When is it safe to use $scope.$apply()?

Question

I guess the title is pretty much clear what I am asking. I have created this fiddle : http://jsfiddle.net/Sourabh_/HB7LU/13142/

In the fiddle I have tried to replica

Answer 1

The $apply, should be used when the code is not executed in a angular digest loop. In normal circumstances we will not need to use it, but we might have to use it if we have a code that is called from a jQuery event handler or from methods like setTimeout(). Even if you have a function that is called from another angular function like a watch or angular event handlers you need not use $apply() as those scripts are executed in the digest cycle.

One safe way is to check the $scope.$$phase param before calling $scope.$apply() like

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

In your case but you can use $timeout as suggested in the another answer

• What is $$phase in AngularJS?
• Why is using if(!$scope.$$phase) $scope.$apply() an anti-pattern?