Angular JS, update $scope from controller in directive

Question

I have the following situation:

In my app I have a quiz, I store the score and the current question as $scope.current , $scope.score in MainCtrl , then I have a directive called question where I show the question and the choices like:

angular.module('quiz')
    .directive('myQuestion', function() {
        return {
            restrict: 'EA',
            replace: true,
            scope: {
                question: '=',
                index: '='           
            },

        link: function(scope) {



            scope.validate = function(index) {
                var isCorrect = index === scope.question.correct;

                if(isCorrect) {
                    console.log('Correct!');


                    //$scope.score += 10 ($scope score from MainCtrl)

                }

                if(!isCorrect) {
                    console.log('Incorrect!');

                    scope.correct = false;
                }

                //$scope.current += 1;

            };


            templateUrl: 'assets/javascript/tpl/question.html'
        };
    });

In my html I have the following structure:

<div class="quiz">

<h2>Current Question: {{current}}</h2>
<h2>Your score: {{score}}</h2>

<my-question ng-repeat="q in questions track by $index"
             ng-if="isCurrent($index)" //in controller i compare $index with $scope.current
             question="q"
             index="$index"></my-question>

</div>

My question is, how can I update $scope.score or $scope.current from the directive link function?

Can someone explain me please the best way?

Answer 1

In the case where you have directive and want to update parent controller scope I think it would be best to use model with a dot .

For that you need to change model a bit in parent controller

$scope.quiz = {
  score: 0
  current: 0
}

then in directive you can do

$scope.quiz.score = 'whatever, really'
$scope.quiz.current = 'current index'

if you refer to a model like that quiz.score then it will not create score on current scope but instead it will find parent model quiz and change the score

Hope that makes sense