Question

I would like to add buttons dynamically from a backing bean to a JSF page (supporting Rich Faces as well).

The value of the buttons needs to be determined in run time and returned to the backing bean when the button is pressed. (Hence the title – I am actually trying to be able to do something like “#{beans.run(3)}”, i.e – set a fixed parameter to be used when clicking a button)

So for example, if the user creates a button (on run time) and gives the button a value. This value should be returned to the backing bean to be analysed.

My question – How do I assign a button (the button is a JSF component with a4j:support child) with a value at runtime? (I tried using a4j:actionParam, but couldn’t manage to work it out)

P.S – I’ve overhauled this question to be shorter and more to the point from the original-too-long-question

Answer 1

There are a number of opions:

• use JSF 2.0
• use JBoss EL extension

• use <f:setPropertyActionListener value="3" target="#{bean.propety>, where propety is later read by the run() method.

  <h:commandButton action="#{bean.run}">
      <f:setPropertyActionListener target="#{bean.property}" 
          value="#{pageVariable}" />
  </h:commandButton>
  <!-- pageVariable contains the number you are passing -->
  
  public class Bean {
     private int property; // with setters and getters
     public void run() {
        // do something with property
     }
  }
  

• use Facelets functions (here’s an example for such a function) (not applicable in all cases)