app.js is not properly identifying the navigator's language

This is the code snippet for my controller

app.controller('languagesCtrl', function($scope) {
  var lang = window.navigator.language || window.navigator.userLanguage;
  if (lang === 'it' || 'it-it' || 'it-IT') {
    $scope.showcase = 'Vetrina';
    $scope.products = 'Prodotti';
    $scope.cta = 'Nuova collezione strumenti';
  } else {
    $scope.showcase = 'Showcase';
    $scope.products = 'Products';
    $scope.cta = 'Check out new products!';
  }
});

Despite being certain that my navigator language is not 'it-IT' (verified here), the angular-based website does not utilize the content within the else statement.

javascriptangularjsangularjs-scopeoperators

Answer №1

Your statement will always hold true due to the specific use of the || operator.

Upon evaluation of the expression:

The first part (lang === 'it') can either be true or false, let's say it is false.

Therefore, the expression transforms into (false || 'it-it' || 'it-IT'), which will consistently return the next value in line, in this case it-it. Thus, the condition will always be met regardless.

Modify it as follows:

if (lang === 'it' || lang === 'it-it' || lang === 'it-IT')

OR a more simplified version:

if (['it','it-it','it-IT'].indexOf(lang) > -1)

Answer №2

ES6 provides an elegant solution for this

I thought I'd leave this here in case someone comes across it in the future. Utilize includes() with ES6.

['it','it-it','it-IT'].includes(language)

ES5 Approach

This used to be a stumbling block for me until I realized that I was using multiple OR comparisons incorrectly. So, I decided to improve readability by doing the following:

Array.prototype.contains = function(obj) {
    return this.indexOf(obj) > -1;
};

Now, you can implement it like this:

var language = $window.navigator.language.

if (['it','it-it','it-IT']].contains(language)) {
    alert('yes');
}

This is much easier to understand. And if you're using underscore.js, they offer the following helper function.

_.contains([], search)

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