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react-browser-zoom

v0.1.3

Published

A React hook to monitor browser zoom level via devicePixelRatio.

Downloads

45

Vulnerabilities

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Links

Git

Maintainers

ars.shmelevars.shmelev

Keywords

reacthookzoombrowserdevicePixelRatioscaledpr

Readme

React Browser Zoom Listener

npm version License: MIT

A simple React hook (useBrowserZoom) to monitor browser zoom level changes by tracking window.devicePixelRatio. This version updates the value on every relevant resize event without debouncing.

Important Limitation Note

It is crucial to understand that browsers do not provide a direct, reliable, cross-browser API to get the exact UI zoom percentage set by the user (e.g., 110%, 125%).

This hook monitors window.devicePixelRatio (DPR). The DPR value reflects a combination of:

  1. Browser Zoom: The zoom level applied using Ctrl/Cmd + +/- or browser menus.
  2. Operating System Display Scaling: Scaling settings configured in the OS (e.g., 125%, 150% scaling on Windows or Retina scaling on macOS).
  3. Screen Pixel Density: The physical properties of the display (e.g., standard vs HiDPI/Retina).

Therefore, a DPR value of 1.25 could mean 125% browser zoom on a standard display with 100% OS scaling, OR it could mean 100% browser zoom on a standard display with 125% OS scaling, OR 100% browser zoom on a HiDPI display with specific scaling, etc.

Use the returned DPR value as an indicator of the effective pixel density the browser is rendering at, not as a direct measure of the user's chosen browser zoom percentage.

Installation

# Using npm
npm install react-browser-zoom

# Using Yarn
yarn add react-browser-zoom