Send a request before Vue closes the page

When building web applications with Vue.js, we often need to perform some operations to clean up the state or send some last requests. One of the scenarios is that when the user closes the page, we need to send a request to save the current state or perform some cleanup operations to ensure that the data is not lost.

In a traditional website, we can perform some operations in the window.onbeforeunload event. But in Vue.js, when we use Vue Router for page navigation, only Vue Router's navigation hook will be triggered when the page is closed, but the window.onbeforeunload event will not be triggered. So, how to send a request before closing the page?

In Vue.js, we can listen to route navigation by registering a global front guard. The global front guard is a function that is called before routing navigation and can accept three parameters: to (the target routing object that is about to enter), from (the routing object that the current navigation is about to leave), next (call this method to enter) next hook).

We can register a hook function in the global front guard. When the user leaves the current page, the hook function will be triggered. We can send the request in the hook function and perform the actions we need. The following is a sample code:

// main.js
import Vue from 'vue';
import App from './App';
import router from './router';

router.beforeEach((to, from, next) => {
  const answer = window.confirm("确定要关闭页面吗？");
  if (answer) {
    // 发送请求并执行清理操作
    // do something...
    next();
  } else {
    next(false);
  }
});

new Vue({
  el: '#app',
  router,
  render: h => h(App),
});

In the above code sample, we registered a global front guard and defined a hook function in it. This hook function will be triggered when the user is leaving the current page. We pop up a confirmation box in the hook function to ask the user if they are sure they want to close the page. If the user confirms that they want to close the page, send a request and perform cleanup operations; otherwise, cancel the navigation and stay on the current page.

It should be noted that we use the next() method in the hook function to enter the next hook. If we do not call the next() method, the navigation will be interrupted and stay on the current page.

To summarize, we can listen to the page closing event by registering a hook function in the global front guard of Vue Router. In the hook function we can send the request and perform the actions we need. This way we ensure that data is not lost when the user closes the page, while also performing some necessary cleanup operations.

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