How to use Vue Router to implement data preprocessing before page jump?

How to use Vue Router to implement data preprocessing before page jump?

Introduction:
When using Vue to develop single-page applications, we often use Vue Router to manage jumps between pages. Sometimes, we need to preprocess some data before jumping, such as obtaining data from the server, or verifying user permissions, etc. This article will introduce how to use Vue Router to implement data preprocessing before page jump.

1. Install and configure Vue Router
First, we need to install Vue Router. Run the following command in the command line:

npm install vue-router --save

In the entry file of the project (such as main.js), you need to introduce Vue Router and configure routing:

import Vue from 'vue'
import VueRouter from 'vue-router'

Vue.use(VueRouter)

const routes = [
  // 定义路由
]

const router = new VueRouter({
  routes
})

new Vue({
  router,
  render: h => h(App)
}).$mount('#app')

2. Use Vue Router’s beforeEach Hook
Vue Router provides a global hook function named beforeEach, which performs specific operations before each route jump. We can perform data preprocessing in this hook function.

The following is an example, assuming that we need to get data from the server before jumping to a certain page:

router.beforeEach((to, from, next) => {
  // 在这里进行数据预处理的操作
  fetchDataFromServer(to.path)
    .then(data => {
      // 将数据保存到Vue实例或者Vuex中
      store.commit('setData', data)
      next()
    })
    .catch(error => {
      console.error('数据获取失败', error)
      next(false) // 停止路由跳转
    })
})

In the above code, the fetchDataFromServer function is a return The asynchronous function of Promise object, which can be used to send requests to the server and obtain data. After the data is successfully obtained, we save the data to the Vue instance or Vuex for use in the target page. If the data acquisition fails, we can stop the routing jump by next(false).

3. Unregister the hook function
After we complete the preprocessing of the data, we also need to unregister the hook function to avoid affecting the jump of other pages. When the Vue instance is destroyed, we need to remove the hook function from the Vue Router:

const unregisterHook = router.beforeEach((to, from, next) => {
  // 钩子函数的具体操作
})

new Vue({
  router,
  beforeDestroy() {
    unregisterHook() // 注销钩子函数
  },
  render: h => h(App)
}).$mount('#app')

In the above code, the unregisterHook function returns a cancellation function, which we can save In a Vue instance, the hook function can be unregistered by calling this function when the Vue instance is destroyed.

Summary:
It is very simple to use Vue Router to implement data preprocessing before page jump. We only need to use the beforeEach hook function to obtain and process data before jumping, and then save the data to the Vue instance or Vuex. At the same time, we need to log out the hook function when the Vue instance is destroyed to ensure that it does not affect the jump of other pages. In this way, we can control page jumps more flexibly and perform necessary data preprocessing operations.

Code example:

import Vue from 'vue'
import VueRouter from 'vue-router'

Vue.use(VueRouter)

const fetchDataFromServer = async (path) => {
  // 向服务器发送请求并获取数据的逻辑
}

const routes = [
  // 定义路由
]

const router = new VueRouter({
  routes
})

const unregisterHook = router.beforeEach((to, from, next) => {
  fetchDataFromServer(to.path)
    .then(data => {
      // 将数据保存到Vue实例或者Vuex中
      store.commit('setData', data)
      next()
    })
    .catch(error => {
      console.error('数据获取失败', error)
      next(false) // 停止路由跳转
    })
})

new Vue({
  router,
  beforeDestroy() {
    unregisterHook() // 注销钩子函数
  },
  render: h => h(App)
}).$mount('#app')

The above is the method and sample code for using Vue Router to implement data preprocessing before page jump. By using the beforeEach hook function, we can perform data preprocessing operations before routing jumps, thereby better controlling the page jump process. I hope this article will be helpful to you when developing single-page applications using Vue Router.

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