<style type="text/css">
    .ui-log {
        left: 500px;
        top: 250px;
    }
</style>

<p:log id="log" />

<h3 style="margin-top:0">Client Side API</h3>
<p:commandButton type="button" id="info" value="Info" onclick="PrimeFaces.info('This is an info message.')" />
<p:commandButton type="button" id="warn" value="Warn" onclick="PrimeFaces.warn('This is a warn message.')" />
<p:commandButton type="button" id="debug" value="Debug" onclick="PrimeFaces.debug('This is a debug message.')" />
<p:commandButton type="button" id="error" value="Error" onclick="PrimeFaces.error('This is an error message.')" />

<h3>Ajax Request</h3>
<h:form id="form">
    <h:panelGrid id="grid" columns="4" cellpadding="5">
        <p:outputLabel for="name" value="Name:" style="font-weight:bold"/>
        <p:inputText id="name" />
        <p:commandButton value="Submit" update="grid"/>
    </h:panelGrid>
</h:form>