DOM Manipulation

Learn how to dynamically update web pages to create interactive business applications.

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What You'll Learn

Select page elements with getElementById and querySelector

Update text, attributes, and styles, and respond to click and input events

Create and remove elements and use event delegation to render from data

Handle form submission with validation and keep updates fast and responsive

Description

DOM manipulation is how a web page changes after it loads — showing a message, adding a table row, validating a form, reacting to a click. This tutorial covers the native browser APIs (getElementById, querySelector, textContent, classList, addEventListener, createElement) that every framework is built on top of.

You will work through four chapters with runnable code examples and an interactive to-do demo you can click in your browser, alongside the equivalent vanilla-DOM code. Each chapter also shows how to describe the behaviour you want to an AI assistant and check what it gives back.

By the end you will be able to select elements safely, wire up events, render lists from a data array, validate a form on submit, and avoid the layout-thrashing patterns that make pages feel slow.

What's inside

About 2 hours•4 chapters

1.Selecting Elements — what the DOM is, finding elements with getElementById and querySelector, and describing the change you want to an AI assistant.
2.Text, Styles & Events — reading and changing text, attributes and styles, and wiring up your first click and input listeners.
3.Events & Rendering — creating and removing elements, event delegation, and rendering the DOM from a data array.
4.Forms & Performance — handling form submission with validation, plus batching and debouncing for fast, responsive apps.

Work through the chapters in order — each one builds on the last, and the live to-do demo in Chapter 3 lets you run the concepts for real.