Remix Front-End Development

ecommerce

Lecture

Auteur

Affiliations

Emmanuel BRUNO

Université de Toulon

LIS UMR CNRS 7020

Date de publication

2024-11-03

Front end development with Remix

React is a popular JavaScript library for building user interfaces.
Remix is a full-stack web framework that combines React with server-side rendering and data loading capabilities.
In this lecture, we will explore advanced front-end development with React in the context of Remix.

React Components: Functional Components

Functional Components: These are JavaScript functions that return JSX. They are the simplest way to create a React component.
- Example:
```
export default function MyComponent() {
return <div>Hello, World!</div>;
}
```
- Explanation: Function components are stateless and are typically used for rendering UI elements. They do not have their own state or lifecycle methods.
- Benefits:
  - Simplicity: Easier to write and understand.
  - Performance: Generally faster due to the lack of lifecycle methods.
  - Testing: Easier to test as they are simple functions.

JSX - JavaScript XML

JSX: A syntax extension for JavaScript that looks similar to HTML and is used to describe the UI.
- Example:
```
 // File: app/components/ExampleComponent.tsx
const ExampleComponent = () => {
  const element = (
    <div>
      <h1>Hello, World!</h1>
      <p>Welcome to learning JSX with React.</p>
      <ul>
        <li>JSX is a syntax extension for JavaScript.</li>
        <li>It looks similar to HTML.</li>
        <li>It is used to describe the UI.</li>
      </ul>
    </div>
  );
  return element;
};

export default ExampleComponent;
```
- Explanation: JSX allows you to write HTML-like syntax in your JavaScript code. It makes it easier to create and visualize the structure of your UI. Under the hood, JSX is transformed into JavaScript function calls that React uses to create and update the DOM.
- Benefits:
  - Readability: Makes the code more readable and easier to understand.
  - Integration: Seamlessly integrates with JavaScript, allowing you to use JavaScript expressions within JSX.
  - Tooling: Supported by various tools and libraries, enhancing the development experience.

React Components: Class Components

Class Components: These are ES6 classes that extend from React.Component and have a render method that returns JSX.
- Example:
```
import React from 'react';

export default class MyComponent extends React.Component {
  render() {
    return <div>Hello, World From Class component !</div>;
  }
}
```
- Explanation: Class components can hold and manage state and lifecycle methods, making them more powerful but also more complex than functional components.
- Benefits:
  - State Management: Can manage their own state.
  - Lifecycle Methods: Can use lifecycle methods to perform actions at different stages of the component’s lifecycle.
  - Flexibility: More flexible in handling complex logic and interactions.

Using Components in Remix Routes

Using Components in Remix Routes: You can use the previously defined components in your Remix routes to build your application’s UI.

Example:

// File: app/routes/HelloRoute.tsx
import MyComponent from '~/components/MyComponent';
import MyClassComponent from '~/components/MyClassComponent';
import ExampleComponent from '~/components/ExampleComponent';

export default function HelloRoute() {
  return (
    <div>
      <h1>Welcome to Remix</h1>
      <MyComponent />
      <MyClassComponent />
      <ExampleComponent />
    </div>
  );
}

Explanation: In this example, the HelloRoute route imports and uses the MyComponent and MyClassComponent components to render them within the route’s UI. This demonstrates how you can compose your application’s UI using reusable components.

JavaScript in JSX with Curly Braces

JavaScript in JSX: You can embed any JavaScript expression in JSX by wrapping it in curly braces {}. This allows you to dynamically insert values, call functions, and perform operations within your JSX code.
Example: Embedding Variables

const name = 'John';
const element = <h1>Hello, {name}!</h1>;

In this example, the value of the name variable is embedded in the JSX using curly braces. The rendered output will be “Hello, John!”.
Example: Using Functions in JSX

function formatName(user: { firstName: any; lastName: any; }) {
  return user.firstName + ' ' + user.lastName;
}

const user = {
  firstName: 'John',
  lastName: 'Doe'
};

const element = <h1>Hello, {formatName(user)}!</h1>;

In this example, the formatName function is called within the JSX to format the user’s name. The rendered output will be “Hello, John Doe!”.

Example: Conditional Rendering

const isLoggedIn = true;
const element = (
  <div>
    {isLoggedIn ? <h1>Welcome back!</h1> : <h1>Please sign in.</h1>}
  </div>
);

In this example, the isLoggedIn variable is used to conditionally render different elements. If isLoggedIn is true, “Welcome back!” is rendered; otherwise, “Please sign in.” is rendered.

Example: Looping in JSX

const numbers = [1, 2, 3, 4, 5];
const listItems = numbers.map((number) =>
  <li key={number.toString()}>{number}</li>
);

const element = (
  <ul>
    {listItems}
  </ul>
);

In this example, the map method is used to create a list of <li> elements from an array of numbers. Each <li> element is assigned a unique key prop.

Example: Embedding Expressions

const element = <h1>{2 + 2}</h1>;

In this example, the result of the expression 2 + 2 is embedded in the JSX. The rendered output will be “4”.

Styling in Remix

Using Tailwind CSS:
- Tailwind CSS is included in the Blues Stack template.
- Example:
```
<div className="p-4 bg-blue-500 text-white">
  Hello, Tailwind!
</div>
```
- Explanation: Tailwind CSS is a utility-first CSS framework that provides low-level utility classes to build custom designs without writing custom CSS. It allows you to apply styles directly in your HTML using class names.
- Benefits:
  - Rapid Development: Quickly build custom designs without leaving your HTML.
  - Consistency: Ensures consistent styling across your application.
  - Customization: Easily customize and extend the default styles to fit your design needs.
- Example with Customization:
```
<div className="p-4 bg-gradient-to-r from-green-400 via-blue-500 to-purple-600 text-white rounded-lg shadow-lg">
  Customized Tailwind Component
</div>
```
- Explanation: In this example, additional Tailwind CSS classes are used to create a gradient background, rounded corners, and a shadow effect, demonstrating the flexibility and power of Tailwind CSS.

Props

Props: Short for properties, props are read-only attributes used to pass data from parent to child components.
- Example with Default Props:
```
Greeting.defaultProps = {
  name: 'Guest'
};

type GreetingProps = {
  readonly name?: string;
};

export default function Greeting(props: GreetingProps) {
      return <h1>Hello, {props.name}</h1>;
    }
```
- Explanation: In this example, the Greeting component has a default prop value for name. If no name prop is provided, it defaults to “Guest”.
- Benefits:
  - Data Flow: Ensures a unidirectional data flow, making the application easier to understand and debug.
  - Reusability: Allows components to be reused with different data.
  - Flexibility: Enables the creation of dynamic and flexible components.

Passing Parameters to Components

Passing Parameters: To pass parameters (props) to the Greeting component, you can specify them when using the component in another component or route.
- Example:
```
// File: app/routes/HelloRoute.tsx
import Greeting from '~/components/Greeting';

export default function HelloRoute() {
  return (
    <div>
      <Greeting name="John" />
      <Greeting />
    </div>
  );
}
```
- Explanation: In this example, the HelloRoute component passes the name prop with the value “John” to the first Greeting component. The second Greeting component does not receive a name prop, so it defaults to “Guest”.

Forms and Actions in Remix

Forms: Forms are essential for collecting user input and interacting with the server. Remix provides built-in support for handling forms and form submissions.

Using the `Form` Component

Using the Form Component:

Remix provides a Form component to handle form submissions.

Example:

// app/routes/contact.tsx
import { Form } from '@remix-run/react';
import { redirect, ActionFunction } from '@remix-run/node';

export default function Contact() {
  return (
    <Form method="post">
      <label>
        Name: <input type="text" name="name" />
      </label>
      <button type="submit">Submit</button>
    </Form>
  );
}

//see next slide for action function

Explanation: The Form component in Remix handles form submissions and integrates with the action function to process the form data on the server.

Actions

Handling Form Submissions:

Use the action function to handle form submissions on the server-side.

Example:

// app/routes/contact.tsx
// ...
 export let action: ActionFunction = async ({ request }) => {
  const formData = await request.formData();
  const name = formData.get("name");

  // Process the form data (e.g., save to database)
  console.log("Name: "+name);

  return redirect("/thank-you");
};

Explanation: The action function processes form submissions on the server. It receives the form data, processes it, and can return a response or redirect the user.

React Hooks

Hooks: Functions that let you use state and other React features in functional components. Hooks allow you to use React features without writing a class. Common hooks include:
- useState: Adds state to functional components.
- useEffect: Performs side effects in functional components.
- useContext: Accesses context values in functional components.
- useReducer: Manages complex state logic in functional components.
- useLoaderData: Accesses data loaded on the server in Remix.
- useParams: Accesses URL parameters in Remix.
- useFetcher: Performs client-side data fetching and form submissions in Remix.

State

State: A built-in object that stores property values that belong to the component. State changes can trigger re-renders.

Example:

// File: app/components/FormComponent.tsx
import { useState } from 'react';

function FormComponent() {
  const [name, setName] = useState('');
  const [count, setCount] = useState(0);

  return (
    <div>
      <form>
        <label>
          Name:
          <input type="text" value={name} onChange={(e) => setName(e.target.value)} />
        </label>
      </form>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>Click me</button>
    </div>
  );
}

export default FormComponent;

Explanation: State is used to manage data that changes over time in a component. When the state changes, the component re-renders to reflect the new data.
Benefits:
- Dynamic UI: Allows components to render dynamic content based on user interactions or other events.
- Interactivity: Enables the creation of interactive components that respond to user input.
- Encapsulation: Keeps the state local to the component, making it easier to manage and reason about.

Example: Using `useState`

// File: app/components/Counter.tsx
import { useState } from 'react';

function Counter() {
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

export default Counter;

Explanation: The useState hook allows you to add state to functional components. In this example, count is a state variable, and setCount is a function to update it.

Example: Using `useEffect`

// File: app/components/useEffect.tsx
import { useEffect } from 'react';

function Example() {
  useEffect(() => {
    document.title = 'Hello, World!';
  }, []);

  return <div>Hello, World!</div>;
}

Explanation: The useEffect hook allows you to perform side effects in functional components. In this example, it updates the document title when the component mounts.

Example: Using `useContext`

// File: app/components/ThemeContext.tsx
import { createContext } from 'react';

export const ThemeContext = createContext({
  background: 'darkblue',
  color: 'white'
});

Explanation: The ThemeContext file creates a context with default values for background and color. This context can be used by any component within the provider to access and apply the theme.

// File: app/components/ThemedButton.tsx
import { useContext } from 'react';
import { ThemeContext } from './ThemeContext';

function ThemedButton() {
  const theme = useContext(ThemeContext);

  return (
    <button style={{ background: theme.background, color: theme.color }} className="px-4 py-2 rounded">
      I am styled by theme context!
    </button>
  );
}

export default ThemedButton;

Explanation: The useContext hook allows you to access context values in functional components. In this example, it retrieves the current theme from ThemeContext.

Example: Using `useReducer`

// File: app/components/CounterWithReducer.tsx
import { useReducer } from 'react';

type State = {
  count: number;
};

type Action = 
  | { type: 'increment' }
  | { type: 'decrement' };

const initialState: State = { count: 0 };

function reducer(state: State, action: Action): State {
  switch (action.type) {
    case 'increment':
      return { count: state.count + 1 };
    case 'decrement':
      return { count: state.count - 1 };
    default:
      throw new Error('Unknown action type');
  }
}

function CounterWithReducer() {
  const [state, dispatch] = useReducer(reducer, initialState);

  return (
    <div className="flex flex-col items-center p-4">
      <p className="text-xl mb-4">Count: {state.count}</p>
      <div>
        <button
          className="px-4 py-2 bg-blue-500 text-white rounded mr-2"
          onClick={() => dispatch({ type: 'increment' })}
        >
          Increment
        </button>
        <button
          className="px-4 py-2 bg-red-500 text-white rounded"
          onClick={() => dispatch({ type: 'decrement' })}
        >
          Decrement
        </button>
      </div>
    </div>
  );
}

export default CounterWithReducer;

Explanation: The useReducer hook is an alternative to useState for managing complex state logic. In this example, it uses a reducer function to handle state transitions.

Example: Using `useLoaderData`

// File: app/routes/fakerestproducts.tsx
import { useLoaderData } from "@remix-run/react";

export const loader = async () => {
  const response = await fetch("https://fakestoreapi.com/products");
  const products = await response.json();
  return { products };
};

export default function FakeRestProducts() {
  const { products } = useLoaderData<{ products: { id: number; title: string }[] }>();
  return (
    <div className="p-4">
      <h1 className="text-2xl font-bold mb-4">Products</h1>
      <ul className="space-y-2">
        {products.map(product => (
          <li key={product.id} className="p-4 bg-white shadow rounded">
            {product.title}
          </li>
        ))}
      </ul>
    </div>
  );
}

Explanation: The useLoaderData hook allows you to access data that was loaded on the server by the loader function. This ensures that the data is fetched before the component is rendered, improving performance and SEO. In this example, the loader function fetches product data from the Fake Store API and returns it. The FakeRestProducts component then uses useLoaderData to access and display the product data.
Benefits:
- Server-Side Data Loading: Ensures data is loaded on the server, reducing the time to first meaningful paint and improving SEO.
- Simplified Data Access: Makes it easy to access server-loaded data within components, reducing the complexity of data fetching logic.
- Separation of Concerns: Keeps data fetching logic separate from component rendering logic, making the code more maintainable and easier to understand.

Example: Using `useParams`

// File: app/routes/ProductWithParam.$productId.tsx
import { useParams } from "@remix-run/react";

export default function Product() {
  const { productId } = useParams();
  return (
    <div className="p-4">
      <h1 className="text-2xl font-bold">Product ID: {productId}</h1>
    </div>
  );
}

Explanation: The useParams hook allows you to access URL parameters in your component. This is useful for dynamic routes where the URL contains variable segments. By accessing these parameters, you can fetch and display data specific to the parameter value.
Server-Side Aspect: In a Remix application, the server handles the initial request and can use the URL parameters to fetch data before rendering the component. This ensures that the data is available when the component is rendered, improving performance and user experience. The filename ProductWithParam.$productId.tsx indicates that this route will handle URLs with a dynamic productId parameter.
Benefits:
- Dynamic Routing: Enables the creation of dynamic routes that can handle different parameter values.
- Improved Performance: By fetching data on the server side, the component can be rendered with the necessary data already available.
- SEO Friendly: Server-side data fetching ensures that search engines can index the content properly.
Call Sample:
- To see this in action, navigate to a URL like /product/123 in your Remix application. The Product component will display:
```
Product ID: 123
```

Example: Using `useFetcher`

// File: app/routes/search.tsx
import { useFetcher } from "@remix-run/react";
import { json } from "@remix-run/node";
import type { LoaderFunction } from "@remix-run/node";

// Loader function to handle search queries
export const loader: LoaderFunction = async ({ request }) => {
  const url = new URL(request.url);
  const query = url.searchParams.get("query");

  // Return an empty array if no query is provided
  if (!query) {
    return json([]);
  }

  // Simulate a search operation (replace with actual search logic)
  const results = [
    { id: 1, name: "Result 1" },
    { id: 2, name: "Result 2" },
    { id: 3, name: "Result 3" },
  ].filter(result => result.name.toLowerCase().includes(query.toLowerCase()));

  return json(results);
};

// SearchPage component
export default function SearchPage() {
  const fetcher = useFetcher();
  const results = fetcher.data || [];

  return (
    <div className="p-4">
      <h1 className="text-2xl font-bold mb-4">Search Page</h1>
      {/* Form to submit search query */}
      <fetcher.Form method="get" action="/search" className="mb-4">
        <input type="text" name="query" placeholder="Search..." className="border p-2 rounded" />
        <button type="submit" className="ml-2 px-4 py-2 bg-blue-500 text-white rounded">Search</button>
      </fetcher.Form>
      {/* Display search results */}
      {results.length > 0 ? (
        <ul className="list-disc list-inside">
          {results.map((result: any) => (
            <li key={result.id}>{result.name}</li>
          ))}
        </ul>
      ) : (
        <p>No results found</p>
      )}
    </div>
  );
}

Explanation: The useFetcher hook allows you to perform client-side data fetching and form submissions without navigating away from the current page. This is useful for implementing search forms, data filtering, and other interactions that require fetching data without a full page reload.
Benefits:
- Client-Side Data Fetching: Enables data fetching and form submissions directly from the client side, improving user experience by avoiding full page reloads.
- Seamless User Experience: Provides a smoother and more responsive user experience by handling data fetching and form submissions in the background.
- Flexibility: Can be used for various use cases such as search forms, data filtering, and more.
Call Sample:
- To see this in action, navigate to the /search route in your Remix application and use the search form. The SearchPage component will handle the form submission and fetch the search results without navigating away from the current page.

Context

Context: A way to pass data through the component tree without having to pass props down manually at every level.
- Example:
```
import React, { createContext, useContext } from 'react';

// Create a Context
const MyContext = createContext();

// Create a Provider component
function MyProvider({ children }) {
  const value = { name: 'John' };
  return <MyContext.Provider value={value}>{children}</MyContext.Provider>;
}

// Create a component that consumes the context
function MyComponent() {
  const context = useContext(MyContext);
  return <div>Hello, {context.name}</div>;
}

// Use the Provider in your app
function App() {
  return (
    <MyProvider>
      <MyComponent />
    </MyProvider>
  );
}

export default App;
```
- Explanation: Context allows you to share data between components without having to pass props at every level of the component tree. In this example, MyContext is created using createContext, and MyProvider is a component that provides the context value to its children. MyComponent consumes the context value using useContext.
- Benefits:
  - Simplifies Prop Drilling: Eliminates the need to pass props through multiple levels of components.
  - Centralized State Management: Allows for centralized management of state that needs to be accessed by multiple components.
  - Improves Code Readability: Makes the code more readable and maintainable by reducing the number of props passed around.

Data Loading in Remix

Loader Functions:

Fetch data on the server-side and pass it to the component.

Example:

// app/routes/products.tsx
import { useLoaderData } from "remix";
import { json } from "remix";

// Mock function to simulate fetching products from a database or API
async function fetchProducts() {
  return [
    { id: 1, name: "Product 1" },
    { id: 2, name: "Product 2" },
    { id: 3, name: "Product 3" }
  ];
}

export const loader = async () => {
  const products = await fetchProducts();
  return json({ products });
};

export default function Products() {
  const { products } = useLoaderData();
  return (
    <div>
      <h1>Products</h1>
      <ul>
        {products.map(product => (
          <li key={product.id}>{product.name}</li>
        ))}
      </ul>
    </div>
  );
}

Explanation: Loader functions run on the server before the component renders. They fetch data and pass it to the component via the useLoaderData hook.
Benefits:
- Server-Side Rendering: Ensures that data is fetched and ready before the component renders, improving performance and SEO.
- Separation of Concerns: Keeps data fetching logic separate from the component, making the code more modular and maintainable.
- Error Handling: Allows for centralized error handling in the loader function, making it easier to manage and debug data fetching issues.
Note: Detailed information on connecting to databases and fetching data will be covered in the next lecture.

Client-Side Validation

Using JavaScript for Validation:

Perform client-side validation before submitting the form.

Example:

// app/routes/contact.tsx
import { Form, useActionData } from "remix";
import { useState } from "react";

export default function Contact() {
  const [name, setName] = useState("");
  const actionData = useActionData();

  const handleSubmit = (event: React.FormEvent) => {
    if (name.trim() === "") {
      event.preventDefault();
      alert("Name is required");
    }
  };

  return (
    <Form method="post" onSubmit={handleSubmit}>
      <label>
        Name: <input type="text" name="name" value={name} onChange={(e) => setName(e.target.value)} />
      </label>
      <button type="submit">Submit</button>
      {actionData && <p>{actionData.message}</p>}
    </Form>
  );
}

Explanation: Client-side validation ensures that the form data meets certain criteria before it is submitted to the server. This improves the user experience by providing immediate feedback.

Server-Side Validation

Validating Data in the Action Function:

Perform server-side validation in the action function.

Example:

// app/routes/contact.tsx
import { ActionFunction, json } from "remix";

export let action: ActionFunction = async ({ request }) => {
  const formData = await request.formData();
  const name = formData.get("name");

  if (!name || typeof name !== "string" || name.trim() === "") {
    return json({ message: "Name is required" }, { status: 400 });
  }

  // Process the form data (e.g., save to database)
  console.log(name);

  return json({ message: "Form submitted successfully" });
};

Explanation: Server-side validation ensures that the form data is valid before it is processed. This is important for security and data integrity.

Error Handling

Error Boundaries:
- Catch errors during rendering and data loading.
- Principles:
  - Isolation: Error boundaries isolate errors to prevent them from crashing the entire application.
  - Fallback UI: They provide a fallback UI to inform users that something went wrong.
  - Logging: Error boundaries can log errors for debugging and monitoring purposes.

Example:

// app/routes/FormWithErrorBoundary.jsx
import React, { useState } from 'react';
import ErrorBoundary from './ErrorBoundary';

function Form() {
  const [name, setName] = useState('');

  const handleSubmit = (event) => {
    event.preventDefault();
    if (name.trim() === '') {
      throw new Error('Name is required');
    }
    // Process form submission
    console.log('Form submitted:', name);
  };

  return (
    <form onSubmit={handleSubmit}>
      <label>
        Name:
        <input type="text" value={name} onChange={(e) => setName(e.target.value)} />
      </label>
      <button type="submit">Submit</button>
    </form>
  );
}

export default function FormWithErrorBoundary() {
  return (
    <ErrorBoundary>
      <Form />
    </ErrorBoundary>
  );
}

Explanation: This example demonstrates how to use an error boundary to catch validation errors in a form. If the name field is empty, an error is thrown and caught by the ErrorBoundary, which displays a styled error message.

Client-Side Navigation

Using the <Link> Component:

Example:

// app/routes/index.tsx
import { Link } from "remix";

export default function Index() {
  return (
    <div>
      <h1>Welcome to Remix</h1>
      <nav>
        <Link to="/about">About</Link>
      </nav>
    </div>
  );
}

The <Link> component is used for client-side navigation. It prevents the default browser behavior of reloading the page and instead uses the Remix router to navigate.

Virtual DOM

Virtual DOM: A lightweight copy of the actual DOM that React uses to optimize updates and rendering.
- Explanation:
  - React creates a virtual representation of the DOM in memory.
  - When the state of an object changes, React updates the virtual DOM first.
  - React then compares the virtual DOM with the actual DOM and makes the necessary updates.
  - This process is called reconciliation and it helps to optimize performance by minimizing direct manipulations of the actual DOM.
- Benefits:
  - Performance: Reduces the number of direct DOM manipulations, which are typically slow.
  - Efficiency: Updates only the parts of the DOM that have changed, rather than re-rendering the entire DOM.
  - Predictability: Provides a more predictable and manageable way to handle UI updates.
  - Abstraction: Allows developers to work with a simpler and more abstract representation of the UI, making it easier to reason about and manage.
- Example:
```
const element = <h1>Hello, world!</h1>;
ReactDOM.render(element, document.getElementById('root'));
```
  - Explanation: In this example, React creates a virtual DOM representation of the <h1> element and renders it to the actual DOM element with the ID root. When the state of the element changes, React will update the virtual DOM first and then reconcile it with the actual DOM.

Conclusion

Recap: Building modern front-end applications with Remix.
- We covered the key features of Remix, including:
  - Setting up a Remix project.
  - Creating React components (functional and class components).
  - Using JSX to describe the UI.
  - Managing state and props in React components.
  - Utilizing React hooks (useState, useEffect, useContext, useReducer, useLoaderData, useParams, useFetcher).
  - Styling with Tailwind CSS.
  - Handling forms and actions in Remix.
  - Implementing client-side and server-side validation.
  - Using context to share data across components.
  - Loading data on the server-side with loader functions.
  - Navigating with the <Link> component.
  - Understanding the Virtual DOM and its benefits.
Key Takeaways:
- Remix and React Integration: Remix enhances React applications by providing server-side rendering, data loading, and routing capabilities.
- Component-Based Architecture: React’s component-based architecture allows for building reusable and maintainable UI components.
- State Management: Effective state management using hooks and context is crucial for building dynamic and interactive applications.
- Styling: Tailwind CSS offers a utility-first approach to styling, enabling rapid development and consistent design.
- Form Handling: Remix simplifies form handling and validation, both on the client-side and server-side.
- Performance Optimization: The Virtual DOM and server-side data loading improve performance and SEO.

Réutilisation

CC BY-NC 4.0

Front end development with Remix

React Components: Functional Components

JSX - JavaScript XML

React Components: Class Components

Using Components in Remix Routes

JavaScript in JSX with Curly Braces

Example: Conditional Rendering

Example: Looping in JSX

Example: Embedding Expressions

Styling in Remix

Props

Passing Parameters to Components

Forms and Actions in Remix

Using the Form Component

Actions

React Hooks

State

Example: Using useState

Example: Using useEffect

Example: Using useContext

Example: Using useReducer

Example: Using useLoaderData

Example: Using useParams

Example: Using useFetcher

Context

Data Loading in Remix

Client-Side Validation

Server-Side Validation

Error Handling

Client-Side Navigation

Virtual DOM

Conclusion

Réutilisation

Using the `Form` Component

Example: Using `useState`

Example: Using `useEffect`

Example: Using `useContext`

Example: Using `useReducer`

Example: Using `useLoaderData`

Example: Using `useParams`

Example: Using `useFetcher`