How to check if the Radio option is selected?

Question

Angular

In the form, you need to check if radio is selected, with text, select, nuber, figured it out, but with radio, no way.
Actually the code.

<div>
    <label>Уровень сотрудника</label>
    <input type="radio" name="level" value="1" id="level-1" ng-model="workpeople.level"/> <label for="level-1" required="">1</label>
    <input type="radio" name="level" value="2" id="level-2" ng-model="workpeople.level"/> <label for="level-2" required="">2</label>
    <input type="radio" name="level" value="3" id="level-3" ng-model="workpeople.level"/> <label for="level-3" required="">3</label>
</div>
<div>
    <label>Семейное положение</label>
    <input type="radio" name="pokemon" value="1" id="married-1" ng-model="workpeople.isMarried"><label for="married-1">В браке</label>
    <input type="radio" name="pokemon" value="0" id="married-0" ng-model="workpeople.isMarried"><label for="married-0">Не в браке</label>
</div>
<div>
    <label>Наличие фотоаппарата</label>
    <input type="radio" name="photo" value="1" id="photo-1" ng-model="workpeople.isPhoto"/> <label for="photo-1">Есть</label>
    <input type="radio" name="photo" value="0" id="photo-0" ng-model="workpeople.isPhoto"/> <label for="photo-0">Нет</label>
</div>
<div>
    <label>Наличие интернета</label>
    <input type="radio" name="internet" value="1" id="internet-1" ng-model="workpeople.isInternet"/> <label for="internet-1">Есть</label>
    <input type="radio" name="internet" value="0" id="internet-0" ng-model="workpeople.isInternet"/> <label for="internet-0">Нет</label>
</div>

That is, if all Radios are unchecked, the form remains ng-invalid.

Answer 1

You can simply set the default value of the scope.