@automattic/viewport v1.1.0

viewport

This package contains functions to identify and track changes to the viewport. This can be used for displaying different components depending on a desktop or mobile view.

For React helpers, please check the @automattic/viewport-react package.

Usage

Simple usage:

import { isDesktop, isMobile } from '@automattic/viewport';

if ( isDesktop() ) {
	// Render a component optimized for desktop view
} else if ( isMobile() ) {
	// Render a component optimized for mobile view
}

Using one of the other breakpoints:

import { isWithinBreakpoint } from '@automattic/viewport';

if ( isWithinBreakpoint( '>1400px' ) ) {
	// Render a component optimized for a very large screen
} else {
	// Render alternative component
}

Registering to listen to changes, using vanilla methods:

import { subscribeIsDesktop } from '@automattic/viewport';

class MyComponent extends React.Component {
	sizeChanged = matches => {
		console.log(
			`Screen changed to ${ matches ? 'desktop' : 'non-desktop' } size` );
		this.forceUpdate();
	};

	componentDidMount() {
		this.unsubscribe = subscribeIsDesktop( this.sizeChanged );
	}

	componentWillUnmount() {
		this.unsubscribe();
	}
}

Note: the above usage is more easily accomplished using the hooks and higher-order components in @automattic/viewport-react.

Supported methods

• isWithinBreakpoint( breakpoint ): Whether the current screen size matches the breakpoint.
• isMobile(): Whether the current screen size matches a mobile breakpoint (equivalent to "<480px"). See note at end of document.
• isDesktop(): Whether the current screen size matches a desktop breakpoint (equivalent to ">960px"). See note at end of document.
• subscribeIsWithinBreakpoint( breakpoint, listener ): Register a listener for size changes that affect the breakpoint. Returns the unsubscribe function.
• subscribeIsMobile( listener ): Register a listener for size changes that affect the mobile breakpoint (equivalent to "<480px"). Returns the unsubscribe function. See note at end of document.
• subscribeIsDesktop( listener ): Register a listener for size changes that affect the desktop breakpoint (equivalent to ">960px"). Returns the unsubscribe function. See note at end of document.
• getWindowInnerWidth(): Get the inner width for the browser window. Warning: This method triggers a layout recalc, potentially resulting in performance issues. Please use a breakpoint instead wherever possible.

Supported breakpoints

• '<480px'
• '<660px'
• '<800px'
• '<960px'
• '<1040px'
• '<1280px'
• '<1400px'
• '>480px'
• '>660px'
• '>800px'
• '>960px'
• '>1040px'
• '>1280px'
• '>1400px'
• '480px-660px'
• '480px-960px'
• '660px-960px'

Note: As implemented in Calypso media query mixins, minimums are exclusive, while maximums are inclusive. i.e.:

• '>480px' is equivalent to @media (min-width: 481px)
• '<960px' is equivalent to @media (max-width: 960px)
• '480px-960px' is equivalent to @media (max-width: 960px) and (min-width: 481px)