vuex-i18n

We are big fans of the awesome vue, vuex and vue-router libraries and were just looking for an easy to use internationalization plugin, employing as much of the "standard library" as possible.

The main difference to other internationalization plugins is the ease of use and support for locales directly with the application or later from the server.

Requirements

• Vue ^2.0.0
• Vuex ^2.0.0

Installation

$ npm install vuex-i18n

Setup

The vuex-i18n plugin is intended to be used for applications that use vuex as store and require localized messages. Make sure that both vue and vuex have been loaded beforehand.

The plugin provides a vuex module to store the localization information and translations and a plugin to allow easy access from components.

The plugin does not make any assumption on how you want to load the localization information. It can be loaded on start in your application bundle or dynamically after when the user is switching to a different language.

A corresponding example can be found in the test directory.

// load vue and vuex instance
import Vue from 'vue';
import Vuex from 'vuex';

// load vuex i18n module
import vuexI18n from 'vuex-i18n';

// initialize the vuex store using the vuex module. note that you can change the
//  name of the module if you wish
const store = new Vuex.Store();

// initialize the internationalization plugin on the vue instance. note that
// the store must be passed to the plugin. the plugin will then generate some
// helper functions for components (i.e. this.$i18n.set, this.$t) and on the vue
// instance (i.e. Vue.i18n.set).
Vue.use(vuexI18n.plugin, store);

// please note that you must specify the name of the vuex module if it is
// different from i18n. i.e. Vue.use(vuexI18n.plugin, store, 'myName')


// add some translations (could also be loaded from a separate file)
// note that it is possible to use placeholders. translations can also be
// structured as object trees and will automatically be flattened by the the
// plugin
const translationsEn = {
	"content": "This is some {type} content"
};

// translations can be kept in separate files for each language
// i.e. resources/i18n/de.json.
const translationsDe = {
	"My nice title": "Ein schöner Titel",
	"content": "Dies ist ein toller Inhalt"
};

// add translations directly to the application
Vue.i18n.add('en', translationsEn);
Vue.i18n.add('de', translationsDe);

// set the start locale to use
Vue.i18n.set('en');

// create a new component (requires a div with id app as mount point)
// you can use the method $t to access translations. the value will be returned
// as is, if no corresponding key is found in the translations
var app = new Vue({
	store,
	el: '#app',
	template: `
		<div>
			<h1>{{ 'My nice title' | translate }}</h1>
			<p>{{ $t('content', {'type': 'nice'}) }}</p>
		</div>
	`
});

Usage

vuex-i18n provides easy access to localized information through the use of the $t() method or the translate filter.

The plugin will try to find the given string as key in the translations of the currently defined locale and return the respective translation. If the string is not found, it will return as is. This wil allow you to setup an application very quickly without having to first define all strings in a separate template.

It is also possible to specify a fallback-locale $i18n.fallback(locale). If the key is not found in current locale, vuex-i18n will look for the key in the fallback-locale. If the key can not be found in the fallback-locale either, the key itself will be returned as translation.

<div>
	// will return: "Some localized information"
	{{ $t('Some localized information')}}
</div>

In larger projects, it is often easier to use a more robust translation key instead of the default text. Therefore it is also possible to specify the key and default translation. The default value will only be used, if the key cannot be found in the current and in the fallback locale.

<div>
	// will return: "Default information text" if the key non.existing.key is
	// not specified in the current and the fallback locale
	{{ $t('non.existing.key', 'Default information text')}}
</div>

Dynamic parameters that can be passed to the translation method in the form of
key/value pairs.

```javascript
<div>
	// will return: "You have 5 new messages"
	{{ $t('You have {count} new messages', {count: 5}) }}
</div>

It is possible to specify custom identifiers for variable substitutions. The respective identifiers - start and stop - must be passed when initializing the module. Please note that a regular expression is used to match the tags. Therefore it might be necessary to escape certain characters accordingly.

// i.e. to use {{count}} as variable substitution.
// the third parameter defines the module name and is i18n per default
Vue.use(vuexI18n.plugin, store, 'i18n', ['{{','}}']);

Basic pluralization is also supported. Please note, that the singular translation must be specified first, followed by plural translations denoted by :::. Up to six pluralization forms are supported based on configuration taken from vue-gettext. The second option is used for variable replacements. The third option to define if the singular or pluralized translation should be used (see below for examples).

<div>
	// will return: "You have 5 new messages" if the third argument is 5"
	// or "You have 1 new message" if the third argument is 1
	// or "You have 0 new messages" if the third argument is 0 (note pluralized version)
	{{ $t('You have {count} new message ::: You have {count} new messages', {count: 5}, 5) }}
</div>

<div>
	// In case when there are more than singular and plural versions like in Latvian language.
	// will return: "5 bērni" (in english - 5 children) if the third argument is 5"
	// or "2 bērni" if the third argument is 2
	// or "1 bērns" if the third argument is 1    
	// or "0 bērnu" if the third argument is 0
	{{ $t('{count} bērns ::: {count} bērni ::: {count} bērnu', {count: 5}, 5) }}
</div>

The current locale can be set using the $i18n.set() method. By default, the translation method will select the pre-specified current locale. However, it is possible to request a specific locale using the $tlang() method.

<div>
	// will return the english translation regardless of the current locale
	{{ $tlang('en', 'You have {count} new messages', {count: 5}) }}
</div>

There are also several methods available on the property this.$i18n or Vue.i18n

$i18n.locale(), Vue.i18n.locale()
// get the current locale

$i18n.set(locale), Vue.i18n.set(locale)
// set the current locale (i.e. 'de', 'en')

$i18n.add(locale, translations), Vue.i18n.add(locale, translations)
// add a new locale to the storage
// (i.e. 'de', {'message': 'Eine Nachricht'})

$i18n.localeExists(locale), Vue.i18n.localeExists(locale)
// check if the given locale translations are present in the store

$i18n.keyExists(key), Vue.i18n.keyExists(key)
// check if the given key is available in the current or fallback locale

$i18n.remove(locale), Vue.i18n.remove(locale)
// remove the given locale from the store

$i18n.fallback(locale), Vue.i18n.fallback(locale)
// set a fallback locale if translation for current locale does not exist

Contributions

Any comments or suggestions are very welcome.