Question

我正在使用Primefaces的计划组件。我用数据库中的值填充它，当用户从selectonemenu中选择某个时间时，会触发ajax事件（我试图只输入相关代码，如果有缺失请提醒我）：

XHTML：

 <h:outputText value="Scope :" />
 <h:selectOneMenu id="scope" value="#{scheduleView.scope}">                    
   <f:selectItems value="#{lookup.scopeCombo}"/>
   <p:ajax process="scope" update="schedule, scheduleForm, scheduleFormPG" listener="#{scheduleView.changeScopeType()}"/>
 </h:selectOneMenu> 

<p:schedule id="schedule" value="#{scheduleView.model}" editable="true"/>

支持bean：

@ManagedBean
@ViewScoped
public class ScheduleView implements Serializable { 

@PostConstruct
    public void init() {
        System.out.println("Init ");
        scopeChange();                
    } 

    public void scopeChange(String scope){
        System.out.println("scopeChange ");
        model.clear();
        events = (List<Event>) commonServis.bringEverythingByCriteria(Event.class, "scope" , scope);   
        for(int i= 0; i<events.size();i++){
        model.addEvent(new DefaultScheduleEvent(events.get(i).getAd(), events.get(i).getStartDate(),events.get(i).getEndDate()));
    }

    public void changeScopeType() {
    System.out.println("changeScopeType ");
        scopeChange (scope);
}

上述代码的输出是：

Init
scopeChange

当用户更改selectonemenu中的值时：

changeScopeType
Init
scopeChange

应该只进入init方法一次。但是在触发changeScopeType函数后，它会进入init方法并使用不相关的数据填充计划。我认为它可能与@Postconstruct注释有关，但我找不到任何相关的解释。谁能理解原因并提供解决方案？

以下是整页：

<?xml version='1.0' encoding='UTF-8' ?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<ui:composition 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://prime.primefaces.org/ui"
                template="templates/layout.xhtml"
                xmlns:c="http://java.sun.com/jsp/jstl/core">
    <ui:define name="title">#{labels.schedule}</ui:define>
    <ui:define name="content">
        <h:form id="scheduleForm">
            <h:panelGrid id="scheduleFormPG">
                <p:growl id="msgs" />
                <p:dialog modal="true" widgetVar="statusDialog" header="Status" draggable="false">
                    <h:graphicImage value="resources/images/ajax-loader.gif" />
                </p:dialog>
                <p:dialog showEffect="explode" hideEffect="explode" resizable="false"
                      header="warning" widgetVar="confirmationErase" appendToBody="true" modal="true">
                    <h:outputText value="Are you sure?"/>
                    <br/>
                    <p:commandButton  value="Yes" actionListener="#{scheduleView.deleteEvent(AE)}"
                                     update="msgs, scheduleFormPG, schedule, wrapperPanel"
                                     onstart="statusDialog.show(),confirmationErase.hide()"
                                     oncomplete="statusDialog.hide(), eventDialog.hide()" process="@parent, scope" />
                    <p:commandButton value="No" onclick="confirmationErase.hide()" type="button" />
                </p:dialog>                
                <h:outputText value="scope :" />
                <h:selectOneMenu id="scope" value="#{scheduleView.scope}">                    
                    <f:selectItems value="#{lookup.scopeTypeCombo}"/>
                    <p:ajax process="scope" update="schedule, scheduleForm, scheduleFormPG" listener="#{scheduleView.changeScopeType()}"/>
                </h:selectOneMenu>                
             </h:panelGrid>            
            <p:schedule onDateSelectUpdate="wrapperPanel" 
                        onEventSelectUpdate="wrapperPanel" onEventSelectComplete="eventDialog.show()" eventSelectListener="#{scheduleView.onEventSelect}" 
                        onDateSelectComplete="eventDialog.show();"  dateSelectListener="#{scheduleView.onDateSelect}" id="schedule" value="#{scheduleView.model}" editable="true"/>
            <p:dialog id="dialog111" widgetVar="eventDialog" header="Event Information" showEffect="clip" hideEffect="clip">
                <p:panel id="wrapperPanel">                    
                    <h:panelGrid id="eventDetails" columns="2">   
                        <h:outputLabel for="eventName" value="Event Name *: " />
                        <p:inputText id="eventName" value="#{scheduleView.event.title}" required="true"/>
                        <h:outputLabel value="Start Date:" />
                        <p:calendar id="sKalender" value="#{scheduleView.event.startDate}">
                            <f:convertDateTime pattern="dd/MM/yyyy" />  
                        </p:calendar>
                        <h:outputLabel value="End Date:" />
                        <p:calendar id="eKalender" value="#{scheduleView.event.endDate}">
                            <f:convertDateTime pattern="dd/MM/yyyy" />  
                        </p:calendar>
                        <h:outputLabel value="All Day:" />
                        <h:selectBooleanCheckbox id="allDay" value="#{scheduleView.event.allDay}" />
                        <h:outputLabel value="scope: " />
                        <h:selectOneMenu id="scopeChoice" value="#{scheduleView.event.scope}">                    
                            <f:selectItems value="#{lookup.scopeTypeCombo}"/>
                         </h:selectOneMenu>                         
                          <p:commandButton onclick="confirmationErase.show()" oncomplete="eventDialog.hide()" update="wrapperPanel, msgs, schedule" type="reset" value="Delete" />
                        <p:commandButton value="Save" actionListener="#{scheduleView.addEvent(AE)}" process="@parent, scope" update="schedule wrapperPanel msgs scheduleForm" oncomplete="eventDialog.hide();"/>
                    </h:panelGrid>
                </p:panel>
            </p:dialog>
           </h:form>
    </ui:define>
</ui:composition>

Answer 1

问题在于这行代码：

<p:ajax process="scope" update="schedule, scheduleForm, scheduleFormPG" listener="#{scheduleView.changeScopeType()}"/>

更新刷新整个页面，而不应该只更新计划。当我将其更改为：

update="schedule"

问题解决了。谢谢大家的努力。

Init方法在@Viewscoped bean中被调用两次

1 个答案: