Implementing the Source Code
for the View 
The following source code text for the SalesOrder view shows you how you get the operations available for the business object and how you then bind these to the dropdown box. Firstly, create a reference to the OBN service IuserObjectBasedNavigation in the wdDoInit() method. Then determine the current user. Then you see the definition of the system and business object. You can get the list of the available operations. Dynamically filling the context node with the operations is the last implementation step in this method.
Afterwards, provide the View context with information as to how object-based navigation is to run with the selection made from the dropdown box (method onActionDropDownAction) while taking the respective operation into consideration. The context now requires for this only the name of the current operation element.
Implementation in the SalesOrderView
public void wdDoInit()
{
//@@begin wdDoInit()
//Create a reference to the OBN service
IUserObjectBasedNavigation obnService
=(IUserObjectBasedNavigation) WDPortalUtils.getServiceReference(
IUserObjectBasedNavigation.KEY);
//Determine current user
IUser user = null;
try
{
user= WDClientUser.getCurrentUser().getSAPUser();
}
catch (WDUMException e)
{
wdComponentAPI.getMessageManager().reportException(
"Failed to get current user: " +
e.getLocalizedMessage(),
true);
}
//Define system and business object
String system = "MyOBNSystem";//Name of system used
String bo = "SalesOrder";//Name of business object
//Get list of available operations
Listoperations = obnService.getTargets(system, bo, user);
//Dynamically fill the context node with the operations
if (operations != null)
{
IPrivateSalesOrderView.IOperationsElement
newOperation = null;
for (Iterator iter = operations.iterator(); iter.hasNext();)
{
IOBNTarget target = (IOBNTarget) iter.next();
newOperation =
wdContext.nodeOperations().createOperationsElement();
newOperation.setCaption(target.getOperationFriendlyName());
newOperation.setName(target.getOperationName().substring
(target.getOperationName().lastIndexOf('/')+1));
wdContext.nodeOperations().addElement(newOperation);
}
}
//@@end
}
Implementation in the Dropdown Box of the SalesOrderView
public void onActionDropDownAction(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent )
{
//@@begin onActionDropDownAction(ServerEvent)
//int sel = wdContext.nodeOperations().getLeadSelection();
//wdComponentAPI.getMessageManager().reportSuccess("Element
number "+ sel +"
selected!");
IWDNode naNode = wdContext.getChildNode("Names",0);
int leadSel = naNode.getLeadSelection();
IWDNodeElement naEl = naNode.getElementAt(leadSel);
String mode = naEl.getAttributeAsText("Cz");
IWDNodeElement newNaEl = naNode.createElement();
newNaEl.setAttributeValue("Cz",mode);
naNode.addElement(newNaEl);
//Navigation to currently selected operation and transfer of the parameter mode
if (wdContext.currentOperationsElement() != null)
{
WDPortalNavigation.navigateToObjectWithSpecificOperation
("MyOBNSystem","SalesOrder","SalesOrder",
wdContext.currentOperationsElement().getName(),
"mode="+mode+"&ShowHeader=false");
}
//@@end
}
In closing, choose the context menu entry Source ® Organize from any position in the source code so that the import for the required packages can run automatically.
In the next chapter Defining Parameter
Transfer, you will define a method – for filling the context –
which you can access from within the interface view.