Add custom validation to ngModel (useful in forms) | AngularJs

ng-validation

app.directive('ngValidation', function () {
    return {
        require: 'ngModel',
        scope: {
            ngValidation: '='
        },
        link: function (scope, element, attrs, ngModel) {
            scope.$watch('ngValidation', function (newVal) {
                if (!(newVal instanceof Object)) return;
                if (!(newVal instanceof Array)) newVal = [newVal];

                angular.forEach(newVal, function (item) {
                    ngModel.$setValidity(item.name, item.value);
                });

            }, true);
        }
    }
});
    
-------------------

UseCase:
<form name="frm">
    <input type="number" name="number" ng-model="model" required ng-validation="[{name: 'byTwo', value: model%2==0}, {name: 'byFive', value: model%5==0}]" />
    <div ng-messages="frm.number.$error" multiple>
        <div ng-message="required">input is required !!</div>
        <div ng-message="byTwo">input is not divisible by 2 !!</div>
        <div ng-message="byFive">input is not divisible by 5 !!</div>
    </div>
</form>