Facing a 'No provider for' error in my Angular 2.0.0 application

I recently developed a service called SecurityService to handle authentication. Check out the code for this service below:

import { Injectable } from '@angular/core';

@Injectable()
export class SecurityService {
    items: any[];

    constructor() {
        this.items = [
            { name: 'User 1' },
            { name: 'User 2' },
            { name: 'User 3' }
        ];
    }

    getItems() {
        return this.items;
    }
}

To implement and use this service, I created a simple page as well.

import { Component } from '@angular/core';
import { SecurityService } from '../services/security.service'

@Component({
    selector: 'test-page',
    template: require('./test/test.page.html'),
    providers: [SecurityService]
})
export class TestPage {
    items: any[];

    constructor(private securitySvc: SecurityService) {
          this.items = securitySvc.getItems();
    }
}

However, upon loading the page, I encountered an error stating "No provider is given for SecurityService!". After extensively researching this issue, I haven't been able to find a solution yet.

If you need further information to assist in resolving this problem, please let me know.

Your help and insights are highly valued.

  • sroye98

Answer №1

After rebuilding the application in Visual Studio 2015, I noticed a significant improvement in its functionality. It seems that there may have been some issues with Visual Studio itself, as kemsky pointed out that the code was solid.

Answer №2

In addition to what you've already shown, it's important to register the services at the module level as well:

import { NgModule } from '@angular/core';
import { BrowserModule }  from '@angular/platform-browser';
import { HttpModule } from '@angular/http';

import { ConfigurationService } from './services/configuration.service';

@NgModule({
  imports: [
    BrowserModule,
    HttpModule
  ],
  declarations: [  
    //...
  ],
  providers: [
    ConfigurationService
  ],
  bootstrap: [ AppComponent ]
})
export class AppModule { }

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