是否可以在不按Enter键的情况下为p:inputText执行valueChangeListener? [英] Possible to execute `valueChangeListener` for `p:inputText` without hitting `enter` key?

问题描述

当用户更改文本并且inputText失去焦点(onchange)时，我想对p:inputText执行valueChangeListener.这可能吗?目前，它仅在按回车键后执行.

I'd like to execute valueChangeListener for p:inputText when user changes text and inputText looses focus (onchange). Is this possible? For now it only executed after I press return.

推荐答案

valueChangeListener方法需要调用表单提交.这是服务器端事件，而不是客户端事件等.默认情况下，仅更改和模糊输入不会完全提交表单.引入<p:ajax>做魔术.

The valueChangeListener method requires a form submit to be invoked. This is a server side event, not a client side event or so. Just changing and blurring the input does by default not submit the form at all. Bring in a <p:ajax> to do the magic.

<p:inputText value="#{bean.inputValue}" valueChangeListener="#{bean.inputChanged}">
    <p:ajax />
</p:inputText>

但是，尽管，您并没有告诉您要满足的具体功能要求认为这是正确的解决方案，我只想提及valueChangeListener通常不是您所想到的工作的错误工具.请使用<p:ajax listener>.

However, although you didn't tell anything about the concrete functional requirement for which you thought that this is the right solution, I just wanted to mention that the valueChangeListener is more than often the wrong tool for the job you had in mind. Use <p:ajax listener> instead.

<p:inputText value="#{bean.inputValue}">
    <p:ajax listener="#{bean.inputChanged}" />
</p:inputText>

请注意，这将使EL 2.2可以传递方法参数，这将立即回答

Note that this would then make it possible to pass method arguments by EL 2.2, which would immediately then answer the possible underlying functional requirement of your other — actually pretty poor — question.

<p:inputText value="#{bean.inputValue}">
    <p:ajax listener="#{bean.inputChanged('arg1', 'arg2')}" />
</p:inputText>

还请注意，如果您实际上对输入的值感兴趣，那么这可能根本不是解决方案.您可以直接访问inputValue属性.

Also note that this might not be the solution at all if you're actually interested on the entered value; you could just access the inputValue property directly.

• 何时使用valueChangeListener或f:ajax监听器?

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