Syntax error How to add an active class to the current element with JavaScript?

How to add an active class to the current element with JavaScript?

To add an active class to the current element with JavaScript, the code is as follows −

Example

 Live Demo

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1" />
<style>
   .btn {
      border: none;
      outline: none;
      padding: 10px 16px;
      background-color: #6ea2f0;
      cursor: pointer;
      color:white;
      font-size: 18px;
   }
   .active, .btn:hover {
      background-color: #666;
      color: white;
   }
</style>
</head>
<body>
<h1>Active Button Example</h1>
<div id="sampleDiv">
<button class="btn">Giraffe</button>
<button class="btn active">Cow</button>
<button class="btn">Lion</button>
<button class="btn">Leopard</button>
<button class="btn">Cheetah</button>
</div>
<h2>Press any of the above button to set it class to active</h2>
<script>
   var btns = document.querySelectorAll(".btn");
   Array.from(btns).forEach(item => {
      item.addEventListener("click", () => {
         var selected = document.getElementsByClassName("active");
         selected[0].className = selected[0].className.replace(" active", "");
         item.className += " active";
      });
   });
</script>
</body>
</html>

Output

The above code will produce the following output −

On clicking any other button −

Updated on: 2020-05-08T13:35:43+05:30

2K+ Views

Kickstart Your Career

Get certified by completing the course

Get Started
Advertisements