javascript - Angular directive isolate scope: scope function won't execute -

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i'm having trouble understanding how define functions used (or inside of) directive has isolate scope. in following code, why doesn't $scope.foo() function execute? there correct way should approaching problem? i'm looking make button visible if user logged in, , thinking directive nice way encapsulate/isolate functionality.

<!doctype html> <html>  <head>   <script src="https://code.angularjs.org/1.4.2/angular.js"></script>   <script>     angular.module('myapp', [])       .directive('myscopeddirective', function() {         return {           scope: {}, // <!-- isolate scope breaks things           controller: function($scope) {             // isolate scope prevents function being executed             $scope.foo = function() {               alert('myscopeddirective / foo()');             };           }         };       });   </script> </head>  <body>   <div ng-app="myapp">     <!-- button doesn't work unless isolate scope removed -->     <button my-scoped-directive ng-click="foo()">directive container - foo()</button>   </div> </body>  </html>

plunker: http://plnkr.co/edit/sm81szfdltrzitismog6

it's not working because using 2 directives in different scopes, ngclick , myscopeddirective. need create template directive , call click function so:

<!doctype html> <html>  <head>   <script src="https://code.angularjs.org/1.4.2/angular.js"></script>   <script>     angular.module('myapp', [])       .directive('myscopeddirective', function() {         return {           restrict: 'ae', // can defined element or attribute           scope: {},           // call click function directive template           template: '<button ng-click="foo()">directive container - foo()</button>',           controller: function($scope) {             $scope.foo = function() {               alert('mydirective / foo()');             };           }         };       });   </script> </head>  <body>   <div ng-app="myapp">     <my-scoped-directive></my-scoped-directive>   </div> </body>  </html>

working plunker


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