How to implement multi-language switching function in uniapp

How to implement multi-language switching function in uniapp

With the rapid development of mobile Internet, it has become more and more important to develop an application that supports multiple languages. In the uniapp framework, we can easily implement multi-language switching functions and provide users with a more friendly interface experience. This article will introduce how to implement multi-language switching function in uniapp and give code examples.

1. Create language pack files
First, we need to create multi-language language pack files. In uniapp, JSON formatted files can be used to store translations for various languages. We can create a separate JSON file for each language and store the translation content of the corresponding language in the file.

For example, we take Chinese and English as an example and create two files zh-CN.json and en-US.json. Among them, the zh-CN.json file stores Chinese translation content, and the en-US.json file stores English translation content. The content of the file is as follows:

// zh-CN.json
{
"welcome": "Welcome to uniapp",
"home": "Home",
"about ": "About us"
}

// en-US.json
{
"welcome": "Welcome to uniapp",
"home": "Home" ,
"about": "About Us"
}

2. Switching languages
In uniapp, you can switch languages ​​by setting global variables. We can store the current language in a global variable and obtain the corresponding translation content from the corresponding language pack file based on the current language where the translation content needs to be displayed.

First, define the global variable lang in the main.js file and set its default value to zh-CN, indicating that the current language is Chinese. The code is as follows:

// main.js
import Vue from 'vue'
import App from './App'

Vue.config.productionTip = false

App.mpType = 'app'

// Define the global variable lang
Vue.prototype.lang = 'zh-CN'

const app = new Vue({

...App

})
app.$mount()

Then, where the translation content needs to be displayed, the corresponding translation content can be obtained through Vue's calculated properties. The code is as follows:

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  <text>{{ $t('welcome') }}</text>
  <text>{{ $t('home') }}</text>
  <text>{{ $t('about') }}</text>

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export default {
computed: {

  // 获取翻译内容
  $t() {
     return function(key) {
        const lang = this.$root.lang
        // 根据当前语言从语言包文件中获取对应的翻译内容
        let translations = {}
        try {
           translations = require(`../lang/${lang}.json`)
        } catch (e) {
           console.warn(`Translation file not found for language: ${lang}`)
        }
        return translations[key] || ''
     }
  }

}
}
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In this way, when the value of the lang variable becomes en-US , the text content on the page will automatically switch to English.

3. Switch language button
In order to facilitate users to switch languages, we can add a button to switch languages ​​on the page. When the user clicks the button, the current language is switched.

First, add a button on the page with the following code:

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  切换语言
  <text>{{ $t('welcome') }}</text>
  <text>{{ $t('home') }}</text>
  <text>{{ $t('about') }}</text>

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Then, add the switchLanguage method in the script corresponding to the page, the code is as follows:

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export default {
methods: {

  // 切换语言
  switchLanguage() {
     // 获取当前语言
     const lang = this.$root.lang
     // 切换为另一种语言
     this.$root.lang = (lang === 'zh-CN' ? 'en-US' : 'zh-CN')
  }

}
}
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After achieving the above effect, when the user clicks the button, the text content on the page will automatically switch according to the current language.

Summary
Through the above steps, we can implement multi-language switching function in uniapp. First, create a language pack file to store translation content in various languages, then switch languages ​​by setting global variables, and obtain the corresponding translation content through calculated attributes on the page. Finally, add a button to switch languages ​​to switch languages.

The above is the process of implementing the multi-language switching function in uniapp. I hope it will be helpful to you!

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