`useSubmit`

The imperative version of <Form> that let's you, the programmer, submit a form instead of the user. For example, submitting the form every time a value changes inside the form:

import { useSubmit, Form } from "react-router-dom";

function SearchField() {
  let submit = useSubmit();
  return (
    <Form
      onChange={(event) => {
        submit(event.currentTarget);
      }}
    >
      <input type="text" name="search" />
      <button type="submit">Search</button>
    </Form>
  );
}

This can also be useful if you'd like to automatically sign someone out of your website after a period of inactivity. In this case, we've defined inactivity as the user hasn't navigated to any other pages after 5 minutes.

import { useSubmit, useLocation } from "react-router-dom";
import { useEffect } from "react";

function AdminPage() {
  useSessionTimeout();
  return <div>{/* ... */}</div>;
}

function useSessionTimeout() {
  const submit = useSubmit();
  const location = useLocation();

  useEffect(() => {
    const timer = setTimeout(() => {
      submit(null, { method: "post", action: "/logout" });
    }, 5 * 60_000);

    return () => clearTimeout(timer);
  }, [submit, location]);
}

Submit target

The first argument to submit accepts many different values.

You can submit any form or form input element:

// input element events
<input onChange={(event) => submit(event.currentTarget)} />;

// React refs
let ref = useRef();
<button ref={ref} />;
submit(ref.current);

You can submit FormData:

let formData = new FormData();
formData.append("cheese", "gouda");
submit(formData);

Submit options

The second argument is a set of options that map directly to form submission attributes:

submit(null, {
  action: "/logout",
  method: "post",
});

// same as
<Form action="/logout" method="post" />;