angularjs prevent double click/double submit

prevent-doubleclick.js

$scope.flag = false;
$scope.buttonClicked = function() {
    if ($scope.flag) {
        return;
    }
    $scope.flag = true;
    Service.doService.then(function(){
        //this is the callback for success
        $scope.flag = false;
    }).error(function(){
        //this is the callback for the error
        $scope.flag = false;
    })
}