How to Facilitate Communication Between Sibling Components in Angular 2?

Sibling Component Communication in Angular 2

When working with components that are siblings, it can be necessary to communicate information between them. There are several ways to approach this with Angular 2, including using an event emitter and @Input, utilizing a shared service with observable subscriptions, or leveraging the hierarchical dependency injection system.

Event Emitter and @Input

One option is to use event emitters to pass data up to a parent component and then use @Input decorators on the detail component to receive the data. However, this approach may be less desirable if additional code needs to be executed upon item selection.

Shared Service with Observable Subscriptions

Another method involves creating a shared service that provides observable subscriptions. When an item is clicked, the shared service can be updated, triggering the required updates in sibling components. This approach allows for more flexibility and control over the communication process.

Dependency Injection in Parent Component

Updated for Angular rc.4:

For a more straightforward solution, consider using Angular 2's hierarchical dependency injection system. By providing the shared service in the parent component, both child components have access to it through their constructors. This enables direct communication between the siblings, providing a clean and efficient method for data exchange.

To illustrate this approach:

• Create a SharedService that holds the data to be shared.
• In the parent component, include the SharedService as a provider and inject it into the constructor.
• In the sibling components, import the SharedService and inject it into the constructor.
• Modify the child component to access and manipulate the shared data as needed.

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