Java 如何使用 RichFaces a4j:commandButton 不使用提交
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How to use RichFaces a4j:commandButton not using submit
提问by volvox
I have an a4j:commandButtonwhich looks like this
我有一个a4j:commandButton看起来像这样
<a4j:commandButton id="stopBtn" type="button" reRender="lastOp"
action="#{MyBacking.stop}" value="Stop" />
</a4j:commandButton>
When the app is deployed, and the button clicked, the stop() method is not being called. All the a4j:commandButtonexamples refer to forms, but this button is not in a form - it's a button the user is going to use to cause the server to run some back-end logic. At the moment, the method is
部署应用程序并单击按钮时，不会调用 stop() 方法。所有a4j:commandButton示例都引用了表单，但此按钮不是在表单中 - 它是用户将用来使服务器运行某些后端逻辑的按钮。目前的方法是
public void stopNode() {
logger.info("STOPPING");
setLastOp("Stopped.");
}
Other methods which don't use this type of button are updating the lastOp field, but I'm not seeing anything on the console with this one. Am I right to cast this as a button? Should I put this in a h:formtag?
其他不使用此类按钮的方法正在更新 lastOp 字段，但我在控制台上没有看到任何带有此按钮的方法。我把它当作一个按钮是对的吗？我应该把它放在一个h:form标签中吗？
The firebug console says:
萤火虫控制台说：
this._form is null
which I don't understand.
我不明白。
Any help well appreciated.
任何帮助都非常感谢。
采纳答案by BalusC
UICommandcomponents ought to be placed inside an UIFormcomponent. So, your guess
UICommand组件应该放在UIForm组件内。所以，你的猜测
Should I put this in a
h:formtag?
我应该把它放在一个
h:form标签中吗？
is entirely correct :) This because they fire a POSTrequest and the only (normal) way for that is using a HTML <form>element whose methodattribute is set to "post". Firebug also says that a parent form element is been expected, but it resolved to nulland thus no actions can be taken place.
是完全正确的:)这是因为他们火了POST请求，并为使用HTML只（正常）的方法<form>元素，其method属性设置为"post"。Firebug 还表示需要父表单元素，但它已解决null，因此无法执行任何操作。
Only "plain vanilla" links like h:outputLinkand consorts doesn't need a form, because they just fires a GETrequest.
只有像h:outputLink和 consorts 这样的“普通”链接不需要表单，因为它们只是触发一个GET请求。
回答by Naganalf
Yes, wrap it in a form. I'm sure BalusC will post a detailed explanation while I'm typing my answer. (yup, there it is)
是的，把它包装成一个表格。我确定 BalusC 会在我输入答案时发布详细说明。（是的，它在那里）
I have to ask why you didn't just try a form first, before posting here.
我不得不问你为什么不先尝试一个表格，然后再在这里发帖。
回答by Max tay
Look at your code:
看看你的代码：
<a4j:commandButton id="stopBtn" type="button" reRender="lastOp" action="#{MyBacking.stop}" value="Stop" />
You finished <a4j:commandButtonwith />, why need that orphan </a4j:commandButton>?
你完成了<a4j:commandButton与/>，为什么需要一个孤儿</a4j:commandButton>？
回答by Max Katz
If for some reason you don't want to place the button inside a form, you can do something like this:
如果出于某种原因您不想将按钮放在表单中，您可以执行以下操作：
<a4j:commandButton onclick="fireAjax()"/>
<h:form>
<a4j:jsFunction name="fireAjax" action=".."/>
</h:form>
