Vue determines whether to close the page

Vue is a popular JavaScript framework for building modern, interactive user interfaces. In business development, we often need to determine whether the user has closed the page and handle it accordingly. This article will introduce how to use Vue to implement the function of determining whether to close the page.

1. The beforeunload event in Vue

The beforeunload event is triggered before the page is about to be unloaded, usually when the web page is closed or refreshed. We can perform related operations by listening to this event.

In Vue, we can use window.addEventListener() in the component to add a beforeunload event listener. As shown below:

mounted() {
  window.addEventListener('beforeunload', e => {
    // 在此处添加相关代码
  })
}

In the beforeunload event, we can perform some processing that needs to be performed immediately, such as sending some requests to the server, saving data, etc. It should be noted that since the beforeunload event will be called multiple times during the window closing process, we need to avoid performing the same operation multiple times.

2. Use Vue Router to judge page jumps

In addition to the beforeunload event, we can also use Vue Router to judge page jumps. Vue Router is Vue's official routing management plug-in, which can help us implement SPA (Single Page Application).

Vue Router provides a global navigation guard mechanism that can perform related operations during route switching. These include beforeRouteLeave, which is triggered before leaving the current route.

In Vue Router, we can add the beforeRouteLeave navigation guard through the router.beforeRouteLeave() method. As shown below:

beforeRouteLeave(to, from, next) {
  // 在此处添加相关代码
}

Among them, to and from are routing objects that represent the route to be jumped and the current route, and next is a method used to control route jumps. In beforeRouteLeave, we can perform some processing that needs to be performed immediately, such as sending some requests to the server, saving data, etc. It should be noted that in beforeRouteLeave, we must call the next method to implement the route jump.

3. Enhancing the implementation of user experience

In addition to the two methods introduced above, we can also use some techniques to enhance user experience. For example, when the page is closed or refreshed, a prompt box pops up for the user to confirm. Here, we can use the window.onbeforeunload event and combine it with Vue's v-on instruction to achieve it.

<template>
  <div>
    <button v-on:click="leavePage">离开页面</button>
  </div>
</template>

<script>
export default {
  methods: {
    leavePage() {
      window.onbeforeunload = () => {
        return "确定离开本页面吗？"
      }
      window.location.href = "https://www.example.com"
    }
  }
}
</script>

In the above code, we added a method to leave the page in the button click event. At the same time, a prompt was returned in the method through the window.onbeforeunload event listener to let the user confirm whether to leave the page. page.

Summary

This article introduces several methods to determine whether the page is closed in Vue, including using the beforeunload event, using the beforeRouteLeave navigation guard of Vue Router, and the implementation of enhancing the user experience. In business development, we can choose the appropriate method according to specific needs to realize the judgment of page closing. At the same time, it should be noted that when performing some operations that need to be performed immediately, we need to avoid performing the same operation multiple times to avoid data loss or other problems.

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