What is the best way to establish a global constant that can be accessed by multiple controllers in AngularJS?

Question

What is the best way to establish a global constant that can be accessed by multiple controllers in AngularJS?

Imagine I need to create a constant variable that can be shared between controllers in Angularjs;

$webroot = "localhost/webroot/app"

After some research, it appears that services are the recommended approach. But which one should I use? Should I implement a factory, service, value, or something else?

The angularjs-master-seed's services.js is shown below;

angular.module('myApp.services', []).value('version', '0.1');

How can I update it to include a constant $webroot that can be accessed by multiple controllers?

Would the following code work?

angular.module('myApp.services', [])
        .value('version', '0.1')
        .constant('webroot','localhost/webroot/app');

If this implementation is correct, how would I call it in the controller?

javascript angularjs angularjs-service

Answer 1

Answer №1

What happens if you require additional constants? One solution is to introduce a configuration object that can be injected as needed. This simplifies the process, especially when using separate dev.config and prod.config files that can be easily swapped during build time.

app.factory('Config', function(){
    return{
        webRoot: "localhost/webroot/app",
        moreSettings: "abc"
    };
});

Answer 2

What happens if you require additional constants? One solution is to introduce a configuration object that can be injected as needed. This simplifies the process, especially when using separate dev.config and prod.config files that can be easily swapped during build time.

app.factory('Config', function(){
    return{
        webRoot: "localhost/webroot/app",
        moreSettings: "abc"
    };
});

Answer 3

Answer №2

If your variable remains constant or is only set once, using value is the best choice.
You can define it like so:

app = angular.module('myApp', []);
app.value('$webroot', 'localhost/webroot/app');

Afterwards, you can inject the service into your controller and utilize it:

app.controller('myController', ['$scope', '$webroot', function($scope, $webroot) {
  $scope.webroot = $webroot;
}]);

Edit #1
If your question has been updated: You can use a constant in the same manner as a value:

app = angular.module('myApp', []);
app.constant('$webroot', 'localhost/webroot/app');

app.controller('myController', ['$scope', '$webroot', function($scope, $webroot) {
  $scope.webroot = $webroot;
}]);

Answer 4

If your variable remains constant or is only set once, using value is the best choice.
You can define it like so:

app = angular.module('myApp', []);
app.value('$webroot', 'localhost/webroot/app');

Afterwards, you can inject the service into your controller and utilize it:

app.controller('myController', ['$scope', '$webroot', function($scope, $webroot) {
  $scope.webroot = $webroot;
}]);

Edit #1
If your question has been updated: You can use a constant in the same manner as a value:

app = angular.module('myApp', []);
app.constant('$webroot', 'localhost/webroot/app');

app.controller('myController', ['$scope', '$webroot', function($scope, $webroot) {
  $scope.webroot = $webroot;
}]);

What is the best way to establish a global constant that can be accessed by multiple controllers in AngularJS?

Answer №1

Answer №2

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