AngularJs $scope functions similarly to a local variable

Having an issue that needs addressing.

app.controller('groupConfigCntrl', ['$http', '$scope', '$routeParams', function($http, $scope, $routeParams){

            var id = $routeParams.id,
                info = {};
            $http.post("/g/getGroup/", {id: id}).success(function(data) {
              $scope.info = data;
            });
              console.log($scope.info); 
    });

The problem at hand is that $scope.info appears to be undefined.

        $http.post("/g/getGroup/", {id: id}).success(function(data) {
          $scope.info = data;
          console.log($scope.info); 
        });

In this instance, $scope.info does contain some data. Wondering why $scope behaves like a local variable? Seeking help as the binding of data in views is not functioning properly. However, it works in a similar controller.

Working Controller:

app.controller('groupCntrl', ['$http', '$scope', '$uibModal', '$routeParams', '$location', function($http, $scope, $uibModal, $routeParams, $location){
    var id = $routeParams.id;
    $http.post("/g/getGroup/", {id: id}).success(function(data) {
      $scope.info = data;
    });
})

Answer №1

The reason behind this issue is the usage of callback. In the initial scenario, when you use console.log, it is executed before the callback function is returned, leading to $scope.info being undefined at that moment. To resolve this problem and obtain the intended outcome, follow these instructions:

app.controller('groupConfigCntrl', ['$http', '$scope', '$routeParams', function($http, $scope, $routeParams){

            var id = $routeParams.id,
                info = {};
            $http.post("/g/getGroup/", {id: id}).success(function(data) {
              $scope.info = data;
              console.log($scope.info); 
            });

    });
 

If you wish to comprehend how callback functions in JavaScript, you can explore nexttick. For example:

Answer №2

Consider this scenario in which the .success() method acts as a callback function. Upon completion of the post method, this callback is executed asynchronously.

Due to this asynchronous nature, it is possible that in your initial example, the $scope.info value might not have been assigned yet when you attempt to log the output.

Based on your comments, it appears that the issue you're facing revolves around the view not updating when the $scope.info value is set. In such cases, you should ensure to encapsulate your callback within the $apply method.

$http.post("/g/getGroup/", {id: id}).success(function(data) {
  $scope.$apply(function(){
    $scope.info = data;
  });
});

Answer №3

After the $http post request has been successfully completed, the variable $scope.info is defined within the success callback.

$http.post("/g/getGroup/", {id: id}).success(function(data) {
              $scope.info = data;
              console.log($scope.info); 
            });

It is important to note that trying to access $scope.info before the $http call will result in it being undefined.

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