如何使用 @HostListener('window:beforeunload') 调用方法?

问题描述

我正在尝试调用我在卸载组件之前自己创建的 post 方法，但它不起作用.

I am trying to call a post method I made myself before my component is unloaded, but it doesn't work.

我在@HostListener 上设置了一个断点，当我打开不同的组件时它不会在那里中断.

I put a breakpoint on @HostListener and it doesn't break there when I open a different component.

我正在使用 Chrome 进行调试，并为卸载和卸载前打开了事件侦听器断点，当我打开不同的组件时会中断.

I'm using Chrome to debug and I turned on Event Listener Breakpoints for unload and beforeunload, which do break when I open a different component.

我的代码中是否遗漏了什么?

Am I missing something in my code?

import { Component, OnInit, HostListener } from '@angular/core';

Component({
    templateUrl: 'new-component.html'    
})

export class NewComponent implements OnInit {
    @HostListener('window:beforeunload') onBeforeUnload() {
            PostCall();
    }
}

推荐答案

window:beforeunload 是在实际卸载页面之前触发的浏览器事件.

window:beforeunload is a browser event which is triggered right before actually unloading the page.

当您导航到另一个组件时，实际上并不是在卸载页面.

When you navigate to another component, you are not actually unloading the page.

你需要做的是使用 ngOnDestroy ，它会在组件被销毁时被调用.实现如下接口:

What you need to do is use ngOnDestroy which will be called when component is being destroyed. Implements the following interface:

https://angular.io/api/core/OnDestroy

示例:

export class NewComponent implements OnDestroy{
    ngOnDestroy() {
            PostCall();
    }
}

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