selectOneMenu ajax events

The PrimeFaces ajax events sometimes are very poorly documented, so in most cases you must go to the source code and check yourself.

p:selectOneMenu supports change event:

<p:selectOneMenu ..>    <p:ajax event="change" update="msgtext"        listener="#{post.subjectSelectionChanged}" />    <!--...--></p:selectOneMenu>

which triggers listener with AjaxBehaviorEvent as argument in signature:

public void subjectSelectionChanged(final AjaxBehaviorEvent event)  {...}

I'd rather use more convenient itemSelect event. With this event you can use org.primefaces.event.SelectEvent objects in your listener.

<p:selectOneMenu ...>    <p:ajax event="itemSelect"         update="messages"        listener="#{beanMB.onItemSelectedListener}"/></p:selectOneMenu>

With such listener:

public void onItemSelectedListener(SelectEvent event){    MyItem selectedItem = (MyItem) event.getObject();    //do something with selected value}

Be carefull that the page does not contain any empty component which has "required" attribute as "true" before your selectOneMenu component running.
If you use a component such as

<p:inputText label="Nm:" id="id_name" value="#{ myHelper.name}" required="true"/>

then,

<p:selectOneMenu .....></p:selectOneMenu>

and forget to fill the required component, ajax listener of selectoneMenu cannot be executed.