Javascript in HTML
? JavaScript in HTML
JavaScript is a programming language that lets you make your HTML pages interactive and dynamic.
How to Include JavaScript in HTML
1. Inline JavaScript
Directly inside HTML elements using event attributes like onclick, onchange, etc.
<button onclick="alert('Hello!')">Click Me</button>2. Internal JavaScript
Inside a <script> tag within the HTML document.
<!DOCTYPE html><html><head> <title>JavaScript Example</title></head><body> <h1 id="greeting">Hello!</h1> <script> document.getElementById('greeting').textContent = 'Hello, JavaScript!'; </script></body></html>3. External JavaScript File
Link a separate .js file using <script src="filename.js"></script>
<script src="script.js"></script>script.js content:
alert('Hello from external JS file!');Placement of <script> Tag
In the
<head>(may block page rendering)Before
</body>tag (recommended for faster page load)
Why Use JavaScript in HTML?
Respond to user actions (clicks, form submissions)
Manipulate HTML and CSS dynamically (DOM manipulation)
Validate form data before sending to server
Create animations, games, interactive content
Want examples of JavaScript interacting with HTML elements or event handling?
