Oops! An issue occurred: Attempting to access 'handle' property of an undefined value

Within my application, I've developed two distinct components: the Selector Component and the Shifter Component. The Selector Component is responsible for selecting a list of items that require updating, and it triggers a method in the Shifter Component to carry out the actual item updates. The Selector Component connects to a service, which then executes a URL using the HTTP Get method to retrieve the list of items for updating. I'm displaying the selected items as hyperlinks, and when an item is clicked, a method in the Shifter Component is called. This method interacts with a service, which, in turn, utilizes the HTTP Patch method to update the selected item.

Throughout this process, an error is occurring:

core.js:6014 ERROR TypeError: Cannot read property 'handle' of undefined

Below is the code for my Selector Component:

(code snippet removed for brevity)

And here is the code for my Shifter Component:

(code snippet removed for brevity)

Lastly, here are the details for my Shifter Service:

(code snippet removed for brevity)

I suspect the issue may be related to how I'm initializing the HttpClient in the SelectorComponent. Any assistance in resolving this issue would be greatly appreciated.

Answer №1

Make sure to include the HttpClient initialization in the constructor, similar to how it's done in SelectorComponent for SelectorService.

export class SelectorComponent implements OnInit {
    constructor(private _selectorService: SelectorService,
         private httpC: HttpClient){}

Angular will automatically handle the dependencies for you through Dependency Injection based on these parameters. If you encounter an error such as

Cannot find provider for HttpClient
, simply import HttpClientModule in your AppModule.

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