cisoun/localization-js.md

## localization-js.md

      
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              localization-js.md
            
          
    Localization in JS

The Cheap way.
Summary

Here, we'll rely on a "lang" parameter in the URL (E.g: "?lang=fr") to know which language to use.
The code will then look for HTML elements with a data-i18n attribute. This attribute contains
the key of the translation whose value will be set as the inner HTML of the element.
JavaScript

// main.js
const i18n = {
	en: {
		'title': 'Hello world!'
	},
	fr: {
		'title': 'Salut le monde !'
	}
};

const elements = document.querySelectorAll('[data-i18n]');
const query    = window.location.search;
const params   = new URLSearchParams(query);
const lang     = params.get('lang');
if (lang && lang in i18n) {
	for (const element of elements) {
		element.innerHTML = i18n[lang][element.dataset.i18n];
	}
}
HTML

<!-- index.html -->
<!DOCTYPE html>
<html>
<head>
	<script src="main.js" defer></script>
</head>
<body>
	<h1 data-i18n="title">Fallback title</h1>
</body>
</body>
</html>
Now just open your HTML page and append "?lang=[code]" to the URL to change the language.