How Can I Accurately Get Device Screen Width Using JavaScript?

Obtain Accurate Device Width Measurements with JavaScript

When tailoring web applications to different device sizes, obtaining the device's actual screen width is crucial. While CSS offers media queries with the max-device-width property, JavaScript lacks a direct equivalent to retrieve this information.

Viewport Width Limitations

JavaScript bindings often rely on testing the viewport width, which can result in inaccurate results for devices in landscape orientation, as they display a wider available area. This limitation necessitates additional checks, compromising code elegance.

Solution: Screen Width Property

To accurately determine the device's screen width, JavaScript provides the screen.width property. This value represents the visible screen space, excluding scrollbars and other browser elements.

Cross-Platform Considerations

In some cases, window.innerWidth may be more appropriate, particularly for desktop browsers where the window size differs from the device screen size. To cater to all platforms, it is recommended to utilize the following conditional:

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

This approach assigns the actual device width to the width variable if window.innerWidth is defined, otherwise it uses screen.width as a fallback.

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