使用 Primefaces JavaScript 在服务器上的 bean 上调用 JSF 方法
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Using Primefaces JavaScript to call a JSF method on a bean on the server
提问by Mark Stang
In the Primefaces User Guide it shows examples of how to make AJAX calls to the server
在 Primefaces 用户指南中，它显示了如何对服务器进行 AJAX 调用的示例
PrimeFaces.ajax.AjaxRequest('/myapp/createUser.jsf',
{
formId: 'userForm',
oncomplete: function(xhr, status) {alert('Done');}
});
What I can't figure out is how to call a particular method. My goal is to invalidate the session from the client using JavaScript.
我想不通的是如何调用特定的方法。我的目标是使用 JavaScript 使来自客户端的会话无效。
回答by Danubian Sailor
RemoteCommandis a nice way to achieve that because it provides you a JavaScript function that does the stuff (calling backing bean, refreshing, submitting a form etc., everything that command link can do).
RemoteCommand是实现这一目标的好方法，因为它为您提供了一个 JavaScript 函数来执行这些操作（调用支持 bean、刷新、提交表单等，命令链接可以执行的所有操作）。
From PrimeFaces 3.4 documentation:
<p:remoteCommand name="increment" actionListener="#{counter.increment}"
out="count" />
<script type="text/javascript">
function customFunction() {
//your custom code
increment(); //makes a remote call
}
</script>
回答by wrschneider
What I've typically done is put a hidden p:commandLink on the page, then have Javascript call the click() event on it.
我通常所做的是在页面上放置一个隐藏的 p:commandLink，然后让 Javascript 在其上调用 click() 事件。
<p:commandLink id="hiddenLink"
actionListener="#{bean.methodToInvoke}" style="display:none"/>
Then
然后
$('#hiddenLink').click();
回答by BalusC
Do it in the @PostConstructmethod of the request scoped bean which is associated with the requsted JSF page by EL like #{bean}.
@PostConstruct在请求范围 bean的方法中执行此操作，该bean 与 EL 请求的 JSF 页面相关联，例如#{bean}。
@ManagedBean
@RequestScoped
public class Bean {
@PostConstruct
public void init() {
// Here.
}
}
Unrelated to the question, I only wonder why you would ever do it that way? JSF/PrimeFaces offers much nicer ways using <f:ajax>and <p:ajax>and consorts.
与问题无关，我只是想知道你为什么会那样做？JSF/PrimeFaces 提供了更好的使用<f:ajax>and<p:ajax>和 consorts 的方法。
Is it the intent to run this during Window's unloador beforeunloadevents? If so, then I have to warn you that this is not reliable. It's dependent on the browser whether such a request will actually reach the server or not. More than often it won't. Use it for pure statistical or premature cleanup purposes only, not for sensitive business purposes.
是否有意在 Windowunload或beforeunload事件期间运行它？如果是这样，那么我必须警告您，这是不可靠的。这种请求是否会真正到达服务器取决于浏览器。更多时候它不会。仅将其用于纯粹的统计或过早清理目的，而不是用于敏感的业务目的。
