JavaScript for detecting browser language preference [duplicate]

Answer 1

i had a diffrent approach, this might help someone in the future:

the customer wanted a page where you can swap languages. i needed to format numbers by that setting (not the browser setting / not by any predefined setting)

so i set an initial setting depending on the config settings (i18n)

$clang = $this->Session->read('Config.language');
echo "";

later in the script i used a function to determine what numberformating i need

function getLangsettings(){
  if(typeof clang === 'undefined') clang = navigator.language;
  //console.log(clang);
  switch(clang){
    case 'de':
    case 'de-de':
        return {precision : 2, thousand : ".", decimal : ","}
    case 'en':
    case 'en-gb':
    default:
        return {precision : 2, thousand : ",", decimal : "."}
  }
}

so i used the set language of the page and as a fallback i used the browser settings.

which should be helpfull for testing purposes aswell.

depending on your customers you might not need that settings.