问题
Is there a way to call a method upon leaving a page with JSF?
回答1:
Not when using native JSF or PrimeFaces. Your best bet would be to hook on session expiration instead.
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. This will call the @PreDestroy when leaving the page referencing the view scoped bean.
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()).
See also:
- How detect and remove (during a session) unused @ViewScoped beans that can't be garbage collected
回答2:
If you use omnifaces @ViewScoped annotation in the backing bean the bean object is destroyed when you leave the view; so you can call a function when this happens using the @PreDestroy annotation in it.
Note: You must use omnifaces @ViewScoped annotation; with standard JSF @ViewScoped annotation the object isn't destroyed just by leaving the view, so pay attention to the import!
Source: http://showcase.omnifaces.org/cdi/ViewScoped
回答3:
Your problem Solution :- it work with java script
<head>
<title>onunload test</title>
<script type="text/javascript">
window.onunload = unloadPage;
function unloadPage()
{
alert("unload event detected!");
}
</script>
</head>
Also Some link for more details:- Link
回答4:
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.
<body onunload="leavingPage()">
<a4j:jsFunction name="leavingPage" action="#{myBean.myMethod}"/>
来源：https://stackoverflow.com/questions/9983904/is-there-a-way-to-call-a-method-upon-leaving-a-page-with-jsf-or-primefaces