For displaying the UserId the table uses a special column, a drilldown column. This triggers a hyperlink which, in our application, results in a branch to the detail view. The data should not be processed in this view. The Edit button is used for this.

To react suitably to this event, we include a corresponding Callback method in our UserBrowseAction. Since we do not wish to implement the business logic here, we forward the event to another action - UserDisplayAction. This can then load the detailed information and call the corresponding JSP page for display.

import java.io.IOException;
import javax.servlet.ServletException;

import com.cc.framework.adapter.struts.ActionContext;
import com.cc.framework.adapter.struts.FWAction;
import com.cc.framework.ui.control.ControlActionContext;
import com.cc.framework.ui.control.SimpleListControl;

import com.cc.sampleapp.common.Forwards;
import com.cc.sampleapp.common.Messages;
import com.cc.sampleapp.dbaccess.DBUser;
import com.cc.sampleapp.presentation.dsp.UserDisplayList;

public class UserBrowseAction extends FWAction {

    /**
     * @see com.cc.framework.adapter.struts.FWAction#doExecute(ActionContext)
     */
    public void doExecute(ActionContext ctx)
        throws IOException, ServletException {

    try {
            UserDisplayList dspData = DBUser.fetch();
            SimpleListControl userList = new SimpleListControl();
            userList.setDataModel(dspData);
            ctx.session().setAttribute("users", userList);
        }
        catch (Throwable t) {
            ctx.addGlobalError(Messages.ERROR, t);
        }

        // Display the Page with the UserList
        ctx.forwardToInput();
    }

    /**
     * This Method is called when the Drilldown-Column is clicked
     * In our Example we switch to the DetailView, which shows
     * more Information about the User. It's a readonly View.
     * @param   ctx ControlActionContext
     * @param   key     UniqueKey, as it was defined in the UserDisplayList
     *          to identify the Row. In this Example the UserId.
     */
    public void users_onDrilldown(ControlActionContext ctx, String key) {
        ctx.forwardByName(Forwards.DRILLDOWN, key);
    }
}

The name of the CallBack is composed of the Property name of the TreeControl -the name of the Bean- and the event that has occurred. Since the ListControl was saved in the Session under the name "users" the name of the CallBack method is users_onDrilldown.

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