React Intermediate - Class 2

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Lecture 56 :- React Intermediate - Class 2

In "React Intermediate - Class 2," we'll continue exploring more intermediate React concepts and build on what we learned in the previous classes. We'll cover topics such as React Router advanced usage, form handling, and controlled components.

Step 1: React Router - Advanced Usage

In the previous classes, we used basic routing with React Router. However, React Router offers more advanced features, such as nested routes, route parameters, and redirects.

Nested Routes:

Nested routes allow you to render components within other components based on their URLs. This is useful for creating layouts with multiple sections.

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import React from 'react'; import { BrowserRouter as Router, Route, Link } from 'react-router-dom'; function App() {  return (    <Router>      <div>        <h1>Hello, React!</h1>        <nav>          <ul>            <li>              <Link to="/">Home</Link>            </li>            <li>              <Link to="/about">About</Link>            </li>            <li>              <Link to="/products">Products</Link>            </li>          </ul>        </nav>        <Route exact path="/" component={Home} />        <Route path="/about" component={About} />        <Route path="/products" component={Products} />      </div>    </Router>  ); } function Products() {  return (    <div>      <h2>Products</h2>      <ul>        <li>          <Link to="/products/1">Product 1</Link>        </li>        <li>          <Link to="/products/2">Product 2</Link>        </li>      </ul>      <Route path="/products/:id" component={ProductDetail} />    </div>  ); } function ProductDetail({ match }) {  const { id } = match.params;  return <h3>Product Detail: {id}</h3>; } // Rest of the components (Home, About) are the same as before...

In this example, we have nested routes for the /products page. The Products component renders a list of products and provides nested routes for individual product details using the :id route parameter.

Step 2: Form Handling and Controlled Components

In React, you can handle form inputs using controlled components. Controlled components are components where form data is handled by React state.

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import React, { useState } from 'react'; function Form() {  const [formData, setFormData] = useState({    username: '',    email: '',    password: '',  });  const handleChange = (e) => {    const { name, value } = e.target;    setFormData((prevFormData) => ({ ...prevFormData, [name]: value }));  };  const handleSubmit = (e) => {    e.preventDefault();    // Process form data here...  };  return (    <div>      <h2>Form Example</h2>      <form onSubmit={handleSubmit}>        <input          type="text"          name="username"          value={formData.username}          onChange={handleChange}          placeholder="Username"        />        <input          type="email"          name="email"          value={formData.email}          onChange={handleChange}          placeholder="Email"        />        <input          type="password"          name="password"          value={formData.password}          onChange={handleChange}          placeholder="Password"        />        <button type="submit">Submit</button>      </form>    </div>  ); } export default Form;

In this example, the form input values are controlled by the formData state. The handleChange function updates the state whenever a user types in the input fields.

Step 3: Using Components Together

Now, let's use the advanced React Router features, Form, and the ThemeProvider from the previous class in the App.js.

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import React from 'react'; import { BrowserRouter as Router, Route, Link, Switch } from 'react-router-dom'; import Home from './Home'; import About from './About'; import Form from './Form'; import ParentComponent from './ParentComponent'; import UserList from './UserList'; import Button from './Button'; import { ThemeProvider, ThemeContext } from './ThemeContext'; function App() {  const { theme, setTheme } = React.useContext(ThemeContext);  const toggleTheme = () => {    setTheme((prevTheme) => (prevTheme === 'light' ? 'dark' : 'light'));  };  return (    <Router>      <ThemeProvider>        <div style={{ backgroundColor: theme === 'light' ? '#fff' : '#333' }}>          <h1>Hello, React!</h1>          <nav>            <ul>              <li>                <Link to="/">Home</Link>              </li>              <li>                <Link to="/about">About</Link>              </li>              <li>                <Link to="/products">Products</Link>              </li>            </ul>          </nav>          <Switch>            <Route exact path="/" component={Home} />            <Route path="/about" component={About} />            <Route path="/products" component={Products} />            <Route path="/form" component={Form} />            <Route path="/user-list" component={UserList} />            <Route path="/parent-component" component={ParentComponent} />            <Route path="/button" component={Button} />          </Switch>          <Button onClick={toggleTheme} text="Toggle Theme" />        </div>      </ThemeProvider>    </Router>  ); } export default App;

Congratulations! You've completed the second class of React Intermediate. You've learned about React Router advanced usage, form handling with controlled components, and nested routes.

React offers a wide range of possibilities for building powerful and interactive user interfaces. As you continue your React journey, you can explore more intermediate and advanced topics such as custom hooks, state management libraries like Redux, and server-side rendering with Next.js.

Keep practicing, building more complex applications, and exploring the vast possibilities of React! Happy coding!

14. React Intermediate

23 Comments

@familyvimes@gmail.com
[email protected] Jul 22, 2024 at 10:33 PM

Kindly check the lecture number 6. Lifecycle of a Change in 1. Git and Github The above lecture is not related to the course please update it ASAP Thank you

@harshp.cs.22
harshp.cs.22 Jul 10, 2024 at 3:37 PM

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@familyvimes@gmail.com
[email protected] Jul 23, 2024 at 12:05 PM

I have attached the link https://github.com/lakshayk12/ANN_optimization_BTP

@zubaid.zu
zubaid.zu May 9, 2024 at 2:42 AM

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@admin79
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Now your Paypal payment is accepted and your course is activated successfully. Please leave your valuable feedback.

@anandwising
anandwising Mar 12, 2024 at 4:05 PM

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@admin79
admin79 Mar 12, 2024 at 5:22 PM

Dear anand, your payment is now updated check your course, apologize for several delays. Please leave your valuable feedback.

@anandwising
anandwising Mar 12, 2024 at 8:33 PM

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@Megha
Megha Feb 22, 2024 at 11:02 PM

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@akshaykumrawat99
akshaykumrawat99 Feb 22, 2024 at 10:56 PM

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rajnireddyatr Feb 3, 2024 at 12:08 AM

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@talha.developments
talha.developments Jan 18, 2024 at 9:34 PM

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@aryangrg020
aryangrg020 Jan 17, 2024 at 10:25 PM

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@Krishanpal
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@sciaku1
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@shivanshgautam220
shivanshgautam220 Jan 10, 2024 at 4:57 PM

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@sciaku1
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@p8354046
p8354046 Jan 7, 2024 at 3:47 PM

Why i am being asked for payment if i am already enrolled in the course

@sciaku1
sciaku1 Jan 11, 2024 at 3:19 PM

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@myidontablet
myidontablet Dec 30, 2023 at 4:28 PM

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@sciaku1
sciaku1 Jan 6, 2024 at 1:42 AM

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@duabhi911
duabhi911 Nov 16, 2023 at 2:03 AM

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@harshp.cs.22
harshp.cs.22 Dec 23, 2023 at 11:40 AM

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@myidontablet
myidontablet Dec 30, 2023 at 4:28 PM

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@sciaku1
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@lenientharsh
lenientharsh Oct 31, 2023 at 10:56 AM

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@lenientharsh
lenientharsh Oct 31, 2023 at 10:51 AM

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@hydrarishabh9
hydrarishabh9 Oct 21, 2023 at 11:47 PM

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@sciaku1
sciaku1 Oct 30, 2023 at 5:34 PM

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@minhajakram440
minhajakram440 Oct 18, 2023 at 11:18 PM

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@aeromusgyan
aeromusgyan Oct 21, 2023 at 1:17 AM

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@saklyi70
saklyi70 Sep 30, 2023 at 11:02 AM

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@sciaku1
sciaku1 Jan 6, 2024 at 1:47 AM

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jitendrakrverma02 Sep 23, 2023 at 3:57 PM

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@sciaku1
sciaku1 Jan 6, 2024 at 1:47 AM

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@9035praveen
9035praveen Sep 2, 2023 at 12:12 PM

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@mohammedunaismdr
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@mishraprajjwal295
mishraprajjwal295 Oct 13, 2023 at 11:07 PM

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@rahulkumarbaraswal30
rahulkumarbaraswal30 Nov 4, 2023 at 1:32 PM

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@bicky
bicky Sep 1, 2023 at 5:42 PM

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