DOM

This tutorial shows you how to select elements by name using the JavaScript getElementsByName() method

This tutorial shows you how to detect if the caps lock is on using JavaScript DOM API.

This tutorial shows you how to get the scrollbar width of an element in JavaScript.

This tutorial shows you how to stop the propagation of an event in both capturing and bubbling phases using the Event.stopPropagation() method.

This tutorial shows you how to prevent the default action of an event by using the preventDefault() method of the Event object.

In this tutorial, you’ll learn how to check if an element is visible in the viewport using JavaScript.

This tutoial shows you how to check if the document is ready using vanilla JavaScript.

This tutorial shows you how to use the addEventListener() method to create a one-off event handler that execute only once when the event occurs for the first time.

This tutorial shows you how to use the removeEventListener() method to remove an event handler from an event of an element.

This tutorial shows you how to attach an event handler to an event of an element in JavaScript.

This tutorial shows you how to detect if an element has the focus.

This tutorial shows you how to trigger an event on an element programmatically using JavaScript DOM API.

This tutorial shows you how to replace a class with a new one using JavaScript DOM API.

This tutorial shows you how to check if an element contains a specific class using JavaScript DOM API.

This tutorial shows you how toggle a class of an element using the JavaScript DOM API.

This tutorial shows you how to remove one or more classes from an element using JavaScript DOM API.

This tutorial shows you how to add one or more classes to an element in JavaScript

This tutorial shows you how to get the width and height of an element using JavaScript DOM API.

To get the top/left coordinates of an element relative to its parent, you use the offsetLeft and offsetTop properties. The return values are in px:

This tutorial shows you how to get the width and height of the window in JavaScript