I ended up defining a custom converter for the object, which appears to be
doing its job correctly. The problem it still does not bind the selected items
to the list in the h:selectManyListbox's value attribute. This appears to
happen when I use s:convertEntity (or a custom converter) in conjunction with
a4j:support. If I remove the converter, I do get a list of Strings bound to the
value attribute... but this doesn't really help me. What is going on here?
My xhtml:
| <h:selectManyListbox
value="#{campaignSelector.selectedAdvertisers}"
converter="genericEntityConverter">
| <s:selectItems
value="#{campaignSelector.availableAdvertisers}" var="advertiser"
label="#{advertiser.name}" />
| <a4j:support event="onchange"
reRender="campaignSelector" />
| </h:selectManyListbox>
|
My converter:
| //This converter can be used for entities extending ConvertibleEntity
| @Name("genericEntityConverter")
| @Scope(org.jboss.seam.ScopeType.APPLICATION)
| @org.jboss.seam.annotations.faces.Converter(id="genericEntityConverter")
| public class GenericEntityConverter implements Converter {
|
| @In
| private EntityManager entityManager;
|
| public Object getAsObject(FacesContext facesContext, UIComponent
uiComponent, String entityId) throws ConverterException {
| String[] strings = entityId.split("@");
| if(strings.length == 2) {
|
| String tableName = strings[0];
| Integer id = Integer.valueOf(strings[1]);
| String query = "from " + tableName + " where id=:id";
| Object entity = (Object)
entityManager.createQuery(query).setParameter("id", id).getSingleResult();
| return entity;
| } else {
| throw new ConverterException("The converter could not
get the object associated with the id: " + entityId);
| }
| }
|
| public String getAsString(FacesContext facesContext, UIComponent
uiComponent, Object object) {
| ConvertibleEntity entity = (ConvertibleEntity) object;
| return entity.getEntityId();
| }
|
|
| }
|
| public abstract class ConvertibleEntity {
| public abstract String getEntityId();
| public abstract String getEntityName();
| }
|
| //example of ConvertibleEntity implementation
| @Transient
| public String getEntityId() {
| return "Advertiser@" + this.getId().toString();
| }
|
| @Transient
| public String getEntityName() {
| return "Advertiser";
| }
|
|
I have stepped through in the debugger, and the converter's getAsObject method
is being called and getting the Object from the EM... but when I get into the
getAvailableCampaigns method on the action bean, the selectedAdvertisers list
is still empty... what is going on here?
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http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4116766#4116766
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