Vue implements a method to prompt exit after saving

Below I will share with you a method for Vue to implement prompts to exit after saving. It has a good reference value and I hope it will be helpful to everyone.

Suppose there is such a requirement. The user edits text on a page, but does not click save and jumps to the next route. A better approach should be to give a prompt - "The content you edited has not been saved, are you sure to exit?" If the user clicks "OK", then the user will exit directly without saving the current content. If the user clicks "Cancel", the current session will be cancelled. This route jumps and continues to stay on the original page.

Tried and wrong approach

At the beginning, I thought about using vuex combined with vue router’s beforeEach navigation guard to implement it. The code is as follows:

First add a state value in vuex—introduceState

const store = new Vuex.Store({
 strict: true, // process.env.NODE_ENV !== 'production', 直接修改state 抛出异常
 state: {
  ....
  introduceState: false,
  ....
 },
 getters: {
  introduceState: state => state.currentMenus
 },
 mutations: {
  // 更新introduceState的值
  changeIntroduceState (state, value) {
   state.introduceState = value
  }
 }
})

When the user clicks to jump to another page The life cycle function beforeDestroy will be triggered. In this function, we can detect whether the user's edited content is saved, if it has not been saved yet.

If the content has not been saved, we will pop up a prompt box, and when the user chooses to cancel, update the introduceState value in vuex to true.

import { mapGetters, mapActions, mapMutations } from "vuex"
export default {
 data() {
  return {
   contentHasSave: false // 记录用户是否已经保存内容
  }
 },
 methods： {
  ...mapMutations({
   changeIntroduceState: changeIntroduceState
  })
 }，
 beforeDestory: function(){
  if(!contentHasSave){
   // 使用element的提示框
   this.$confirm('您还未保存简介，确定需要提出吗?', '提示', {
    confirmButtonText: '确定',
    cancelButtonText: '取消',
    type: 'warning'
   }).then(() => {
    // 选择确定，正常跳转
   })
   .catch(() => {
    // 选择取消
    this.changeIntroduceState(true)
   })
  }
 }
}

Finally, in the navigation guard of router's beforeEach, monitor all route jumps from the current page. When the introduceState of the state is true, use next(false) to cancel this routing jump

import Vue from "vue";
import VueRouter from "vue-router";
import routeConfig from "./routes";
import {sync} from "vuex-router-sync";
import store from "../store";
//加载路由中间件
Vue.use(VueRouter)
//定义路由
const router = new VueRouter({
 routes: routeConfig,
 //mode: 'history'
})
sync(store, router)
router.beforeEach((to, from, next) => {
 // 简介也未提交，取消跳转
 if(from.fullPath === '/adwords/introduce' && store.state.introduceState === 'not-save'){
  next(false)
 }
})
export default router

This approach actually does not work because beforeEach The execution of the method is actually executed before the method of component beforeDestory, which means that the value of introduceState is not updated to true at all when beforeEach is executed.

The correct approach

Later, I went through the official documentation of vue router and found a wonderful method, which is navigation within the component. guard.

const Foo = {
 template: `...`,
 beforeRouteEnter (to, from, next) {
  // 在渲染该组件的对应路由被 confirm 前调用
  // 不！能！获取组件实例 `this`
  // 因为当守卫执行前，组件实例还没被创建
 },
 beforeRouteUpdate (to, from, next) {
  // 在当前路由改变，但是该组件被复用时调用
  // 举例来说，对于一个带有动态参数的路径 /foo/:id，在 /foo/1 和 /foo/2 之间跳转的时候，
  // 由于会渲染同样的 Foo 组件，因此组件实例会被复用。而这个钩子就会在这个情况下被调用。
  // 可以访问组件实例 `this`
 },
 beforeRouteLeave (to, from, next) {
  // 导航离开该组件的对应路由时调用
  // 可以访问组件实例 `this`
 }
}

The above description is very clear, so I added a beforeRouteLeave method to the js code of the component, and then a prompt box popped up to prompt the user to exit after saving. Function.

export default {
 data() {
  return {
   contentHasSave: false // 记录用户是否已经保存内容
  }
 },
  // 组件内导航钩子，处理未保存退出的情况
 beforeRouteLeave: function(to, from , next){
  if(this.buttonText === '提交'){
   next(false)
   this.$confirm('您还未保存简介，确定需要提出吗?', '提示', {
    confirmButtonText: '确定',
    cancelButtonText: '取消',
    type: 'warning'
   }).then(() => {
    // 选择确定
    next()
   })
  }
 }
}

The effect is as follows:

The above is me I compiled it for everyone, I hope it will be helpful to everyone in the future.

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