The TreeControl automatically generates an onDrilldown-Event on clicking on a label, to which the programmer can react within the action class.

To react to this event in our example, we include a corresponding Callback method in the ProductTreeBrowseAction. Since we do not wish to implement the business logic here, we forward the event to another action - ProductDisplayAction.

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.TreeControl;

import com.cc.sampleapp.common.Forwards;

public class ProductTreeBrowseAction extends FWAction {

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

        try {
            ProductGroupDsp data = DBProduct.fetch();
            TreeControl products = new TreeControl();
            products.setDataModel(data);
            ctx.session().setAttribute("products", products);
        }

        catch (Throwable t) {
            ctx.addGlobalError("Error: ", t);
        }

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

    // ------------------------------------------------
    //          Tree-Control Event Handler
    // ------------------------------------------------


    /**
     * This Method is called when the TreeLabel is clicked
     * In our Example we switch to the DetailView, which shows
     * more Information about the node.
     * @param   ctx ControlActionContext
     * @param   key     UniqueKey, as created in the Datamodel
     */
    public void  products_onDrilldown(ControlActionContext ctx, String key) {
        ctx.forwardByName(Forwards.DRILLDOWN, key);
    }

}