How to implement a function “getScript” that fetches/executes a JavaScript file in browser ? Last Updated : 17 May, 2023 Comments Improve Suggest changes Like Article Like Report In this article, we will learn how to fetch a JavaScript file(.js) and load it in a web browser dynamically by using JavaScript with HTML. We need a web browser i.e., Chrome (recommended) or Electron Application. Sometimes we need to add a script in the document as per the requirement of the user interface which cannot be done on the default page load. This article is all about fetching a JS file from any jQuery (CDN) link or React file in Document Object Model. Approach : Create a new script element.let newscript = document.createElement('script');Provide the source of the newly created script element.newscript.src = document.getElementById("source").value;Append the element in the DOM head so that it could execute the script.document.head.appendChild(newscript) The above approach is implemented below in the example by considering the following file resources as for example scripts that are loaded dynamically. Resources: You can use this CDN link in the input field to get fetched. JQuery CDN: https://code.jquery.com/jquery-3.5.1.js React CDN : https://unpkg.com/react@17/umd/react.development.js https://unpkg.com/react-dom@17/umd/react-dom.development.js Custom Script: https://graphicalstructure.codes/Geeks.js Note: We will be using these files. (Users can use any source as per their requirement). Example: In this example, we will use the above approach. HTML <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> </head> <body> <input type="text" id="source" style="width: 60%" placeholder="Enter the link of source." /> <button id="loadscript">Fetch and Load!</button> <script> document.getElementById("loadscript") .onclick = function getScript() { let newscript = document.createElement("script"); newscript.src = document .getElementById("source").value; document.head.appendChild(newscript); }; </script> </body> </html> Output: The following output shows the dynamic loading of JavaScript files. jQuery CDN: Dynamically loading ReactJS : loading Custom JS : Notes: Users can use any events on the element to load the script. In this article. "onclick" event has been used.Scripts should not contain errors otherwise they may throw errors and may cause the immediate stoppage of code execution.Use proper error handling so that the execution of code doesn't get interrupted if any error occurred while fetching.The above implementation is also valid for ElectronJS. Comment More infoAdvertise with us Next Article How to implement a function “getScript” that fetches/executes a JavaScript file in browser ? therain0605 Follow Improve Article Tags : Technical Scripter JavaScript Web Technologies Technical Scripter 2020 HTML-Questions JavaScript-Questions JavaScript-Events +3 More Similar Reads How to check the current runtime environment is a browser in JavaScript ? In this article, we will see how to detect the runtime environment in which our JavaScript code is running. Suppose you are building an application in Node.js and need to include that code in a webpage that would be run on a browser. 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