Add class name in different li by pure in JavaScript?

JavascriptWeb DevelopmentFront End TechnologyObject Oriented Programming

To add class, use forEach() along with classList.add().

Example

Following is the code −

<!DOCTYPE html>
<html lang="en">
<head>
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Document</title>
</head>
<link rel="stylesheet"
href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<style>
   .demo1 {
      color: yellow;
   }
   .demo2 {
      color: skyblue;
   }
</style>
<body>
<ul>
<li>Javascript</li>
<li>MySQL</li>
<li>Java</li>
<li>MongoDB</li>
</ul>
</body>
<script>
   addingClassUsingJavascript();
   function addingClassUsingJavascript() {
      const all = document.querySelectorAll('li');
      all.forEach(function (t, i) {
         if (i === 1) {
            t.classList.add('demo1');
         } else if (i === 2) {
            t.classList.add('demo2');
         }
      });
   }
</script>
</html>

To run the above program, save the file name anyName.html(index.html). Right click on the file and select the option “Open with live server” in VS Code editor.

Output

This will produce the following output −

raja
Published on 26-Oct-2020 15:46:53
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