Introduction to Remix: React Framework for the Modern Web

Submit , but doesn’t affect the current route. Enables submitting or reloading data in isolation. useSubmit Hook You can programmatically submit forms or data using JavaScript, useful for interactions like auto-saving or submitting without a button click. Example: import { useSubmit } from '@remix-run/react'; function AutoSubmit({ formRef }) { const submit = useSubmit(); useEffect(() => { if (formRef.current) { submit(formRef.current); } }, []); } Explanation: useSubmit() sends form data without a visible form action. Useful for silent submissions, autosave, or dynamic workflows. Creating a New Remix Project To start a new Remix project, use the following command: npx create-remix@latest The CLI prompts you to name the project and select a deployment target such as Express or Cloudflare Workers. Once complete, navigate to the project folder and start the development server using: npm run dev The application runs at http://localhost:3000. Routing and File-Based Structure Routes in Remix are defined using the filesystem. Each file inside the app/routes directory corresponds to a route. Nested files automatically create nested routes and layouts. app/ ├── routes/ ├── index.jsx // / ├── about.jsx // /about └── dashboard/ ├── index.jsx // /dashboard └── stats.jsx // /dashboard/stats Loaders and Data Fetching Each route exports a loader function that runs on the server before rendering, fetches data per request, and makes it available to the component using the useLoaderData hook. It has all the required data at render time, eliminating the need for client-side fetching or loading indicators. export async function loader() { const data = await fetchDataFromAPI(); return json(data); } Explanation: loader is an async function exported from the route module fetchDataFromAPI() retrieves external data await pauses execution until data is available json(data) returns a structured HTTP response Actions and Form Handling Treats elements uses the action export in route files to process form submissions. Client-managed forms handle form submissions via native POST requests. export async function action({ request }) { const formData = await request.formData(); // handle submission logic } Explanation: action is an async function exported from the route request holds the incoming HTTP request request.formData() parses the submitted form formData contains key-value pairs from the Nested Routes and Layouts Uses route nesting to compose layouts and manage data loading hierarchically. Each parent route can define UI and shared data, while child routes render into their layout. // Parent route export default function DashboardLayout() { return (

{/* child routes render here */}

); } Explanation: DashboardLayout wraps nested routes in a shared UI renders the sidebar renders the matching nested route inside the layout Error and Catch Boundaries Introduces structured error handling that can be defined at the route level, providing scoped fallback UIs and a better debugging experience.Ensures that a failure in one route doesn’t break the entire application. export function ErrorBoundary({ error }) { return

Error: {error.message}

; } Explanation: ErrorBoundary handles uncaught route-levels errors error.message is displayed in the UI Data Caching and Revalidation Supports HTTP caching headers, and can control how routes are cached using standard HTTP directives. Revalidation strategies like stale-while-revalidate can be applied using loader functions and headers, which improves loading performance for frequently accessed pages. export async function loader() { return json(data, { headers: { 'Cache-Control': 'max-age=60, stale-while-revalidate=120', }, }); } Explanation: 'Cache-Control' defines client and proxy caching rules max-age=60 serves data fresh for 60 seconds stale-while-revalidate=120 allows stale data for 2 more minutes Video Playback in Remix Video players in Remix can be built using standard HTML5

Boost Campaign Performance Through Video