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Introduction to jQuery

Last reviewed May 28, 2026 Content v20260528
Track mode
client_jquery
Means
In-browser jQuery
Reading
~2 min
Level
beginner

This lesson

An orientation to the jQuery track—how the playground works, vocabulary, and what you will build next.

You need a clear map of the jQuery track so hooks, state, and tooling do not feel like magic.

You will apply Introduction to jQuery in contexts like: WordPress themes, admin panels, older SPAs, and pages awaiting incremental modernization.

Write JavaScript, click Run—jQuery 3.7 loads from CDN; use mountApp(function($) { ... }) on #playground-root when the DOM is ready; printOutput feeds the terminal. Also read the interview prep blocks.

After solid JavaScript—and ideally TypeScript—before starting the jquery track.

How this jQuery track works

  • Legacy maintenance focus — jQuery 3.7 loads from CDN; learn to read and patch existing pages, not to start greenfield SPAs.
  • JavaScript playground — early lessons use printOutput(...); from dollar-sign onward use mountApp(function ($) { ... }) on #playground-root.
  • Prerequisites — finish JavaScript and HTML (DOM, events, forms) before this track.

Demo elements: #demo-btn, #demo-text, #demo-card. Use printOutput for terminal inspection.

Install on your device (macOS, Linux, Windows)

Lessons run in your browser on this site—install a modern browser and optional editor for local projects.

macOS

  1. Use Safari (preinstalled) or install Google Chrome / Firefox.
  2. Optional editor: VS Code (brew install --cask visual-studio-code).
  3. Open DevTools with ⌥⌘I (Chrome/Edge) or ⌥⌘C (Safari Web Inspector).

Linux

  1. Install Chromium or Firefox: sudo apt update && sudo apt install -y chromium-browser firefox (Debian/Ubuntu; package names vary by distro).
  2. Fedora: sudo dnf install -y chromium firefox.
  3. Optional editor: VS Code from code.visualstudio.com or sudo snap install code --classic.

Windows

  1. Install Microsoft Edge or Chrome.
  2. Optional editor: VS Code (winget install Microsoft.VisualStudioCode).
  3. Open DevTools with F12 or Ctrl+Shift+I.

Verify: Open any lesson playground and click Run—output appears without installing a compiler.

jQuery is a compact library for DOM traversal, events, effects, and Ajax. This track teaches you to maintain pages that already depend on it—not to choose jQuery for brand-new products.

How this track differs from plain JavaScript

After the JavaScript track you can select nodes and attach listeners manually. jQuery wraps those operations in a consistent API so legacy teams ship fixes faster on familiar code paths.

What you will learn

  • Selectors, traversal, attributes, and DOM insertion
  • Events—including delegation for dynamic lists
  • Effects, Ajax, forms, utilities, and plugins
  • Migration mindset toward vanilla JS or modern frameworks

Playground

jQuery 3.7 loads from CDN. Early lessons use printOutput; later lessons call mountApp(function ($) { ... }) on #playground-root with #demo-btn, #demo-text, and #demo-card.

Self-check

  1. Why is this track maintenance-first?
  2. What prerequisite tracks should you finish first?

Interview tip Lesson completion confidence

Can you explain this lesson in 30 seconds without reading notes?

Not saved yet.

Playground

Runs in your browser in a sandboxed frame. Backend runners appear when this track’s profile allows them.

Check yourself

Multiple choice — immediate feedback.

Discussion

Past discussion is visible to everyone. Only logged-in users can post comments and replies.

Starter discussion topics

  • Why learn jQuery today?
  • New project choice?

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