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i18next-ko

With this awkwardly named library, you can easily translate your KnockoutJS applications. It uses i18next, so you may want to read their documentation to know how to use variables and stuff.

Installation

If you are using npm, you can get i18next-ko with npm install i18next-ko. It works like a charm with Browserify, just require('i18next-ko').

If you use bower, you can get i18next-ko with bower install i18next-ko.

You can also use the prebuilt standalone file that works in every environment.

Note that while i18next is included in the standalone build and as dependency in the npm package, KnockoutJS is not.

Usage

Initialization

To initialize i18next-ko, you need to call i18nextko.init(). It takes the following parameters: i18nextko.init(resourceStore, language, ko).

  • The resourceStore is a i18next resource store. It looks like this:
  {
    en: {
      translation: {
        'testTranslation': 'Test translation'
      }
    },

    de: {
      translation: {
        'testTranslation': 'Test-Übersetzung'
      }
    }
  }
  • The language is the language that will be used by default. Defaults to 'en'.
  • You may set ko to your KnockoutJS object. Usually, this is not needed but it may solve some issues if you use Browserify and have some dependencies that require different versions of KnockoutJS. Defaults to window.ko.

Note that the i18nextko object basically is a singleton. Once you initialized it, the translations and the i18n binding will be available everywhere.

Using translations

i18next-ko comes with exactly one new KnockoutJS binding: The i18n binding.

You can use the binding in three different ways:

  1. Use a string: data-bind="i18n: 'testTranslation'" sets the content of the element to the translation with the key testTranslation.

    It is automatically updated whenever the language is changed.

  2. Use a key and add variables: data-bind="i18n: { key: 'greeting', options: { name: name } }" sets the content of the element to the translation with the given key.

    The variable {{name}} in the translation is replaced with the value of the name property of the view model.

    It is automatically updated whenever the language is changed or the value of any observable variable is changed.

  3. Mix both approaches and bind multiple attributes: data-bind="i18n: { html: 'testTranslation', title: { key: 'greeting', options: { name: name } } }" sets the content of the element to the translation with the key testTranslation.

    The title attribute to the translation with the key greeting, using the name property of the view model for the variable {{name}}.

    You can use as many attributes as you want. Translations are automatically updated whenever the language is changed or the value of any observable variable is changed.

You may also get the underlying i18next object with i18nextko.i18n.

Changing the language

The language can be changed with i18nextko.setLanguage('your-language'). This will update every translation, as documented above.

Changing the language by using the setLng method of i18next directly will not update the bindings.

Utility functions

You can get a computed observable of a translation with i18nextko.t(). It works in the same way as i18n.t but is updated whenever the language is changed.