Reconcile Angular.js and Bootstrap form validation styling

Question

I am using Angular with Bootstrap. Here is the code for reference:

Answer 1

Minor improvement to @Andrew Smith's answer. I change input elements and using require keyword.

.directive('showValidation', [function() {
    return {
        restrict: "A",
        require:'form',
        link: function(scope, element, attrs, formCtrl) {
            element.find('.form-group').each(function() {
                var $formGroup=$(this);
                var $inputs = $formGroup.find('input[ng-model],textarea[ng-model],select[ng-model]');

                if ($inputs.length > 0) {
                    $inputs.each(function() {
                        var $input=$(this);
                        scope.$watch(function() {
                            return $input.hasClass('ng-invalid');
                        }, function(isInvalid) {
                            $formGroup.toggleClass('has-error', isInvalid);
                        });
                    });
                }
            });
        }
    };
}]);