How to access angularJS controller as variables?

Question

How to define the value for controller as elements inside custom directive link function?

HTML

<div ng-controller="myCtrl as ctrl">
   <input type="text" ng-model=ctrl.inputvalue" my-directive/>
   <button value="submit" ng-disabled="ctrl.disable"/>
</div>

JS

app.controller('myCtrl',function(){
    var vm = this;
    vm.inputValue = 'Qwerty';
});
app.directive('myDirective',function(){
    return{
        require:'ngModel',
        link:function(scope,elements,ngModelCtrl){
        //How to access ng-diasbled value here
        });
    }    
});

Answer 1

Inside link function write as scope.ctrl.disable to access the disable value.