p:ajax开火两次 [英] p:ajax fires twice

问题描述

关于PrimeFaces的p:ajax.我的<p:commandButton>中有两个p:ajax请求.我在第二种方法中做了stdout，所以我可以查看它是否被触发.相同(最后)的方法被触发两次，我不知道为什么.如果我仅在按钮中提出一个<p:ajax>请求，则他将触发一次；如果我提出两个<p:ajax>请求，则将其两次触发.

concerning p:ajax of PrimeFaces. I have two p:ajax requests within my <p:commandButton>. I did stdout within the second method so that I can see if its triggered or not. The same (last) method is triggered twice and I don't know why. If I put only one <p:ajax> request into my button he fires once and if I put two <p:ajax> requests he fires twice.

<h:body style="background:#f5f5f5;">
    <h:form id="formG">
        <p:commandButton styleClass="viewButton" icon="ui-icon-search"
            value="#{msg['button.open']}" id="auftragButtonG">

            <p:ajax listener="#{auftragBean.saveIdIntoAppScope()}"  partialSubmit="true"/>
            <p:ajax listener="#{auftragBean.loadXMLData()}" partialSubmit="true"/>
        </p:commandButton>
    </h:form>
</h:body>

public void loadXMLData(){
    setXmlData(entireXmlData(mandantId(), getJobId()));
    System.out.println(getXmlData().size());
}

任何人都知道为什么以及如何忽略第二个负担吗?

Anybody knows why and how I can ignore the second load?

推荐答案

这是因为您正在指示组件在同一(默认)事件上触发两个Ajax请求.一个<p:ajax>视为一个请求.换句话说，代码的行为与您编写的代码完全相同.

It's because you're instructing the component to fire two ajax requests on the same (default) event. One <p:ajax> counts as one request. In other words, the code is behaving exactly as you programmed it.

您需要以不同的方式解决您的具体问题.

You need to solve your concrete problem differently.

1. 调用一种方法，该方法又委派给所需的方法.

1. Invoke one method which in turn delegates to the desired methods.

<p:commandButton ... action="#{bean.methodWhichInvokesBothMethods()}" partialSubmit="true" />

在一个调用中调用多个方法.您可以使用<f:actionListener binding>技巧.

<p:commandButton ... partialSubmit="true">
    <f:actionListener binding="#{bean.method1()}" />
    <f:actionListener binding="#{bean.method2()}" />
</p:commandButton>

无论哪种方式，<p:ajax>都是完全不必要的，因为<p:commandButton>本身已经具有内置的ajax支持.

Either way, the <p:ajax> is totally unnecessary as the <p:commandButton> by itself already has builtin ajax support.

• action和actionListener之间的差异

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