I have wrriten some sample in [plunker](http://plnkr.co/edit/cA8Stcww0mMWKTvEV1ut?p=preview). I need to validate my input when the user leaves it. I used `ng-model-options="{ updateon: 'blur'}"` for this. `ng-minlength` works fine but this doesn't apply to the `ng-required` validation.