我偶然发现了一种出乎意料的行为，至少对我来说是这样。使用 ui:repeat 时，似乎我可以从外部访问 var。
代码 - 页面：
<f:metadata>
<f:event type="preRenderView" listener="#{xTest.init()}" />
</f:metadata>
<h:form id="xTestForm">
<h:panelGroup layout="block">
Track: #{trk.name}
</h:panelGroup>
<table>
<ui:repeat
value="#{xTest.trackList}"
var="trk">
<tr>
<td>#{trk.name}</td>
<td>
<p:commandLink
actionListener="#{xTest.setTrack(track)}"
value="test"
update=":xTestForm" />
</td>
</tr>
</ui:repeat>
</table>
</h:form>
代码 - 豆
package beans;
import dao.DAOFactory;
import dao.track.TrackDAO;
import dto.Track;
import exceptions.DAOException;
import java.io.Serializable;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.ViewScoped;
import javax.faces.context.FacesContext;
import util.MessageUtil;
@ManagedBean
@ViewScoped
public class xTest implements Serializable {
private DAOFactory daoFactory = Config.getInstance().getDAOFactory();
private TrackDAO trackDAO;
private Track track = new Track();
private MessageUtil msg = new MessageUtil();
private List<Track> trackList = new ArrayList();
public xTest() {
trackDAO = daoFactory.getTrackDAO(true);
}
public void init() {
if (!FacesContext.getCurrentInstance().isPostback()) {
try {
trackList = trackDAO.listByAlbumid(241);
} catch (SQLException | DAOException ex) {
msg.setErrorMessage(ex);
}
}
}
public List<Track> getTrackList() {
return trackList;
}
public void setTrack(Track track) {
this.track = track;
}
}
如果单击曲目列表中的链接，则曲目名称将显示在 panelGroup 中。这怎么可能？