How to set auto-incremented column in PrimeFaces DataTable?

Question

I want to use PrimeFaces <p:dataTable>. I have written this code:

<p:dataTable var="v" value="#{bean.dataValues}">

    <p:column headerText="First Column">
       <h:outputText value="" />  
    </p:column>  

    <p:column headerText="Second Column">
       <h:outputText value="value of second column" />  
    </p:column>  

    <p:column headerText="Third Column">
       <h:outputText value="value of third column" />  
    </p:column>  

</p:dataTable>

Now I want to get this kind of result in my XHTML page:

1. | value of second column | value of third column
2. | value of second column | value of third column
3. | value of second column | value of third column
4. | value of second column | value of third column

The first column is very important for me. This column must be auto-incremented and doesn't involve any value of bean.dataValues. If the List bean.dataValues includes 4 elements, the first column of the datatable must be auto-incremented from 1 to 4 for each value in datatable. How can help?

Thanks ! Marwief

Answer 1

Use the rowIndexVar property of <p:dataTable> like the following.

<p:dataTable var="v" value="#{bean.dataValues}" rowIndexVar="rowIndex">

    <p:column headerText="First Column">
        <h:outputText value="#{rowIndex+1}"/>
    </p:column>

    ...

</p:dataTable>