Limit the number that user introduce in an input text

maxNumber.js

app.directive('maxNumber', function () {
    return {
        require: 'ngModel',
        link: function (scope, element, attr, ngModelCtrl) {
            function fromUser(text) {
                var maxN = parseInt(attr.maxNumber);
                if (text) {
                    if(parseInt(text) > maxN){
                      ngModelCtrl.$setViewValue(maxN);
                      ngModelCtrl.$render();
                    }
                    return maxN;
                }
                return undefined;
            }
            ngModelCtrl.$parsers.push(fromUser);
        }
    };
});