vue same route jump forced refresh

Vue is a very popular JavaScript framework for developing single-page applications (SPA). Vue Router is indispensable when developing single-page applications. Vue Router is the routing manager officially provided by Vue.js, allowing developers to easily define routes, views, and behaviors for handling navigation requests.

Vue Router does not reload the page content by default when jumping between the same route, but reads the previously loaded content from the cache. Although this method can improve performance, in some cases, developers need to force a page refresh, such as when the latest data needs to be displayed immediately after the page content is updated.

This article will introduce how to force refresh the same route in Vue.

Problem description

In Vue Router, if we jump between the same route, Vue will not re-render the component, which means that the component's life cycle hook function will not be Triggered again. This means that if we want the data in the component to stay in sync with the backend, we need to add update logic manually.

<template>
  <div>{{message}}</div>
</template>

<script>
export default {
  data() {
    return {
      message: ''
    }
  },
  mounted() {
    this.updateData()
  },
  methods: {
    updateData() {
      // 从后端请求最新数据
      this.message = 'Hello World'
    }
  }
}
</script>

In this example, we manually call the updateData function to update the message data to ensure that it is synchronized with the backend. While this approach can solve the problem, manually calling the update function each time a jump is made can become cumbersome, especially as the application becomes more complex.

Solution

Vue Router has a built-in global variable named $route, which contains the current routing information. We can detect route changes by tracking $route and force the component to be refreshed when the route changes.

We can register the $route listener in the component's created or mounted life cycle hook function, and then force refresh the page when $route changes.

<template>
  <div>{{message}}</div>
</template>

<script>
export default {
  data() {
    return {
      message: ''
    }
  },
  mounted() {
    this.updateData()
    this.$router.afterEach((to, from) => {
      if (to.path === from.path) {
        this.$nextTick(() => {
          location.reload()
        })
      }
    })
  },
  methods: {
    updateData() {
      // 从后端请求最新数据
      this.message = 'Hello World'
    }
  }
}
</script>

In this example, we registered the $route listener in the mounted life cycle hook and forced a refresh of the page when a route change was detected. We use to.path and from.path to compare whether the current route is the same as the previous route. If they are the same, it can be determined that the user is refreshing the current route. At this time, we can force the page to be refreshed through the location.reload() function.

It should be noted that we used Vue’s $nextTick() function before forcefully refreshing the page. This function can defer the callback function until after the DOM is updated to ensure that the data has been completely updated. If you do not use the $nextTick() function but directly force refresh the page, it may cause incomplete page rendering or delayed data update.

Summary

When developing Vue single-page applications, we often need to jump between the same routes. By default, Vue does not re-render components, which may cause page content to be out of sync with back-end data. By monitoring $route changes in Vue Router, we can detect jumps between the same routes and force the page to refresh when jumping, thereby solving the data out-of-sync problem.

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