What is Resolver in Angular with Examples.

What is Resolve in Angular?

Well, essentially Resolve is a tool that allows developers to load data that’s relevant to a particular component on a specific route. It does this by resolving optional comma-delimited dependencies before it triggers a router change. This ensures that necessary data is available before entering the new route, hence the name Resolve. Essentially, Resolve is a great way to optimize your app’s load times and user experience.

Using the Resolve feature in Angular enables the preloading of data before activating a route. It serves as a valuable tool for retrieving data from an external source prior to presenting a component's content. With Resolve, data availability can be established ahead of rendering the component, preventing any empty or flashing content in the page.

How does Resolve work?

The initial step for utilizing Resolve is to establish a resolver function, which fetches the data from an outside source and relays it back to the component. Integration of the resolver function into the route definition is done within the app-routing.module.ts file.

For Examples:

DataService is responsible for pulling the data and is injected into DataResolver, which is the defined resolver function in this instance.

To update the app-routing.module.ts file, be sure to incorporate the resolver function into the route definition.

The data object in the HomeComponent matches the key of "data" in the resolve property that is added to the home component route through the resolver function.

To use the resolved data, you must update the HomeComponent.

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