Question

我使用的是PF 5.0和jsf 2.2.8，我的代码如下。

<ui:composition template="/template/mastertemplate.xhtml">
<ui:define name="content">
<f:view>
   <h:body>
    <h:form id="bcr_form_2" styleClass="form">
    <p:tabView id="bcrId_tabview">
    <p:tab title="Budget Cash Demands">
    <h:panelGrid>

<p:commandButton value="save" id="saveDemandId_cmdbutton"
action="#{budgetControlRegisterAction.saveNewDemand()}"
binding="#{budgetControlRegisterAction.myMessageCId}"
update=":#{p:component('saveId_message')}">
</p:commandButton>
<p:message id="saveId_message" for="saveDemandId_cmdbutton" ></p:message>

</h:panelGrid>
</h:form >
<!-- and all closing tags-->

BudgetControlRegisterAction.java类（@ResquestScoped）

    private UIComponent myMessageCId;
    // setter and getter 


    public String saveNewDemand() {
    FacesContext context = FacesContext.getCurrentInstance();
    log.info("client Id :" + myMessageCId.getClientId(context));
    //log output is -----> client Id :bcr_form_2:bcrId_tabview:saveDemandId_cmdbutton
    //id on browser is ------>  bcr_form_2:bcrId_tabview:saveDemandId_cmdbutton

/*this is not working */    
    //when i use myMessageCId.getClientId(context) nothing displayed on client side
    FacesContext.getCurrentInstance().addMessage(myMessageCId.getClientId(context),new FacesMessage(FacesMessage.SEVERITY_INFO, "some msg" , "some msg"));


/*this is working and displaying msg to client browser*/

    // but when i put hard coded component client Id (copied from web browser) e.g bcr_form_2:bcrId_tabview:saveDemandId_cmdbutton
    // see it is without leading colon (:)
    // and myMessageCId.getClientId(context) gives me id with colon(:) see log output in above lines
    FacesContext.getCurrentInstance().addMessage("bcr_form_2:bcrId_tabview:saveDemandId_cmdbutton",new FacesMessage(FacesMessage.SEVERITY_INFO, "some msg" , "some msg"));

    }

如何通过myMessageCId.getClientId（context）方法获取客户端ID（不带冒号）？

Answer 1

我刚试过你的代码（我评论了你的第二个addMessage，把@RequestScoped和删除composition），它在Primefaces 5.1和Mojarra 2.2.8上运行得很好！我注意到你的日志输出是：

client Id :bcr_form_2:bcrId_tabview:saveDemandId_cmdbutton

但要注意日志行代码：

log.info("client Id :" + myMessageCId.getClientId(context));

从字符串连接中引入了前导分号。所以真正的输出是：

bcr_form_2:bcrId_tabview:saveDemandId_cmdbutton

并且如上所述它起作用。

通过componentgetClientId（context）获取冒号的组件ID

1 个答案: