useActionData

The useActionData hook is a part of the Remix framework and is used to access data stored in the action response.

The useActionData hook is a part of the Remix.Run framework and is used to access data stored in the action response. In this guide, we will explain how to use the useActionData hook in a TypeScript project and provide code examples to illustrate its usage.

Introduction

useActionData is a custom hook provided by the Remix.Run framework to retrieve the action data that was passed during a form submission. This hook can be used in your components to access the data returned by your action functions.

Usage

To use the useActionData hook, first import it from the @remix-run/react package. Then, call the hook in your component to access the action data.

Here's an example of using the useActionData hook in a TypeScript file:

//components/MyComponent.tsx
import { useActionData } from "@remix-run/react";

interface ActionData {
  message: string;
}

function MyComponent() {
  const actionData: ActionData | null = useActionData();

  return (
    <div>
      <h1>MyComponent</h1>
      {actionData && <p>{actionData.message}</p>}
    </div>
  );
}

export default MyComponent;

In this example, we define an interface ActionData to represent the shape of the data we expect from the action function. This interface will be used to type the data returned by the useActionData hook.

The actionData variable will hold the data returned by the action function. If there's no data, the value will be null.

Action Function

The action function is responsible for handling form submissions and returning the action data. Here's an example of an action function that returns a message as action data:

// components/MyForm.tsx
import { Link, Form } from "@remix-run/react";
import { useActionData } from "@remix-run/react";
import type { ActionFunction, LoaderFunction } from "@remix-run/server-runtime";
import { json } from "@remix-run/server-runtime";

// Action Data Interface
interface ActionData {
  message: string;
}

// Action Function
export const action: ActionFunction = async ({ request }) => {
  const formData = await request.formData();
  const name = formData.get("name") as string;
  const email = formData.get("email") as string;

  // Handle the form submission logic here, e.g., store the data in a database.

  const actionData: ActionData = {
    message: `Form submitted successfully! Name: ${name}, Email: ${email}`,
  };

  return json(actionData);
};

// Loader Function
export const loader: LoaderFunction = async ({ request }) => {
  return json({});
};

// MyForm Component
function MyForm() {
  const actionData: ActionData | null | undefined = useActionData();

  return (
    <div>
      <h1>Submit Form</h1>
      <Form method="post">
        <label htmlFor="name">Name:</label>
        <input type="text" id="name" name="name" required />
        <br />
        <label htmlFor="email">Email:</label>
        <input type="email" id="email" name="email" required />
        <br />
        <button type="submit">Submit</button>
      </Form>
      {actionData && <p>{actionData.message}</p>}
      <Link to="/">Go back</Link>
    </div>
  );
}

export default MyForm

In this file, we've created a module scoped action function myAction, a loader function loader, and the MyForm component.

The loader function receives actionData as a parameter and returns it, which makes the data available via the useLoaderData hook in the component. Note that the useLoaderData hook is called after the action function has been executed, so you should only rely on the data from useLoaderData if you need it after form submission.

Now the form component, action function, and loader function are all in the same file, and the useActionData hook will access the action data returned by the myAction function.

Working Example

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