How to use the useFetcher hook in React router
The useFetcher hook is a React Router hook that lets you plug your UI into your actions and loaders without navigating. The useFetcher hook handles fetch cancellation, prioritizes submission actions, automatically revalidates data, manages concurrent fetches, handles errors, and supports app redirection based on action/loader redirects.
Additionally, the useFetcher hook provides the following properties:
fetcher.state: Represents the state of the fetcher (idle, submitting, loading).fetcher.Form: Similar to the<Form>component but without causing navigation.fetcher.load(): Loads data from a route loader.fetcher.submit(): An imperative version of<fetcher.Form>for programmatic fetch initiation.fetcher.data: Stores the returned data from the loader or action.fetcher.formData: Provides access to form data for building optimistic UI.fetcher.formAction: Gives you the action URL that the form is being submitted to.fetcher.formMethod: Indicates the method of the form being submitted (GET,POST,PUT,PATCH,DELETE).
The useFetcher hook is useful for:
Fetching data for non-UI elements like popovers or dynamic forms.
Submitting data without navigating to a new page.
Handling multiple simultaneous submissions and implementing infinite scroll containers.
Here is an example of how to use the useFetcher hook:
Below is a quick explanation of the code:
Line 1: We imported the
useFetcherfunction from the "react-router-dom" library.Line 4: We invoked the
useFetcherfunction and assigned its returned value to thefetchervariable.Line 8: We displayed the current state of the
fetcherusing{fetcher.state}.
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