HowToCodePage

jQuery

The classic DOM and Ajax convenience library.

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This course has 3 lessons. Start with the first one and use the next / previous links at the bottom of each lesson — the sidebar keeps the whole course in order.

Lessons

  1. Selectors and traversalWhat the jQuery function really returns, how to move around the document with traversal methods, and why chaining works at all.
  2. Events, effects and attributesThe single on/off API, delegated handlers that survive re-rendering, the animation shortcuts and their queues, and the attribute helpers.
  3. AJAX helpers and why modern code moves onThe ajax family, its Deferred objects, and an honest comparison with fetch and the native APIs that replaced the rest of jQuery.

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Last refreshed 2026-09-17.