如何使用 PrimeFaces 将 pe:badge 添加到 bean 中动态创建的菜单

Question

I'm rewriting static menu to dynamic, since our customer wants to dynamically change the menu on the fly. Before that I had standard <p:menu> <p:menuItem> </p:menu> structure in my xhtml.

But now I have changed it to: <p:menu model="#{pageTemplateView.menuModel}"/>

And I'm creating model in my backing bean like this:

DefaultMenuItem menuItem = new DefaultMenuItem();
menuItem.setIcon(item.getIcon());
menuItem.setTarget(item.getLink());
menuItem.setValue(item.getName());

But the problem is I don't know how to add <pe:badge> component inside menu item from bean.

Before that I included badges to menus the following way:

<p:menuitem id="tasks_icon_menuitem_id" icon="fa fa-tasks" url="#">
  <pe:badge content="#{badgeCountBean.badgeCount()}"/>
</p:menuitem> 

So how do I add <pe:badge> to dynamically created menu in bean?

I'm using PrimeFaces 8

Answer 1

After few hours of testing and plying around I found the issue that prevents me from adding badge to default menu item. The issue is when you try to add child to DefaultManuItem like this:

Badge badge = new Badge();
DefaultMenuItem defaultMenuItem = new DefaultMenuItem();
defaultMenuItem.getChildren().add(badge);

You get unsupported operation exception since DefaultMenuItem:: getChildren() is implemented like this:

public List<UIComponent> getChildren() {
    return Collections.emptyList();
}

But I have found an ugly workaround for this issue. So I might share it and maybe well get to better solution eventuality. In my xhtml I added empty menu and gave it fixed ID like this:

<!-- MENU PLACEHOLDER -->
<p:menu id="dynamic_menu_placeholder"/>

<!-- need to add dummy badge to xhtml otherwise it wont be displayed -->
<pe:badge/>

And then in my bean I got the component by ID and added UIMenuItem elements to it like this:

// get component by ID
UIComponent component = FacesContext.getCurrentInstance().getViewRoot().findComponent(":form:dynamic_menu_placeholder");
Menu menu = (Menu) component;
menu.getChildren().clear();

for (MenuItem item : menuItemList) {

    // creating menu item
    UIMenuItem menuItem = new UIMenuItem();
    menuItem.setUrl(item.getLink());
    menuItem.setValue(item.getValue());
    menuItem.setId(... generated some id);
    
    // creating badge
    Badge badge = new Badge();
    badge.setContent(...getBadgeCount()..);
    
    // adding badge to menu item
    menuItem.getChildren().add(badge);
}

// addin menu item to menu
menu.getChildren().add(menuItem);