getElementsByClassName

getElementsByClassName is a JavaScript method that returns a live HTMLCollection of elements with a specified class name. It is part of the Document Object Model (DOM) API and allows developers to select and manipulate multiple elements on a web page based on their CSS class. This method is commonly used for dynamic content updates, styling changes, and event handling in web development.

Also known as: getElementsByClassName(), getElementsByClass, getElementsByClassname, getElementsByClassName method, DOM getElementsByClassName

Why learn getElementsByClassName?

Developers should use getElementsByClassName when they need to efficiently select and work with groups of elements that share a common class, such as updating all buttons with a specific style or iterating through form inputs. It is particularly useful in scenarios where you want to apply changes to multiple elements without individually targeting each one, making it ideal for tasks like toggling visibility, adding event listeners, or modifying attributes in bulk.

Learning Resources

• docs: MDN Web Docs: getElementsByClassName
• tutorial: W3Schools: getElementsByClassName() Method
• video: JavaScript DOM Tutorial - getElementsByClassName
• book: Eloquent JavaScript - Chapter 14: The Document Object Model
• course: freeCodeCamp: JavaScript DOM Manipulation Course