Troubleshooting the issue of Angular 2 error: Cannot access the 'getOptional' property

Currently, I am navigating my way through angular 2 and attempting to define a service named searchservice. I want to inject this service in the bootstap part of my project:

import {SearchService} from 'src/service';

Here is the code for the SearchService:

import {Injectable} from 'angular2/core';
import {URLSearchParams, Jsonp} from 'angular2/http';

@Injectable()
export class SearchService {
  constructor(private http: Http) {}

  search (name: string) {
        http.get('https://api.spotify.com/v1/search?q='+name.value+'&type=artist')
        .map(response=>response.json());
  }
}

However, I am facing an error when running the application. Could you please assist me in resolving this issue?:

VM337 angular2-polyfills.js:138 Error: Cannot read property 'getOptional' of undefined
    Error loading http://run.plnkr.co/fGkpQYXMc0eGUy6e/src/boot.ts
    at _runAppInitializers (https://cdnjs.cloudflare.com/ajax/libs/angular.js/2.0.0-beta.0/angular2.dev.js:14832:25)
    at PlatformRef_._initApp (https://cdnjs.cloudflare.com/ajax/libs/angular.js/2.0.0-beta.0/angular2.dev.js:14813:7)
    at PlatformRef_.application (https://cdnjs.cloudflare.com/ajax/libs/angular.js/2.0.0-beta.0/angular2.dev.js:14768:22)
    at Object.bootstrap (https://cdnjs.cloudflare.com/ajax/libs/angular.js/2.0.0-beta.0/angular2.dev.js:25054:64)
    at execute (http://run.plnkr.co/fGkpQYXMc0eGUy6e/src/boot.ts!transpiled:60:23)
    at u (https://rawgit.com/systemjs/systemjs/0.19.6/dist/system.js:5:97)
    at Object.execute (https://rawgit.com/systemjs/systemjs/0.19.6/dist/system.js:5:3188)
    at y (https://rawgit.com/systemjs/systemjs/0.19.6/dist/system.js:4:9948)
    at w (https://rawgit.com/systemjs/systemjs/0.19.6/dist/system.js:4:10327)

plunkr ref:http://plnkr.co/edit/F6TSGfyRnR5jvbpiv2QJ?p=preview
angularjstypescriptangular

Answer №1

The critical aspect of the issue lies in the line preceding the one you mentioned, specifically:

Cannot resolve all parameters for SearchService(?). Ensure they are of valid type or have annotations.

In your search service, you are attempting to declare a variable of type Http, but you have not imported Http into the service.

To rectify this, modify the import statement to: 

import {URLSearchParams, Jsonp, Http} from 'angular2/http';
.

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