JavaScript Basics: Making Pages Interactive

Manual: General · Subject: Web Design & Development

Learn how JavaScript adds behavior, reacts to user actions, and changes page content.

What JavaScript Does

JavaScript is the programming language of the web. It lets pages respond to clicks, validate forms, update content, and make decisions.

Programs use variables to store data, conditionals to make choices, and functions to organize repeated actions.

JavaScript basics

Variable

A named container for data

Function

A reusable block of code

Event

Something that happens, like a click

Conditional

Code that runs only when a condition is true

Array

An ordered list of values

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Start with small wins

Your first scripts can be tiny: a button that shows a message or a form that checks input.

What is JavaScript mainly used for on websites?

Adding structure Adding interactivity Compressing images Buying domains

What is a function in programming?

Which is an example of an event?

A heading A click A color A font