Error encountered with the $get method of AngularJS Provider during configuration() function

Recently, I configured a Provider that fetches a language JSON file from a web server and delivers it to Angular within the config() method. Here is the provider setup:

.provider('language', function () {

    var languageWsURL
      , languageCode
      , languageAppName;

    return {
      'setLanguageWsURL' : function (url) {

        languageWsURL =  url;
      },
      'setLanguageAppName' : function (name) {

        languageAppName = name;
      },
      'setLanguageCode' : function (code) {

        languageCode = code;
      },
      '$get': ['$rootScope', '$window', '$http', function ($rootScope, $window, $http) {

        var loadLanguage = function () {

          if (languageWsURL && languageCode && languageAppName) {

            $http({
              'method':'GET',
              'url': languageWsURL,
              'params': {
                'application':languageAppName,
                'langCode':languageCode
              }
            }).success(function (data) {

              if (data.data && data.data.length > 0) {

                $rootScope.lang = data.data;
              }
            }).error(function (err) {

              $window.console.log('Error while retrieving app lang - languageProvider : ' + err);
            });
          } else {

            $window.console.error('Missing params to load language in languageProvider');
          }
        };

        return {
          'loadLanguage':loadLanguage
        };
      }]
    };
  });

In addition, I added a configuration function in index.js:

.config(['languageProvider', function (languageProvider) {

    languageProvider.setLanguageWsURL('http://localhost:3000');
    languageProvider.setLanguageAppName('antani');
    languageProvider.setLanguageCode('en');
    languageProvider.loadLanguage(); //error here

  }]);

However, there seems to be an issue as the languageProvider.loadLanguage() call results in a complex error message in the console:

http://errors.angularjs.org/1.2.23/$injector/modulerr?p0=app&p1=TypeError%3A%20undefined%20is%20not%20a%20function%0A%20%20%20%20at%20http%3A%2F%2Flocalhost%3A8000%2Fassets%2Fjs%2Findex.js%3A15%3A21%0A%20%20%2

Any ideas on how to resolve this issue?

Answer №1

$fetch object is specifically designed for initiating the service. It cannot be accessed during the configuration stage.

To use your loadLanguage function at the configuration stage, define it separately outside of your $fetch implementation.

Answer №2

languageProvider is missing the loadLanguage method, but it can be found in language. Since you are unable to inject a service into config(), your code should be structured as follows:


.config(['languageProvider', function (languageProvider) {
   languageProvider.setLanguageWsURL('http://localhost:3000');
   languageProvider.setLanguageAppName('antani');
   languageProvider.setLanguageCode('en');      
}])
.run(['language',function(language){
   language.loadLanguage();
}]);    

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