ajax4jsf - the difference between a4j ajax listener and action in ajax call. -

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please me understand difference between a4j ajax listener , action in ajax call. 

<a4j:commandbutton id="abc" value="abc">     <a4j:ajax execute="@this"      ***listener="#{mybean.update()}"** or action = "#{#{mybean.update()}"***     oncomplete="#{rich:component('mypopup')}.show(); return false;" /> </a4j:commandbutton>

i removed <a4j:ajax > tags below. 

<a4j:commandbutton id="abc" value="abc">     execute="@this"     action = "#{mybean.update()"     oncomplete="#{rich:component('mypopup')}.show(); return false;" /> </a4j:commandbutton>

then work action , <a4j:ajax > tags, action doesn't trigger method in bean while listener triggered.


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