<p:ajaxStatus style="display:block;margin-bottom:2em;height:24px;">
    <f:facet name="default">
        <h:outputText value="Status: StandBy" />
    </f:facet>
    
    <f:facet name="start">
        <p:graphicImage name="/demo/images/ajaxloadingbar.gif" />
    </f:facet>

    <f:facet name="complete">
        <h:outputText value="Status: Completed" />
    </f:facet>
</p:ajaxStatus>

<p:ajaxStatus onstart="PF('statusDialog').show()" onsuccess="PF('statusDialog').hide()" />
			
<p:dialog widgetVar="statusDialog" modal="true" draggable="false" closable="false" resizable="false" showHeader="false">
    <p:graphicImage name="/demo/images/ajaxloadingbar.gif" />
</p:dialog>

<h:form>
    <p:commandButton value="Send" icon="pi pi-refresh" />
</h:form>