How to Run JavaScript in HTML

Are you new to web development and wondering how to run JavaScript in HTML? Look no further! In this article, we will cover the basics of JavaScript and how to incorporate it into your HTML code. From simple scripts to more complex functionality, we will guide you through the process step-by-step.

What is JavaScript?

JavaScript is a programming language used primarily for web development. It is a client-side language, meaning it runs on the user’s browser rather than the server. This allows for dynamic, interactive web pages that can respond to user inputs and events.

JavaScript can be used for a variety of tasks, such as form validation, creating animations and effects, and interacting with APIs. It is a versatile language that is constantly evolving, with new features and updates being added regularly.

Setting up your HTML file

Before we can start running JavaScript in our HTML file, we need to set up the file itself. First, create a new file and save it with a .html extension. Next, add the basic structure of an HTML document:

    Page Title

This creates the basic framework of an HTML document, with the page title and body tags. The "head" section is where we will link our JavaScript file.

Adding JavaScript to your HTML file

There are two ways to add JavaScript code to an HTML file: inline and external. Inline code is written directly into an HTML element using the "on" attribute, such as "onclick" or "onload". External code is written in a separate JavaScript file and linked to the HTML file using the "script" tag.

Inline code can be useful for simple scripts, such as changing the background color of a button when it is clicked. However, for more complex functionality, it is better to use external code to keep the HTML document clean and organized.

To link an external JavaScript file to your HTML document, add the following code to the "head" section:

Replace "path/to/your/javascript/file.js" with the actual path to your JavaScript file. Make sure to include the file extension (.js).

Writing JavaScript code

Now that we have our HTML file set up and linked to a JavaScript file, we can start writing our code. JavaScript code is written in plain text, using a text editor such as Notepad or Sublime Text.

The basic syntax of JavaScript is similar to other programming languages, with statements ending in a semicolon and variables being declared using the "var" keyword. Here is an example of a simple JavaScript function:

function greeting() {
  var name = prompt("What is your name?");
  alert("Hello, " + name + "!");

This function prompts the user for their name and then displays a personalized greeting in an alert box. To call this function from an HTML element, we can use the "onclick" attribute:

Say hello

This creates a button that, when clicked, will run the "greeting" function.


In this article, we have covered the basics of running JavaScript in HTML. From setting up an HTML document to writing JavaScript code, we have provided a step-by-step guide to help you get started with web development.

JavaScript is a powerful language that can be used to create dynamic, interactive web pages. With practice and experimentation, you can unlock its full potential and create amazing web applications. Happy coding!

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