How to Determine Screen Resolution with JavaScript: Window Properties and Device Pixel Ratio?

Determining Screen Resolution with JavaScript

Detecting screen resolution in JavaScript is crucial for tailoring web applications to diverse screen sizes. To achieve this, various methods exist, each with its own capabilities and limitations.

Window.screen Properties

A commonly used approach involves utilizing the window.screen object, which provides information about the available screen real estate and the absolute screen dimensions. For instance, to retrieve the maximum available height and width, you can use:

<code class="js">window.screen.availHeight
window.screen.availWidth</code>

For the absolute screen dimensions, use:

<code class="js">window.screen.height
window.screen.width</code>

Device Pixel Ratio

On mobile devices, it's essential to consider the device pixel ratio to obtain the native resolution. This ratio multiplies the available or absolute width and height to yield the native resolution:

<code class="js">window.screen.width * window.devicePixelRatio
window.screen.height * window.devicePixelRatio</code>

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