如何将类别与 ManagedBean 和 xhtml 页面绑定

Question

I'm new to programming and I wanna ask: if I have a managedBean(with difference characteristics) and I want to add different categories, showing them on the xhtml page.. how can I bind those categories with managedBean and xhtml and put products in the right category after user add the product ?

here is a part of my xhtml code:

<ui:define name="content">
        <h2>New auction</h2>
        <h:form>
            <h:panelGrid columns="2">
                <h:outputLabel value="Name:" />
                <h:inputText value="#{newAuctionWizard.auction.name}" />

                <h:outputLabel value="Description:" />
                <h:inputTextarea value="#{newAuctionWizard.auction.description}" />

                <h:commandButton value="Cancel" action="#{newAuctionWizard.cancel()}" />    
                <h:commandButton value="Details" action="newAuctionDetails" />  
            </h:panelGrid>
            <h:messages style="color: red" />
        </h:form>
    </ui:define>

and part of the java code:

private static final long serialVersionUID = -38089703767395198L;

private Long id;
@Size(min=2, max=30, message = "The auction's name: minim {min} and maximum {max} caractere")
private String name;
@Size(max=1000, message = "The auction's description must be of maximum {max} characters")
private String description;
@Min(value = 1, message = "Original price should be at least 1 RON")
@NotNull(message = "Highest Bid")
private Long originalPrice;
private String location;

private User owner;
private Bid highestBid;

private List<Bid> bids = new ArrayList<Bid>();

I want the user to be able to choose a category and put its product in the right category when adding an auction.. for each category shall I make a Java class ?

Thank you

Answer 1

In this post i will try to answer about your question (even if it's not very clear for me)

in your category entity you will make the list of product that you will work with it will look like this

categoryEntity.java

@Entity
@EntityListeners(QuerySessionLog.class)
@Table(name = "category")

....
@OneToMany(mappedBy = "category",  fetch = FetchType.LAZY , cascade = CascadeType.ALL ,orphanRemoval = true)
private List<productEntity> listProducts ;

Don't forget the getter and setter of your list

and in your productEntity it will look like this

productEntity.java

...
@JoinColumn(name = "category")
@ManyToOne(fetch = FetchType.LAZY)
private categoryEntity category; 

one more time don't forget the getter and setter

and finnaly you can access to this data throw category.listProducts

to show your informations you can found various example in the primefaces web site primefaces web site for example dataTable ...

Hope that helped you.