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How do I run JavaScript from HTML?

To run JavaScript from HTML, you can simply include your JavaScript code within the

Another way to run JavaScript from HTML is by linking an external JavaScript file to your HTML document using the

Using Inline Script

Inline scripts are a popular and convenient way to incorporate JavaScript directly into your HTML code. By placing the script between <script> tags, you can execute it whenever the HTML document is loaded. This method is ideal for small snippets of code or quick modifications.


    alert("Hello, World!");

By using alert(), a message box containing "Hello, World!" will pop up when the page is loaded.

Using External Script

For larger JavaScript code snippets or reusable functions, an external script file is recommended. By linking an external JavaScript file to your HTML file using the <script> tag's src attribute, you can keep your code separate and organized.


<script src="myscript.js"></script>

In this example, the JavaScript code resides in a file named "myscript.js" in the same directory as the HTML file. This approach simplifies code management and allows multiple HTML files to share the same JavaScript file.

Using Event Handlers

Event handlers provide a way to trigger JavaScript code when a specific event occurs in an HTML element. You can attach event handlers directly in the HTML code using the onevent attributes. Common events include onclick, onload, and onsubmit.


<button onclick="myFunction()">Click Me</button>

This example demonstrates an onclick event that calls the myFunction() JavaScript function when the button is clicked.

Using Script Tags in Head or Body

Traditionally, JavaScript code is placed before the closing </body> tag. However, you can also include script tags within the <head> section of your HTML document. In this case, it is essential to ensure that the HTML elements referenced by your JavaScript code are loaded before the script executes.


    window.onload = function() {
        // Your JavaScript code here

This example utilizes the window.onload event handler to ensure that the JavaScript code is executed only after the entire page, including its DOM elements, has finished loading.

Using JavaScript Frameworks and Libraries

JavaScript frameworks and libraries, such as jQuery and React, provide powerful tools and abstractions that simplify writing complex JavaScript code. These frameworks often require additional setup and configuration steps detailed in their documentation.


<script src="jquery.min.js"></script>

By including the jQuery library in your HTML file, you can utilize its built-in functions and plugins to enhance your JavaScript capabilities.

Running JavaScript from HTML is an integral part of web development. Whether you choose to use inline scripts, external script files, event handlers, or leverage JavaScript frameworks, understanding these methods will enable you to build dynamic and interactive web pages. Experiment with different approaches and consider the unique requirements of your project to determine the most suitable method for running JavaScript code from HTML.

Running JavaScript from HTML involves embedding JavaScript code within the