AngularJS Custom Directive Two Way Binding

Question

If I have an AngularJS directive without a template and I want it to set a property on the current scope, what is the best way to do it?

For example, a directive tha

Answer 1

Change template to:

Click Me
Click Count: {{ counter.val }}

and directive to:

.directive('twoway',
    function() {
        return {
            scope: {
                localValue: '=?bind'
            },
            link: function(scope, elem, attrs) {
                scope.localValue = {
                    val: 0
                };
                elem.on('click', function() {
                    scope.localValue.val = scope.localValue.val + 1;
                    scope.$apply();
                });
            }
        };
    }
);