Setting up AngularJS Modules

Seeking guidance on a recommended approach.

I have a module where I am configuring some custom headers. It's a simple task:

  $httpProvider.defaults.headers.common['token'] = function() {
    return token;
  };

The token is a value that needs to be fetched using $http.get() when the page loads.

Initially, I thought about placing this in my controller. However, upon reflection, it seems more appropriate to handle this in the module configuration during page load where I set my custom headers:

var app = angular.module('app',['ngRoute', 'ngResource'],function($httpProvider) {
   // Custom headers
});

I have a two-fold question:

  1. Is this the most effective method?
  2. If so, how can I initiate a $http.get() request within the module config?

Answer №1

When working with app.config, you may have discovered that it does not allow the use of services like $http (or any custom service) as they are defined after app.config is run. Instead, consider placing the call in your app.run function, where there are no restrictions on using services.

Determining whether this approach is suitable depends on the specific use-case at hand. Since $http calls are asynchronous, you cannot guarantee that the token will be available in your controllers or services when the app starts, as the http call may not have completed yet. This could pose a problem if immediate access to the token is required.

Alternatively, depending on the scenario, utilizing a resolve-function on routes requiring the token might be a more effective solution. A route will delay loading any controller and template until the resolve-function has been executed, ensuring that the token is present before the controller runs.

Check out this informative video on resolves for a comprehensive introduction.

Furthermore, these methods can be combined by initiating the http-call in app.run and employing a resolve function to confirm the token's existence prior to loading the controller.

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