java - 无法获取 PrimeFaces p :rating value and save it into the Oracle database

Question

我想使用 p: rating 组件来投票并将该值保存到数据库中(如果它已经被投票为能够稍后从数据库中提取该值)。在实体中，我也有评论字段，我希望是否已经编写了评论以仅添加投票，所以我有时会进行合并而不是保留(如果数据库中没有写入此请求的任何内容)。我的 .xhtml 页面中有以下代码:

<h:form
        rendered="#{not empty userRequestBean.request.hiredAgency.city}">
        <p:rating value="#{userRequestBean.rating}" stars="10"
            onRate="#{userRequestBean.rateAgency()}">
        </p:rating>
    </h:form>

在我的 bean 中，我有:

@ManagedBean(name = "userRequestBean")
@SessionScoped
public class UserRequestBean implements Serializable {
    private Integer rating; // Plus get and set methods
    private TComment agencyComment = new TComment();
    public void rateAgency() {
        if (rating == null) return;
        EntityManager em = HibernateUtil.getEntityManager();
        if (!em.getTransaction().isActive())
            em.getTransaction().begin();
        Query queryAgencyComment = em.createQuery("select comment "
                + "from TRequest req join req.requestComments comment "
                + "where req.id = :requestId ");
        Long requestId = (Long) request.getId();
        queryAgencyComment.setParameter("requestId", requestId);
        agencyComment = (TComment) queryAgencyComment.getSingleResult();

        if (agencyComment.equals(null)) {
            agencyComment = new TComment();
            agencyComment.settRequest(request);
            agencyComment.setCommentDate(new Date());
            agencyComment.setAssessment(rating);
            em.persist(agencyComment);
            em.getTransaction().commit();
        } else {
            agencyComment.setAssessment(5);
            em.merge(agencyComment);
            em.getTransaction().commit();
        }
    }

但是onRate，rateAgency方法并没有被执行。它仅在页面呈现时执行一次。我该如何实现这项工作？

Answer 1

当您尝试运行服务器方法时，属性onRate 定义JavaScript(客户端)操作。您需要一个 ajax 操作:

<p:rating value="#{userRequestBean.rating}" stars="10" >
    <p:ajax event="rate" listener="#{userRequestBean.rateAgency()}" />
</p:rating>

有用的链接:

• PrimeFaces showcase
• 一个很好的 JSF 教程(例如 Oracle's Java EE 7 Tutorial )