event parameter nodeElement
COL - Name of event parameter col. The id of the column to be sorted.
DIRECTION - The direction in which the sorting has been requested.
MUILTPLE - Indicates that the supplied column should be sorted additional to the previously existing sorting. Type boolean.

1. How to add SAP icons in the Web Dynpro UI elements like button, image?

You can find my another post – Web Dynpro – Use Icons on how to add sap standard icons. If you can access the web application server remotely, you can find all these SAP icons gif files from file system usrsap<System ID><System No>j2eeclusterserver0tempwebdynprowebsap.comtc~wd~dispwdaglobalsapIcons’.

2. Where can I find a list Web Dynpro API?

From here, you can find the public Web Dynpro API documentation.

Below diagram shows a the typical development concept of SAP Java.

1. Create a new Web Dynpro DC

Create a new Web Dynpro project or a WD DC in a software component.

2. Create a new Model from the WSDL file

Generally, there are two model type for Web Service. One is Adaptive Web Service Model, the other is Web Service Model which has been marked as deprecated. In this example, I will use the Adaptive RFC Model.

The default JDBC drivers are delivered in library component: com.sap.portal.jdbcdrivers. You can find a list of JDBC driver library for each DBMS - P9sybase.jar, P9db2.jar, P9oracle.jar, P9informix.jar, P9sqlsever.jar.

You can add your aliases in the DataSource definition. Aliases are alternative names that are used by the application components when they look up a DataSource object. Below figure shows the aliases used by SAP standard applications.

• SAP Java Enterprise Runtime – comprises low-level modules that provide functions such as class loading, cluster communication, persistent configuration data management, and so on. For more information, see SAP Java Enterprise Runtime.
•  Pluggable components – consists of interfaces, libraries and services components that provide various runtime functions and programming APIs. For more information, see Pluggable Components.
• Applications layer – refers to the applications that are deployed and run on the SAP J2EE Engine. For more information, see Applications.

What the Web Dynpro Framework is?

Web Dynpro Framework is just another web framework like Struts, WebWork and other open source web framework in the Java community.