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Add Remove Class to Body - Toggle Class

To add or remove a class from the body element depending on some condition or user action can be useful for changing the appearance or behavior of the page dynamically. In this tutorial, we will explore how to toggle a class on the body element using three popular frameworks: JavaScript, React, and Vue.

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Example 1: Javascript Add Remove Class to Body (Toggle Class)

In this example, we will learn how to add or remove a class from the body. For Example, you can use it to switch between light and dark themes, show or hide a sidebar, or apply different animations. We will demonstrate how to toggle a class on the body element using JavaScript.

Javascript add remove class to body tag dynamically

  <body>
    <button id="my-button">Toggle Class on Body</button>
    <!-- Your HTML content here -->
  </body>
  <script>
      window.onload = function () {
        // Get the body element
        var body = document.body;

        // Get the button element
        var button = document.getElementById("my-button");

        // Add event listener to the button
        button.addEventListener("click", function () {
          // Toggle the class on the body
          body.classList.toggle("my-class");
        });
      };
    </script>
  <style>
      .my-class {
        background-color: yellow;
      }
    </style>

Run

Output of Javascript add class to body tag dynamically

Example 2 : React Add Class to Body

In this second example of this tutorial, we will learn how to add and remove classes to the body element using React JS. We will utilize the `className` attribute of the body element and the `useState` hook to dynamically change the class name.

React Add Class to Body

  <script type="text/babel">
      const { useEffect, useState } = React;
      const App = () => {
        const [isBodyClassActive, setIsBodyClassActive] = useState(false);

        useEffect(() => {
          if (isBodyClassActive) {
            document.body.classList.add("active");
          } else {
            document.body.classList.remove("active");
          }
        }, [isBodyClassActive]);

        const toggleBodyClass = () => {
          setIsBodyClassActive(!isBodyClassActive);
        };

        return (
          <div className="container">
            <h3>React Js Add Remove class to Body Tag | Toggle class</h3>
            <button onClick={toggleBodyClass}>Toggle Body Class</button>
          </div>
        );
      };

      ReactDOM.render(<App />, document.getElementById("app"));
    </script>

Run

Output of React Js add class to body tag dynamically

Example 3 : Vue Add Class to Body

In this third example, we will learn how to toggle a class on the body element using Vue.js.

Vue Js add remove class to body tag dynamically | Toggle class

    <div id="app">
      <button @click="toggleBodyClass">Toggle Body Class</button>
    </div>
    <script  type="module">
      const app = new Vue({
        el: "#app",
        data() {
          return {
            isBodyClassActive: false,
          };
        },
        methods: {
          toggleBodyClass() {
            this.isBodyClassActive = !this.isBodyClassActive;
          },
        },
        watch: {
          isBodyClassActive(newVal) {
            if (newVal) {
              document.body.classList.add("active");
            } else {
              document.body.classList.remove("active");
            }
          },
        },
      });
    </script>

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