Create a custom React star rating component

In this tutorial well be building a custom React star rating component. This type of component allows users to give something a rating between 1 and 5 stars with a single mouse click.

Heres how the completed component will look & function:

Lets get started by setting up an application using Create React App:

npx creat-react-app star-rating

Then in the /src directory create a file for the component named StarRating.js. Well start with a bare bones component to test the setup then build out the full functionality:

import React, { useState } from "react";const StarRating = () => {    return (<p>Hello World</p>);};export default StarRating;

Next replace the contents of the App.js file to load in the component:

import StarRating from "./StarRating";import "./App.css";const App = () => {  return (    <div className="App">      <StarRating />    </div>  );};export default App;

Run the npm start command and test that the component is being loaded.

Now back to the StarRating.js file, first thing we need to do is have the component output 5 stars which we do by mapping over an array:

const StarRating = () => {  return (    <div className="star-rating">      {[...Array(5)].map((star) => {                return (                   <span className="star">&#9733;</span>                );      })}    </div>  );};

★ is the HTML entity code for a star icon but you could also use an icon library like Font Awesome here if you wanted. Next we need to add the functionality that sets the star rating when clicked. For this well wrap the stars in a <button> and with a onClick() event:

const StarRating = () => {  const [rating, setRating] = useState(0);  return (    <div className="star-rating">      {[...Array(5)].map((star, index) => {        index += 1;        return (          <button            type="button"            key={index}            className={index <= rating ? "on" : "off"}            onClick={() => setRating(index)}          >            <span className="star">&#9733;</span>          </button>        );      })}    </div>  );};

Were using the State hook to store the value (index) of the star clicked. Depending on the rating selected a class of either on or off is added, this will allow us to style the icons to give a visual representation of the rating selected.

And here is the CSS which well add to the App.css file:

button {  background-color: transparent;  border: none;  outline: none;  cursor: pointer;}.on {  color: #000;}.off {  color: #ccc;}

With the CSS setup we have a functioning component that will show the star rating selected on click. For some added interactivity well also implement a hover effect that indicates the rating that will be selected on click:

const StarRating = () => {  const [rating, setRating] = useState(0);  const [hover, setHover] = useState(0);  return (    <div className="star-rating">      {[...Array(5)].map((star, index) => {        index += 1;        return (          <button            type="button"            key={index}            className={index <= (hover || rating) ? "on" : "off"}            onClick={() => setRating(index)}            onMouseEnter={() => setHover(index)}            onMouseLeave={() => setHover(rating)}          >            <span className="star">&#9733;</span>          </button>        );      })}    </div>  );};

There you have it, a custom star rating component without the need for any additional dependencies or frameworks. As usual the source code for this project can be found on GitHub. Thanks for reading :)