Unable to leverage injected services within a directive's link function

Recently, I attempted to incorporate a factory into an existing directive. As the feature is still in progress and my experience with Angular is limited but my knowledge of JavaScript is strong, I encountered some challenges. While everything seemed correct in terms of general JavaScript scope, both 'equipment' and 'remoteTerminalFactory' were mysteriously missing in the link function. Even after adding a variable before the return statement, it too vanished once inside the function. This issue seems to be related to scope, yet I am puzzled as to what could be causing it.

'use strict';

angular.module('App')
   .directive('modalRemoteTerminal', ['equipment', 'remoteTerminalFactory',      function (equipment, remoteTerminalFactory) {
    var test = true;
     // equipment & remoteTerminalFactory exist as expected
     return {
       templateUrl: 'app/equipment-detail/health-tab/modal-remote-terminal/remote-terminal.html',
       restrict: 'E',
       link: function (scope, element, attrs) {
        // test, equipment & remoteTerminalFactory are undefined
        scope.modalCtrlRemoteTerminal = {};
        scope.remoteTerminal = function(){ 
        scope.modalCtrlRemoteTerminal.openModal();
        };
      }
    };
  }]);

Answer №1

In order to access an angular factory, there are essential steps that need to be followed.

To see how this is done, visit this Plunker, where I have included your directive within an angular app and created mock factories.

Key points to remember:

  • Create services (mock factories) by using the angular module method.

    angular.module('App').factory('equipment', function () {
       return {
          tellSomething: function(text){
            console.log(text)
          }
       };
    });
    ...
    
  • Inject the services into the directive (as seen in your code snippet) and test using the service methods.

    link: function (scope, element, attrs) {
        //showing the access to injected factories/services
        equipment.tellSomething("I'm equipment factory");
        remoteTerminalFactory.tellSomething("I'm remoteTerminalFactory factory");
        ...
    
  • Ensure all angular files are imported correctly in the index.html file (make sure the file with app instantiation is imported first).

    <script src="script.js"></script>
    <script src="service.js"></script>
    <script src="directive.js"></script>
    
  • Include your custom directive in the index.html file.

    <body ng-app="App">
       <h2>Angular app</h2>
       <hr>
       <modal-remote-terminal></modal-remote-terminal>
    </body>
    

For more details, check out the Plunker. You will see that the test methods from the factories are successfully executed, indicating that the services are accessible.

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