How to call an application controller method from

Hi I want to make a validation directive. It basically will call a remote validation on the server. I would expect something like this:

<input type="text" id="nome" required ng-model="client.context" available="checkAvailableContexts">

and that should call a method on my ClientController like this:

$scope.checkAvailableContexts = function(contexto, callbacks) {
    service.checkContextAvailability(contexto, callbacks);
}

and this is my service method:

this.checkContextAvailability = function(context, externalCallbacks) {
 var url = angular.url("/clients/context/" + context + "/available"),
     callback = {
         success: function(){},
         error: function(){}
     };

 $.extend(callback, externalCallbacks)
 $.ajax({
     url: url,
     data: { context: context },
     success: function(data){
         $timeout(function(){
             callback.success(data); 
         },100);
     },
     type: "GET",
     dataType: "json",
     contentType: "application/json;charset=UTF-8onte"   
 });
};

my directive is something like this:

.directive('available', function(){
  return {
      restrict: "A",
      require: "ngModel",
      replace: true,
      link: function(scope, element, attrs, controller){
          controller.$parsers.unshift(function (viewValue) {
                          //call the ClientsController method passing viewValue
                          //and callbacks that update the validity of the context
          })
      }
  }
})

But I can't figure out how to call the clientController from inside the directive.

I know I have attrs.available as the name of the function. But I can't execute it on the controller scope passing my parameters;

Any help would be much appreciated!

You don't need to call the control, you just need to share variables with it.

What you can do is share an object with the directive, like:

<input type="text" id="nome" 
 required ng-model="client.context" 
 available="availableOpts">

At your scope, you add a variable with shared vars, like:

$scope.availableOpts = {
   check: checkAvailableContexts,
   context: ...;
   callbacks: ...;
}

At you directive, you get it at the scope:

.directive('available', function(){
return {
  restrict: "A",
  require: "ngModel",
  replace: true,
  scope: {available: "="}
  link: function(scope, element, attrs, controller){

  // At this point, you have an variable at directive scope, that is shared
  // with the controller, so you can do:
  scope.available.check(scope.availabe.context, scope.available.callbacks);
  // the controler will have now a var $scope.availableOpts.result
  // with the return of the function tha you call

  }
 }
})