How to update a value displayed in the page without refreshing

Question

I have this 3 fields in a JSF page

Answer 1

If this is simple calculation, which doesn't need server call then you should go with client side javascript solution

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But As you love to do it using Ajax here you go..

You can use and render attribute to make this thing happen using AJAX .

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@ManagedBean(name = "managedBean") 
public class Bean { 
   private String val1; // getter and setter 
   private String val2; // getter and setter 
   private String res; // getter and setter 
   ... 

   public void someThingToDoListener(AjaxBehaviorEvent event) { 
       //res = some processing
    }

}

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See Also

• JSF2: Ajax in JSF – using f:ajax tag