How Can I Get the Actual Device Width in JavaScript?

Determining Device Width in JavaScript

Introduction

Capturing the device's actual width, as opposed to the viewport width, is a common requirement in JavaScript development. CSS media queries provide this capability through the max-device-width property. However, bridging this functionality to JavaScript remains a challenge.

Device Width vs. Viewport Width

Viewport width pertains to the visible portion of the page within the browser window. Device width, on the other hand, represents the entire physical screen size of the device. This distinction becomes crucial when creating responsive designs, especially when catering to smartphones in landscape orientation.

JavaScript Solution

To obtain the device width in JavaScript, use the screen.width property:

var deviceWidth = screen.width;

In some cases, particularly with desktop browsers, window.innerWidth may provide a more accurate measurement:

var windowWidth = window.innerWidth;

For scenarios involving both desktop browsers and mobile devices, a comprehensive solution is to combine both measurements:

var width = (window.innerWidth > 0) ? window.innerWidth : screen.width;

This approach ensures the correct device width regardless of the device or browser type.

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