How to solve Vue page refresh problem

How to deal with page refresh problems encountered in Vue development

In Vue development, page refresh is a common problem. When we use the Vue framework to develop single-page applications, we often encounter data loss or page status loss after the page is refreshed. This usually happens when the user refreshes or reopens the page. In order to solve this problem, we need to adopt different methods for different situations. This article will introduce some common page refresh problems and provide some solutions.

1. Data Cache

In Vue development, we usually use Vuex to manage the state of the application. But when the page is refreshed, the data in Vuex will be cleared, causing the page status to be lost.

Solution:
Use the browser's local storage to save Vuex data. Every time Vuex data is modified, the data is saved to local storage at the same time. After the page is refreshed, the data is read from the local storage and the page status is restored.

For example, we can add a step to save data to local storage in Vuex's mutation:

import { saveState } from 'utils/localStorage'

const mutations = {
  updateData(state, newData) {
    state.data = newData
    saveState(state.data) // 将数据保存到本地存储
  }
}

Then, when the page loads, read the data from local storage:

import { loadState } from 'utils/localStorage'

const state = {
  data: loadState() // 从本地存储中读取数据
}

In this way, the page status can be maintained without losing it after the page is refreshed.

2. Routing status

In Vue development, we use Vue Router to manage navigation between pages. However, when the page is refreshed, the routing status will also be lost, causing the page to fail to display correctly.

Solution:
Use Vue Router's lazy loading mode and set the route's keep-alive attribute. In this way, Vue Router will automatically maintain the page status after the page is refreshed.

The specific method is to set the component to lazy loading mode when defining the route, and add the keep-alive attribute:

const router = new VueRouter({
  routes: [
    {
      path: '/home',
      name: 'Home',
      component: () => import(/* webpackChunkName: "home" */ '../views/Home.vue'),
      meta: {
        keepAlive: true // 添加 keep-alive 属性
      }
    }
  ]
})

Then, in App.vue Use the 7c9485ff8c3cba5ae9343ed63c2dc3f7 tag to wrap the page:

<template>
  <div id="app">
    <keep-alive>
      <router-view/>
    </keep-alive>
  </div>
</template>

In this way, the routing status of the page can be maintained after the page is refreshed.

3. Login status

In some applications, users need to log in to access certain pages. However, when the page is refreshed, the login status will be lost, causing the user to need to log in again.

Solution:
Use the browser's local storage to save the user's login status. After the user successfully logs in, save the login status to local storage. On each page load, the login status is read from local storage and the page's access permissions are set based on the status.

For example, when the user logs in successfully, save the login status to local storage:

localStorage.setItem('isLogged', true)

Then, in the routing navigation guard, determine the user's login status and jump to the page according to the situation. :

router.beforeEach((to, from, next) => {
  const isLogged = localStorage.getItem('isLogged')
  if (to.meta.requiresAuth && !isLogged) {
    next('/login') // 未登录状态下访问需要登录的页面，跳转至登录页面
  } else {
    next()
  }
})

In this way, the user's login status can be maintained after the page is refreshed.

Summary:

Page refresh problems often occur in Vue development, but through appropriate processing methods, we can avoid problems such as data loss, page status loss, and login status loss. This article introduces solutions such as using local storage to cache data, using Vue Router's keep-alive attribute to maintain routing status, and using local storage to save login status. I hope these methods can help developers who encounter page refresh problems during Vue development.

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