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JAVASCRIPT Snippets.

Toggle CSS Class for Dynamic Styling

Learn to dynamically add or remove CSS classes from DOM elements using JavaScript's classList API for interactive UI updates and state management.

Create and Append New DOM Elements

Discover how to programmatically create new HTML elements and append them to an existing parent element in the DOM using createElement and appendChild.

Insert Elements Before or After Others

Master precise DOM element insertion using insertBefore and insertAdjacentElement to place new elements relative to existing ones, controlling their position.

Validate URLs with a Comprehensive Regex

Implement a JavaScript regex pattern to validate various URL formats, including HTTP/HTTPS protocols, domains, ports, paths, and query parameters.

Enforce Strong Passwords with Regex

Validate password strength in JavaScript using regex to ensure it contains a mix of uppercase, lowercase, numbers, and special characters, meeting minimum length requirements.

Extract Hashtags from Text using Regex

Discover how to efficiently extract all hashtags (words prefixed with '#') from a given text string in JavaScript using a simple and effective regular expression.

Sanitize Input: Remove Special Characters

Learn to sanitize user input in JavaScript by removing all non-alphanumeric characters, making the text safe for display or further processing.

Efficiently Debounce React State Updates

Optimize performance by debouncing any value in React, preventing excessive re-renders or API calls for rapidly changing inputs like search queries.

Persist React State with Local Storage

Store and retrieve React state automatically from the browser's local storage, ensuring data persistence across page refreshes and browser sessions for user settings or preferences.

Track Previous Values of Props or State in React

Get access to the previous value of any prop or state in a React component, useful for comparing current and past states or triggering effects based on changes.

Detect Clicks Outside a React Element

Implement logic to detect when a user clicks outside a specific React component, perfect for closing modals, dropdowns, or popovers when the focus is lost.

Detect Element Visibility with Intersection Observer

Easily detect when a React element enters or exits the viewport using the Intersection Observer API, enabling lazy loading, infinite scrolling, and "in-view" animations.