Adding data-dismiss="modal" on any buttons in my modal worked for me. I wanted my button to call a function with angular to fire an ajax call AND close the modal so I added a .toggle() within the function and it worked well. (In my case I used a bootstrap modal and used some angular, not an actual modal controller).
<button type="button" class="btn btn-primary" data-dismiss="modal"
ng-click="functionName()"> Do Something </button>
$scope.functionName = function () {
angular.element('#modalId').toggle();
$.ajax({ ajax call })
}