September 12, 2021

How to Change Button Color on Click in Javascript

By Krishnaa JavaScript Questions 0 Comments

In this tutorial, you will learn how to change button color on click in javascript. By default, the color of a button is always white with black text, but we can change that color using CSS or javascript.

In CSS, we have a backgroundColor property to change the background color of an element. In javascript, we can take advantage of same property to achieve our goal and change the color of a button on click. Each element has style property and this property contains all style-related properties such as color, backgroundColor, borderColor, etc.

In the following example, we have three buttons and we want to change their background color when they are clicked. Please have a look over the code example and steps given below.

HTML & CSS

We have 4 elements in the HTML file (1 div and 3 button). The div element is just a wrapper for the rest of the elements.
The 3 button elements have “Primary”, “Danger”, and “Success” as their inner text.
We have done some basic styling using CSS and added the link to our style.css stylesheet inside the head element.
We have also included our javascript file script.js with a script tag at the bottom.

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <link rel="stylesheet" href="style.css">
  <title>Document</title>
</head>
<body>
  
  <div>
    <button id="primary">Primary</button>
    <button id="danger">Danger</button>
    <button id="success">Success</button>
  </div>

  <script src="script.js"></script>
</body>
</html>

div {
    display: flex;
    justify-content: center;
}

button {
    padding: 10px 20px;
    margin: 5px;
    background-color: black;
    color: #fff;
    border: none;    
    outline: none;
    border-radius: 5px;
}

Javascript

We have selected all 3 button elements using the document.querySelector() method and stored them in btnPrimary, btnDanger, and btnGreen variables.
We have attached a click event listener to all the button elements.
The button element has style property. This property points to an object which contains all style-related properties. The backgroundColor property is one of them. We will use this property to change the color of the button element
Upon click of the primary button, we will change the color of the button to “#337ab7”, which is a light blue color.
Upon click of the danger button, we will change the color of the button to “#c9302c”, which is a maroon color.
Upon click of the success button, we will change the color of the button to “#4cae4c”, which is a green color.

let btnPrimary = document.querySelector('#primary');
let btnDanger = document.querySelector('#danger');
let btnSuccess = document.querySelector('#success');

btnPrimary.addEventListener('click', () => btnPrimary.style.backgroundColor = '#337ab7')
btnDanger.addEventListener('click', () => btnDanger.style.backgroundColor = '#c9302c')
btnSuccess.addEventListener('click', () => btnSuccess.style.backgroundColor = '#4cae4c')

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