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4 Replies Latest reply: Jul 3, 2009 12:53 AM by 667016 RSS

Using EL expression to define data item for a chart

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I have a pie chart based on a ViewObject Data control. The pie chart is displaying the value of a predefined column, called Completed in the example below.
<graph IterBinding="ProjectsViewIterator" id="ProjectsView2"
       xmlns="http://xmlns.oracle.com/adfm/dvt" type="PIE">
  <graphDataMap leafOnly="true">
    <series>
      <item value="Material"/>
    </series>
    <groups>
      <data>
        <item value="Completed"/>
      </data>
    </groups>
  </graphDataMap>
</graph>
I would like to replace the constant name Completed with an EL expression, for example #{column.name}, where column is a request scope bean and name is a property. In other word, I would like to dynamically define, which column's value to display in the chart.

When trying this, on the page I get "No data to display", and the following exception:
java.lang.NullPointerException
     at oracle.adf.model.dvt.binding.transform.Utils.validateDataType(Utils.java:512)
     at oracle.adf.model.dvt.binding.transform.TransformRowIterator.validateDataType(TransformRowIterator.java:409)
     at oracle.adf.model.dvt.binding.transform.TransformRowIterator.getCell(TransformRowIterator.java:263)
     at oracle.dss.util.transform.DataTable.getCell(DataTable.java:577)
     at oracle.dss.util.transform.DataTable.processCurrentRow(DataTable.java:602)
     at oracle.dss.util.transform.DataTable.processProjection(DataTable.java:416)
     at oracle.dss.util.transform.DataTable.<init>(DataTable.java:112)
     at oracle.dss.util.transform.ResultTable.<init>(ResultTable.java:67)
     ...
Is there any way to achieve this, i.e. dynamically define the data item name?

Istvan

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