import javax.el.ELContext;

import javax.el.ExpressionFactory;

import javax.el.MethodExpression;
import javax.el.ValueExpression;

import javax.faces.context.FacesContext;

import oracle.jbo.Row;

import org.apache.myfaces.trinidad.event.SelectionEvent;

public class PieChartSelectionBean {
public PieChartSelectionBean() {
}

/**
 * Programmatic invocation of a method that an EL evaluates to.
 *
 * @param el EL of the method to invoke
 * @param paramTypes Array of Class defining the types of the parameters
 * @param params Array of Object defining the values of the parametrs
 * @return Object that the method returns
 */
public static Object invokeEL(String el, Class[] paramTypes, Object[] params) {
FacesContext facesContext = FacesContext.getCurrentInstance();
ELContext elContext = facesContext.getELContext();
ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
MethodExpression exp = expressionFactory.createMethodExpression(elContext, el, Object.class, paramTypes);

return exp.invoke(elContext, params);
}

/**
 * Programmatic evaluation of EL.
 *
 * @param el EL to evaluate
 * @return Result of the evaluation
 */
public static Object evaluateEL(String el) {
FacesContext facesContext = FacesContext.getCurrentInstance();
ELContext elContext = facesContext.getELContext();
ExpressionFactory expressionFactory = facesContext.getApplication().getExpressionFactory();
ValueExpression exp = expressionFactory.createValueExpression(elContext, el, Object.class);

return exp.getValue(elContext);
}

/**Custom Selection Listener for dvt:pieChart
 * @param selectionEvent
 */
public void pieChartSelectionListener(SelectionEvent selectionEvent) {
// Makes selected slice as current row
invokeEL("#{bindings.Employees1.collectionModel.makeCurrent}", new Class[] { SelectionEvent.class }, new Object[] {
selectionEvent });
// Get the selected row (Use pie chart iterator name)
Row selectedRow = (Row) evaluateEL("#{bindings.Employees1Iterator.currentRow}"); // get the current selected row
// Get any attribute from selected row
System.out.println("Selected Employee is-" + selectedRow.getAttribute("FirstName"));

}

}

0 thoughts on “Get selected slice of dvt:pieChart using custom selection listener in ADF”

1. Thanks ashish, really helpful article. For example, in pie chart, the dataSelection = 'mulitiple', how do we get all the values selected?

   Reply

2. Hi Pavan

   You can iterate over SelectedRowKeys of pie chart using this code
   
   RowKeySet selectedEmps = getPieCartBind().getSelectedRowKeys();
   Iterator selectedEmpIter = selectedEmps.iterator();
   DCBindingContainer bindings = (DCBindingContainer) BindingContext.getCurrent().getCurrentBindingsEntry();
   DCIteratorBinding empIter = bindings.findIteratorBinding("Employees1Iterator");
   RowSetIterator empRSIter = empIter.getRowSetIterator();
   while (selectedEmpIter.hasNext()) {
   Key key = (Key) ((List) selectedEmpIter.next()).get(0);
   Row currentRow = empRSIter.getRow(key);
   System.out.println(currentRow.getAttribute("FirstName"));
   }
   

   Reply

3. In adf jdeveloper 11g release 1 instead of showing collectionModel it is showing me graphModel; therefore I think that the code is not working. Please help me out for this.

   Reply

4. Hi Vigya

   Check this for 11g graphModel code How to get Selected graph point details in ADF Graphs

   Ashish

   Reply

5. Thank you sir, but still I am facing an error…
   ADF_FACES-60096:Server Exception during PPR, #1
   javax.el.PropertyNotFoundException: Target Unreachable, identifier 'BarGraph' resolved to null
   at com.sun.el.parser.AstValue.getTarget(Unknown Source)
   at com.sun.el.parser.AstValue.invoke(Unknown Source)
   at com.sun.el.MethodExpressionImpl.invoke(Unknown Source)
   Please tell me why is this error coming and how can I resolve it.

   Reply

6. and what is this "BarGraph" in your code ?

   Reply

7. bean class name

   Reply

8. You need to share your graph xml source , Make sure bean is registered with taskFlow and accessible on page

   Reply

9. This comment has been removed by the author.

   Reply

10. Hi Ashish

    My graph Value Propery has "#{bindings.Employee1.graphModel}" instead of "#{bindings.Employee1.collectionModel}". I'm using ADF 11.1.2.4.0. I don't see "collectionModel" when I expand the ADF Bindings tree.

    Thanks.

    Fede.

    Reply

11. Hi Federico

    Check link i have shared in above comments

    Ashish

    Reply