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Version du 26 octobre 2024 à 16:46

Links

React
Vite
Microsoft doc
React Developer Tools
[Javascript#LINQ_équivalent|LINQ equivalent]

Description

React is a library. It lets you put components together, but it doesn’t prescribe how to do routing and data fetching.
To build an entire app with React, we recommend a full-stack React framework like Next.js or Remix.

Command line

# create a new project (framework: React, variant: TypeScript)
npm create vite@latest

# install the packages
npm install

# run the project
npm run dev

Basic App

public/index.html

<body>
    <!-- hosts the React application -->
    <div id="root"></div>
    <script type="module" src="/src/main.tsx"></script>
</body>

src/main.tsx

import { StrictMode } from 'react'
import { createRoot } from 'react-dom/client'
import './index.css'

createRoot(document.getElementById('root')!).render(
  <StrictMode>
    <h1>My App</h1>
  </StrictMode>,
)

package.json

Component

src/App.tsx

import { useState } from 'react'
import './App.css'

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

  return (
    <>
      <h1>My App</h1>
    </>
  )
}

export default App

src/main.tsx

import { StrictMode } from 'react'
import { createRoot } from 'react-dom/client'
import App from './App.tsx'

createRoot(document.getElementById('root')!).render(
  <StrictMode>
    <App />
  </StrictMode>,
)

Styling

ClassName

App.tsx

<div className="container"></div>

App.css

.container { }

Hooks

State

Allows to store values.

// items is the variable used to store the items
// setItems is a function to set a new value to items
const [items, setItems] = useState<Item[]>([]);

Effect

Allows to connect a component to an external system.

useEffect(() => {
  const fetchData = async () => {
    const result = await axios(`${API}?query=react`);
  };
  
  fetchData();
}, []);

Responding to Events

export default function Button() {
  function handleClick() {
    alert('You clicked me!');
  }

  return (
    <button onClick={handleClick}>
      Click me
    </button>
  );
}

Visual Studio Code

Debug

Install the Debugger for Firefox extension.

.vscode/launch.json

{
    "version": "0.2.0",
    "configurations": [
        {
            "name": "Launch Firefox against localhost",
            "type": "firefox",
            "request": "launch",
            "url": "http://localhost:5173",
            "webRoot": "${workspaceFolder}"
        }
    ]
}

Naming convention

file name: PascalCase

// use the filename as the component name, so PascalCase
import App from './App.tsx'

@@ Ligne 4 : / Ligne 4 : @@
 * [https://learn.microsoft.com/en-us/windows/dev-environment/javascript/react-overview Microsoft doc]
 * [https://react.dev/learn/react-developer-tools React Developer Tools]
+* [Javascript#LINQ_équivalent|LINQ equivalent]
 = Description =

« React + Vite + TS » : différence entre les versions