How to utilize an AngularJS filter within a controller

Having a root controller in my AngularJS web application with a filter. The filter functions properly when applied in the html template, but it fails to work when attempted to be applied in the controller.

function Controller ( ... deps ...) {
    filter = $filter('my_filter');
    $scope.$apply(function(){$scope.error_message =  filter('ERROR');});
}

The filter should simply return an error string to the <p>, but for some reason, it's not working.

If I do:

<p>{{'....' | my_filter}}</p>

It works perfectly fine. Why is that?

Thank you.

javascriptangularjsfilter

Answer №1

Avoid enclosing 

$scope.error_message =  filter('ERROR');
within $scope.$apply as it will lead to an error due to the Controller being executed during a digest cycle.

Here's the correct approach:

function Controller ($filter ... other deps ...) {
  var filter = $filter('my_filter');
  $scope.error_message =  filter('ERROR');
}

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