React - create simple animated progress bar

#react #webdev #javascript #tutorial

Hello! 👋 😊

Today I want to show you a simple animated progress bar that I recently made in React.

Before we start, I would highly recommend you to check out runnable example for the solution on our website:
React - create simple animated progress bar

Final effect of this post:

Below I present you my solution for a simple progress bar with some styling 📊🎨.

In this solution I use:

useState hook to store the progress bar's state,
content width measured in percents according to the container - that trick lets us display progress from 0% to 100% in an easy way,
some example buttons that trigger setProgress() method to demonstrate how the progress bar works (animation between switching has a nice effect).

Practical example:

import React from 'react';

const containerStyle = {
    border: '1px solid silver',
    background: '#ededed'
};

const contentStyle = {
    background: '#00cc00',
    height: '24px',
    textAlign: 'center',
    lineHeight: '24px',
    fontFamily: 'sans-serif',
    transition: '0.3s'
};

const ProgressBar = ({progress}) => {
    const state = `${progress}%`;
    return (
      <div style={containerStyle}>
        <div style={{...contentStyle, width: state}}>
          {progress > 5 ? state : ''}
        </div>
      </div>
    );
};

const App = () => {
  const [progress, setProgress] = React.useState(25);
  return (
    <div>
      <ProgressBar progress={progress} />
      <br />
      <div>
        <button onClick={() => setProgress(0)}>0%</button>
        <button onClick={() => setProgress(5)}>5%</button>
        <button onClick={() => setProgress(15)}>15%</button>
        <button onClick={() => setProgress(50)}>50%</button>
        <button onClick={() => setProgress(75)}>75%</button>
        <button onClick={() => setProgress(100)}>100%</button>
      </div>
    </div>
  );
};

export default App;

You can run this example here

Let me know what you think in the comment section! 😊💬

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Top comments (4)

Andrew Bone • Feb 25 '21

This is very nice, something cool you could add is the progressbar role from ARIA.

Something like this.

const ProgressBar = ({progress}) => {
  const state = `${progress}%`;
    return (
      <div role="progressbar" 
        aria-valuenow={progress}
        aria-valuemin="0"
        aria-valuemax="100"
        style={containerStyle}
      >
        <div style={{...contentStyle, width: state}}>
          {progress > 5 ? state : ''}
        </div>
      </div>
    );
};

This little change means screen readers now know what's going on within the component.

Dirask-React • Feb 25 '21

Will do! Thanks for the tips. 😊🔥

Thomas Ledoux • Feb 26 '21

Nice and simple!
I think it might be even better if you used the HTML element instead!
Then your code is semantically correct too :-)
developer.mozilla.org/en-US/docs/W...