Menu, MenuBar, MenuButton, TieredMenu, SlideMenu Primefaces Esempio

Tutorial
JSF

L’obiettivo principale di questo tutorial è coprire i principali componenti del menu utilizzati con l’implementazione di Primefaces. Tipicamente, un’enorme quantità di applicazioni distribuite su Internet utilizza diverse forme di menu. Questo tutorial coprirà i seguenti tipi di menu:

  • Menu: è un componente di navigazione con sottomenu e voci di menu.
  • MenuBar: è un componente di navigazione orizzontale.
  • MenuButton: viene utilizzato per visualizzare diverse azioni in un menu a comparsa.
  • TieredMenu: viene utilizzato per visualizzare sottomenu nidificati con sovrapposizioni.
  • SlideMenu: viene utilizzato per visualizzare sottomenu nidificati con animazione a scorrimento.

Cominciamo spiegando tutti questi tipi di menu per vedere tutte le funzionalità offerte da Primefaces per questo tipo di componenti.

Primefaces Menu – Informazioni di Base

Tag menu
Component Class org.primefaces.component.menu.Menu
Component Type org.primefaces.component.Menu
Component Family org.primefaces.component
Renderer Type org.primefaces.component.MenuRenderer
Renderer Class org.primefaces.component.menu.MenuRenderer

Primefaces Menu – Attributi

Name Default Type Description
id null String Unique identifier of the component.
rendered true Boolean Boolean value to specify the rendering of the component, when set to false component will not be rendered.
binding null Object An el expression that maps to a server side UIComponent instance in a backing bean.
widgetVar null String Name of the client side widget.
model null MenuModel A menu model instance to create menu programmatically.
trigger null String Target component to attach the overlay menu.
my null String Corner of menu to align with trigger element.
at null String Corner of trigger to align with menu element.
overlay false Boolean Defines positioning type of menu, either static or overlay.
style null String Inline style of the main container element.
styleClass null String Style class of the main container element.
triggerEvent click String Event to show the dynamic positioned menu.

Menu di Primefaces – Introduzione

A menu is composed of submenus and menuitems. Submenus are used to group menuitems, while menuitems correspond to those actions required. Following example shows you the most simplest use of Menu component. index.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:menu>
		<p:submenu label="File">
			<p:menuitem value="Open"></p:menuitem>
			<p:menuitem value="Edit"></p:menuitem>
			<p:separator/>
			<p:menuitem value="Exit"></p:menuitem>
		</p:submenu>
		<p:submenu label="Help">
			<p:menuitem value="About Primefaces"></p:menuitem>
			<p:menuitem value="Contact Us"></p:menuitem>
			<p:separator/>
			<p:menuitem value="Help"></p:menuitem>
		</p:submenu>
	</p:menu>
</h:form>
</html>

Menu di Primefaces – Menu Sovrapposto

Il menu può essere posizionato in due modi: statico o dinamico. La posizione statica significa che il menu è nel flusso normale della pagina. Al contrario, i menu dinamici non sono nel flusso normale della pagina, permettendo loro di sovrapporsi ad altri elementi. Per definire il menu dinamicamente, è necessario seguire i seguenti passaggi:

  • Definire il menu normalmente impostando l’attributo overlay su true e associando l’attributo trigger del menu con l’id dell’azione attivata.
  • Regolare entrambi gli attributi del menu my e at per specificare l’angolo del menu da allineare con l’elemento trigger e l’angolo del trigger da allineare con l’elemento del menu, rispettivamente.
  • Coppie di sinistra, destra, fondo e alto sono gli unici valori accettati per gli attributi my e at.

index1.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:menu overlay="true" trigger="triggerButton" my="left top" at="right top">
		<p:submenu label="File">
			<p:menuitem value="Open"></p:menuitem>
			<p:menuitem value="Edit"></p:menuitem>
			<p:separator/>
			<p:menuitem value="Exit"></p:menuitem>
		</p:submenu>
		<p:submenu label="Help">
			<p:menuitem value="About Primefaces"></p:menuitem>
			<p:menuitem value="Contact Us"></p:menuitem>
			<p:separator/>
			<p:menuitem value="Help"></p:menuitem>
		</p:submenu>
	</p:menu>
	<p:commandButton id="triggerButton" value="Trigger Menu"></p:commandButton>
</h:form>
</html>

  • Una volta attivata l’azione di Trigger Menu, il menu definito viene visualizzato.

Primefaces Menu – Azioni Ajax e Non-Ajax

Finora, hai sviluppato un semplice menu statico e uno più complicato dinamico. Entrambi questi menu contengono voci di menu che corrispondono alle azioni richieste che il menu si propone di fornire. Queste voci di menu sono in realtà azioni simili a p:commandButton, quindi è possibile applicare l’ajax a esse. index2.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:growl id="message"></p:growl>
	<p:menu overlay="true" trigger="triggerButton" my="left top" at="right top">
		<p:submenu label="File">
			<p:menuitem value="Open" action="#{menuManagedBean.openAction}" update="message"></p:menuitem>
			<p:menuitem value="Edit"></p:menuitem>
			<p:separator/>
			<p:menuitem value="Exit"></p:menuitem>
		</p:submenu>
		<p:submenu label="Help">
			<p:menuitem value="About Primefaces"></p:menuitem>
			<p:menuitem value="Contact Us"></p:menuitem>
			<p:separator/>
			<p:menuitem value="Help"></p:menuitem>
		</p:submenu>
	</p:menu>
	<p:commandButton id="triggerButton" value="Trigger Menu"></p:commandButton>
</h:form>
</html>

MenuManagedBean.java

package com.journaldev.prime.faces.beans;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

@ManagedBean
@SessionScoped
public class MenuManagedBean {
	public String openAction(){
		FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Open action has activiated asynchrounsly !"));
		return "";
	}
}

Primefaces Menu – Menu Dinamici

I menu possono essere creati anche programmaticamente, ciò è più flessibile rispetto all’approccio dichiarativo. È possibile definire un menu in questo modo utilizzando un’istanza di org.primefaces.model.MenuModel. Componenti come p:submenu, p:menuitem e p:separator hanno anche la propria implementazione predefinita che viene utilizzata per definire il menu programmaticamente. L’esempio seguente mostra lo stesso scenario aziendale che hai sviluppato in precedenza, questa volta il menu verrà renderizzato in modo programmato. index3.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form>
	<p:growl id="message"></p:growl>
	<p:menu overlay="true" trigger="triggerButton" my="left top" at="right top" model="#{menuManagedBean.menu}">
	</p:menu>
	<p:commandButton id="triggerButton" value="Trigger Menu"></p:commandButton>
</h:form>
</html>

MenuManagedBean.java

package com.journaldev.prime.faces.beans;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

import org.primefaces.model.menu.DefaultMenuItem;
import org.primefaces.model.menu.DefaultMenuModel;
import org.primefaces.model.menu.DefaultSeparator;
import org.primefaces.model.menu.DefaultSubMenu;
import org.primefaces.model.menu.MenuModel;

@ManagedBean
@SessionScoped
public class MenuManagedBean {
	private MenuModel menu = new DefaultMenuModel();

	public MenuManagedBean(){
		// Crea submenu
		DefaultSubMenu file = new DefaultSubMenu("File");
		// Crea submenu
		DefaultSubMenu help = new DefaultSubMenu("Help");
		// Crea menuitem
		DefaultMenuItem open = new DefaultMenuItem("Open");
		// Crea menuitem
		DefaultMenuItem edit = new DefaultMenuItem("Edit");
		// Crea menuitem
		DefaultMenuItem exit = new DefaultMenuItem("Exit");

		// Crea menuitem
		DefaultMenuItem about = new DefaultMenuItem("About Primefaces");
		// Crea menuitem
		DefaultMenuItem contact = new DefaultMenuItem("Contact Us");
		// Crea menuitem
		DefaultMenuItem helpMenuItem = new DefaultMenuItem("Help");		

		// Determina l'azione del menuitem
		open.setCommand("#{menuManagedBean.openAction}");

		// Associa il menuitem al submenu
		file.addElement(open);
		file.addElement(edit);
		file.addElement(new DefaultSeparator());
		file.addElement(exit);

		help.addElement(about);
		help.addElement(contact);
		help.addElement(new DefaultSeparator());
		help.addElement(helpMenuItem);

		// Associa il submenu al menu
		menu.addElement(file);
		menu.addElement(help);
	}

	public MenuModel getMenu() {
		return menu;
	}

	public void setMenu(MenuModel menu) {
		this.menu = menu;
	}

	public String openAction(){
		FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Open action has activiated asynchrounsly !"));
		return "";
	}
}

Primefaces Menubar – Informazioni di Base

Il menù è un componente di navigazione orizzontale.

Tag Menubar
Component Class org.primefaces.component.menubar.Menubar
Component Type org.primefaces.component.Menubar
Component Family org.primefaces.component
Renderer Type org.primefaces.component.MenubarRenderer
Renderer Class org.primefaces.component.menubar.MenubarRenderer

Primefaces Menubar – Attributi

Name Default Type Description
id null String Unique identifier of the component.
rendered true Boolean Boolean value to specify the rendering of the component, when set to false component will not be rendered.
binding null Object An el expression that maps to a server side UIComponent instance in a backing bean.
widgetVar null String Name of the client side widget
model null MenuModel MenuModel instance to create menus
programmatically
style null String Inline style of menubar
styleClass null String Style class of menubar
autoDisplay false Boolean Defines whether the first level of submenus will be displayed on mouseover or not. When set to false, click event is required to display.

Primefaces Menubar – Iniziare

Simile al componente Menu, Menubar richiede p:submenu e p:menuitem come figli per comporre il menubar.

Primefaces Menubar – Menu a Livelli

Menubar supporta menu annidati, ovvero fornendo sottomenu all’interno di un altro menu genitore. index5.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form style="width:400px;">
	<p:menubar>
		<p:submenu label="File">
			<p:submenu label="Open">
				<p:menuitem value="Open Excel File"></p:menuitem>
				<p:menuitem value="Open Word File"></p:menuitem>
				<p:menuitem value="Open Power Point File"></p:menuitem>
			</p:submenu>
			<p:menuitem value="Edit"></p:menuitem>
			<p:separator/>
			<p:menuitem value="Exit"></p:menuitem>
		</p:submenu>
		<p:submenu label="Help">
			<p:menuitem value="About JournalDev"></p:menuitem>
			<p:menuitem value="Contact Us"></p:menuitem>
			<p:separator/>
			<p:menuitem value="Help"></p:menuitem>
		</p:submenu>
	</p:menubar>
</h:form>
</html>

Primefaces Menubar – Elemento di Menu Radice

La barra dei menu ha anche supportato il menuitem radicato, ovvero fornendo un componente figlio diretto p:menuitem all’interno di p:menubar. index6.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form style="width:400px;">
	<p:menubar>
		<p:menuitem value="Open"></p:menuitem>
	</p:menubar>
</h:form>
</html>

Primefaces Menubar – Azioni Ajax e non Ajax

Allo stesso modo del componente p:commandButton, anche p:menuitem ha supportato azioni con ajax. Hai già sperimentato questo nella sezione p:menu. Puoi utilizzare p:menuitem per eseguire azioni – sia Ajax che non Ajax – e anche per la navigazione. Il seguente esempio ti mostra i diversi utilizzi di p:menuitem. index7.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form style="width:400px;">
<p:growl id="message"></p:growl>
	<p:menubar>
		<p:submenu label="File">
			<p:submenu label="Open">
				<p:menuitem value="Ajax Action" action="#{menubarManagedBean.ajaxAction}" update="message"></p:menuitem>
				<p:menuitem value="Non Ajax Action" action="#{menubarManagedBean.nonAjaxAction}" ajax="false"></p:menuitem>
				<p:menuitem value="Go To JournalDev" url="https://www.journaldev.com"></p:menuitem>
			</p:submenu>
			<p:menuitem value="Edit"></p:menuitem>
			<p:separator/>
			<p:menuitem value="Exit"></p:menuitem>
		</p:submenu>
		<p:submenu label="Help">
			<p:menuitem value="About JournalDev"></p:menuitem>
			<p:menuitem value="Contact Us"></p:menuitem>
			<p:separator/>
			<p:menuitem value="Help"></p:menuitem>
		</p:submenu>
	</p:menubar>
</h:form>
</html>

MenubarManagedBean.java

package com.journaldev.prime.faces.beans;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

@ManagedBean
@SessionScoped
public class MenubarManagedBean {
	public String ajaxAction(){
		FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Ajax Update"));
		return "";
	}

	public String nonAjaxAction(){
		return "";
	}
}

Menù Primefaces – Menu Dinamici

Il menù ha anche supportato la creazione dinamica, è possibile creare il menù programmaticamente e fornire azioni Ajax, Non-Ajax e URL come hai fatto nella sezione Azioni Ajax e Non-Ajax. index8.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form style="width:400px;">
<p:growl id="message"></p:growl>
	<p:menubar model="#{menubarManagedBean.menubar}">
	</p:menubar>
</h:form>
</html>

MenubarManagedBean.java

package com.journaldev.prime.faces.beans;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

import org.primefaces.model.menu.DefaultMenuItem;
import org.primefaces.model.menu.DefaultMenuModel;
import org.primefaces.model.menu.DefaultSeparator;
import org.primefaces.model.menu.DefaultSubMenu;
import org.primefaces.model.menu.MenuModel;

@ManagedBean
@SessionScoped
public class MenubarManagedBean {

	private MenuModel menubar = new DefaultMenuModel();

	public MenubarManagedBean(){
		// Crea sottomenù richiesti
		DefaultSubMenu file = new DefaultSubMenu("File");
		DefaultSubMenu open = new DefaultSubMenu("Open");
		DefaultSubMenu help = new DefaultSubMenu("Help");

		// Crea voci di menu richieste
		DefaultMenuItem edit = new DefaultMenuItem("Edit");
		DefaultMenuItem exit = new DefaultMenuItem("Exit");

		// Crea voci di menu richieste
		DefaultMenuItem ajaxAction = new DefaultMenuItem("Ajax Action");
		ajaxAction.setUpdate("message");
		ajaxAction.setCommand("#{menubarManagedBean.ajaxAction}");

		DefaultMenuItem nonAjaxAction = new DefaultMenuItem("Non Ajax Action");
		nonAjaxAction.setAjax(false);
		nonAjaxAction.setCommand("#{menubarManagedBean.nonAjaxAction}");

		DefaultMenuItem urlAction = new DefaultMenuItem("Go To JournalDev");
		urlAction.setUrl("https://www.journaldev.com");

		DefaultMenuItem about = new DefaultMenuItem("About JournalDev");
		DefaultMenuItem contactUs = new DefaultMenuItem("Contact Us");
		DefaultMenuItem helpMenuItem = new DefaultMenuItem("Help");

		// Associa voci di menu con sottomenu aperto
		open.addElement(ajaxAction);
		open.addElement(nonAjaxAction);
		open.addElement(urlAction);

		// Associa voci di menu con sottomenu di aiuto
		help.addElement(about);
		help.addElement(contactUs);
		help.addElement(new DefaultSeparator());
		help.addElement(helpMenuItem);

		// Associa sottomenu aperto con sottomenu file
		file.addElement(open);
		file.addElement(edit);
		file.addElement(new DefaultSeparator());
		file.addElement(exit);

		// Associa sottomenù con il menù
		this.menubar.addElement(file);
		this.menubar.addElement(help);

	}

	public MenuModel getMenubar() {
		return menubar;
	}

	public void setMenubar(MenuModel menubar) {
		this.menubar = menubar;
	}

	public String ajaxAction(){
		FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Ajax Update"));
		return "";
	}

	public String nonAjaxAction(){
		return "";
	}
}

MenuButton Primefaces – Informazioni di Base

Il MenuButton visualizza diverse opzioni in un menu a comparsa.

Tag menuButton
Component Class org.primefaces.component.menubutton.MenuButton
Component Type org.primefaces.component.MenuButton
Component Family org.primefaces.component
Renderer Type org.primefaces.component.MenuButtonRenderer
Renderer Class org.primefaces.component.menubutton.MenuButtonRenderer

MenuButton Primefaces – Attributi

Name Default Type Description
id null String Unique identifier of the component.
rendered true Boolean Boolean value to specify the rendering of the component, when set to false component will not be rendered.
binding null Object An el expression that maps to a server side UIComponent instance in a backing bean.
value null String Label of the button
style null String Style of the main container element
styleClass null String Style class of the main container element
widgetVar null String Name of the client side widget
model null MenuModel MenuModel instance to create menus programmatically
disabled false Boolean Disables or enables the button.
iconPos left String Position of the icon, valid values are left and right.
appendTo null String Appends the overlay to the element defined by search expression. Defaults to document body.

Primefaces MenuButton – Iniziare

MenuButton consiste in uno o più voci di menu. Le voci di menu che verranno definite hanno le stesse somiglianze di quelle già utilizzate in precedenza, Ajax, azioni non-ajax e di navigazione sono supportate anche qui. index9.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form style="width:400px;">
	<p:growl id="message"></p:growl>
	<p:menuButton value="MenuButton">
		<p:menuitem value="Ajax Action" action="#{menuButtonManagedBean.ajaxAction}" update="message"></p:menuitem>
		<p:menuitem value="Non Ajax Action" action="#{menuButtonManagedBean.nonAjaxAction}" ajax="false"></p:menuitem>
		<p:menuitem value="Go To JournalDev" url="https://www.journaldev.com"></p:menuitem>
	</p:menuButton>
</h:form>
</html>

MenuButtonManagedBean.java

package com.journaldev.prime.faces.beans;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

import org.primefaces.model.menu.DefaultMenuItem;
import org.primefaces.model.menu.DefaultMenuModel;
import org.primefaces.model.menu.DefaultSeparator;
import org.primefaces.model.menu.DefaultSubMenu;
import org.primefaces.model.menu.MenuModel;

@ManagedBean(name="menuButtonManagedBean")
@SessionScoped
public class MenuButtonManagedBean {
	private MenuModel menuButton = new DefaultMenuModel();

	public MenuButtonManagedBean(){

	}

	public MenuModel getMenuButton() {
		return menuButton;
	}

	public void setMenuButton(MenuModel menuButton) {
		this.menuButton = menuButton;
	}

	public String ajaxAction(){
		FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Ajax Update"));
		return "";
	}

	public String nonAjaxAction(){
		return "";
	}
}

Primefaces MenuButton – Menu Dinamici

MenuButton può essere creato anche programmatically. Lo stesso esempio di MenuButton fornito nella sezione precedente è stato effettivamente implementato di seguito utilizzando la metodologia programmatica. index10.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form style="width:400px;">
	<p:growl id="message"></p:growl>
	<p:menuButton value="MenuButton" model="#{menuButtonManagedBean.menuButton}">
	</p:menuButton>
</h:form>
</html>

MenuButtonManagedBean.java

package com.journaldev.prime.faces.beans;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

import org.primefaces.model.menu.DefaultMenuItem;
import org.primefaces.model.menu.DefaultMenuModel;
import org.primefaces.model.menu.MenuModel;

@ManagedBean(name="menuButtonManagedBean")
@SessionScoped
public class MenuButtonManagedBean {
	private MenuModel menuButton = new DefaultMenuModel();

	public MenuButtonManagedBean(){

		// Creare le voci di menu necessarie
		DefaultMenuItem ajaxAction = new DefaultMenuItem("Ajax Action");
		ajaxAction.setUpdate("message");
		ajaxAction.setCommand("#{menubarManagedBean.ajaxAction}");

		DefaultMenuItem nonAjaxAction = new DefaultMenuItem("Non Ajax Action");
		nonAjaxAction.setAjax(false);
		nonAjaxAction.setCommand("#{menubarManagedBean.nonAjaxAction}");

		DefaultMenuItem urlAction = new DefaultMenuItem("Go To JournalDev");
		urlAction.setUrl("https://www.journaldev.com");

		this.menuButton.addElement(ajaxAction);
		this.menuButton.addElement(nonAjaxAction);
		this.menuButton.addElement(urlAction);

	}

	public MenuModel getMenuButton() {
		return menuButton;
	}

	public void setMenuButton(MenuModel menuButton) {
		this.menuButton = menuButton;
	}

	public String ajaxAction(){
		FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Ajax Update"));
		return "";
	}

	public String nonAjaxAction(){
		return "";
	}
}

Primefaces TieredMenu – Informazioni di Base

TieredMenu viene utilizzato per visualizzare sottomenu nidificati con sovrapposizioni.

Tag TieredMenu
Component Class org.primefaces.component.tieredmenu.TieredMenu
Component Type org.primefaces.component.TieredMenu
Component Family org.primefaces.component
Renderer Type org.primefaces.component.TieredMenuRenderer
Renderer Class org.primefaces.component.tieredmenu.TieredMenuRenderer

Primefaces TieredMenu – Attributi

Name Default Type Description
id null String Unique identifier of the component
rendered true Boolean Boolean value to specify the rendering of the component, when set to false component will not be rendered.
binding null Object An el expression that maps to a server side UIComponent instance in a backing bean
widgetVar null String Name of the client side widget.
model null MenuModel MenuModel instance for programmatic menu.
style null String Inline style of the component.
styleClass null String Style class of the component.
autoDisplay true Boolean Defines whether the first level of submenus will be displayed on mouseover or not. When set to false, click event is required to display.
trigger null String Id of the component whose triggerEvent will show the dynamic positioned menu.
my null String Corner of menu to align with trigger element.
at null String Corner of trigger to align with menu element.
overlay false Boolean Defines positioning, when enabled menu is displayed with absolute position relative to the trigger. Default is false, meaning static positioning.
triggerEvent click String Event name of trigger that will show the dynamic positioned menu.

Primefaces TieredMenu – Per Iniziare

TieredMenu è composto da sottomenu e voci di menu, i sottomenu possono essere nidificati e ogni sottomenu nidificato verrà visualizzato in una sovrapposizione. Le voci di menu che vengono coinvolte nel componente p:tieredMenu sono mirate per azioni Ajax, non-Ajax e di navigazione come tutte queste voci di menu utilizzate precedentemente. L’esempio seguente mostra il modo più semplice e applicabile per utilizzare p:tieredMenu che contiene un insieme di azioni miste. index11.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form style="width:400px;">
	<p:growl id="message"></p:growl>
	<p:tieredMenu>
		<p:submenu label="Ajax Menuitem">
			<p:menuitem value="Ajax Action" action="#{tieredMenuManagedBean.ajaxAction}" update="message"></p:menuitem>
		</p:submenu>
		<p:submenu label="Non Ajax Menuitem">
			<p:menuitem value="Non Ajax Action" action="#{tieredMenuManagedBean.nonAjaxAction}"></p:menuitem>
		</p:submenu>
		<p:separator/>
		<p:submenu label="Navigations">
			<p:submenu label="Primefaces links">
				<p:menuitem value="Prime" url="https://www.prime.com.tr"></p:menuitem>
				<p:menuitem value="Primefaces" url="https://www.primefaces.org"></p:menuitem>
			</p:submenu>
			<p:submenu label="Prime Blogs">
				<p:menuitem value="JournalDev" url="https://www.journaldev.com"></p:menuitem>
			</p:submenu>
		</p:submenu>
	</p:tieredMenu>
</h:form>
</html>

TieredMenuManagedBean.java

package com.journaldev.prime.faces.beans;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

@ManagedBean
@SessionScoped
public class TieredMenuManagedBean {
	public String ajaxAction(){
		FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Ajax Update"));
		return "";
	}

	public String nonAjaxAction(){
		return "";
	}
}

Primefaces TieredMenu – AutoDisplay

Per impostazione predefinita, i sottomenu vengono visualizzati quando il mouse è sopra gli elementi del menu principale, impostare autoDisplay su false richiede un clic sugli elementi del menu principale per abilitare la modalità di visualizzazione automatica. Lo stesso esempio verrà utilizzato per impostare autoDisplay su false contro il componente p:tieredMenu.

Primefaces TieredMenu – Sovrapposizione

Allo stesso modo del componente Menu, anche TieredMenu può essere sovrapposto utilizzando lo stesso metodo utilizzato per la sovrapposizione del componente Menu (Vedere Sovrapposizione Menu). index11.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
</h:head>
<h:form style="width:400px;">
	<p:growl id="message"></p:growl>
	<p:tieredMenu autoDisplay="false" trigger="triggerBtn" overlay="true" my="left top" at="right top">
		<p:submenu label="Ajax Menuitem">
			<p:menuitem value="Ajax Action" action="#{tieredMenuManagedBean.ajaxAction}" update="message"></p:menuitem>
		</p:submenu>
		<p:submenu label="Non Ajax Menuitem">
			<p:menuitem value="Non Ajax Action" action="#{tieredMenuManagedBean.nonAjaxAction}"></p:menuitem>
		</p:submenu>
		<p:separator/>
		<p:submenu label="Navigations">
			<p:submenu label="Primefaces links">
				<p:menuitem value="Prime" url="https://www.prime.com.tr"></p:menuitem>
				<p:menuitem value="Primefaces" url="https://www.primefaces.org"></p:menuitem>
			</p:submenu>
			<p:submenu label="Prime Blogs">
				<p:menuitem value="JournalDev" url="https://www.journaldev.com"></p:menuitem>
			</p:submenu>
		</p:submenu>
	</p:tieredMenu>
	<p:commandButton value="Show Menu" id="triggerBtn"></p:commandButton>
</h:form>
</html>

Primefaces TieredMenu – API lato client

È anche possibile controllare il componente TieredMenu utilizzando l’API lato client di Primefaces.

Method Params Return Type Description
show() – void Shows overlay menu.
hide() – void Hides overlay menu.
align() – void Aligns overlay menu with trigger.

index11.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
	<script>
		function showMenu(){
			PF('tieredMenu').show();
		}
		function hideMenu(){
			PF('tieredMenu').hide();
		}
	</script>
</h:head>
<h:form style="width:400px;">
	<p:growl id="message"></p:growl>
	<p:tieredMenu autoDisplay="false" trigger="triggerBtn" overlay="true" my="left top" at="right top" widgetVar="tieredMenu">
		<p:submenu label="Ajax Menuitem">
			<p:menuitem value="Ajax Action" action="#{tieredMenuManagedBean.ajaxAction}" update="message"></p:menuitem>
		</p:submenu>
		<p:submenu label="Non Ajax Menuitem">
			<p:menuitem value="Non Ajax Action" action="#{tieredMenuManagedBean.nonAjaxAction}"></p:menuitem>
		</p:submenu>
		<p:separator/>
		<p:submenu label="Navigations">
			<p:submenu label="Primefaces links">
				<p:menuitem value="Prime" url="https://www.prime.com.tr"></p:menuitem>
				<p:menuitem value="Primefaces" url="https://www.primefaces.org"></p:menuitem>
			</p:submenu>
			<p:submenu label="Prime Blogs">
				<p:menuitem value="JournalDev" url="https://www.journaldev.com"></p:menuitem>
			</p:submenu>
		</p:submenu>
	</p:tieredMenu>
	<p:commandButton value="Show Menu - Normal Trigger" id="triggerBtn"></p:commandButton>
	<p:commandButton value="Show Menu - JavaScript function" onclick="showMenu()"></p:commandButton>
	<p:commandButton value="Hide Menu - JavaScript function" onclick="hideMenu()"></p:commandButton>
</h:form>
</html>

Primefaces SlideMenu – Informazioni di base

SlideMenu viene utilizzato per visualizzare sottomenu nidificati con animazione di scorrimento.

Tag slideMenu
Component Class org.primefaces.component.slidemenu.SlideMenu
Component Type org.primefaces.component.SlideMenu
Component Family org.primefaces.component
Renderer Type org.primefaces.component.SlideMenuRenderer
Renderer Class org.primefaces.component.slidemenu.SlideMenuRenderer

Primefaces Slide Menu – Attributi

Name Default Type Description
id null String Unique identifier of the component
rendered true Boolean Boolean value to specify the rendering of the component, when set to false component will not be rendered.
binding null Object An el expression that maps to a server side UIComponent instance in a backing bean
widgetVar null String Name of the client side widget.
model null MenuModel MenuModel instance for programmatic menu.
style null String Inline style of the component.
styleClass null String Style class of the component.
backLabel Back String Text for back link.
trigger null String Id of the component whose triggerEvent will show the dynamic positioned menu.
my null String Corner of menu to align with trigger element.
at null String Corner of trigger to align with menu element.
overlay false Boolean Defines positioning, when enabled menu is displayed with absolute position relative to the trigger. Default is false, meaning static positioning.
triggerEvent click String Event name of trigger that will show the dynamic positioned menu.

Primefaces Slide Menu – Introduzione – Sovrapposizione e API lato client

SlideMenu è composto da sottomenu e voci di menu, i sottomenu possono essere nidificati e ogni sottomenu nidificato verrà visualizzato con un’animazione di scorrimento. Le funzionalità di SlideMenu sono simili a quelle definite nel TieredMenu discusse nella sezione precedente. index12.xhtml

<html xmlns="https://www.w3.org/1999/xhtml"
	xmlns:ui="https://java.sun.com/jsf/facelets"
	xmlns:h="https://java.sun.com/jsf/html"
	xmlns:f="https://java.sun.com/jsf/core"
	xmlns:p="https://primefaces.org/ui">
<h:head>
	<script name="jquery/jquery.js" library="primefaces"></script>
	<script>
		function showMenu(){
			PF('tieredMenu').show();
		}
		function hideMenu(){
			PF('tieredMenu').hide();
		}
	</script>
</h:head>
<h:form style="width:400px;">
	<p:growl id="message"></p:growl>
	<p:slideMenu autoDisplay="false" trigger="triggerBtn" overlay="true" my="left top" at="right top" widgetVar="tieredMenu">
		<p:submenu label="Ajax Menuitem">
			<p:menuitem value="Ajax Action" action="#{slideMenuManagedBean.ajaxAction}" update="message"></p:menuitem>
		</p:submenu>
		<p:submenu label="Non Ajax Menuitem">
			<p:menuitem value="Non Ajax Action" action="#{slideMenuManagedBean.nonAjaxAction}"></p:menuitem>
		</p:submenu>
		<p:separator/>
		<p:submenu label="Navigations">
			<p:submenu label="Primefaces links">
				<p:menuitem value="Prime" url="https://www.prime.com.tr"></p:menuitem>
				<p:menuitem value="Primefaces" url="https://www.primefaces.org"></p:menuitem>
			</p:submenu>
			<p:submenu label="Prime Blogs">
				<p:menuitem value="JournalDev" url="https://www.journaldev.com"></p:menuitem>
			</p:submenu>
		</p:submenu>
	</p:slideMenu>
	<p:commandButton value="Show Menu - Normal Trigger" id="triggerBtn"></p:commandButton>
	<p:commandButton value="Show Menu - JavaScript function" onclick="showMenu()"></p:commandButton>
	<p:commandButton value="Hide Menu - JavaScript function" onclick="hideMenu()"></p:commandButton>
</h:form>
</html>

SlideMenuManagedBean.java

package com.journaldev.prime.faces.beans;

import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;

@ManagedBean
@SessionScoped
public class SlideMenuManagedBean {
	public String ajaxAction(){
		FacesContext.getCurrentInstance().addMessage(null, new FacesMessage("Ajax Update"));
		return "";
	}

	public String nonAjaxAction(){
		return "";
	}
}

Riassunto

PrimeFaces ti fornisce una vasta gamma di componenti di menu dell’interfaccia utente di PrimeFaces, che mettono lo sviluppatore di fronte a una collezione interessante da cui l’utente può selezionare. Questo tutorial ha lo scopo di chiarire parte di questi tipi di menu. Contribuisci con noi commentando di seguito e trova il codice sorgente per questo tutorial.

Scarica il progetto del menu PrimeFaces

Source:
https://www.digitalocean.com/community/tutorials/primefaces-menu-menubar-menubutton-tieredmenu-slidemenu-example