仅当支持bean在会话作用域上时，JSF页面才加载数据

Question

This is my admin_order_search.xhtml page and it has a <p:dataTable> and I'm trying to call a admin_view_order.xhtml page with the particulate order object

<p:column>
   <f:facet name="header">
     <h:outputText value="View" />
   </f:facet>

   <p:commandButton action="admin_view_order?faces-redirect=true" id="view" value="View Info" update="dataTable" actionListener="#{viewOrderController.loadOrder(order)}" />

</p:column>

and this is my "admin_view_order.xhtml"

<h:form id="orderViewForm">
    <p:growl id="growl" showDetail="true" autoUpdate="true" sticky="false" />           

    <p:outputLabel value="#{viewOrderController.order.orderId}"></p:outputLabel>
    <p:outputLabel value="#{viewOrderController.order.customerName}"> </p:outputLabel>

</h:form>

and hear is my "ViewOrderController.java" page

@Component
@ManagedBean
@ViewScoped
public class ViewOrderController implements Serializable{
    private static final long serialVersionUID = 1L;
    private Order order;

    public void loadOrder(Order order){
        System.out.println("ID : "+order.getOrderId());
        System.out.println("Name : "+order.getCustomerName());
        this.order = order;
    }

    public Order getOrder() {
        return order;
    }

    public void setOrder(Order order) {
        this.order = order;
    }
}

the problem is admin_view_order.xhtml shows the order details, only if my ViewOrderController is on @SessionScoped but I want it to be on ViewScoped

Please let me knows how to do that?

Answer 1

Why do you want the Controller to be ViewScoped?

After leaving the view (navigate to admin_view_order.xhtml) a new instance of your controller is used. So the changes you made before (setting the order in loadOrder) are gone.

Answer 2

There is another way to do that , is to passing parameter through the GET request ( for example you can pass the id of the order object in admin_order_search.xhtml to , and then recover this id and use it in your backing bean by searching the object with this id ).

This is possible by using view parameters

1-pass the id of the object (add the folowing tag inside your button )

<f:param name="id" value="#{viewOrderController.order.orderId}" /> 

2-After that, in your admin_view_order.xhtml page, catch the view param and load the info for that order:

<f:metadata>
    <f:viewParam name="id" value="#{viewOrderController.newOrderId}" />
    <f:event type="preRenderView" listener="#{viewOrderController.loadOrder}"/>
</f:metadata>

note that i added an attribut ( newOrderId ) to put the order.orderId into it