What's the alternative for $rootScope in Angular 2?

I am currently developing a demo application using Angular 2, and I have encountered a problem. I need to utilize a global variable or object across the entire application similar to $rootScope in Angular. Could you please provide me with some suggestions on how I can achieve this? Right now, I am using EventEmitter.

app.component.ts:

<a routerLink="/admin" routerLinkActive="active" style="float:right;"
    *ngIf="currentUrl != '/admin'" (adminUrl)="setUrl($event)"  >Admin-{{currentUrl}}</a>

 `@Output()  adminUrl:String;`

heroes.component.ts:

  @Output() adminUrl = new EventEmitter();
  this.adminUrl.emit(this.router.location.path());

The above code snippet is just a part of the overall implementation to illustrate my approach towards achieving the desired functionality.

angulartypescript

Answer №1

If you want to create a global variable/object that can be accessed throughout your app, you can utilize the localStorageService. To start, add the localStorage package to your project:

npm install angular-2-local-storage

Next, import it into your baseComponent (if applicable):

import { LocalStorageService } from 'angular-2-local-storage';

Then, inject it into the constructor of BaseComponent:

constructor(protected localStorageService: LocalStorageService)

You can set and retrieve values using localStorageService like this:

this.localStorageService.set('sessionData',{Object});

To retrieve the value:

 this.sessionDetails = this.localStorageService.get('sessionData');

For more information on how to use localStorageServices, refer to the link below:

https://www.npmjs.com/package/angular-2-local-storage

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