JSF更新复合组件(Primefaces) [英] JSF Updating Composite Component (Primefaces)

问题描述

我有以下UI Primefaces代码段:

I have the following UI Primefaces snippet:

<pou:growl id="growl" 
               redisplay="false"
               showDetail="false" 
               sticky="false" />

当我尝试更新此项时，例如:

When I try to update this item, for example like this:

<pou:commandButton value="Update" 
                   update=":growl"/>

一切正常.

但是，当我将咆哮声移至复合组件并尝试调用它时(例如，这样):

When I move growl to a composite component however and try to call it (ie. like this):

<ez:growl/>

我得到一个错误消息，内容为:

I get an error maessage that says:

javax.faces.FacesException: Cannot find component with identifier ":growl" referenced from "j_idt84:j_idt85:testForm:j_idt111".

我的问题是，为什么要添加所有这些自动生成的名称?如何控制它们，以便实际上可以访问要更新的组件?

My question is why are all these auto generated names being added and how can I control them so I can actually access the components to update?

推荐答案

这是因为复合组件固有地从

It's because composite components inherently extend from UINamingContainer (like as <h:form>, <h:dataTable>, etc) and thus prepend the client ID of their children with own ID.

要满足您的特定功能要求，请首先为复合组件指定一个固定ID:

To achieve your particular functional requirement, first give your composite component a fixed ID:

<ez:growl id="growl"/>

然后将<p:growl>嵌入到复合组件的实现中的普通HTML容器元素(如<div>或<span>)中，并将复合组件的客户端ID作为元素ID:

Then embed the <p:growl> in the composite component's implementation in a plain HTML container element like <div> or <span> with the composite component's client ID as element ID:

<cc:implementation>
    <span id="#{cc.clientId}">
        <p:growl />
    </span>
</cc:implementation>

现在，您可以按常规方式使用update=":growl".

Now you can just use update=":growl" the usual way.

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