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Memorize JavaScript DOM and Event Handling: 59 Flashcards From querySelector to Event Delegation

Master the JavaScript DOM with deck PV4232: 59 cards on querySelector, bubbling vs capturing, event delegation and DocumentFragment, plus key study tips.

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The DOM is where JavaScript meets the page, and deck PV4232 – JavaScript: DOM & Event Handling covers it in 59 cards, each with a one-line example. Here's how to memorize it so the methods come out right in your editor, not just on the flip side.

Study this deck: JavaScript: DOM & Event Handling

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Sample cards

FrontBack
the DOM vs JavaScriptJavaScript is the language; the DOM is a Web API it uses. The DOM is not part of JavaScript itself
element.style vs getComputedStyle()style only reads inline styles; getComputedStyle() returns everything, stylesheets included
Event.targetThe element that triggered the event; may be a child of the element with the listener
Event.currentTargetThe element where addEventListener was called
Event delegationOne listener on a parent, using event.target to identify the child
NodeList vs HTMLCollectionNodeList can hold any node type and is usually static; HTMLCollection holds elements only and is live
Why use DocumentFragment?Batches DOM changes to minimize reflows and repaints
Window.onload vs DOMContentLoadedDOMContentLoaded fires once the DOM is parsed; load waits for images

What the 59 cards cover

Selecting: getElementById, getElementsByClassName, getElementsByTagName, querySelector, querySelectorAll, matches, closest. Building: createElement, appendChild, insertBefore, insertAdjacentHTML (beforebegin, afterbegin, beforeend, afterend), cloneNode(true), replaceChild, removeChild, remove, DocumentFragment. Content and attributes: innerHTML, textContent, getAttribute, setAttribute, classList.toggle, dataset (kebab-case to camelCase), inline style. Traversal: children vs childNodes, parentElement, nextElementSibling, firstElementChild. Events: addEventListener/removeEventListener (same function reference), preventDefault, stopPropagation, bubbling, capturing, event.key (not keyCode/which), clientX vs pageX. Extras: MutationObserver, requestAnimationFrame, getBoundingClientRect, scrollIntoView({behavior:'smooth'}).

Study tips for this deck

Learn propagation as three phases, not two cards. Cards 22 and 23 present bubbling and capturing separately. Draw one diagram instead: capture (window → target), target, bubble (target → window). Then attach target, currentTarget, stopPropagation and the third argument true (or {capture: true}) to that drawing, and cards 21-27 become a single picture.

Tag the events that don't bubble. Card 19 lists focus, blur, mouseenter and mouseleave among common events, but none of them bubble, so delegation (card 26) silently fails with them. Add one card: "Delegating focus or hover? Use focusin/focusout and mouseover/mouseout."

Two small fixes: restore the real casing on fronts like InnerHTML, AddEventListener() or GetBoundingClientRect() (it's innerHTML, addEventListener(); capitalized, they throw), and read card 57's "60fps" as "the display's refresh rate", since 120 Hz screens call requestAnimationFrame twice as often. Worth adding: the modern append, prepend, before, after, replaceWith, and a warning that innerHTML with user input opens XSS; use textContent instead.

Pair it with our JavaScript ES6+ features guide, and the markup you manipulate with HTML tags and attributes. Find PV4232 in the library on Flip It.

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