How to programmatically add elements to a value node in Web Dynpro for Java

Background

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This article demonstrates how to programmatically add elements to a node value. Web Dynpro has this concept of context programming. A context is a hierarchical tree data structure that can consist of nodes where each node can represent a list of elements something similar in Java.

Hardware Environment

n/a

Software Environment

Windows 7 Professional SP1
Java 2 SDK 1.4.2 for Windows 32-bit
SAP NetWeaver Developer Studio Version 7.0.09 for Java
SAP NetWeaver Application Server
- sap.com/SAP-JEECOR – 7.00 SP26 (1000.7.00.26.1.20120307143343)
- sap.com/SAP-JEE – 7.00 SP26 (1000.7.00.26.0.20120109175405)

Create a Web Dynpro Project

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Create a Web Dynpro Project via File -> New -> Web Dynpro Project

Modify the View

1. Open the NodeElementSampleView by double-clicking it, go to the implementation tab, and put some codes

Add the following block of code within the //@begin others and //@end

 private class UserType {
  	private String userType;
  	private String userTypeDescription;
  	
  	public UserType(){}
  	public UserType(String userType, String userDescription) {
  		this.userType = userType;
  		this.userTypeDescription = userDescription;
  	}
	
	public String getUserType() { return userType; }
	public String getUserTypeDescription() { return userTypeDescription; }
	public void setUserType(String string) { userType = string; }
	public void setUserTypeDescription(String string) { userTypeDescription = string; }
  }

private class UserType {

private String userType;

private String userTypeDescription;

public UserType(){}

public UserType(String userType, String userDescription) {

this.userType = userType;

this.userTypeDescription = userDescription;

}

public String getUserType() { return userType; }

public String getUserTypeDescription() { return userTypeDescription; }

public void setUserType(String string) { userType = string; }

public void setUserTypeDescription(String string) { userTypeDescription = string; }

}

2. Add the following codes within the wdDoInit() method and between //@@begin wdDoInit() and //@@end

List userTypeList = new ArrayList();
	userTypeList.add(new UserType("admin", "Administrator"));
	userTypeList.add(new UserType("editor", "Editor"));
	userTypeList.add(new UserType("anon", "Anonymous"));
    
    for(int i = 0; i < userTypeList.size(); i++) {
		IPrivateNodeElementSampleView.IVn_UserTypeListElement e = wdContext.nodeVn_UserTypeList().createVn_UserTypeListElement();
		e.setUserType(((UserType)userTypeList.get(i)).getUserType());
		e.setUserTypeDescription(((UserType)userTypeList.get(i)).getUserTypeDescription());
		wdContext.nodeVn_UserTypeList().addElement(e);
    }