koa-adam-locale

Simple Multi Language Middleware for Koa.

Installation

$ npm install koa-adam-locale

Example

app.js:

var Path = require('path');
var View = require('koa-views')
var KAL = require('koa-adam-locale');
var koa = require('koa');
var app = koa();

/* i18n */
app.use(KAL({
  path: Path.resolve(__dirname, 'i18n'),
  // reference: require('./i18n_ref'),
  cookieKey: 'current_lang',
  cookies: {
    maxAge: 365*24*60*60*1000,
    domain: 'hello.com',
    signed: false
  },
  default: 'en_US',
  supported: [{code:'en_US', lang:'English'},{code:'zh_CN', lang:'简体中文'}]
}, app));

/* templating */
app.use(View(__dirname + '/views', {
  default: 'ejs'
}));

app.use(function * () {
  if(!this.path == '/') return;
  yield this.render('locale')
})

app.listen(process.argv[2])

i18n/en_US.json

{
  "hello": "hello",
  "world": "world"
}

views/locale.ejs

<p><%= _i18n_.hello %>, <%= _i18n_.world %>.</p>
<p>current:<%= _i18n_current_ %>.</p>
<% for(var i in _i18n_supported_) { %>
<a href='/set_locale?lang=<%= _i18n_supported_[i].code %>'>
	switch to <%= _i18n_supported_[i].lang %>
</a>
<% } %>

Options

path {String}

The folder path of i18n files

reference {Object}

The reference of i18n Object, key of this reference should match the code, like 'zh_CN', 'en_US' (Case sensitive), and this parameter has a higher priority than path.

supported {Array}

The supported languages. default value: [{code:'en_US', lang:'English'},{code:'zh_CN', lang:'简体中文'}]

Example:

app.use(KAL({
  path: Path.resolve(__dirname, 'i18n'),
  // reference: require('./i18n_ref'),
  supported: [{code:'en_US', lang:'English'},{code:'zh_CN', lang:'简体中文'}]
}, app));

namespace {String}

Custom template data params namespace. Default value is 'locals'

• koa-views 2.x - ctx.locals
• koa-views 3.x - ctx.state

Example:

// for koa-views 3.x
app.use(KAL({
  path: Path.resolve(__dirname, 'i18n'),
  // reference: require('./i18n_ref'),
  supported: [{code:'en_US', lang:'English'},{code:'zh_CN', lang:'简体中文'}],
  namespace: 'state'
}, app));

cookieKey {String}

cookies {Object}

Store the selected language in the cookie. see koa cookie for more information.

Example:

app.use(KAL({
  path: Path.resolve(__dirname, 'i18n'),
  cookies: {
    domain: 'hello.com',
    maxAge: 365*24*60*60*1000
  }
}, app));

default {String}

Default language

Example:

app.use(KAL({
  path: Path.resolve(__dirname, 'i18n'),
  // reference: require('./i18n_ref'),
  supported: [{code:'en_US', lang:'English'},{code:'zh_CN', lang:'简体中文'}],
  default: 'en_US'
}, app));

set_url {String}

The url to switch current language. default value: /set_locale

Example:

app.use(KAL({
  path: Path.resolve(__dirname, 'i18n'),
  // reference: require('./i18n_ref'),
  set_url: '/set_locale'
}, app));

Then you can set current language by request url like this '/set_locale?lang=en_US'

Local Params

The following three params are set to ctx.namespace, default ctx.locals. For koa-views 3.x version, you can set namespace to ctx.state

• this.locals._i18n_ {Object}
• this.locals._i18n_current_ {String}
• this.locals._i18n_supported_ {Array}

static addLanguageHelper

添加dust模板的helper，用于展示语言名称

var dust = require('dustjs-helpers');
KAL.addLanguageHelper(dust)

在模板里使用@language

{@language code="ru_RU" current="zh_CN" /} // 输出"俄语"

{@language code="ru_RU" current="en_US" /} // 输出"Russian"

{@language code="ru_RU" /} // 根据系统设置的自动判断语言

Debug

Set the DEBUG environment variable to koa-adam-locale when starting your server.

$ DEBUG=koa-adam-locale

License

MIT