Hi,

I have a Seam application with a list of checkboxes:

<a4j:outputPanel id="auswahl1" layout="block">
  <ul>
    <a4j:repeat value="#{fd.subTree1}" var="item">
      <li>
        <span>
          <h:selectBooleanCheckbox value="#{fd.selectedGroupMap1[item]}">
            <a4j:support event="onclick" reRender="auswahl1"/>
          </h:selectBooleanCheckbox>
          <h:outputText value="#{item.name}" />
        </span>
      </li>
    </a4j:repeat>
  </ul>
</a4j:outputPanel>

What I want to do:
If the user clicks on one of the checkboxes, all other checkboxes shall be unchecked first (under a special condition - business logic, so I can't use radio buttons).

The selectBooleanCheckbox uses a Map in my bean (fd) for saving all selected items:

private Map<Item, Boolean> selectedGroupMap1;

So there is no setter where I can clean the map before setting a new value.

How can I do this? I tried an actionListener in the a4j:support element. But it is called after setting the newly checked item. So I have no selected items at all after calling the listener.

Any ideas? Thanks in advance!

Martin