What is the reason for the directive being available in $rootScope?

Currently, there doesn't seem to be a major issue but it has sparked my curiosity.

I have a straightforward directive that, for some unknown reason, is accessible within $rootScope.

JAVASCRIPT:

(function(){

  var app = angular.module('myApp', ['m.directives']);

    app.run(function($rootScope){
    console.log($rootScope);
  });

  angular.module('m.directives', [])
  .directive('mUserSidebar', mUserSidebarDirective);

  function mUserSidebarDirective() {

    return {
      restrict: 'A',
      replace: true,
      template: "<p>{{userSidebar.date | date : 'HH:mm'}}</p>",
      controller: mUserSidebarController,
      controllerAs: 'userSidebar'
    };
  };

  mUserSidebarController.$inject = ['$interval'];

  function mUserSidebarController($interval) {

    var vm = this;
    vm.date = new Date();

    vm.logOut = function(){
      console.log('log out');
    }

    function refreshDate(){

      $interval(function(){
        vm.date = new Date();
      }, 1000);
    }

     refreshDate();
    }
})();

HTML:

<div data-ng-app="myApp">
    <p style="font-weight: bold"> directive: </p>
    <div data-m-user-sidebar></div>
    <p style="font-weight: bold; margin-top: 50px">rootScope</p>
    <div>{{$root.userSidebar}}</div>
</div>

EXAMPLE: http://jsfiddle.net/y8qgmhcw/


What's particularly intriguing is that when using it with ui-router and placing the directive:

1) Inside ui-view: The directive is not available in $rootScope

2) Outside ui-view: It is available in $rootScope


So, I have a few questions:

1) Why does this happen?

2) Am I at fault? Did I miss something? :-)

3) Is there anything I can do to prevent this behavior?

Answer №1

Finally solved it!

After realizing that the variable "scope" in my directive definition object was undefined, I corrected it to use its parent scope ($rootScope).

Therefore, the DDO should be implemented like this:

function mUserSidebarDirective() {

    return {
      restrict: 'A',
      replace: true,
      scope: true,
      template: "<p>{{userSidebar.date | date : 'HH:mm'}}</p>",
      controller: mUserSidebarController,
      controllerAs: 'userSidebar'
    };
  };

Problem fixed: http://jsfiddle.net/y8qgmhcw/1/

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