从代码中获取SelectOneMenu的选定项

Question

I'm trying to get a primefaces SelectOneMenu selected item's name from code:

This is my SelectOneMenu:

FacesContext.getCurrentInstance().getViewRoot().findComponent("formMain:somSelect");

The Component is found. I already tried to cast it into a SelectOneMenu but I won't get a method like "getSelectedValue()" which is written in the user manual in "client side api". I also tried:

FacesContext.getCurrentInstance().getViewRoot().findComponent("formMain:somSelect").getAttributes().get("label");

But this returns NPE.

<p:selectOneMenu id="somSelect" value="#{userManagerBean.somValue}" valueChangeListener="#{userManagerBean.somListener}" styleClass="selecters">
<f:selectItems value="#{userSelectBean.userList}" />
</p:selectOneMenu>

UserManagerBean.java

@ManagedBean
@RequestScoped
public class UserManagerBean {

    private String somValue;
    private String selectedUser;
    private List<User> userData;    
    private List<User> users;

    public UserManagerBean() {  

    }

    public String getSomValue(){
        return somValue;        
    }

    public void setSomValue(String somValue){
        this.somValue = somValue;
    }

    // Getter for Table Content
    public List<User> getUserData() {
        return userData;
    }

Any ideas?

€: The problem is that the selected item is only returned in the getter if I call a method and an ajax update:

<p:ajax update="panelMain" listener="#{userManagerBean.changeEvent}" />

But I don't get an correct selected item on page load ( item = null ).

Answer 1

As you are using list of beans to populate f:selectItems you should add converter or provide itemValue attribute. In your case as value is String provide itemValue with some String identifier of your User bean:

<f:selectItems value="#{userSelectBean.userList}" var="u" itemValue="#{u.code}" itemLabel="#{u.name}"/>

Change properties code and name to those which you have in your User bean. Be shore that itemValue points to String as your value in backing bean is String .