Utilizing HttpClient in a static method service with Angular

One of my services contains a static method that I use for some initialization treatment.

Within this method, I need to retrieve data from a web service

    @Injectable()
    export class FeaturesInitializationService {

      static allowedFeaturesModules: any = FeaturesInitializationService.featuresFilter();
      public httpClient : HttpClient ;

      constructor() {
      }

      static featuresFilter() {


// It is not permissible to use "this.httpClient" here
       this.httpClient.get('myUrl').subscribe(    
          ( data ) => {
            console.log(data);
          }
        );
        const testPef = true;
        const featuresList = [];
        if (testPef === true) {
          featuresList.push(MenusModule);
        } else {
          featuresList.push(ChangelogModule);
        }
        return featuresList;
      }
    }

In this scenario, using this.httpClient is prohibited within the static method

Any suggestions on how to approach this?

Answer №1

When it comes to static methods, they are distinctly different from instance methods. In the context of a static class, this would only pertain to static class properties. On the other hand, for non-static classes, this refers to an instance of a class such as when accessing httpClient, which is not static and therefore does not exist in a static property.

If you were to make httpClient static, Angular would no longer be able to inject it into the service instance.

The design choice of requiring this method to be static prompts some reflection on your part. Services within Angular are typically created as instances, and it's rare to encounter a situation where a call to httpClient would need to be made outside the accessibility provided by Angular's Dependency Injection system.

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