Answer by Sagar M for AngularJS : Prevent error $digest already in progress when calling $scope.$apply()

First of all, don’t fix it this way

if ( ! $scope.$$phase) { 
  $scope.$apply(); 
}

It does not make sense because $phase is just a boolean flag for the $digest cycle, so your $apply() sometimes won’t run. And remember it’s a bad practice.

Instead, use $timeout

    $timeout(function(){ 
  // Any code in here will automatically have an $scope.apply() run afterwards 
$scope.myvar = newValue; 
  // And it just works! 
});

If you are using underscore or lodash, you can use defer():

_.defer(function(){ 
  $scope.$apply(); 
});