Detailed explanation of Vue element plus multi-language switching

Preface
How to switch between multiple languages?

1. Install the vue-i18n package
2. Create a new one in the src directory as shown below:
3. In main.js
4. Use in vue file

How to switch language dynamically and change elementUI language?

1. Use vuex to write a method in mutations to change the element language
2. Use

After changing the elementUI component view, it is not updated?

1. Control view display/hide on router-view
2. Call reload when switching languages
3. You need to call commit in main.js, otherwise the language will not be changed when you enter elementUI for the first time

How to use $t function globally? How to use vue-i18n in js files?

You cannot use $t directly in router.js, you need to import this function yourself

Summarize

Preface

I recently took over a project that is used in multiple countries and needs to support multi-language switching, which I will record here.

Solve the following problems:

How to switch between multiple languages?
How to switch language dynamically and change elementUI language?
After changing the elementUI component view, it is not updated?
How to use $t function globally?
How to use vue-i18n in js files?

How to switch between multiple languages?

1. Install the vue-i18n package

npm i vue-i18n --save

2. Create a new one in the src directory as shown below:

insert image description here

en.js

const EN = {
  login: {
    title: 'User Login'
  },
}
export default EN

pl-pl.js

const PL_PL = {
  login: {
    title: 'I'm a very good person'
  },
}
export default PL_PL

zh-cn.js

const ZH_CN = {
  login: {
    title: 'User login'
  },
}
export default ZH_CN

index.js

import { createI18n } from 'vue-i18n/index'
import 'dayjs/locale/zh-cn'
import zh from './zh-cn'
import en from './en'
import pl from './pl-pl'
const messages = {
  'zh-cn': zh,
  'en': en,
  'pl': pl
}
// Gets the current locale
export function getLanguage() {
  // Use the language of choice 
  const chooselang = localStorage.getItem('locale')
  if (chooselang) return chooselang
  // if not choose language
  const lang = (navigator.language || navigator.browserLanguage).toLowerCase()
  const locales = Object.keys(messages)
  return locales.includes(lang) ? lang : 'zh-cn'
}
const i18n = createI18n({
  locale: getLanguage(),
  fallbackLocale: 'en',
  global: true,
  messages
})
export function $t(args) {
  return i18n.global.tc(args)
}
console.log($t('login.title'))
export default (app) => {
  app.use(i18n)
}

illustrate

The getLanguage function determines whether the current localStorage has a selected language. If not, it gets the language of the current browser.
Encapsulate the $t function and export it for use in js files

3. In main.js

import language, { getLanguage, $t } from './language'
language(app)

4. Use in vue file

<template>
    //1. 
	<div class="login clamp ta-c fs-28 fw-b m-b10">{{ $t('login.title') }}</div>
	//2.
	<el-input v-model="$t('login.title')"></el-input>
</template>

How to switch language dynamically and change elementUI language?

1. Use vuex to write a method in mutations to change the element language

//---------------------- state-----------------------------
import { getLanguage } from '@/language'
const state = {
  lang: getLanguage()
}
export default state
//---------------------- mutations-----------------------------
import * as Types from './types'
import locale from 'element-plus/lib/locale'
import localeZH from 'element-plus/lib/locale/lang/zh-cn'
import localeEN from 'element-plus/lib/locale/lang/en'
import localePL from 'element-plus/lib/locale/lang/pl'
const element = {
  'zh-cn': localeZH,
  'en': localeEN,
  'pl': localePL
}
const mutations = {
  // Switch language [Types.SET_LANG](state, lang) {
    state.lang = lang
    localStorage.setItem('locale', lang)
    locale.use(element[lang])
  }
}
export default mutations
//------------------------- types-----------------------------
export const SET_LANG = 'SET_LANG'

2. Use

import * as Types from '@/store/types'
import { useI18n } from "vue-i18n";
export default {
  setup(props,ctx) {
    const { locale: lang } = useI18n({ useScope: "global" })
    let store = useStore()
    const handelLanguage = (name) => {
      lang.value = name
      store.commit(Types.SET_LANG, name)
    }
    return {
      handelLanguage
    }
  }
}

After changing the elementUI component view, it is not updated?

At this point you will find that even if we submit a commit to change the language page of elementUI, there is no change, because the view component is not updated. How can we refresh the component to reload it?

1. Control view display/hide on router-view

//---------------------- template-----------------------------
<router-view v-if="isReloadRouter"/>
//---------------------- script-----------------------------
const reload = () => {
	 state.isReloadRouter = false
     nextTick(() => {
       state.isReloadRouter = true
     })
}
provide("reload", reload)
<-- introduce provide nextTick ->

2. Call reload when switching languages

 const handelLanguage = (name) => {
      lang.value = name
      store.commit(Types.SET_LANG, name)
      inject('reload')()
    }

3. You need to call commit in main.js, otherwise the language will not be changed when you enter elementUI for the first time

import language, { getLanguage, $t } from './language'
import '@/styles/elementDefault.scss'
store.commit(Types.SET_LANG, getLanguage())

How to use $t function globally? How to use vue-i18n in js files?

Globally hang on the $t function and use the $t function directly in the js file.

Method 1: Hang it globally through app.config.globalProperties

Method 2: Implemented through provide and inject

import language, { getLanguage, $t } from './language'
const app = createApp(App);
//---------------------- app.config.globalProperties-----------------------------
app.config.globalProperties.$t = $t
// Use import { getCurrentInstance } from 'vue'
const { proxy } = getCurrentInstance()
proxy.$t()
// ----------------------- provide, inject -----------------------------
// app.provide('$t', $t) in main.js
// Using const $t = inject('$t')
ElMessage.warning({
  message: $t('login.warnMessage'),
   type: 'warning'
 });

Vue3 does not recommend mounting something on the prototype chain, but rather recommends using provide and inject, so it is best to use provide and inject through dependency and injection

You cannot use $t directly in router.js, you need to import this function yourself

import { $t } from '@/language'
{
        path: '/mainManage/device',
        name: 'device',
        hidden: false,
        meta: { icon: 'circle', title: $t('router.device') },
        component: () =>
          import(/* webpackChunkName: "device" */ '@/views/mainManage/device')
      },

There is a problem at present: because the field displayed in my menu is taken from the title in the routing information, router.js is only called when the project is first entered. When the language is switched, the menu field will not switch dynamically. It will only change when the browser is refreshed. If there is a solution, please leave a message to let me know! ! !

Summarize

This article ends here. I hope it can be helpful to you. I also hope you can pay more attention to more content on 123WORDPRESS.COM!

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Table of contents

Preface

How to switch between multiple languages?

1. Install the vue-i18n package

2. Create a new one in the src directory as shown below:

3. In main.js

4. Use in vue file

How to switch language dynamically and change elementUI language?

1. Use vuex to write a method in mutations to change the element language

2. Use

After changing the elementUI component view, it is not updated?

1. Control view display/hide on router-view

2. Call reload when switching languages

3. You need to call commit in main.js, otherwise the language will not be changed when you enter elementUI for the first time

How to use $t function globally? How to use vue-i18n in js files?

You cannot use $t directly in router.js, you need to import this function yourself

Summarize

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