Proplem: Access HTMLB controls from java code

Question

Hi,
I am new to iView development for EP6. So my problem should be easy to solve (for you ).
I created in the NW Dev Studio a JSP DynPage.
The following files were created or edited:
1.     JSP file (created)
2.     java file (created)
3.     portalapp.xml (edited)
In order to make the page running (proccessing) I changed the following things:
1.     JSP file – Add taglib reference to HTMLB-class
2.     portalapp.xml – Remove the „native“ property so the JSP file will not be accessed directly.
Now I want to do the following:
On the JSP page I placed severeal HTMLB controls (textViews).
From the java code I try to access these controls in the „doProcessBeforeOutput“ method and change/set values.
But I get all the time a null-Exception.
Code (JSP)
<%-- mcmsprovider.jsp --%>
<%@ taglib uri= "tagLib" prefix="hbj" %>
<hbj:content id="cntMcmsProvider" >
  <hbj:page title="MCMS Provider Dynpage">
   <hbj:form id="frmMcmsProvider" >
             <hbj:textView id="tvwScript" encode="false"></hbj:textView>
             <hbj:textView id="tvwStyle" encode="false"></hbj:textView>
   </hbj:form>
  </hbj:page>
</hbj:content>
Code (JAVA):
public void doProcessBeforeOutput() throws PageException {
       this.setJspName("mcmsprovider.jsp");
       TextView tvw = (TextView) this.getComponentByName("tvwStyle");
       tvw.setText("Here the dynamic text");
I also tried to add raw text to the form but also null excpetion:
public void doProcessBeforeOutput() throws PageException {
       this.setJspName("mcmsprovider.jsp");
       Form frmCurrent = (Form) this.getForm();
       frmCurrent.addRawText("<h3>This comes from here</h3>");
My goal is to dynamically add controls to the form, but until now I think it will be a dream:
public void doProcessBeforeOutput() throws PageException {
       this.setJspName("mcmsprovider.jsp");
  Form form = (Form)this.getForm();
       TextView tvw  = new TextView("tvwDynamic");
       tvw.setText("Here the dynamic control");
       form.addComponent(tvw);
The normal page processing runs:
public void doProcessBeforeOutput() throws PageException {
       this.setJspName("mcmsprovider.jsp");
Any help is greatly appreciated.

Answer 1

Eike
Here is the example straight from the PDK documentation. This should help you a little
UsingAbstractPortalComponentWithHTMLB.java
import com.sapportals.htmlb.*;
import com.sapportals.htmlb.enum.DataType;
import com.sapportals.htmlb.enum.GroupDesign;
import com.sapportals.htmlb.event.Event;
import com.sapportals.htmlb.rendering.IPageContext;
import com.sapportals.htmlb.rendering.PageContextFactory;
import com.sapportals.portal.prt.component.AbstractPortalComponent;
import com.sapportals.portal.prt.component.IPortalComponentRequest;
import com.sapportals.portal.prt.component.IPortalComponentResponse;
public class UsingAbstractPortalComponentWithHTMLB extends AbstractPortalComponent {
    //Fill in your output for "normal" content creation mode here
    protected void doContent(IPortalComponentRequest request, IPortalComponentResponse response) {
        IPageContext myContext = PageContextFactory.createPageContext(request, response);
        if (myContext == null) {
            System.out.println("htmlb service did not start up as expected.");
        Form myForm = myContext.createFormDocument("First Experiment");
        Event lastEvent = myContext.getCurrentEvent();
        Group myGroup = new Group();
        myGroup.setWidth("350");
        myGroup.setTitle("First Experiment");
        myGroup.setDesign(GroupDesign.SAPCOLOR);
        myForm.addComponent(myGroup);
        GridLayout gl = new GridLayout();
        myGroup.addComponent(gl);
        if ((lastEvent != null) && (lastEvent.getComponentName().equals("submit"))) {
            String name = myContext.getDataForComponentId("USER_NAME").toString();
            TextView label = new TextView("Hi, " + name);
            gl.addComponent(1, 1, label);
            Button myButton = new Button("goback", "Go back");
            myButton.setOnClick("goBack"); // ignored anyway
            gl.addComponent(2, 1, myButton);
        } else {
            TextView label = new TextView("What's your name?");
            gl.addComponent(1, 1, label);
            InputField inf = new InputField("USER_NAME");
            inf.setType(DataType.STRING);
            gl.addComponent(1, 2, inf);
            Button myButton = new Button("submit", "Tell");
            myButton.setOnClick("submit");
            gl.addComponent(2, 2, myButton);
        myContext.render();