Question

I cannot seem to find where is @DataModel and @DataModelSelection in Seam3 (as opposed to Seam2). In what Seam module are they defined? If their name has been changed, what is it currently?

Answer 1

Assuming you are using JSF2.0, you can ‘inject’ selection to action methods like this:

<h:dataTable value="#{itemManager.itemList}" var="item">
   <h:column>
      <f:facet name="header">Item Id</f:facet>
      #{item.id}
   </h:column>
   <h:column>
      <f:facet name="header">Item Name</f:facet>
      #{item.name}
   </h:column>
   <h:column>
      <f:facet name="header">Action</f:facet>
      <h:commandLink value="Delete" action="#{itemManager.delete(item)}" />
   </h:column>
</h:dataTable>

and corresponding managed bean:

@ManagedBean(name="itemManager")
@SessionScoped
public class ItemManager {
    ArrayList<Item> itemList;

    public ArrayList<Item> getItemList() {
        if (itemList == null) {
            itemList = ... // build item list
        }
        return itemList;
    }

    public String delete(Item item) {
        itemList.remove(item);
        return null;
    }
}