是否可以在离开带有JSF或PrimeFaces的页面时调用方法?

问题描述

在使用JSF离开页面时是否可以调用方法?

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

推荐答案

在使用本机JSF或PrimeFaces时不适用.最好的选择是代替会话过期.

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.
    }
}

如果碰巧使用了JSF实用程序库 OmniFaces ，则可以使用其 @ViewScoped .当离开引用视图作用域的bean的页面时，它将调用@PreDestroy.

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.
    }
}

在幕后，它通过触发在窗口beforeunload事件期间发生，并回退到同步XHR(支持navigator.sendBeacon() 的现代浏览器.

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()).

• 如何检测并删除(在会话期间)不能被垃圾收集的未使用的@ViewScoped bean

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