When to use valueChangeListener or f:ajax listener?

Question

What\'s the difference between the following two pieces of code - with regards to listener placement?

Answer 1

for the first fragment (ajax listener attribute):

The "listener" attribute of an ajax tag is a method that is called on the server side every time the ajax function happens on the client side. For instance, you could use this attribute to specify a server side function to call every time the user pressed a key

but the second fragment (valueChangeListener) :

The ValueChangeListener will only be called when the form is submitted, not when the value of the input is changed

*you might like to view this handy answer