Where to put user defined functions in Angular JS?

问题:

In my view, I want to render:

<p>
  {{ say() }}
</p>

Where say is defined as such:

say = function() {
  return "Hello World";
}

I can define it in my controller:

function TestCtrl($scope) {
  $scope.say = function() { ... };
}

But then it's only accessible within that controller.

If I define the function outside the Angular file structure, it renders nothing. Same if I define it in my controllers.js file, but outside a controller function scope.

Where is the proper place to put my function, so I can render it in any controller?

回答1:

One way is to create a service with the functions you want to share across multiple controllers. See this post for more info.

After you do so you can inject the service you created into any controller and access the say() function with code something like this:

function TestCtrl($scope, myService){
   $scope.say = myService.say;
}

Where you defined myService as:

angular.module('myApp', [])
    .factory('myService', function () {
        return {
            say: function () {
                return "Hello World";
            }
        }
    });

Here is a jsFiddle with an example.