如何在来自另一个文件的控制器中定义变量？

Question

Here is my sample code: en.js

var translationsEN = {

USERNAME:     'Username',
PASSWORD:     'Password',
LOGIN:    'Login',
CANCEL:   'Cancel' };

and my controller:

.config(function ($routeProvider, $translateProvider) {
...
$translateProvider.translations('en_US', translationsEN);
$translateProvider.preferredLanguage('en_US');
...

I'm using the module angular-translate of Pascal Precht. When I updated my files, in the console is the message: "translationsEN is not defined" (in my controller) and the message from my language file: "translationsEN is defined but never used"

How can I defined the variable in my Controller? Do I need to define the variable as a service?

Answer 1

The Angular way to achieve your goal is indeed to use a service or, in the case of a simple and constant variable, a constant service :

myModule.constant(
    'myModule.translations.EN',
    {
        USERNAME: 'Username',
        PASSWORD: 'Password',
        LOGIN: 'Login',
        CANCEL: 'Cancel'
    }
);

All you have to do then is to inject it in your configuration method:

myModule.config([
    '$routeProvider',
    '$translateProvider',
    'myModule.translations.EN',
    function ($routeProvider, $translateProvider, translationsEN) {
        // …
        $translateProvider.translations('en_US', translationsEN);
        $translateProvider.preferredLanguage('en_US');
    }
]);

If, for some reasons, you absolutely need to use a classical variable, for instance because it's also used in a non-Angular script, simply be sure to declare it before your configuration method.

Answer 2

As @Blackhole explained in his answer, the general way to achieve that in angular is to use a provider.

However, in your specific use case of angular-translate , the way to achieve this would be to load your translation files with $translateProvider :

Rename en.js to en_US.json and put it in a folder named, for example, /locales . Make sure your files are valid json, ie you want to remove var translationsEN = .

Then configure $translateProvider like that :

$translateProvider.useStaticFilesLoader({
    prefix: '/locales/',
    suffix: '.json'
});

This will load all your json translations files, located in the folder /locales .

That way your translation files will be totally independent of your application logic.