The UI does not reflect changes to the scope variable after it is updated by a service call

Question

The UI does not reflect changes to the scope variable after it is updated by a service call

When I add a new item to the scope from another service, the select tag options that come from the service do not reflect the newly inserted value immediately. The new option only appears after refreshing the page. It seems like the scope is not updating the results when its values change. Here is the code I am using:

HTML code:

<select ng-model="holidaySelected"
    ng-options="opt as opt.holidayName for opt in list_of_holidaytypes">
</select>

JS code:

$http({
    method : 'get',
    url : 'url'//url is here
}).then(function(response) {
    $scope.list_of_holidaytypes = response.data;
});

After calling another service and then calling this service again, the new option is not showing up in the UI.

javascript angularjs

Answer 1

Answer №1

Everything looks great in the code. However, I have a suspicion about the API response. Could you please let me know the exact response you are receiving from the API? It should look something like this:

$scope.list_of_holidaytypes = [{holidayName:'Name1' }, {holidayName:'Name2' }];

Answer 2

Everything looks great in the code. However, I have a suspicion about the API response. Could you please let me know the exact response you are receiving from the API? It should look something like this:

$scope.list_of_holidaytypes = [{holidayName:'Name1' }, {holidayName:'Name2' }];

Answer 3

Answer №2

It appears that the code $scope.list_of_holidaytypes = response.data; is being executed in the service, but according to Angular documentation, $scope cannot be accessed inside a service.

My recommendation is to move the code responsible for populating $scope.list_of_holidaytypes to the controller.

Here is an example:

Controller Code:

function MyCntrl($scope, MyService) {
  function successCallback(response) {
     $scope.list_of_holidaytypes = response.data;
  }

  function failureCallback(response) {
    $scope.list_of_holidaytypes = null;
  }

  $scope.fetchList = function() {
     MyService.fetchList(successCallback, failureCallback); 
  }
}

Service Code:

function Myservice($http) {
  this.fetchList = function(successCallback, failureCallback) {
    $http({
      method : 'get',
      url : 'url'//url is here 
    }).then(function(response) {
      successCallback(response);
    }, function(response) {
      failureCallback(response);
    });  
  }
}

This approach should work without any issues.

Answer 4

It appears that the code $scope.list_of_holidaytypes = response.data; is being executed in the service, but according to Angular documentation, $scope cannot be accessed inside a service.

My recommendation is to move the code responsible for populating $scope.list_of_holidaytypes to the controller.

Here is an example:

Controller Code:

function MyCntrl($scope, MyService) {
  function successCallback(response) {
     $scope.list_of_holidaytypes = response.data;
  }

  function failureCallback(response) {
    $scope.list_of_holidaytypes = null;
  }

  $scope.fetchList = function() {
     MyService.fetchList(successCallback, failureCallback); 
  }
}

Service Code:

function Myservice($http) {
  this.fetchList = function(successCallback, failureCallback) {
    $http({
      method : 'get',
      url : 'url'//url is here 
    }).then(function(response) {
      successCallback(response);
    }, function(response) {
      failureCallback(response);
    });  
  }
}

This approach should work without any issues.

Answer 5

Answer №3

I have discovered the solution. In order to update the scope variable in the UI, I am utilizing a service to retrieve the most up-to-date value of the scope variable within the service. Below is the code snippet:

Code for updating initial state:

    $scope.OnloadServiceData = function(){
           $http({
           method : 'get',
           url : 'url'//url is here
           }).then(function(response) {
           $scope.list_of_holidaytypes = response.data;
    });
};
$scope.OnloadServiceData();

Code in another controller:

 $http({
    method : 'post',
    url : 'url'//this is another service
}).then(function(response) {
    $scope.xyz= response.data;
    $scope.OnloadServiceData();//calling the service to fetch result in UI
});

Answer 6

I have discovered the solution. In order to update the scope variable in the UI, I am utilizing a service to retrieve the most up-to-date value of the scope variable within the service. Below is the code snippet:

Code for updating initial state:

    $scope.OnloadServiceData = function(){
           $http({
           method : 'get',
           url : 'url'//url is here
           }).then(function(response) {
           $scope.list_of_holidaytypes = response.data;
    });
};
$scope.OnloadServiceData();

Code in another controller:

 $http({
    method : 'post',
    url : 'url'//this is another service
}).then(function(response) {
    $scope.xyz= response.data;
    $scope.OnloadServiceData();//calling the service to fetch result in UI
});

Answer 7

Answer №4

give this a shot

try this first

let me show you how it's done

once the user calls

 vm.yourevent;

implement it now

Answer 8

give this a shot

try this first

let me show you how it's done

once the user calls

 vm.yourevent;

implement it now

The UI does not reflect changes to the scope variable after it is updated by a service call

Answer №1

Answer №2

Controller Code:

Service Code:

Answer №3

Answer №4

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