Transferring information between a service and a controller

I'm struggling to pass data between a service and a controller in my AngularJS project.
Even though I've followed the recommended steps, the code is not functioning as expected.

Below is the controller snippet:

function udpController($scope,$interval,udpService) {
    $scope.status = udpService.status;
    $interval(function(){udpService.changeStatus();},2500);
}

And here is the corresponding service section:

angular.module('udpTest').service('udpService' ,function() {
        var self = this;
        this.status;

        this.changeStatus = function() {
                self.status = Math.random();
        }
}

The $scope.status remains unchanged despite the implemented logic.
Appreciate any guidance on resolving this issue.

Answer №1

In this scenario, the value is being assigned first and then the function called within $interval may not be aware that the value of $scope.status needs to be updated. To ensure proper updating, you must include this logic inside the function as shown below:

function updateController($scope,$interval,updateService) {

    $interval(function(){
       updateService.updateStatus();
       $scope.status = updateService.status;
   },2500);
}

Answer №2

Your $scope value has already been updated to undefined, because the $interval is called after all the functions in the stack.

$interval(function(){udpService.changeStatus();},2500);

Please update the code as follows:

$interval(function(){udpService.changeStatus();$scope.status = udpService.status; },2500);

If udpService.changeStatus() is an asynchronous call, it would be more appropriate to utilize the $q service with promises (resolved, rejected);

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