vue-i18n

Internationalization plugin of Vue.js

Compatibility

• Vue.js 1.0.0+
• Vue.js 2.0.0-beta.1+

Installation

CDN

jsdelivr

<script src="https://cdn.jsdelivr.net/vue.i18n/4.2.1/vue-i18n.min.js"></script>

NPM

stable version

$ npm install vue-i18n

development version

$ git clone https://github.com/kazupon/vue-i18n node_modules/vue-i18n
$ cd node_modules/vue-i18n
$ npm install
$ npm run build

When used in CommonJS, you must explicitly install the router via Vue.use():

⚠️ if you are using vue-router, you must install with Vue.use() in advance of instance methods (router#map, router#start, ...etc).

var Vue = require('vue')
var VueI18n = require('vue-i18n')

Vue.use(VueI18n)
Vue.config.lang = 'ja'
Vue.locale('ja', { ... })

You don't need to do this when using the standalone build, as it installs itself automatically.

Usage

var Vue = require('vue')
var VueI18n = require('vue-i18n')

// ready translated locales
var locales = {
  en: {
    message: {
      hello: 'hello world'
    }
  },
  ja: {
    message: {
      hello: 'こんにちは、世界'
    }
  }
}

// install plugin
Vue.use(VueI18n)


// set lang
Vue.config.lang = 'ja'

// set locales
Object.keys(locales).forEach(function (lang) {
  Vue.locale(lang, locales[lang])
})

// create instance
new Vue({ el: 'body' })

Template the following:

<p>{{ $t("message.hello") }}</p>

Output the following:

<p>こんにちは、世界</p>

Formatting

HTML formatting

In some cases you might want to rendered your translation as an HTML message and not a static string.

var locales = {
  en: {
    message: {
      hello: 'hello <br> world'
    }
  }
}

Template the following (notice the tripple brackets):

<p>{{{ $t('message.hello') }}}</p>

Output the following (instead of the message pre formatted)

<p>hello
<!--<br> exists but is rendered as html and not a string-->
world</p>

Named formatting

Locale the following:

var locales = {
  en: {
    message: {
      hello: '{msg} world'
    }
  }
}

Template the following:

<p>{{ $t('message.hello', { msg: "hello"}) }}</p>

Output the following:

<p>hello world</p>

List formatting

Locale the following:

var locales = {
  en: {
    message: {
      hello: '{0} world'
    }
  }
}

Template the following:

<p>{{ $t('message.hello', ["hello"]) }}</p>

Output the following:

<p>hello world</p>

Support ruby on rails i18n format

Locale the following:

var locales = {
  en: {
    message: {
      hello: '%{msg} world'
    }
  }
}

Template the following:

<p>{{ $t('message.hello', { msg: "hello"}) }}</p>

Output the following:

<p>hello world</p>

Fallback translation

Locale the following:

var locales = {
  en: {
    message: 'hello world'
  },
  ja: {
  }
}
Vue.config.lang = 'ja'

Template the following:

<p>{{ $t('message') }}</p>

Output the following:

<p>hello world</p>

Component locale

You can translate component based.

The below locale setting example:

var locales = {
  en: {
    message: {
      hello: 'hello world'
    }
  },
  ja: {
    message: {
      hello: 'こんにちは、世界'
    }
  }
}
      
Vue.config.lang = 'ja'
Object.keys(locales).forEach(function (lang) {
  Vue.locale(lang, locales[lang])
})

new Vue({
  el: '#app',
  components: {
    component1: {
      template: '<p>component1 local: {{ $t("hello") }}</p>'
        + '<p>component1 global: {{ $t("message.hello") }}</p>',
      locales: {
        en: { hello: 'hello component1' },
        ja: { hello: 'こんにちは、component1' }
      }
    }
  }
})

Template the following:

<div id="app">
  <p>{{ $t("message.hello") }}</p>
  <component1></component1>
</div>

Output the following:

<div id="app">
  <p>こんにちは、世界</p>
  <p>component1 local: こんにちは、component1</p>
  <p>component1 global: こんにちは、世界</p>
</div>

📝 If you set the locale of same keypath as global locale (Vue.locale()), in its component, $t is translate with component locale.

Dynamic locale

Sometimes, you need to set dynamically the locale from external location. You can set dynamically it with Vue.locale.

the below the example:

var self = this
var lang = 'ja'
Vue.locale(lang, function () {
  self.loading = true
  return fetch('/locale/' + lang, {
    method: 'get',
    headers: {
      'Accept': 'application/json',
      'Content-Type': 'application/json'
    }
  }).then(function (res) {
    return res.json()
  }).then(function (json) {
    self.loading = false
    if (Object.keys(json).length === 0) {
      return Promise.reject(new Error('locale empty !!'))
    } else {
      return Promise.resolve(json)
    }
  }).catch(function (error) {
    self.error = error.message
    return Promise.reject()
  })
}, function () {
  Vue.config.lang = lang
})

Dynamic locale interfaces

In dynamic locales, You can use the two type interfaces:

1. function

You need to implement locale setting that return function have function (resolve, reject) like promise (future). The following, those argument of the function, if successful, you need to use the resolve according to locale object. if failed, you need to use reject

• successful: resolve
• failed: reject

2. promise

As mentioned above, You need to implement locale setting that return a promise. if successful, you need to resolve according to locale object. if failed, you need to use reject.

⚠️ You must return a ES6 compatible promise.

API References

Global Config

lang

• Type: String

• Default: en

• Usage:

  Get or set a translation language code. Default by en string value.

  Vue.config.lang = 'ja'

fallbackLang

• Type: String

• Default: en

• Usage:

  Get or set a translation fallback language code. Default by en string value.

  Vue.config.fallbackLang = 'ja'

Global Methods

Vue.locale ( lang, [locale], [cb] )

• Arguments:

  • {String} lang
  • {Object | Function} [locale]
  • {Function} [cb]

• Return:

  • locale function or object

• Usage:

  Register or retrieve a locale

  // register locale with object
  Vue.locale('en', { message: 'hello' })
  
  // register with external locale
  Vue.locale('ja', function () {
    return fetch('/locales/ja', {
      method: 'get',
      // ...
    }).then(function (json) {
      return Promise.resolve(json)
    }).catch(function (error) {
      return Promise.reject()
    })
  }, function () {
    Vue.config.lang = 'ja'
  })

Vue.t( keypath, [lang], [arguments] )

• Arguments:

  • {String} keypath
  • {String} [lang]
  • {Array | Object [arguments]

• Return: Translated string

• Usage: This is the same as the $t method. This is translate function for global locale only. more detail see $t

Constructor Options

locales

• Type: Object

• Details:

  A locale definition object to be made available to the Vue instance only.

• See also:

  • $t

Instance Methods

$t(keypath, [lang], [arguments])

• Arguments:

  • {String} keypath
  • {String} [lang]
  • {Array | Object [arguments]

• Return: Translated string

• Usage: Translate the locale of keypath. Translate in preferentially component locale than global locale. If not specified component locale, translate with global locale. If you specified lang, translate the locale of lang. If you specified keypath of list / named formatting local, you must specify arguments too. For arguments more details see Formatting.

Contributing

• Fork it !
• Create your top branch from dev: git branch my-new-topic origin/dev
• Commit your changes: git commit -am 'Add some topic'
• Push to the branch: git push origin my-new-topic
• Submit a pull request to dev branch of kazupon/vue-i18n repository !

Development Setup

# install deps
npm install

# build dist files
npm run build

# lint
npm run lint

# run unit tests only
npm run unit

# run e2e tests only
npm run e2e

# lint & run all tests
npm test

Changelog

Details changes for each release are documented in the CHANGELOG.md.

License

MIT