how i can set ng-drity for the checkbox checked via angular

So, I need help with one thing, when i check the checkbox via angular/dom

angular.element(document.getElementById('check' + match).checked = true);

in html dont change the status for ng-drity. after checked via element/dom.

<input type="checkbox" id="check6" ng-change="add(role)" ng-model="form.checkId[role.id]" class="ng-pristine ng-untouched ng-valid ng-empty">

how i can set ng-drity for the checkbox checked.

CODE