java - 使用ajax更新另一个字段

Question

查看:

<h:form id="ExamrequisitionsCreateForm">

     <p:selectOneMenu id="examId" value="#{examrequisitionsController.selected.examId}" required="true" requiredMessage="#{bundle.EditExamrequisitionsRequiredMessage_examId}">
          <f:selectItems value="#{examsController.itemsAvailableSelectOne}"
                    var="examIdItem"
                    itemValue="#{examIdItem}"/>
          <f:ajax execute="@this" listener="#{examrequisitionsController.getPriceExam(examItem.id)}" render="ExamrequisitionsCreateForm:price" />
</p:selectOneMenu>

          <p:inputText id="price" value="#{examrequisitionsController.selected.price}" title="#{bundle.CreateExamrequisitionsTitle_price}" required="true" requiredMessage="#{bundle.CreateExamrequisitionsRequiredMessage_price}">

</h:form>

Controller :

public BigDecimal getPriceExam(int id) {
    EntityManager em = Persistence.createEntityManagerFactory("SystemCardiologyReportsPU").createEntityManager();
     List<Exams> examsList = em.createNamedQuery("Exams.findById").
                 setParameter("id", id).getResultList();
     return examsList == null ? null : examsList.get(0).getPrice();
}

我正在尝试在考试中执行事件change后更新字段price。 我怎样才能做到这一点？

Answer 1

请尝试以下操作:

1. 删除

      <f:ajax execute="@this" listener="#{examrequisitionsController.getPriceExam(examItem.id)}" render="ExamrequisitionsCreateForm:price" />
   

并添加

  <p:ajax  listener="#{examrequisitionsController.updatePrice}" update="price"/>

在您的 Controller 中:

   public void updatePrice (){
        EntityManager em = Persistence.createEntityManagerFactory("SystemCardiologyReportsPU").createEntityManager();
   List<Exams> examsList = em.createNamedQuery("Exams.findById").
         setParameter("id", this.selected.examId ).getResultList();
   this.selected.price == null ? null : examsList.get(0).getPrice();
}

您的监听器只需要更新绑定(bind)到输入文本的值，并且您的 ajax 调用只需要更新它。