tracking-form-status

Development

Teaches useFormStatus hook for tracking form submission state in React 19. Use when implementing submit buttons, form loading states, or pending indicators.

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Form Status Tracking with useFormStatus

useFormStatus provides status info about parent form submissions.

Basic Usage

MUST be called inside a form component:

import { useFormStatus } from 'react-dom';

function SubmitButton() {
  const { pending, data, method, action } = useFormStatus();

  return (
    <button type="submit" disabled={pending}>
      {pending ? 'Submitting...' : 'Submit'}
    </button>
  );
}

function MyForm() {
  async function handleSubmit(formData) {
    'use server';
    await saveData(formData);
  }

  return (
    <form action={handleSubmit}>
      <input name="email" />
      <SubmitButton />
    </form>
  );
}

Return Values

pending (boolean): Whether form is submitting
data (FormData | null): Data being submitted
method (string): HTTP method ('get' or 'post')
action (function | null): Action function

Critical Requirement

❌ Wrong - called at form level:

function MyForm() {
  const { pending } = useFormStatus();
  return <form>...</form>;
}

✅ Correct - called inside form:

function MyForm() {
  return (
    <form>
      <SubmitButton />
    </form>
  );
}

function SubmitButton() {
  const { pending } = useFormStatus();
  return <button disabled={pending}>Submit</button>;
}

For comprehensive useFormStatus documentation, see: research/react-19-comprehensive.md lines 312-355.