Original implementation of directive message, contains only error message

notificationBar.js

.directive("notificationBar", function () {
    return {
        transclude: false,
        require: '^ngModel',
        templateUrl: 'notificationBar/template.html',
        scope: {
            displayMessage: '@'
        },
        controller: function ($scope){
            $scope.showMessage = function() {
                return $scope.displayMessage.length > 0;
            }
        }
    }
});

template.html

<div ng-show="showMessage()" class="Response Error">
    <i class="icon-remove"></i> <span class="i-name">{{displayMessage}}</span>
</div>