how to change background color using js with code examples

JavaScript is a powerful programming language that can be used to create dynamic and interactive websites. One of the things that JavaScript can be used for is to change the background color of a webpage. This can be done by manipulating the CSS (Cascading Style Sheets) of the webpage. In this article, we will show you how to change the background color of a webpage using JavaScript with code examples.

First, let's start with the HTML code of a basic webpage. This is the code that will be used as the foundation for our examples:

<!DOCTYPE html>
<html>
<head>
  <title>JavaScript Background Color Change</title>
</head>
<body>
  <h1>JavaScript Background Color Change</h1>
  <p>Click the button below to change the background color of this webpage.</p>
  <button id="color-button">Change Color</button>
</body>
</html>

In this code, we have a basic webpage with a heading, a paragraph, and a button. The button has an "id" attribute of "color-button", which we will use to reference it in our JavaScript code.

To change the background color of the webpage using JavaScript, we will first need to select the body element of the webpage. This can be done using the document.querySelector() method. This method is used to select elements from the HTML document using a CSS selector. In our case, we want to select the body element, so we will use the 'body' as the CSS selector.

var body = document.querySelector('body');

Once we have selected the body element, we can use the style property to change the background color. The style property is an object that can be used to access and modify the CSS styles of an HTML element. To change the background color, we will set the backgroundColor property of the style object to the desired color.

body.style.backgroundColor = 'blue';

This will change the background color of the webpage to blue.

But this is not the only way to change the background color. We can also use the classList property to add and remove CSS classes, which can be used to change the background color. To do this, we need to create a CSS class with the desired background color and then add or remove the class to the body element using the classList property.

.blue-background {
  background-color: blue;
}
body.classList.add('blue-background');

This will add the class "blue-background" to the body element, and the background color of the webpage will change to blue. To change the background color to a different color, we can simply remove the "blue-background" class and add a new class with the desired color.

body.classList.remove('blue-background');
body.classList.add('green-background');

Finally, we can add an event listener to the button so that when it is clicked, the background color of the webpage will change. We can use the addEventListener method to attach an event listener to the button. In the event listener function, we can use the code we wrote earlier to change the background color.

var button =
document.querySelector('#color-button');

button.addEventListener('click', function() {
  body.classList.remove('blue-background');
  body.classList.add('green-background');
});

With this code, when the button is clicked, the "blue-background" class will be removed from the body element and the "green-background" class will be added, changing the background color of the webpage to green.

Another way to change the background color is using the setAttribute method. This method can be used to set or change the value of an attribute of an HTML element. In this case, we can set the style attribute of the body element to change the background color.

body.setAttribute('style', 'background-color: yellow');

This will change the background color to yellow.

It is also possible to use innerHTML property of a element and add inline css to change the background color.

document.getElementById("color-button").innerHTML = "<div style='background-color:purple'>Change Color</div>";

In conclusion, there are several ways to change the background color of a webpage using JavaScript. You can use the style property to directly change the background color, the classList property to add and remove CSS classes, or the setAttribute method. It's also possible to use innerHTML property to add inline css. Each method has its own advantages and disadvantages, and the best method to use will depend on the specific requirements of your project.

Popular questions

  1. What is the purpose of using JavaScript to change the background color of a webpage?
  • The purpose of using JavaScript to change the background color of a webpage is to make the webpage dynamic and interactive by allowing the user to change the background color on command.
  1. How can we select the body element of a webpage using JavaScript?
  • The body element of a webpage can be selected using the document.querySelector() method with the 'body' CSS selector as its argument.
  1. What property can be used to change the background color of an HTML element using JavaScript?
  • The style property can be used to change the background color of an HTML element by setting the backgroundColor property of the style object to the desired color.
  1. Can we use CSS classes to change the background color of a webpage using JavaScript? How?
  • Yes, we can use CSS classes to change the background color of a webpage using JavaScript by creating a CSS class with the desired background color and then adding or removing the class to the body element using the classList property.
  1. Is it possible to change the background color using setAttribute method?
  • Yes, it is possible to change the background color using the setattribute method by setting the style attribute of the body element to the desired background color value.

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As a developer, I have experience in full-stack web application development, and I'm passionate about utilizing innovative design strategies and cutting-edge technologies to develop distributed web applications and services. My areas of interest extend to IoT, Blockchain, Cloud, and Virtualization technologies, and I have a proficiency in building efficient Cloud Native Big Data applications. Throughout my academic projects and industry experiences, I have worked with various programming languages such as Go, Python, Ruby, and Elixir/Erlang. My diverse skillset allows me to approach problems from different angles and implement effective solutions. Above all, I value the opportunity to learn and grow in a dynamic environment. I believe that the eagerness to learn is crucial in developing oneself, and I strive to work with the best in order to bring out the best in myself.
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