Skip to main content

Redux Tutorial in React JS


What is Redux? 

Redux is the library that is used to distribute the project on different project layers, we can easily manage large & complex projects using this library. Redux library is also useful to debug the application easily can provide better structure and code using Redux.

It contains a separate layer for View, Action, Reducers, and Store.

The store reflected is the brain or main part of redux when we perform any action then the first reducers will map this action and implement operation and that operation will be reflect under store, the store will update the view according to action.it brings the actions and reducers together, holding and changing the state for the whole app.

Action is called an event if we want to perform any operation in view then action will handle that event and pass it to reducers.it contains two properties, one describing the type of action, and another describing what should be changed in the app state.

Reducers are the intermediary between Actions and Store. these are functions that implement the functionality of the actions. it changes the state of the app, based on the action description and the state change description.

Example of Redux.

Now i am explaining the example to control the  welcome logo of react under toggle click.

Create React Project

npx create-react-app scs-redux-tutorial

cd scs-redux-tutorial

Install Redux

 npm install --save redux react-redux

Create actions folder under src and create two file startAction.js and stopAction.js

export const startAction = {
    type: "rotate",
    payload: true
  };

export const stopAction = {
    type: "rotate",
    payload: false
  };

Create reducers folder under src and create rotateReducer.js
export default (state, action) => {
    switch (action.type) {
      case "rotate":
        return {
          rotating: action.payload
        };
      default:
        return state;
    }
  };

create store.js file under src without folder
import { createStore } from "redux";
import rotateReducer from "./reducers/rotateReducer";

function configureStore(state = { rotating: false }) {
  return createStore(rotateReducer,state);
}
export default configureStore;

Go into app.css and replace all css into these css
.App {
  text-align: center;
}

.App-logo {
  animation: App-logo-spin infinite 20s linear;
  height: 40vmin;
}

/* new class here */
.App-logo-paused {
  animation-play-state: paused;
}

.App-header {
  background-color: #282c34;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: calc(10px + 2vmin);
  color: white;
}

.App-link {
  color: #61dafb;
}

@keyframes App-logo-spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

go into app.js and write following code
import logo from './logo.svg';
import './App.css';
import { connect } from "react-redux";
import { startAction } from "./actions/startAction";
import { stopAction } from "./actions/stopAction";
import React from 'react';
class App extends React.Component{
  constructor(props)
  {
    super(props)
    this.fun = this.fun.bind(this);
  }
  fun()
  {
    alert("hello");
   
    //this.props.rotating?this.props.stopAction : this.props.startAction
  }
  render()
  {
    console.log(this.props.rotating)
  return (
    <div className="App">
      <header className="App-header">
      <img  src={logo} className={"App-logo" + (this.props.rotating ? "":" App-logo-paused")} alt="logo" onClick={this.props.rotating?this.props.stopAction : this.props.startAction}  />
        <p>
        <input type="button" onClick={this.props.rotating?this.props.stopAction : this.props.startAction} value="click"/>
        </p>
       
      </header>
    </div>
  );
  }
}
const mapStateToProps = state => ({
  ...state
});

const mapDispatchToProps = dispatch => ({
  startAction: () => dispatch(startAction),
  stopAction: () => dispatch(stopAction)
});
export default connect(mapStateToProps, mapDispatchToProps)(App);

go into index.js file and write following code

import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';

import { Provider } from "react-redux";

import configureStore from "./store";
import App from './App';
import reportWebVitals from './reportWebVitals';

const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
  <React.StrictMode>
    <Provider store={configureStore()}>
    <App />
  </Provider>
  </React.StrictMode>
);

// If you want to start measuring performance in your app, pass a function
// to log results (for example: reportWebVitals(console.log))
// or send to an analytics endpoint. Learn more: https://bit.ly/CRA-vitals
reportWebVitals();

Another Simple Example to create Incrment|Decrement:

Create Action using actionew folder and actions.js file
export const increment = () => ({
    type: 'INCREMENT'
  });
 
  export const decrement = () => ({
    type: 'DECREMENT'
  });
 
Create reducer using reducernew folder and reducers.js file
const initialState = {
    count: 0
  };
 
  const counterReducer = (state = initialState, action) => {
    switch (action.type) {
      case 'INCREMENT':
        return {
          ...state,
          count: state.count + 1
        };
      case 'DECREMENT':
        return {
          ...state,
          count: state.count - 1
        };
      default:
        return state;
    }
  };
 
  export default counterReducer;
 

Create storenew.js
import { createStore } from 'redux';
import counterReducer from './reducersnew/reducers';
const store = createStore(counterReducer);
export default store;


Create ViewNew.js file
import React from 'react';
import { useDispatch, useSelector } from 'react-redux';
import { increment, decrement } from './actionsnew/actions';

const Counter = () => {
  const dispatch = useDispatch();
  const count = useSelector(state => state.count);

  return (
    <div>
      <h1>Count: {count}</h1>
      <button onClick={() => dispatch(increment())}>Increment</button>
      <button onClick={() => dispatch(decrement())}>Decrement</button>
    </div>
  );
};

export default Counter;



Another Example of react redux here click to implement

Create Complete To Do List

Comments

Popular posts from this blog

DSA in C# | Data Structure and Algorithm using C#

  DSA in C# |  Data Structure and Algorithm using C#: Lecture 1: Introduction to Data Structures and Algorithms (1 Hour) 1.1 What are Data Structures? Data Structures are ways to store and organize data so it can be used efficiently. Think of data structures as containers that hold data in a specific format. Types of Data Structures: Primitive Data Structures : These are basic structures built into the language. Example: int , float , char , bool in C#. Example : csharp int age = 25;  // 'age' stores an integer value. bool isStudent = true;  // 'isStudent' stores a boolean value. Non-Primitive Data Structures : These are more complex and are built using primitive types. They are divided into: Linear : Arrays, Lists, Queues, Stacks (data is arranged in a sequence). Non-Linear : Trees, Graphs (data is connected in more complex ways). Example : // Array is a simple linear data structure int[] number...

JSP Page design using Internal CSS

  JSP is used to design the user interface of an application, CSS is used to provide set of properties. Jsp provide proper page template to create user interface of dynamic web application. We can write CSS using three different ways 1)  inline CSS:-   we will write CSS tag under HTML elements <div style="width:200px; height:100px; background-color:green;"></div> 2)  Internal CSS:-  we will write CSS under <style> block. <style type="text/css"> #abc { width:200px;  height:100px;  background-color:green; } </style> <div id="abc"></div> 3) External CSS:-  we will write CSS to create a separate file and link it into HTML Web pages. create a separate file and named it style.css #abc { width:200px;  height:100px;  background-color:green; } go into Jsp page and link style.css <link href="style.css"  type="text/css" rel="stylesheet"   /> <div id="abc"> </div> Exam...

Top 50 Most Asked MERN Stack Interview Questions and Answers for 2025

 Top 50 Most Asked MERN Stack Interview Questions and Answers for 2025 Now a days most of the IT Company asked NODE JS Question mostly in interview. I am creating this article to provide help to all MERN Stack developer , who is in doubt that which type of question can be asked in MERN Stack  then they can learn from this article. I am Shiva Gautam,  I have 15 Years of experience in Multiple IT Technology, I am Founder of Shiva Concept Solution Best Programming Institute with 100% Job placement guarantee. for more information visit  Shiva Concept Solution 1. What is the MERN Stack? Answer : MERN Stack is a full-stack JavaScript framework using MongoDB (database), Express.js (backend framework), React (frontend library), and Node.js (server runtime). It’s popular for building fast, scalable web apps with one language—JavaScript. 2. What is MongoDB, and why use it in MERN? Answer : MongoDB is a NoSQL database that stores data in flexible, JSON-like documents. It...