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Category: JavaScript

JavaScript

Store Custom Data on DOM Elements Safely

Sergey KornilovOctober 17, 2026

Use data attributes for short public strings and a WeakMap for private objects, callbacks, and component state without modifying DOM objects.

JavaScript

Toggle a Menu Reliably with JavaScript classList

Sergey KornilovOctober 15, 2026

Keep menu state in a CSS class, update aria-expanded from the resulting state, and avoid one-time inline-style comparisons.

JavaScript

Fix GA4 When gtag.js Loads but Sends No Hits

Sergey KornilovOctober 15, 2026

Restore the standard gtag wrapper, verify command order and the measurement ID, then confirm a collection request and DebugView event.

JavaScript

Build a Custom Context Menu in JavaScript

Sergey KornilovOctober 15, 2026

Handle the contextmenu event, position an HTML menu inside the viewport, and provide an equivalent keyboard-accessible control.

JavaScript

Update CSS Attribute Selectors from JavaScript

Sergey KornilovOctober 14, 2026

Set a real data attribute on the element and match its exact serialized value with a CSS attribute selector.

JavaScript

Detect New Gamepad Button Presses in JavaScript

Sergey KornilovOctober 14, 2026

Poll the Gamepad API once per frame and compare the current button state with the previous snapshot to detect new presses.

JavaScript

Understand Why Promise Callbacks Run Before setTimeout

Sergey KornilovOctober 13, 2026

Promise reactions use the microtask queue, while setTimeout schedules a later task, so resolved promises normally run first.

JavaScript

Validate a JSON Response Field in Postman

Sergey KornilovOctober 13, 2026

Parse a Postman response once and use named pm.test assertions to verify status, structure, types, and field values.

JavaScript

Diagnose a CMS 403 Error When Saving Inline JavaScript

Sergey KornilovOctober 12, 2026

Confirm whether a web application firewall blocks a CMS save request, then use managed assets or a narrowly scoped rule exclusion.

JavaScript

Filter JavaScript Data from a Select Control

Sergey KornilovOctober 12, 2026

Read a select value in its change handler and filter an array with an explicit predicate instead of generating functions dynamically.

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