When to use valueChangeListener or f:ajax listener?

When to use valueChangeListener or f:ajax listener?

ajax jsf jsf-2 listener valuechangelistener

ajax

JSF 2 - How can I add an Ajax listener method to composite component interface?

java ajax jsf-2 listener composite-component

ajax

Using JSF 2.0 / Facelets, is there a way to attach a global listener to all AJAX calls?

java ajax redirect jsf-2 listener

ajax