title: How to show water mark in filter in primefaces?
body: <p>I have filters for columns.</p>
  
  <p>Here i want to show water mark in filter (As Shown in figure in red circle)</p>
  
  <p>I am using prime faces 3.4</p>
  
  <p>I have tred this</p>
  
  <pre><code>&lt;h:form id="parametersListForm" prependId="false"&gt;      
      &lt;p:dataTable id="parameteresList" value="#{parameterController.lstParameter}" 
                       var="parameters" selectionMode="single"  
                       selection="#{parameterController.selectedParameter}" 
                       styleClass="tnt-main-table"&gt; 
  
              &lt;p:ajax event="rowSelect" update=":parameterDetailsForm"
                      listener="#{parameterController.onParametersRowSelect}" /&gt;
  
        &lt;p:column id="colomnRefType" filterBy="#{parameters.beRefType}" 
                   headerText="#{msgs['parameters.beRefType.label']}"
                   filterMatchMode="contains"&gt;
                                  &lt;h:outputText value="#{parameters.beRefType}"/&gt;
              &lt;p:watermark value="Ref Type" 
                           forElement= ":parameteresList:colomnRefType_filter"&gt;
               &lt;/p:watermark&gt;
          &lt;/p:column&gt;
        &lt;/p:dataTable&gt;              
      &lt;/h:form&gt;
  </code></pre>
  
  <p><img src="https://i.stack.imgur.com/IL6UW.jpg" alt="enter image description here"></p>
  
  <p>How can I achieve this?</p>