更改侦听器而不提交表单

问题描述：

我有一个列表框，我想捕捉选择的变化，以便根据它填充另一个.我已经尝试过以下方式:

I've got a list box and I want to catch change in selection in order to fill an other one according to it. I've tried in the following way:

<h:selectOneMenu id="comunitaValle" value="#{struttura.nomeComunitaDiValle}" 
     onchange="submit()" valueChangeListener="#{struttura.getComuniInComunita}">
<f:selectItems value="#{struttura.comunitaValleList}" />
</h:selectOneMenu>

工作正常，但是在此页面中还有其他参数标记为

It works fine, but the fact that in this page there are other parameters marked as

required="true"

当提交表单时，我收到我的错误消息，说明已设置这些字段.我该如何避免提交整个表单，以免发生这种情况，并且仍然在2个列表框中具有正确的行为?

and when the form is submitted I get my error messages controlling that those field has been set. How can I avoid to submit the entire form to avoid this to happen and still have the correct behaviour on the 2 list boxes?

根据 https://*，我已经找到了一种解决方案(不知道这是否是最好的解决方案) .com/a/4802483/2492962 :

<h:selectOneMenu id="comunitaValle" value="#{struttura.nomeComunitaDiValle}" 
      valueChangeListener="#{struttura.getComuniInComunita}" immediate="true">
<a4j:support event="onchange" reRender="cap"/>
<f:selectItems value="#{struttura.comunitaValleList}" />
</h:selectOneMenu>

可以吗? JBoss显示警告消息:

Can it be fine? JBoss shows a warning message:

INFO  [lifecycle] WARNING: FacesMessage(s) have been enqueued, but may not have been displayed.

但是刷新似乎很好.

答

根据

更改侦听器而不提交表单

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