Best Practices for Angular Directive Controllers

When defining a directive controller, there are two main approaches outlined below for consideration:

Option 1:

angular.module('app')directive('AppHeader', AppHeader);

function AppHeader() {
  var headerDirective = {
     restrict: 'E',
     templateUrl: 'header.html',
     link: linkFunc, 
     controllerAs: 'vm',
     controller: NavCtrl
   };
   return headerDirective;

   function linkFunc(scope, element, attrs) {
      /* */
   }
}

NavCtrl.$inject = ['$scope', 'Service'];
function NavCtrl($scope, Service) {
    var vm = this;
    /* Controller actions */
}

In the above code snippet, the controller is separated from the directive function block.

Option 2:

 angular.module('app').directive('AppHeader', AppHeader);

 function AppHeader() 
 {
     var headerDirective = {
        restrict: 'E',
        templateUrl: 'header.html',
        link: linkFunc, 
        controllerAs: 'vm',                
        controller: NavCtrl
      };

     return headerDirective;

     function linkFunc(scope, element, attrs) {
        /* */
     }
     NavCtrl.$inject = ['$scope', 'Service'];
     function NavCtrl($scope, Service) {
        var vm = this;
        /* Controller actions */
     }
}

In Option 2, the controller is added within the directive function block.

Which of these methods do you believe to be the best practice when creating and defining Directive controllers, and why? Your input is much appreciated!

Answer №1

When it comes to Option 2, the function has been scoped at a level where it is actually being used.

For Option 1, the function has been scoped one level higher, which is unnecessary since it will not be reused.

I believe that Option 2 appropriately scopes the function.

Additionally, you may consider wrapping the entire code of Option 2 in an IIFE (immediately invoked function expression)

(function(){
   //Your code here

})();

Answer №2

It is recommended to choose option 1 for the following reasons.

In order to avoid potential issues with unreachable code after a return statement, it is best practice to place the directive's controller outside of the directive's closure.

To learn more about coding conventions and styling in Angular, refer to John Papa's style guide. He provides valuable insights on various aspects of code formatting in Angular.

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