js computed style

What is JS Computed Style?

JS Computed Style is a method in JavaScript which allows developers to get the final computed style of an element. This includes all styles applied to an element, including those inherited from parent elements, and those set by inline styles or stylesheets.

How to use JS Computed Style?

To use JS Computed Style, first select the element you want to get the style of, either by using document.getElementBy[...]() or by creating a reference to the element. Once you have selected the element, use the window.getComputedStyle() method to get its computed style.

// Select element
let myElement = document.querySelector('#my-element');

// Get computed style
let myStyle = window.getComputedStyle(myElement);

You can then access individual styles using myStyle.[style property], for example:

// Get width
let width = myStyle.width;

Note that the style property names are in camelCase format, rather than hyphen-separated format, for example:

// Get background color
let bgColor = myStyle.backgroundColor;

Alternative Method:

An alternative method for getting computed style is to use the element.currentStyle property, which is specific to Internet Explorer. This method works in a similar way to window.getComputedStyle(), but returns the computed style as an object with property names in hyphen-separated format, rather than camelCase format.

// Select element
let myElement = document.querySelector('#my-element');

// Get computed style
let myStyle = myElement.currentStyle;

You can then access individual styles using myStyle.[hyphen-separated property], for example:

// Get width
let width = myStyle.width;

Conclusion:

JS Computed Style is a powerful tool for developers who need to access computed styles of elements in their web applications. By using window.getComputedStyle() or element.currentStyle, they can get the final styles applied to an element, and use them to create dynamic, responsive web designs.