我目前有一个表面DataTable，editMode设置为单元格。当我为给定的单元格输入一个新值时，它不想获得我刚刚输入的最新值，而是继续返回现有的（旧值）
例如，如果旧值为7，并且我将其编辑为3，则event.getNewValue（）将返回7而不是3。
这是我的xhtml文件：
<?xml version="1.0" encoding="UTF-8"?>
<!--
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To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:h="http://java.sun.com/jsf/html"
xmlns:f="http://java.sun.com/jsf/core"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:p="http://primefaces.org/ui">
<h:head>
<title>Admin</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
</h:head>
<body>
<ui:composition template="template.xhtml">
<ui:define name="content">
<div id="header">
<div id="logo">
<h:form>
<h:link outcome="adminHome">
<h:graphicImage value="resources/img/logo.png" alt="Monash South Africa - A campus of Monash Univeristy Australia"/>
</h:link>
</h:form>
</div>
<ul>
<h:form>
<li>Help</li>
<li><h:link value="Logout" outcome="login"></h:link></li>
</h:form>
</ul>
</div>
<h:form id="adminHome">
<p:menubar>
<p:menuitem value="Home" icon="ui-icon-home" url="faces/userHome.xhtml" style="margin-left: 0px !important; margin-right: 0px !important;"/>
<p:menuitem value="View Applications" icon="ui-icon-document" url="faces/userHome.xhtml" style="margin-left: 0px !important; margin-right: 0px !important;"/>
<p:submenu label="Manage" icon="ui-icon-document" style="margin-left: 0px !important; margin-right: 0px !important;">
<p:menuitem value="GPA Grants" url="#" style="padding-left: 0% !important; margin-left: 0% !important;"/>
<p:menuitem value="Achievement Levels" url="#" style="padding-left: 0% !important; margin-left: 0% !important;"/>
<p:menuitem value="Marks" url="#" style="padding-left: 0% !important; margin-left: 0% !important;"/>
</p:submenu>
</p:menubar>
<p:messages id="messages" showDetail="true" autoUpdate="true" closable="true" />
<h3>List of Applications</h3>
<p:dataTable id="appDT" value="#{applicationFacade.applications}" var="item" resizableColumns="true" liveResize="true" selection="#{applicationFacade.appList}" rowKey="#{item.applicationid}" paginator="true" rows="50" rowsPerPageTemplate="50,100,150" editable="true" editMode="cell">
<p:ajax event="cellEdit" listener="#{applicationFacade.onCellEdit}" update="appDT"/>
<p:column selectionMode="multiple" style="width:16px;text-align:center"/>
<p:column>
<f:facet name="header">
<h:outputText value="Studentid"/>
</f:facet>
<h:outputText value="#{item.studentid}"/>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Email"/>
</f:facet>
<h:outputText value="#{item.email}"/>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Coursecode"/>
</f:facet>
<h:outputText value="#{item.coursecode}"/>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Levelofstudy"/>
</f:facet>
<h:outputText value="#{item.levelofstudy}"/>
</p:column>
<p:column headerText="AL">
<p:cellEditor>
<f:facet name="output"><h:outputText value="#{item.al}"/></f:facet>
<f:facet name="input"><p:inputText value="#{item.al}"/></f:facet>
</p:cellEditor>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="GPA"/>
</f:facet>
<h:outputText value="#{item.gpa}"/>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="AVG"/>
</f:facet>
<h:outputText value="#{item.average}"/>
</p:column>
<p:column>
<f:facet name="header">
<h:outputText value="Approvalcount"/>
</f:facet>
<h:outputText value="#{item.approvalcount}"/>
</p:column>
<f:facet name="footer">
<p:commandButton action="#{applicationFacade.approveApplication()}" icon="ui-icon-check" value="Approve" update="appDT"/>
<p:commandButton action="#{applicationFacade.rejectApplication()}" icon="ui-icon-closethick" value="Reject" update="appDT"/>
</f:facet>
</p:dataTable>
</h:form>
</ui:define>
</ui:composition>
</body>
</html>
这是我的豆子
package DataAccess;
import Entities.Application;
import java.util.List;
import javax.ejb.Stateless;
import javax.faces.application.FacesMessage;
import javax.faces.context.FacesContext;
import javax.inject.Named;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import org.primefaces.event.CellEditEvent;
@Stateless
@Named(value = "applicationFacade")
public class ApplicationFacade extends AbstractFacade<Application> {
@PersistenceContext(unitName = "com.mycompany_WSAMS_war_1.0-SNAPSHOTPU")
private EntityManager em;
private List<Application> appList;
private List<Application> removeList;
private Application appRef;
private Application appRef1;
private int approvalCounter;
@Override
protected EntityManager getEntityManager() {
return em;
}
public ApplicationFacade() {
super(Application.class);
}
public List<Application> getAppList() {
return appList;
}
public void setAppList(List<Application> appList) {
this.appList = appList;
}
// ----------------------------------------------------------------------------Business------------------------------------------------------------------
public List<Application> getApplications() {
return em.createNamedQuery("Application.findAll").getResultList();
}
public void approveApplication() {
for (Application each : appList) {
approvalCounter = each.getApprovalcount();
approvalCounter++;
if (approvalCounter > 6) {
infoSix();
} else {
each.setApprovalcount(approvalCounter);
appRef = em.merge(each);
em.persist(appRef);
}
}
}
public void rejectApplication() {
for (Application each : appList) {
approvalCounter = each.getApprovalcount();
if (approvalCounter == 0) {
infoZero();
} else {
approvalCounter--;
each.setApprovalcount(approvalCounter);
appRef = em.merge(each);
em.persist(appRef);
}
}
}
public void createApplication() {
for (Application each : appList) {
em.persist(each);
}
}
public void deleteApplication() {
for (Application each : appList) {
appRef = em.merge(each);
em.remove(appRef);
}
}
public void infoSix() {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Info", "This Application Already Has 6 Approvals"));
}
public void infoZero() {
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Info", "This Application Is Already at 0 Approvals"));
}
public void onCellEdit(CellEditEvent event) {
Object AL = event.getNewValue();
Object ALO = event.getOldValue();
//appRef1 = appList.get(0);
//appRef1.setAl(AL);
//appRef = em.merge(appRef1);
//em.persist(appRef);
FacesContext.getCurrentInstance().addMessage(null, new FacesMessage(FacesMessage.SEVERITY_INFO, "Info", "Application Successfully Changed"+AL+ALO));
}
/*public void createApplication(Application appRef){
em.persist(appRef);
} */
}
我希望有人遇到同样的问题并知道解决方案
答案 0 :(得分：1)
在我看来，你的bean需要一个范围才能正常工作。 如您的代码所示，它将具有对JSF没有帮助的依赖范围。