title: Insert only digits as input
body: <p>Currently I have a <code>&lt;h:inputText&gt;</code></p>
  
  <pre><code>&lt;h:outputLabel value="#{locale.nroEmployees}:"/&gt;
  &lt;h:inputText value="#{companyEditBean.companyEmployeesAmount}"
            disabled="#{not companyEditBean.editingAllowed}"&gt;
  &lt;/h:inputText&gt;                      
  </code></pre>
  
  <p>How can  I achieve, that the user can only type digits in input fields?</p>