Get the current node of a tree in Oracle ADF | Techartifact

Requirement- To get the current selected node of tree and get value of that node.

We will be writing selectionListener for that tree in managed bean.first we invoke the default tree selection listener with the expression
#{bindings.Departments.treeModel.makeCurrent}. In order to do this, we use a helper method called invokeMethodExpression(). Then, we obtain the currently selected node from the tree by calling getRowData() on the component (obtained earlier from the selection event).

    public void treeRowSelectionlistener(SelectionEvent selectionEvent) {
        invokeMethodExpression("#{bindings.checklistStructureVO1.treeModel.makeCurrent}", Object.class, SelectionEvent.class, selectionEvent);
        RichTree tree = (RichTree)selectionEvent.getSource(); // get the tree component from the event
           TreeModel model = (TreeModel)tree.getValue();    
           //get selected nodes
           RowKeySet rowKeySet = selectionEvent.getAddedSet();
        Iterator rksIterator = rowKeySet.iterator();
        //Validating for single select only. Need to check for multiselect
        while (rksIterator.hasNext()) {
            List key = (List);
            JUCtrlHierBinding treeBinding = null;
            CollectionModel collectionModel = (CollectionModel)tree.getValue();
            treeBinding = (JUCtrlHierBinding)collectionModel.getWrappedData();            
            JUCtrlHierNodeBinding nodeBinding = null;
            nodeBinding = treeBinding.findNodeByKeyPath(key);
            Row rw = nodeBinding.getRow();
            int seqId = ((BigDecimal)rw.getAttribute("ChecklistStructureId")).intValue(); // We can get the column name value from that node or row. 
            String elementId=((BigDecimal)rw.getAttribute("ElementId")).toString();
            String ChecklistStructureId=((BigDecimal)rw.getAttribute("ChecklistStructureId")).toString();
            String ElementName=(String)rw.getAttribute("ElementName"); 
            Object result = ob1.execute();
            if (!ob1.getErrors().isEmpty()){
                List errorList = ob1.getErrors();
                System.out.println("ERROR IN VC EXECUTION");
                // Capture and handle Error

        private Object invokeMethodExpression(String expr, Class returnType, Class[] argTypes, Object[] args){
           FacesContext fc = FacesContext.getCurrentInstance(); 
           ELContext elctx = fc.getELContext();
           ExpressionFactory elFactory = fc.getApplication().getExpressionFactory(); 
           MethodExpression methodExpr = elFactory.createMethodExpression(elctx,expr,returnType,argTypes);    
           return methodExpr.invoke(elctx,args); 

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I am an Oracle ACE in Oracle ADF/Webcenter. Sr Java Consultant-working on Java/J2EE/Oracle ADF/Webcenter Portal/ content and Hibernate for several years. I'm an active member of the OTN JDeveloper/Webcenter forum. Passionate about learning new technologies. I am here to share my knowledge. Give your views and suggestion on [email protected] .

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