Require checkbox angularjs

angular-required-checkbox

// HTML
<input type="checkbox"
       name="windowStyle[]"
       ng-model="data.windowStyle.singleHung"
       ng-true-value="'Single Hung'"
       ng-required="!someSelected(data.windowStyle)">

// JS
$scope.someSelected = function (object) {
    return Object.keys(object).some(function (key) {
        return object[key];
    });
};