My Development Notes

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Dark Mode Toggle button using HTML, CSS and JavaScript

Here’s a simple way to create a toggle button to switch between light mode and dark mode using HTML, CSS and JavaScript function. 

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="stylesheet" href="style.css" />
    <title>Document</title>
  </head>
  <body>
    <div class="container">
      <h1>Click to switch between Light Mode and Dark Mode</h1>
      <button id="toggle">Click Here</button>
    </div>
    <script src="app.js"></script>
  </body>
</html>
body {
  background-color: #fff;
  color: #333;
  transition: background-color 0.5s ease-in;
}

.container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.dark-mode {
  background-color: #333;
  color: #f5f5f5;
}

In the above CSS code block, we’ve created the default light mode background for the body. We’ve also created another dark-mode class which will be activated dynamically using the JavaScript function.

const toggleBtn = document.getElementById("toggle");
const body = document.body;

toggleBtn.addEventListener("click", function () {
  body.classList.toggle("dark-mode");
});

In the above JavaScript section, we’ve written a JS function to toggle the button on click event to dark-mode class in the CSS section.

Note that the .dark-mode class is not already present inside the HTML section of the code. It’s added in the CSS section and activated using a simple JavaScript event listener.

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