title: filtering using dropdown list primefaces datatable
body: <p>jsf 2.0 primefaces 5.1 glassfish 4</p>
  
  <p>i am using filtering via a dropdown list, when i click an item on the list the datatable gets filtered but the value in the dropdown list still shows "select one" instead of the selected value</p>
  
  <pre><code>&lt;p:column headerText="Region" filterBy="#{wan.Region}"
              filterMatchMode="contains" &gt;
        &lt;f:facet name="filter"&gt;
            &lt;p:selectOneMenu onchange="PF('table').filter()"&gt;
                  &lt;f:selectItem itemLabel="Select One" itemValue="#{null}"
                                noSelectionOption="true" /&gt;
                  &lt;f:selectItems value="#{wandbBean.regions}" /&gt;
            &lt;/p:selectOneMenu&gt;
        &lt;/f:facet&gt;
        &lt;h:outputText value="#{wan.Region}" /&gt;
  &lt;/p:column&gt;
  </code></pre>