Build A Simple Counter App using react js

React is a JavaScript toolkit for building interactive user interfaces (UIs) that is becoming more and more well-liked among developers worldwide. How To Build A Simple Counter App In React after learning the language?

Prerequisites

The goal of this tutorial is to introduce developers to the React.js library.The reader should be familiar with the fundamental web development technologies, such as:

  • Basics for HTML and CSS
  • Javascript
  • Basics of React.js in ES6

Note: join Our telegram Channel mostly available on that platform you can ask any question.

What we will Learn

Here we will discuss the basic term and concept of react js. we will learn to code a simple counter app using the React.js library. The workflow of the React counter app will be the same as below.

Video Tutorial | Build A Simple Counter App In React

Before forwarding, we need to understand some terms and concepts in React:-

1. Components :

The React component split the UI into independent, reusable pieces. Which you can use whenever you want

2. States:

Some components may need to store some values. States are used to store values specific to a component.

3. Props :

we want to pass a state from one component to another, props are used.

4. useState:

This is a hook that let you add a state to functional components

Packages to be installed

Let’s start with the first step to install the dependencies. We have to visit the material UI to install the dependencies.

Link to install material UI packages: https://mui.com/material-ui/getting-started/installation/

How To Build A Simple Counter App In React

1. Install React

After the successful installation of Nodejs, install and set up a React app using the below command.

npx create-react-app react-counter-app

Then jump to that folder eg. if your folder name is react-counter-app the type 

cd react-counter-app

After that Go to the App.js file and start your coding part here we will define our state and functions which are required to increment and decrement our numbers .

2. Define the state and functions of your app

here I am defining my state in app.js 

const [counter, setCounter] = useState(0);

After that lets move to function which help to make counter work .

const handleClick1 = () => {
    // Counter state is incremented
    setCounter(counter + 1)
  }
  
  // Function is called everytime decrement button is clicked
  const handleClick2 = () => {
    // Counter state is decremented 
// Also prevent to reched -1 value in this counter

    if(counter === 0)
    {
      return 0;
    }
    
    else {
    setCounter(counter - 1)
    }
  }
  const handleClick3 = () => {
    // Counter state is help to refresh and make counter value to zero
    setCounter(counter == 0);
    window.location.reload()
  }

Last but not least our return part where we have implemented our form and triggers to call functions 

 return (
    <>
    <Box
      component="form"
      sx={{
        '& > :not(style)': { m: 1, width: '25ch' },
      }}
      noValidate
      autoComplete="off"
    ></Box>
 
    <div className="app">
       
      <div className='container'>           
        <div className='total_amount_card' style={{ backgroundImage: `linear-gradient(to right,  rgba(253, 230, 90, 100%), rgba(204, 254, 87, 100%))`}}>
      <div className='right'>
      <svg onClick={handleClick3} xmlns="http://www.w3.org/2000/svg" id="Outline" viewBox="0 0 24 24" width="17" height="17"><path d="M21.962,12.875A10.03,10.03,0,1,1,19.122,5H16a1,1,0,0,0-1,1h0a1,1,0,0,0,1,1h4.143A1.858,1.858,0,0,0,22,5.143V1a1,1,0,0,0-1-1h0a1,1,0,0,0-1,1V3.078A11.985,11.985,0,1,0,23.95,13.1a1.007,1.007,0,0,0-1-1.1h0A.982.982,0,0,0,21.962,12.875Z"/></svg>
      </div> 
          <div className='card_text '>
          <h3 className='total_amount_heading'>{counter}</h3>
          </div>
        </div>
        <form >
        <div className='button_collection'>
          <Stack spacing={2} direction="row">       
          <Button   onClick={handleClick1}  variant="contained" className='btn_one'>+</Button>
          <Button   onClick={handleClick2}   variant="contained" className='btn_two'>-</Button>
          </Stack>
        </div>
        </form>
 
      </div>      
    </div>
    </>
  );

3 Source Code App.js

import './App.css';
import Box from '@mui/material/Box';
// import TextField from '@mui/material/TextField';
import Stack from '@mui/material/Stack';
import Button from '@mui/material/Button';
import {useState} from 'react'
 
function App() {

  const [counter, setCounter] = useState(0);
 
  const handleClick1 = () => {
    // Counter state is incremented
    setCounter(counter + 1)
  }
  
  // Function is called everytime decrement button is clicked
  const handleClick2 = () => {
    // Counter state is decremented

    if(counter === 0)
    {
      return 0;
    }
    
    else {
    setCounter(counter - 1)
    }
  }
  const handleClick3 = () => {
    // Counter state is incremented
    setCounter(counter == 0);
    window.location.reload()
  }

  return (
    <>
    <Box
      component="form"
      sx={{
        '& > :not(style)': { m: 1, width: '25ch' },
      }}
      noValidate
      autoComplete="off"
    ></Box>
 
    <div className="app">
       
      <div className='container'>           
        <div className='total_amount_card' style={{ backgroundImage: `linear-gradient(to right,  rgba(253, 230, 90, 100%), rgba(204, 254, 87, 100%))`}}>
      <div className='right'>
      <svg onClick={handleClick3} xmlns="http://www.w3.org/2000/svg" id="Outline" viewBox="0 0 24 24" width="17" height="17"><path d="M21.962,12.875A10.03,10.03,0,1,1,19.122,5H16a1,1,0,0,0-1,1h0a1,1,0,0,0,1,1h4.143A1.858,1.858,0,0,0,22,5.143V1a1,1,0,0,0-1-1h0a1,1,0,0,0-1,1V3.078A11.985,11.985,0,1,0,23.95,13.1a1.007,1.007,0,0,0-1-1.1h0A.982.982,0,0,0,21.962,12.875Z"/></svg>
      </div> 
          <div className='card_text '>
          <h3 className='total_amount_heading'>{counter}</h3>
          </div>
        </div>
        <form >
        <div className='button_collection'>
          <Stack spacing={2} direction="row">       
          <Button   onClick={handleClick1}  variant="contained" className='btn_one'>+</Button>
          <Button   onClick={handleClick2}   variant="contained" className='btn_two'>-</Button>
          </Stack>
        </div>
        </form>
 
      </div>      
    </div>
    </>
  );
}
 
export default App;

4. CSS Part For This App 

.app {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
 
}
 
.container {
  background-color: #FAF9FA;
  border-radius: 8px;
  padding: 3rem;
  margin-top: 6rem;
}
.heading_text
{
  font-size: 15px !important;
  font-weight: 400;
}
.heading_two
{
  padding-top: 5px;
}
.total_amount_card
{
  height: 537px;
  background-color: #D6FF58;
  border-radius: 27px; 
}

.right
{
  float: right;
  margin-top: -2rem;
}
.card_text {
  padding-top: 40px;
}
.total_amount_heading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 60px;
  font-weight: 800;
  padding-top: 10rem;
}
.total_amount_para {
  text-align: center;
  font-size: 18px !important;
  padding-top: 5px;
  color: #4B4B4B;
}
.input_area
{
  margin-top: 40px;
}
 
.input_field
{
  margin-top: 30px;
  width: 445px;
}
#outlined-basic {
  width: 410px;
}
 
.button_collection
{
  margin-top: 61px;
  margin-bottom: 1rem;
}
.btn_one {
  background-color: #F2F2F2 !important;
  width: 200px;
  height: 75px;
  color: black !important;
  font-weight: 600;
  font-size: 20px !important;
 
}

.btn_two {
  background-color: #F2F2F2 !important;
  width: 200px;
  height: 75px;
  color: black !important;
  font-size: 20px !important;
 
}

Also, Download the Background image file (mentioned below ) of the app is an image file and paste this file into your public folder also define your CSS with the background-CSS image part .

Background Image File

GitHub

You can always refer to the GitHub repository to clone the project we have created.

https://github.com/tinkugupta5/Counter_app

Conclusion

yeey!

We did it! ? Hope you like How To Build A Simple Counter App In React using hooks. For such projects do visits and comment on which project should I cover next.

Check out this BMI Calculator using react and hooks. Comment if you have any dought Regarding this project please comment in the comment box. Or join Our telegram Channel mostly available on that platform you can ask any question.

Happy coding!

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