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How to load a JavaScript file Dynamically?

Following is the code to load a JavaScript file dynamically −

Example

 Live Demo

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
   body {
      font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
   }
   .result {
      font-size: 20px;
      font-weight: 500;
   }
</style>
</head>
<body>
<h1>Load a JavaScript file Dynamically</h1>
<div style="color: green;" class="result"></div>
<button class="Btn">CLICK HERE</button>
<h3>
Click the above button to load external JavaScript
</h3>
<script>
   let resEle = document.querySelector(".result");
   document.querySelector(".Btn").addEventListener("click", () => {
      var jsRef = document.createElement("script");
      jsRef.setAttribute("src", "sample.js");
      document.getElementsByTagName("head")[0].appendChild(jsRef);
   });
</script>
</body>
</html>

script.js

resEle.innerHTML='JavaScript has been loaded';

Output

The above code will produce the following output −

On clicking the ‘CLICK HERE’ button −

Updated on 17-Jul-2020 08:56:27

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