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Calculating Quantity and Price Total in React

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by Abdul Rawoof A R dot icon Updated: Feb 16, 2023

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Calculate the quantity and price total in React by looping through the cart, which consists of products, getting the price of each product in the cart, and adding each price to a single variable.


The formula for calculating the total price of the product we have purchased is "Selling Price = Cost Price + Profit Margin". We can divide the total cost by the number of products purchased by the user to get the cost price. The relationship between quantity and price is nothing. Still, a price increase leads to a quantity increase supplied of that good or service to the users, whereas a price decrease will decrease the quantity supplied. To convert price to quantity and to find the unit(product) price using a simple formula if the product quantity and total cost are known. Then divide the total price by the product quantity to find the unit price. And thus, the unit price is equal to the total price divided by the product quantity. There are two different types of functions are there rationing and allocating. The function related to the buyers of the good is rationing the price used to ration the limited quantity of good among the various buyers or customers who would like to purchase it.

Here is an example of how you can calculate the quantity and price total in React:

Fig : Preview of the output that you will get on running this code from your IDE.

Code

In this solution we're using React library.

Calculating quantity and price total in react

JavaScriptdotLines of Code : 56dotLicense : Strong Copyleft (CC BY-SA 4.0)

class App extends React.Component {
  state = {
    products: [
      {title: 'Apple', count: 0, price: 100},
      {title: 'IBM', count: 0, price: 200},
      {title: 'HP', count: 0, price: 300},
    ]
  }
  
  onChange = (index, val) => {
    this.setState({
      products: this.state.products.map((product, i) => (
        i === index ? {...product, count: val} : product
      ))
    })
  }

  render () {
    return (
      <div>
        <ProductList products={this.state.products} onChange={this.onChange} />
        <Total products={this.state.products} />
      </div>
    )
  }
};

const ProductList = ({ products, onChange }) => (
  <ul>
    {products.map((product, i) => (
      <li key={i}>
        {product.title}
        <input 
          type="text" 
          value={product.count}
          onChange={e => onChange(i, parseInt(e.target.value) || 0)}
        />
      </li>
    ))}
  </ul>
);

const Total = ({ products }) => (
  <h3>
    Price: 
    {products.reduce((sum, i) => (
      sum += i.count * i.price
    ), 0)}
  </h3>
)


ReactDOM.render(<App />, document.querySelector('#root'));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script>
<div id="root"></div>

Instructions

Follow the steps carefully to get the output easily.

  1. Install the Node.js and React on your IDE(preferable Visual Studio Code).
  2. Create React Application using npx create-react-app foldername.
  3. cd foldername.
  4. Open the folder in IDE.
  5. Copy the code using "copy" button above and paste it in index.js file(remove the earlier code from index.js) then paste the script tag in index.html file.
  6. Import React and ReactDOM in index.js file.
  7. Open the terminal from IDE.
  8. npm start to run the file.


I hope you found this useful. I have added the link to dependent libraries, version information in the following sections.


I found this code snippet by searching for 'calculating quantity and price in react' in kandi. You can try any such use case!

Environment Tested

I tested this solution in the following versions. Be mindful of changes when working with other versions.

  1. The solution is created in Visual Studio Code 1.73.1.
  2. The solution is tested on node v18.12.1 and npm v8.19.2.
  3. React version-18.2.0.


Using this solution, we are able to calculate quantity and price total in React with simple steps. This process also facilities an easy way to use, hassle-free method to create a hands-on working version of code which would help us to calculate quantity and price total in React.

Dependent Library

reactby facebook

JavaScript doticonstar image 209050 doticonVersion:v18.2.0doticon
License: Permissive (MIT)

The library for web and native user interfaces

Support
    Quality
      Security
        License
          Reuse

            reactby facebook

            JavaScript doticon star image 209050 doticonVersion:v18.2.0doticon License: Permissive (MIT)

            The library for web and native user interfaces
            Support
              Quality
                Security
                  License
                    Reuse

                      You can also search for any dependent libraries on kandi like 'react'.

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