Updating the view in AngularJS with a service to keep users engaged even when they are offline

I'm currently developing an application that requires the ability to detect when a user loses internet connection or is unable to reach the server. Various controllers and services should be able to check and update this status easily. I have successfully implemented this functionality using an angular service along with:

window.addEventListener('offline', function() {OfflineService.checkIfOnline});

where the service handles the logic like:

window.navigator.onLine ? online = true : online = false

The challenge arises when I need to reflect this change in the view once the offline event is triggered. I've been struggling to find a way to dynamically update the scope property or controller property whenever the service property is updated by the event.

Upon using $scope.$watch, the designated function seems to execute 10 times initially (as logged in the console) but does not trigger again thereafter.

I attempted to recreate the issue in a jsfiddle, although it's my first time working with this tool and I am unsure if it was done correctly:

https://jsfiddle.net/m3nx5yLm/1/

Any guidance you could provide would be greatly appreciated!

Answer №1

Appreciation to all who contributed their assistance.

Ultimately, I opted for a recommendation from a friend. Implementing

$rootScope.$emit('offlineEvent' true);
within the service and monitoring it in the controller using
$rootScope.$on('offlineEvent' this.setControllerProperty);
.

Answer №2

https://example.com/code123

constructor($scope, OfflineNotificationService){

It seems like the issue stemmed from referencing the class from the scope instead of the instance created by the injector (remember to pass it in along with $scope). The watch syntax was utilized for clarity in making the call, while the string syntax is typically reserved for referencing properties on scope. You can simplify the code by just returning window.navigator.onLine and storing the value on the service instance for direct reference in the view. To check online status periodically, consider using a $timeout loop or listening for online/offline events on the browser instead of relying on the watch function.

https://example.com/code456

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