useFetcher

Summary

Useful for creating complex, dynamic user interfaces that require multiple, concurrent data interactions without causing a navigation.

Fetchers track their own, independent state and can be used to load data, submit forms, and generally interact with action and loader functions.

import { useFetcher } from "react-router"

function SomeComponent() {
  let fetcher = useFetcher()

  // states are available on the fetcher
  fetcher.state // "idle" | "loading" | "submitting"
  fetcher.data // the data returned from the action or loader

  // render a form
  <fetcher.Form method="post" />

  // load data
  fetcher.load("/some/route")

  // submit data
  fetcher.submit(someFormRef, { method: "post" })
  fetcher.submit(someData, {
    method: "post",
    encType: "application/json"
  })

  // reset fetcher
  fetcher.unstable_reset()
}

Signature

function useFetcher<T = any>({
  key,
}: {
  key?: string;
} = ): FetcherWithComponents<SerializeFrom<T>> {}

Params

options.key

A unique key to identify the fetcher.

By default, useFetcher generates a unique fetcher scoped to that component. If you want to identify a fetcher with your own key such that you can access it from elsewhere in your app, you can do that with the key option:

function SomeComp() {
  let fetcher = useFetcher({ key: "my-key" })
  // ...
}

// Somewhere else
function AnotherComp() {
  // this will be the same fetcher, sharing the state across the app
  let fetcher = useFetcher({ key: "my-key" });
  // ...
}

Returns

A FetcherWithComponents object that contains the fetcher's state, data, and components for submitting forms and loading data.