f:setPropertyActionListener未设置值，但是触发了操作 [英] f:setPropertyActionListener doesn't set the value however action is triggered

问题描述

无论何时切换p:fieldset，我都需要设置一个布尔字段.我尝试了以下代码，但是尽管p:ajax侦听器在切换时被调用，但f:setPropertyActionListener从未设置该字段.我尝试了以下代码.

I need to set a boolean field whenever p:fieldset is toggled. I tried out following code but the field is never set by f:setPropertyActionListener although p:ajax listener is invoked on toggle. I tried out following code.

    <p:fieldset legend="(Optional) Link.." toggleable="true">
        <p:ajax event="toggle" listener="..">
            <f:setPropertyActionListener target="#{viewScope.rendrUsrProjctsList}" value="#{true}"/>
        </p:ajax>
    </p:fieldset>

但是，当我尝试如下修改代码时，则成功设置了字段:

However when I tried modifying the code as below then field is successfully set:

    <p:fieldset legend="(Optional) Link.." toggleable="true">
        <p:ajax event="toggle" listener="#{view.viewMap.put('rendrUsrProjctsList', true)}" />
        <p:ajax event="toggle" listener=".."/>
        </p:ajax>
    </p:fieldset>

我想问:

1. 为什么第一种方法不起作用?
2. 是否将多个p:ajax附加到 单亲父母是否以第二种方式完成了?

1. Why 1st way doesn't work ?
2. Is it bad attaching multiple p:ajax to single parent as done in 2nd way ?

推荐答案

ActionListener 实现仅在实现 ActionSource 接口，例如 UICommand ，即<h:commandXxx>，<p:commandXxx>等.<p:ajax>没有实现此接口，因此<f:setPropertyActionListener>基本上被完全忽略.

The <f:setPropertyActionListener> works as being an ActionListener implementation only on components implementing ActionSource interface, such as UICommand, i.e. <h:commandXxx>, <p:commandXxx>, etc. The <p:ajax> does not implement this interface and therefore the <f:setPropertyActionListener> is basically completely ignored.

关于您的解决方法，您可以这样做，尽管我宁愿只使用具体的视图作用域bean或将其包装在具有支持组件的复合材料中.

As to your workaround, you could do so although I'd rather just use a concrete view scoped bean or wrap it in a composite with a backing component.

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