Locale & Formatter

We need the Formatter and Translations class and the parseLocale() function to handle translations.
In the context of the DOM we can also use the getLocaleOfDocument() method.

import {Translations} from 'https://cdn.skypack.dev/@schukai/[email protected]/source/i18n/translations.js';
import {Formatter} from 'https://cdn.skypack.dev/@schukai/[email protected]/source/text/formatter.js';
import {parseLocale} from 'https://cdn.skypack.dev/@schukai/[email protected]/source/i18n/locale.js';
import {getLocaleOfDocument} from 'https://cdn.skypack.dev/@schukai/[email protected]/source/dom/locale.js';

Let's start with the function parseLocale(). This function can create a Locale object from a string.

So we can create the corresponding Locale object from the string en_GB.

const locale = parseLocale('en_GB')
// ↦ Locale {}

If we move in the browser, so we can also use the function getLocaleOfDocument().
This function returns a locale object as a result.

This function looks if the HTML tag <html lang="en"> has a lang attribute.
If no locale is defined, the default value is assumed to be en.

We now need an object with the translations. For this we use the Translations class.

We can either define the translations ourselves or load them via an API.

// define translations
const translation = new Translations(parseLocale('en-GB'));
           text1: 'hello world!',
           text2: {
             'one': 'click once',
             'other': 'click ${n | tostring} times' // this is where the pipe comes in

// fetch from API
const translation = new Fetch('https://example.com/${language}.json').getTranslation('en-GB');
// ↦ https://example.com/en.json 

If we now have a translation, we can now read the desired strings. For this
we use the method Translation.getText() or the method Translation.getPluralRuleText()
for texts with more than one number.

const message = translation.getText('text1');
// -> hello world

To translate texts with number references, enter the desired number.

let n=1;
const message1 = translation.getPluralRuleText('text2', n);
// -> click once

const message2 = translation.getPluralRuleText('text2', n);
// -> click ${n} times

To replace the placeholder now, the formatter is used.

const text = new Formatter({n}).format(message2); 
// ↦ click 2 times

Finally, let's take a look at the formatter class from the i18n module.

import {Formatter} from 
    'https://cdn.skypack.dev/@schukai/[email protected]/source/i18n/formatter.js';

A tranlate object can be passed directly to this class.

There is also the possibility to pass values in the format string.

// define translation
const translations = new Translations('en')
        // text with placeholder
        message: "${animal} has eaten the ${food}!"

// without marker and inline values
new Formatter({}, translations).format("message::animal=dog::food=cake")
// ↦ dog has eaten the cake!