<a class="waves-effect waves-light btn" my-directive="" on-flag="someFunction" question-id="question">Flag</a>

angular.module('myApp').directive('myDirective', function($http) {
  return {
    restrict: 'A',
    scope: {
      onFlag: '&onFlag',
      questionId: '='
    },
    link: function(scope, element, attrs) {
      return element.click(function() {
        console.log(scope);
        console.log(scope.questionId);
      });
    }
  };
});