How to call a function from another controller in AngularJS?

I need to call a function in another controller in AngularJS. How can I do this?

Code:

app.controller('One', ['$scope',
    function($scope) {
        $scope.parentmethod = function() {
            // task
        }
    }
]);

app.controller('two', ['$scope',
    function($scope) {
        $scope.childmethod = function() {
            // Here i want to call parentmethod of One controller
        }
    }
]);

Communication between controllers is done though $emit + $on / $broadcast + $on methods.

So in your case you want to call a method of Controller "One" inside Controller "Two", the correct way to do this is:

app.controller('One', ['$scope', '$rootScope'
    function($scope) {
        $rootScope.$on("CallParentMethod", function(){
           $scope.parentmethod();
        });

        $scope.parentmethod = function() {
            // task
        }
    }
]);
app.controller('two', ['$scope', '$rootScope'
    function($scope) {
        $scope.childmethod = function() {
            $rootScope.$emit("CallParentMethod", {});
        }
    }
]);

While $rootScope.$emit is called, you can send any data as second parameter.

I wouldn't use function from one controller into another. A better approach would be to move the common function to a service and then inject the service in both controllers.

You may use events to provide your data. Code like that:

app.controller('One', ['$scope', function ($scope) {
         $scope.parentmethod=function(){
                 $scope.$emit('one', res);// res - your data
         }
    }]);
    app.controller('two', ['$scope', function ($scope) {
         $scope.$on('updateMiniBasket', function (event, data) {
                ...
         });             
    }]);

If the two controller is nested in One controller.
Then you can simply call:

$scope.parentmethod();  

 

Angular will search for parentmethod function starting with current scope and up until it will reach the rootScope.

The best approach for you to communicate between the two controllers is to use events.

See the scope documentation

In this check out $on, $broadcast and $emit.

If you would like to execute the parent controller's parentmethod function inside a child controller, call it:

$scope.$parent.parentmethod();

You can try it over here