在离开带有JSF或PrimeFaces的页面时，是否可以调用方法？
[英]Is there a way to call a method upon leaving a page with JSF or PrimeFaces?
问题描述
是否可以在离开JSF页面后调用方法？
4 个解决方案
解决方案1
6 已采纳 2012-04-03 02:44:55
Not when using native JSF or PrimeFaces. 
使用本地JSF或PrimeFaces时不可以。 Your best bet would be to hook on session expiration instead. 最好的选择是代替会话过期。
import javax.inject.Named;
import javax.enterprise.context.SessionScoped;
@Named
@SessionScoped
public class Bean implements Serializable {
@PreDestroy
public void destroy() {
// Your code here.
}
}
If you happen to use the JSF utility library OmniFaces , then you can use its @ViewScoped . 如果碰巧使用了JSF实用程序库OmniFaces ，则可以使用其@ViewScoped 。 This will call the @PreDestroy when leaving the page referencing the view scoped bean. 当离开引用视图范围的bean的页面时，这将调用@PreDestroy 。
import javax.inject.Named;
import org.omnifaces.cdi.ViewScoped;
@Named
@ViewScoped
public class Bean implements Serializable {
@PreDestroy
public void destroy() {
// Your code here.
}
}
Under the covers , it works by triggering a navigator.sendBeacon() during the window beforeunload event with a fallback to synchronous XHR (which is deprecated in modern browsers supporting navigator.sendBeacon() ). 在 beforeunload ，它通过在窗口beforeunload事件期间触发navigator.sendBeacon()工作，并回beforeunload同步XHR（在支持navigator.sendBeacon()现代浏览器中已弃用）。
See also: 也可以看看：
解决方案2
3
If you use omnifaces @ViewScoped annotation in the backing bean the bean object is destroyed when you leave the view; 如果在后备bean中使用omnifaces @ViewScoped批注，则离开视图时，该bean对象将被破坏； so you can call a function when this happens using the @PreDestroy annotation in it. 因此，当发生这种情况时，您可以使用其中的@PreDestroy批注来调用该函数。
Note : You must use omnifaces @ViewScoped annotation;
Source: http://showcase.omnifaces.org/cdi/ViewScoped
解决方案3
2 2012-04-04 04:48:15
Your problem Solution :- it work with java script 您的问题解决方案：-它与Java脚本一起使用
<head>
<title>onunload test</title>
<script type="text/javascript">
window.onunload = unloadPage;
function unloadPage()
{
alert("unload event detected!");
}
</script>
</head>
解决方案4
0 2012-04-03 08:27:43
You can call a JSF managed bean method when you are closing the page or navigating to another page by using a <a4j:jsFunction/> and calling it at ' onunload ' event of the page body as below. 当您关闭页面或导航到另一个页面时，可以使用<a4j:jsFunction/>并在页面正文的' onunload '事件中调用它来调用JSF托管bean方法，如下所示。
<body onunload="leavingPage()">
<a4j:jsFunction name="leavingPage" action="#{myBean.myMethod}"/>
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