JSF ajax 命令按钮不更新 primefaces 选择列表
代码如下：
<h:form id="articleForm" >
<p:commandButton value="Select tags" ajax="true" >
<f:ajax execute="@form" render="@form :articleForm:tags" />
</p:commandButton>
<p:pickList id="tags" value="#{articleController.dualListModelForTags}" var="tag" itemLabel="#{tag.tag}" itemValue="#{tag}" converter="distinctTagConverter">
<f:facet name="sourceCaption">Distinct tags</f:facet>
<f:facet name="targetCaption">Connected tags</f:facet>
</p:pickList>
</h:form>
当单击命令按钮时，将调用并执行支持 bean 中的 getDualListModelForTags()。在 getDualListModelForTags() 中，我做了一些修改，因此我希望更新选项列表。但 picklist(id=tags) 不会再次呈现。仅当我刷新页面时，才会对选项列表进行修改。
This is the code:
<h:form id="articleForm" >
<p:commandButton value="Select tags" ajax="true" >
<f:ajax execute="@form" render="@form :articleForm:tags" />
</p:commandButton>
<p:pickList id="tags" value="#{articleController.dualListModelForTags}" var="tag" itemLabel="#{tag.tag}" itemValue="#{tag}" converter="distinctTagConverter">
<f:facet name="sourceCaption">Distinct tags</f:facet>
<f:facet name="targetCaption">Connected tags</f:facet>
</p:pickList>
</h:form>
When the commandbutton is clicked, the getDualListModelForTags() in the backing bean is called and executed. In getDualListModelForTags() I make some modifications so I want the picklist to be updated. But the picklist(id=tags) is not rendered again. Only when I refresh the page, are the modifications made to the picklist.
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评论（1）
PrimeFaces而不是 ，而不是
@form，所以你可以省略它。您应该使用@form覆盖的客户端 ID，因此只需@form就足够了。此外，ajax="true"属性也是不必要的，因为这已经是默认值。因此，这应该可以：
与具体问题无关，您正在 getter 方法中完成业务工作。这是一个坏主意。请改为在按钮的
action方法中执行此操作。您似乎还使用会话范围 bean 来查看范围数据。这是一个坏主意。而是将 bean 放入视图范围中。The PrimeFaces
<p:commandButton>component doesn't work together with<f:ajax>. You need to use the button's own ajax-targeted attributes instead. Instead of the<f:ajax execute>you should use<p:commandButton process>. But this already defaults to@form, so you can omit it. Instead of the<f:ajax render>you should use<p:commandButton update>. Specifying client IDs which are already covered by@formis unnecessary, so just@formis sufficient. Also theajax="true"attribute is unnecessary as that's the default already.So just this should do:
Unrelated to the concrete problem, you're doing the business job inside a getter method. This is a bad idea. Do it in the button's
actionmethod instead. You also seem to be using a session scoped bean for view scoped data. This is a bad idea. Put the bean in the view scope instead.