JSF unable to modify facet

Question

I am trying to modify a facet in my .xhtml file programatically. I am using Primefaces 6.1.

I have the following code in .xhtml

<p:menubar model="#{menu.model}" id="myMenu">
    <f:facet name="options">

    </f:facet>
</p:menubar>

In my bean I have the following code to update "options" facet.

@PostConstruct
public void initMenu(){     
// getting data is skipped
    HtmlPanelGrid mainPanel = new HtmlPanelGrid();
    HtmlOutputLabel htmlOutputLabel = new HtmlOutputLabel();
    htmlOutputLabel.setValue("Search Template");
    mainPanel.getFacets().put("options",htmlOutputLabel);    
}

mainPanel.getFacets() returns no facets hence can't add the label.

How can I programmatically access and modify the facet? I am stumped.

Why should a newly (in a wrong way btw) created **panelgrid** return the facets of a non-related menubar??? — Kukeltje, Nov 18 '17 at 08:07

Dusan Kovacevic · Answer 1 · 2017-11-18T19:27:11.933

0

In order to getFacets() from menubar you need to get reference on instance of existing menubar.

You can achieve this by binding p:menubar to server side component instance.

In you managed bean add

private org.primefaces.component.menubar.Menubar menubar;

and add getter and setter.

Add binding attribute to p:menubar like this

<p:menubar model="#{menu.model}" id="myMenu" binding="#{menu.menubar}">
    <f:facet name="options">

    </f:facet>
</p:menubar>

Inside @PostConstruct method add

@PostConstruct
public void initMenu() {
    // getting data is skipped
    //initMenuModel();

    menubar=(Menubar)FacesContext.getCurrentInstance().getApplication().createComponent(Menubar.COMPONENT_TYPE);
    HtmlOutputText htmlOutputLabel = new HtmlOutputText();
    htmlOutputLabel.setValue("Search Template");
    Map<String, UIComponent> facets = menubar.getFacets();
    facets.put("options", htmlOutputLabel);
}

Also check recommendations and best practices regarding JSF 'binding' attribute.

edited Nov 18 '17 at 19:27

answered Nov 18 '17 at 09:00

Dusan Kovacevic

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Thanks for trying to answer. Sure thus works with the declaratively added menumodel? And it is not good practice to create components via 'new'. – Kukeltje Nov 18 '17 at 09:22
I've tested this solution with a case that user posted (no declarative data model). I agree its not best practice but I think there is no harm in this case. – Dusan Kovacevic Nov 18 '17 at 09:40
Sorry, I meant the reference to the menuModel was declared via an attribute, not a declarative menu structure. OP has that in his question. – Kukeltje Nov 18 '17 at 09:53
@Kukeltje, ok. Now I understand what you meant. Anyways, I've tested solution and it works as expected. – Dusan Kovacevic Nov 18 '17 at 18:03
Still, doing 'new MenuBar()' is not good practice... You should use the `FacesContext.getCurrentInstance().getApplication()` and create the component this way – Kukeltje Nov 18 '17 at 18:12
@Kukeltje, thank you for pointing that. I've updated my answer and also added additional resource for learning. – Dusan Kovacevic Nov 18 '17 at 19:29

JSF unable to modify facet

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