Design Question: How do you know witch item is selected in a

[jan-martijnw]

Hi Everyone!

I'm really struggling with this one. In our project we are using a rich panelmenu witch is dynamicly constructed in a backing bean. I'm a bit new witch JSF and now i ran into a problem. The menu can consist of three submenu's, each step deeper in the 'tree' the menu we point to another method of the backingbean ( and eventually to another page).

But now my question, when a menuItem is pressed, and de method in the backingbean is triggerd, how can i know witch item was selected? on the panel menu, i can get the "selectedItem" but than i get the value of the button, but what i really want is the ID of the item, so that Hibernate can collect that item from the DB.

I hope someone can point me in the right direction, i'm a bit stuck now.

this is the beacking bean which is constructing the HtmlPanelMenu:

import java.util.Iterator;

import javax.faces.application.Application;
import javax.faces.context.FacesContext;
import javax.faces.event.ActionEvent;
import javax.faces.model.DataModel;
import javax.faces.model.ListDataModel;

import nl.minjus.dji.sscno.kennismanagement.entities.Kennisdeelgebied;
import nl.minjus.dji.sscno.kennismanagement.entities.Kennisdomein;
import nl.minjus.dji.sscno.kennismanagement.entities.Kennisgebied;
import nl.minjus.dji.sscno.kennismanagement.service.KennisgebiedService;

import org.richfaces.component.html.HtmlPanelMenu;
import org.richfaces.component.html.HtmlPanelMenuGroup;
import org.richfaces.component.html.HtmlPanelMenuItem;



/**

 * UserMenuController.java dynamicly creates a <code>HtmlPanelMenu</code>
 * based on the 'Kennisgebieden' found in the model. The model is accessed by
 * the <code>kennisgebiedService</code> witch itself is injected by Spring framework.
 *
 *
 * @author ing. J.M. Wijnholds
 *
 */

public class UserMenuController {

 private HtmlPanelMenu panelMenu = null;

 /*
 * The Spring Bean which provides the Kennisgebied services that do the JPA
 * queries
 */
 private KennisgebiedService kennisgebiedService;

 /**
 * @return the kennisgebiedService
 */
 public KennisgebiedService getKennisgebiedService() {
 return kennisgebiedService;
 }

 /**
 * @param kennisgebiedService
 * the kennisgebiedService to set
 */
 public void setKennisgebiedService(KennisgebiedService kennisgebiedService) {
 this.kennisgebiedService = kennisgebiedService;
 }

 /**
 * Creation of the <code>HtmlPanelMenu</code> based on the
 * 'Kennisgebieden', 'Kennisdomeinen' and 'Kennisdeelgebieden'
 * found in the model
 *
 * @return A HtmlPanelMenu witch can be used in
 * <code>kms-template.xhtml</code>
 */
 @SuppressWarnings("unchecked")
 public HtmlPanelMenu getPanelMenu() {

 if (panelMenu == null) {

 /*
 * Initialize HtmlPanelMenu
 */

 panelMenu = new HtmlPanelMenu();
 panelMenu.setId("panelMenu");
 panelMenu.setStyle("width:100%");
 panelMenu.setMode("ajax");
 panelMenu.setExpandMode("ajax");
 panelMenu.setIconExpandedGroup("disc");
 panelMenu.setIconCollapsedGroup("disc");
 panelMenu.setIconExpandedTopGroup("chevronUp");
 panelMenu.setIconGroupTopPosition("left");
 panelMenu.setIconCollapsedTopGroup("chevronDown");
 panelMenu.setIconGroupTopPosition("left");

 FacesContext facesContext = FacesContext.getCurrentInstance();
 Application appl = facesContext.getApplication();

 Iterator iter = kennisgebiedService.getKennisgebieden(0, 0)
 .iterator();

 // For every 'Kennisgebied' create a new HtmlPanelMenuGroup();
 while (iter.hasNext()) {
 Kennisgebied kennisgebied = (Kennisgebied) iter.next();

 HtmlPanelMenuGroup menuItemKennisgebied = new HtmlPanelMenuGroup();
 menuItemKennisgebied.setLabel(kennisgebied.getTitel());
 menuItemKennisgebied.setName(kennisgebied.getTitel());
 menuItemKennisgebied.setIconCollapsed("triangle");
 menuItemKennisgebied.setIconExpanded("triangleDown");

 menuItemKennisgebied.setAction(appl.createMethodBinding("#{userMenuController.go}", new Class[0]));
 Iterator iterKennisDomeinen = kennisgebied.getCollectieKennisDomein().iterator();
 while (iterKennisDomeinen.hasNext()) {
 Kennisdomein kennisdomein = (Kennisdomein) iterKennisDomeinen.next();

 if (kennisdomein.getCollectieKennisdeelgebied().isEmpty()) {
 HtmlPanelMenuItem menuItem_Kennisdomein = new HtmlPanelMenuItem();
 menuItem_Kennisdomein.setLabel(kennisdomein.getTitel());
 menuItem_Kennisdomein.setName(kennisdomein.getTitel());
 // Binding the HtmlMenuItem to the temporary 'Go'method
 menuItem_Kennisdomein.setAction(appl.createMethodBinding("#{userMenuController.go}", new Class[0]));
 menuItemKennisgebied.getChildren().add(menuItem_Kennisdomein);
 } else {

 HtmlPanelMenuGroup menuItem_Kennisdomein = new HtmlPanelMenuGroup();
 menuItem_Kennisdomein.setLabel(kennisdomein.getTitel());
 menuItem_Kennisdomein.setName(kennisdomein.getTitel());
 // Binding the HtmlMenuItem to the temporary 'Go'method
 menuItem_Kennisdomein.setAction(appl.createMethodBinding("#{userMenuController.go}", new Class[0]));

 Iterator iterDeelgebieden = kennisdomein.getCollectieKennisdeelgebied().iterator();
 while(iterDeelgebieden.hasNext()){
 Kennisdeelgebied kennisdeelgebied = (Kennisdeelgebied)iterDeelgebieden.next();

 HtmlPanelMenuItem menuItem_Kennisdeelgebied = new HtmlPanelMenuItem();
 menuItem_Kennisdeelgebied.setLabel(kennisdeelgebied.getTitel());
 menuItem_Kennisdeelgebied.setName(kennisdeelgebied.getTitel());
 // Binding the HtmlMenuItem to the temporary 'Go'method
 menuItem_Kennisdeelgebied.setAction(appl.createMethodBinding("#{userMenuController.go}", new Class[0]));

 menuItem_Kennisdomein.getChildren().add(menuItem_Kennisdeelgebied);
 }

 menuItemKennisgebied.getChildren().add(menuItem_Kennisdomein);
 }


 }

 panelMenu.getChildren().add(menuItemKennisgebied);
 }
 }
 return panelMenu;
 }


 /**
 * Set a instantion of the panelMenu when a page is reloaded.
 *
 * @param panelMenu
 */
 public void setPanelMenu(HtmlPanelMenu panelMenu) {
 this.panelMenu = panelMenu;
 }

 public String go(){
 System.out.println("GET SELECTED NAME: " + panelMenu.getSelectedName());
 System.out.println("GET SUBMITTED VALUE: " + panelMenu.getSubmittedValue());
 System.out.println("GET VALUE: " + (panelMenu.getValue()));
 System.out.println("KennisId: " + FacesContext.getCurrentInstance().getExternalContext().getRequestParameterMap().get("kennisId"));
 System.out.println("nav_to_kennisgebieden_overzicht");
 return "nav_to_kennisgebieden_overzicht";
 }
}

I hope to hear from you all soon :)

Thnx in advance

Jan-Martijn

[jan-martijnw]

Someone an idea? I'm really strugling here :)

[jchouinard]

Well i would say that you would need to have params in your go method, like the current id of the selected Item. But don't know how to use it in bean generated panel tho...

[jan-martijnw]

Yes, i was also thinking in that direction but, so far i can see, it's not possible to declare these params in you go method.

Does someone know if you can use the class DataModel? For a datagrid this works fine, a can use the getRowData methode to collect the selected row. Is this also possible for the Rich Panel Menu?

[jan-martijnw]

Somebody an idea? I'm really struggeling :)

[jan-martijnw]

bumb

[jan-martijnw]

Someone an idea? Im still struggeling :)

[ilya_shaikovsky]

have you checked livedemo code? There is not panelMenu but panel bar used. But the main goal is the same.

[ilya_shaikovsky]

I mean navigation menu which stores the item that was clicked and remembers which panel should be expanded.

[jan-martijnw]

"ilya_shaikovsky" wrote:
I mean navigation menu which stores the item that was clicked and remembers which panel should be expanded.

Hi Ilya,

I've just made the whole thing work by adding the following:

UIParameter kennisgebiedId = new UIParameter();
 kennisgebiedId.setName("kennisgebiedId");
 kennisgebiedId.setValue(kennisgebied.getKennisgebiedId());
 menuItemKennisgebied.getChildren().add(kennisgebiedId);

this put's a param name "kennisgebiedId" to my request and I can use this in my backing bean to find stuff in de DB.

Very weart though, struggling with it for 4 weeks now. And just had a view days off and now I found a solution.

Thnx anyway!

JM