The error message "Create controller with service — Get... is not a function" indicates that

Question

The error message "Create controller with service — Get... is not a function" indicates that

Within my ASP.NET Boilerplate project, the following code snippet is present:

(function () {
    appModule.controller('augustinum.views.kostenstelle.index', [
        '$scope', '$uibModal', 'abp.services.app.kostenstelle',
        function ($scope, kostenstelleService) {
            var vm = this;
            
            vm.kostenstellen = [];
            
            vm.getKostenstelle = function () {
                kostenstelleService.getKostenstelle().then(function (result) {
                    vm.kostenstellen = result.items;
                    console.log("Step1" + vm.kostenstellen.length);
                });
            };
            
            vm.getKostenstelle();   
            console.log("Step2" + vm.kostenstellen.length);
        }
    ]);
})();

There are two queries that I have:

An error message is displayed:

getKostenstelle() is not a function.

If I substitute
```
kostenstelleService.getKostenstelle()
```
with
```
abp.services.app.kostenstelle.getKostenstelle()
```
, the code functions correctly — the object list Kostenstelle is retrieved. Nonetheless, I believe I lose the scope with this workaround. Therefore, what is the issue with the kostenstelleService?
Upon successful code execution (after replacing kostnestelleService), the array kostenstelle[] contains 2 items. In the line with "Step1", the accurate count of 2 items is displayed. However, at the line with "Step2", 0 elements are shown. Why is this the case? Moreover, how can I modify the code so that the line with "Step2" is executed when the array is populated?

Thanks in advance for any guidance.

javascript asp.net angularjs angularjs-scope asp.net-boilerplate

Answer 1

Answer №1

1) The reason for the error is because the $uibModal was not included in the

function ($scope, kostenstelleService) {

(line 4). This causes kostenstelleService to point to $uibModal.

The correct code should be:

appModule.controller('augustinum.views.kostenstelle.index', 
    ['$scope', '$uibModal', 'abp.services.app.kostenstelle',
    function ($scope, $uibModal, kostenstelleService) {

2) The issue arises because getKostenstelle() is an asynchronous operation wrapped in a promise. JavaScript being single threaded processes each operation one at a time and places async operations in a pending queue to prevent thread lock.

Here's what happens in your case:

Execute vm.getKostenstelle()
- Execute
```
kostenstelleService.getKostenstelle()
```
  and place it in the pending queue
Execute
```
console.log("Step2" + vm.kostenstellen.length);
```
- At this point, vm.kostenstellen.length is empty because the async call has not finished
Asynchronous call
```
kostenstelleService.getKostenstelle()
```
completes
- The .then block is executed; data is assigned to vm.kostenstellen and
```
console.log("Step1" + vm.kostenstellen.length);
```
  displays the data

Answer 2

1) The reason for the error is because the $uibModal was not included in the

function ($scope, kostenstelleService) {

(line 4). This causes kostenstelleService to point to $uibModal.

The correct code should be:

appModule.controller('augustinum.views.kostenstelle.index', 
    ['$scope', '$uibModal', 'abp.services.app.kostenstelle',
    function ($scope, $uibModal, kostenstelleService) {

2) The issue arises because getKostenstelle() is an asynchronous operation wrapped in a promise. JavaScript being single threaded processes each operation one at a time and places async operations in a pending queue to prevent thread lock.

Here's what happens in your case:

Execute vm.getKostenstelle()
- Execute
```
kostenstelleService.getKostenstelle()
```
  and place it in the pending queue
Execute
```
console.log("Step2" + vm.kostenstellen.length);
```
- At this point, vm.kostenstellen.length is empty because the async call has not finished
Asynchronous call
```
kostenstelleService.getKostenstelle()
```
completes
- The .then block is executed; data is assigned to vm.kostenstellen and
```
console.log("Step1" + vm.kostenstellen.length);
```
  displays the data

The error message "Create controller with service — Get... is not a function" indicates that

Answer №1

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