如何在angular（$ window）.bind（）中访问它？

Question

I am trying to perfom an action when a user scrolls, however I am unable to access the scope of the controller.

My code is:

(function() {
    angular.module("myApp")
        .controller("MyController", ['$window', function($window){

            this.sidebarFixed = false;  

            angular.element($window).bind("scroll", function() {
                console.log(this.sidebarFixed);
            });
    }]);
})();

The output of this is undefined . How can I access this inside the function?

Answer 1

The context of this inside the event handler is not the controller...it is window since that is what $window references

Try storing reference of controller this in variable and using that inside the event handler.

Your issue is common problem using this in javascript so storing reference is always a good practice

(function() {
    angular.module("myApp")
        .controller("MyController", ['$window', function($window){
            var vm = this; // store reference then always use variable
            vm.sidebarFixed = false;  

            angular.element($window).bind("scroll", function() {
                // `this` is `window` here
                console.log(vm.sidebarFixed);
            });
    }]);
})();