TreeByNestingTableColumn question

[Former Member]

I have followed the following tutorial, to create the TreeByNestingTableColumn:

https://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/webdynpro/tutorial on creating a tree structure in a table - 27.htm

Everything works fine, however, how can I trigger an event to the controller, when te user selects a row in the table.

I need to fire the event, and let the controller know the ID of the selected row.

Any Ideas on this?

[former_member182372 · Accepted solution]

Hi Harm,

Isn`t it described in Valery`s blog? /people/valery.silaev/blog/2005/06/20/master-of-columns-part-ii

Code from blog`s example which returns selected node elemenent

  private IPrivateTreeTableCV.IEntriesElement currentEntry()
  {
  	try
  	{
  		IWDNodeElement el;
  		for 
  		(
  			el = wdContext.nodeEntries().getTreeSelection();
  			!( el == null || el instanceof IPrivateTreeTableCV.IEntriesElement);
  			el = el.node().getParentElement()
  		);
  		return (IPrivateTreeTableCV.IEntriesElement)el;
  		
  	}
  	catch (final WDContextException ex)
  	{
  		return null;
  	}
  }

And to fire event when user selectes a row you need to define onLeadSelect event by table.

Best regards, Maksim Rashchynski.

[Former Member · Accepted solution]

Thanks for your quick reply.

However it did not work.

I do not have a getTreeSelection() method. I guess this is because I'm using a TreeByNestingTableColumn and not a Tree.

I tried the following:

  private IPrivateResultView.IBomTableElement currentEntry()
	{
		int leadSelection = wdContext.nodeBomTable().getLeadSelection();
		return (IPrivateResultView.IBomTableElement) wdContext.nodeBomTable().getElementAt(leadSelection);
	}

But, this code always returns 0.

Any suggestions?

[former_member182372 · Accepted solution]

Hi Harm,

Method getTreeSelection() is member of IWDNode class. So, it should be accessable from every context node. On which SP level you are?

Best regards, Maksim rashchynski.

[Former Member · Accepted solution]

Hi Harm,

The id what you need is part of the element in the recusive node.

If so you have to do the following.

Create a method With parameter element.

Connect that method to onLeadSelect.

use the following code inside the method.

{

String iD = element.getId();

wdThis.controller.methodname(id);

}

Regards

Ayyapparaj

[Former Member · Accepted solution]

I tried what you said:

public void onActionSelect(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent, com.asml.tpd.app.wdp.IPrivateResultView.IBomTableElement selectedElement )

{

//@@begin onActionSelect(ServerEvent)

String parent = selectedElement.getID();

}

However, when onActionSelect is called (I debugged this),

selectedElement is null. Therefore a NPE arrises on selectedElement.getID();

What is going wrong here?

Can you please help?

[former_member182372 · Accepted solution]

Hi Harm,

I have just downloaded and imported tutorial project to my NWDS and this piece of code works:

private IPrivateTreeTableView.ICatalogEntriesElement currentEntry()
{
  try
  {
	  IWDNodeElement el;
	  for 
	  (
		  el = wdContext.nodeCatalogEntries().getTreeSelection();
		  !( el == null || el instanceof IPrivateTreeTableView.ICatalogEntriesElement);
		  el = el.node().getParentElement()
	  );
	  return (IPrivateTreeTableView.ICatalogEntriesElement)el;
	
  }
  catch (final WDContextException ex)
  {
	  return null;
  }
}

Don`t really understand why you don`t like it.

Best regards, Maksim Rashchynski.

[Former Member · Accepted solution]

Maksim,

I sincerely appreciate your effort.

However, I cannot get your code to compile. I tried the following:

//@@begin javadoc:onActionSelect(ServerEvent)
	/** Declared validating event handler. */
  //@@end
  public void onActionSelect(com.sap.tc.webdynpro.progmodel.api.IWDCustomEvent wdEvent, com.asml.tpd.app.wdp.IPrivateResultView.IBomTableElement selectedElement )
  {
    //@@begin onActionSelect(ServerEvent)
    

	try
	  {
			  IWDNodeElement el;
			  for
			  (
			  		  el = wdContext.nodeBomTable().getTreeSelection();
					  !( el == null || el instanceof IPrivateTreeTableView.ICatalogEntriesElement);
					  el = el.node().getParentElement()
			  );
			  return (IPrivateTreeTableView.ICatalogEntriesElement)el;
	       
	  }
	  catch (final WDContextException ex)
	  {
			  return null;
	  }

	}

NWDS reports: The method getTreeSelection() is undefined for the type IPrivateResultView.IBomTableNode ResultView.java TestWebservice/gen_wdp/packages/com/asml/tpd/app line 302

Any suggestions?

[former_member182372 · Accepted solution]

Hi Harm,

could you please send me your project to rastchinskym AT mail DOT ru. I will take a look.

[former_member182372 · Accepted solution]

Hi Harm,

Seems like SP11`s version of Node implementation really doesn’t have getTreeSelection (in spite of setTreeSelection is there). So, you can try following code:

final IPrivateTreeTableView.ICatalogEntriesElement getRecursiveLeadSelection(

IPrivateTreeTableView.ICatalogEntriesNode __node )
{
      int leadSelection = __node.getLeadSelection();

      if( leadSelection!=IWDNode.LEAD_SELECTION ) {
IPrivateTreeTableView.ICatalogEntriesElement element = getRecursiveLeadSelection(                        __node.nodeChildCatalogEntries( leadSelection ) );

            if(element==null) {
                  return __node.currentCatalogEntriesElement();
            } else {
                  return element;
            }
      } else {
            return null;
      }
}

Best regards, Maksim Rashchynksi.