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Is there a way to call a method upon leaving a page with JSF or PrimeFaces?
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Solved jsfprimefacesmanaged-beanwindow.onunload
G

4

10

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

Gasperoni answered 2/4, 2012 at 21:13 Comment(2)
Incidentally, this is mentioned in the JSF 2.2 JSR: "Event system enhancements. For example, the ability to install a listener for page navigation events. This would enable the familiar dialog, "You have unsaved changes in this page, are you sure you want to discard them?" – Southland
Possibly the spec intends a server side navigation here, but that would be limiting since the user needs to use postbacks to navigate to a new page then. – Southland
B
7

Not when using native JSF or PrimeFaces. Your best bet would be to hook on session expiration instead.

import jakarta.inject.Named;
import jakarta.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 jakarta.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 or pagehide event with a fallback to synchronous XHR (which is deprecated in modern browsers supporting navigator.sendBeacon()).

See also:

Belleslettres answered 3/4, 2012 at 2:44 Comment(0)
U
3

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

Unruffled answered 22/12, 2017 at 8:5 Comment(0)
T
2

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

Tallyman answered 4/4, 2012 at 4:48 Comment(3)
The OP want to call a JSF backing bean method, not to show a simple alert. – Belleslettres
maybe you can programmatically click a hidden commandButton in the unload event to call a method in backing bean – Firenew
@Belleslettres I don't see OP has written he want to call baking bean method, he want simply to call method, or can't write... – Labyrinth
D
0

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}"/>
Daren answered 3/4, 2012 at 8:27 Comment(3)
Have you ever tried it yourself? It won't work. At least, not in normal webbrowsers. – Belleslettres
I dont know what are the "normal webbrowsers". But I have tried this before I put it here. Now again I tried it in Chrome, FF and IE. Have YOU tried this before commenting? – Daren
Then you had the luck to be inside a race condition everytime where ajax request has won from the browser close event. This is however not guaranteed to be successful everytime. For sure not in production where the server usually runs at a physically different machine and the network latency is thus higher. – Belleslettres

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