Using data-* Attributes and dataset in JavaScript
Use data attributes and dataset in JavaScript to connect HTML and behaviour cleanly, handle camelCase mapping, event delegation, and string values.
Articles
Guides, page 22 of 22
The guides are the practical part of this archive: working explanations for a specific web development problem, written to show the decision as well as the answer. The subject varies, but the aim is consistent: enough context to use the technique sensibly rather than copy it blindly.
Using data-* Attributes and dataset in JavaScript. Using
Using classList in JavaScript: add(), remove(), toggle(), and contains(). Using
classListin JavaScript:add(),remove(),toggle(), andcontains()Use classList in JavaScript for add(), remove(), toggle(), and contains(), with cleaner DOM state updates, validation examples, and className cautions.
DOMContentLoaded vs. load in JavaScript. DOMContentLoadedvs.loadin JavaScriptCompare DOMContentLoaded and load in JavaScript, including parsing, asset loading, script timing, selector failures, and when each event is useful.
Why querySelector Returns null in JavaScript. Why
querySelectorReturnsnullin JavaScriptDebug querySelector returning null in JavaScript by checking selector syntax, DOM timing, missing elements, search scope, and querySelectorAll differences.
Button vs. Link: Native Semantics Before Custom Click Handlers. Button vs. Link: Native Semantics Before Custom Click Handlers
Use links for navigation and buttons for actions, preserving native focus and keyboard behaviour before adding custom click handlers or ARIA roles.
Safe DOM Insertion and Sanitisation. Safe DOM Insertion and Sanitisation
Choose between textContent and innerHTML safely, handle Internet Explorer's innerText fallback, and know exactly when untrusted HTML needs sanitisation.
Why removeEventListener() Needs the Same Function Reference. Why
removeEventListener()Needs the Same Function ReferenceUnderstand why removeEventListener needs the original callback reference, how anonymous functions differ, and what Internet Explorer required in 2010.