how to reuse a function in multiple controllers

Question

I have multiple controllers for multiple routes:

app.controller('FirstController', function ($scope) {
  $scope.func = function () {
    console.log('route 1');
  }
}
app.controller('SecondController', function ($scope) {
  $scope.func = function () {
    console.log('route 2');
  }
}
...

and a directive that uses the $scope.func, this way:

app.directive('thedirective', function () {
  return {
    link: function (scope, $element, attrs) {
      $scope.func(attrs.thedirective);
    }
  }
});

$scope.func is different in each controller. I expect the $scope.func to log "route 1" when we are in route1 and FirstController is the current controller and to log "route 2" when in route 2, but only "rout 1" is what I get in console. may you please tell me why changing route doesn't change $scope of directive?

Answer 1

In AngularJS if function is being used common in controllers.

Best practises is use service or factory which will inject to controller.

app.factory('commonService', function ($scope) {
     var obj= {};
      obj.func = function () {
        console.log('route 1');
      }
     obj.func1 = function () {
        console.log('route 2');
      }
  return obj;
    }
    app.controller('FirstController', function ($scope,commonService) { 
        console.log('route 1' + commonService.func());  
    }
    app.controller('SecondController', function ($scope,commonService) { 
        console.log('route 2' + commonService.func1());  
    }

And when we talk about directive ,scope of the directive will be with one controller either directive controller or outside controller which we defined.

<div ng-controller="firstController">
<your-directive />
</div>

<div ng-controller="secondController">
<your-directive />
</div>