JavaScript Answers

How to add inline styles that act as hover in JavaScript?

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You can add inline styles to an element dynamically using JavaScript.

To simulate a hover effect, you can listen for the mouseenter and mouseleave events and then apply or remove the inline styles accordingly.

For example, we write:

<!DOCTYPE html>
<html lang="en">
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Inline Style Hover Effect</title>
        /* Initial styles */
        .box {
            width: 100px;
            height: 100px;
            background-color: red;
            transition: background-color 0.3s ease; /* Smooth transition for color change */
    <div class="box" id="myBox">Hover over me</div>

        var box = document.getElementById('myBox');

        // Add event listeners for mouse enter and leave
        box.addEventListener('mouseenter', function() {
            // Apply inline styles for hover effect
   = 'blue';

        box.addEventListener('mouseleave', function() {
            // Remove inline styles when mouse leaves
   = 'red';

In this example, initially, the .box element has a red background color.

JavaScript listens for mouseenter and mouseleave events on the .box element.

When the mouse enters the .box, JavaScript changes its background color to blue by applying inline styles.

And when the mouse leaves the .box, JavaScript removes the inline style, reverting the background color to red.

This creates a hover effect without using CSS classes.

Remember that using CSS classes with :hover pseudo-class in a separate stylesheet is often the preferred method for maintaining separation of concerns and keeping code organized.

However, in some cases, applying styles directly through JavaScript can be useful, especially for dynamic behavior or when you need to override existing styles.

By John Au-Yeung

Web developer specializing in React, Vue, and front end development.

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