// Tutorial //

clientWidth and clientHeight in JavaScript

Published on July 24, 2019
Default avatar
By William Le
Developer and author at DigitalOcean.
clientWidth and clientHeight in JavaScript

While we believe that this content benefits our community, we have not yet thoroughly reviewed it. If you have any suggestions for improvements, please let us know by clicking the “report an issue“ button at the bottom of the tutorial.

Using clientWidth and clientHeight you’re able to get the pixel dimensions of an HTML element. The dimensions are calculated using the dimensions of content inside the HTML element, along with the padding.

Note: Borders, margins, or scrollbars (if present) are excluded when computing clientWidth and clientHeight

Using clientWidth and clientHeight

<div id="foo">
  Hello World
</div>
const clientWidth = document.querySelector('#foo').clientWidth;
const clientHeight = document.querySelector('#foo').clientHeight;

Learning Exercises

As an exercise, try calculating the value of clientWidth and clientHeight of the following HTML element:

clientwidth clientheight example 1

/**********************************************
 **  If the HTML element is <div id="foo"/>  **
 **********************************************/
const clientWidth = document.querySelector('div#foo').clientWidth;
const clientHeight = document.querySelector('div#foo').clientHeight;
console.log(clientWidth, clientHeight);
// --> 200, 100

How was it calculated? Add the padding, with the content inside the HTML element, and ignore the margins and borders:

clientwidth clientheight example 2

(10 + 50) + 140   // clientWidth === 200
(30) + 70         // clientHeight === 100

Let’s try another! Try calculating the clientWidth and clientHeight of this HTML element:

clientwidth clientheight example 3

(10 + 10) + 230   // clientWidth === 250
(30 + 20) + 70    // clientHeight === 120

Notes

  • Block-level: clientWidth and clientHeight does NOT work with inline HTML elements (like span, em, or a). It’ll just return 0!
  • Rounded Values: Values are rounded to the nearest integer. If you need more precise values use getBoundingClientRect()
  • Read-Only: You can’t assign a new value to change the dimensions of the HTML element. For example this doesn’t do anything: someElement.clientWidth = 30

clientWidth and clientHeight are supported on all major desktop and mobile browsers.

See the official W3C specs for detailed information about clientWidth and clientHeight.


Want to learn more? Join the DigitalOcean Community!

Join our DigitalOcean community of over a million developers for free! Get help and share knowledge in our Questions & Answers section, find tutorials and tools that will help you grow as a developer and scale your project or business, and subscribe to topics of interest.

Sign up
About the authors
Default avatar
Developer and author at DigitalOcean.

Still looking for an answer?

Was this helpful?
Leave a comment

This textbox defaults to using Markdown to format your answer.

You can type !ref in this text area to quickly search our full set of tutorials, documentation & marketplace offerings and insert the link!