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Is there a way to call a method upon leaving a page with JSF or PrimeFaces?

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感情败类
感情败类 2021-02-20 16:48

Is there a way to call a method upon leaving a page with JSF?

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  • 栀梦
    2021-02-20 17:00

    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
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  • 孤街浪徒
    2021-02-20 17:04

    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}"/>
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  • 你的背包
    2021-02-20 17:16

    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

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  • 感动是毒
    2021-02-20 17:17

    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

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