screenfull

What is screenfull?

The screenfull npm package is a simple wrapper for cross-browser usage of the JavaScript Fullscreen API, which allows web pages to display web content in full-screen mode, exiting this mode, and toggling between these states. It abstracts away the differences between various browsers' implementations of the Fullscreen API, providing a consistent and easy-to-use interface for developers.

What are screenfull's main functionalities?

Toggle Fullscreen

This feature allows you to toggle fullscreen mode on and off for the page or a specific element. The code checks if fullscreen is supported and enabled, then toggles the fullscreen state.

if (screenfull.isEnabled) {
  screenfull.toggle();
}

Enter Fullscreen

This feature enables entering fullscreen mode. The code sample demonstrates how to request the browser to enter fullscreen mode if it is supported.

if (screenfull.isEnabled) {
  screenfull.request();
}

Exit Fullscreen

This feature allows you to exit fullscreen mode programmatically. The code checks if fullscreen is enabled and then exits fullscreen mode.

if (screenfull.isEnabled) {
  screenfull.exit();
}

Fullscreen Change Event

This feature allows you to listen for changes in the fullscreen state. The code sample demonstrates how to register an event listener that logs the current fullscreen state whenever it changes.

if (screenfull.isEnabled) {
  screenfull.on('change', () => {
    console.log('Am I fullscreen?', screenfull.isFullscreen ? 'Yes' : 'No');
  });
}

Other packages similar to screenfull

fscreen

fscreen is another abstraction library for the Fullscreen API, similar to screenfull. It provides a unified API for using the Fullscreen API across different browsers. Compared to screenfull, fscreen sticks closely to the original Fullscreen API specification, offering a more minimalistic approach.

bigscreen

bigscreen is a library that offers similar functionality to screenfull, with additional features such as the ability to use fullscreen on multiple monitors and more detailed event handling. It provides a more comprehensive solution for complex fullscreen scenarios but might be overkill for simple use cases.

README

screenfull.js

Simple wrapper for cross-browser usage of the JavaScript Fullscreen API, which lets you bring the page or any element into fullscreen. Smoothens out the browser implementation differences, so you don't have to.

This package is feature complete. No new changes will be accepted.

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Demo

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Install

Only 0.7 kB gzipped.

Download the production version or the development version.

$ npm install screenfull

Also available on cdnjs.

Why?

Screenfull

if (screenfull.enabled) {
	screenfull.request();
}

Vanilla JavaScript

document.fullscreenEnabled = document.fullscreenEnabled || document.mozFullScreenEnabled || document.documentElement.webkitRequestFullScreen;

function requestFullscreen(element) {
	if (element.requestFullscreen) {
		element.requestFullscreen();
	} else if (element.mozRequestFullScreen) {
		element.mozRequestFullScreen();
	} else if (element.webkitRequestFullScreen) {
		element.webkitRequestFullScreen(Element.ALLOW_KEYBOARD_INPUT);
	}
}

if (document.fullscreenEnabled) {
	requestFullscreen(document.documentElement);
}

// Actually it's more if you want it to work in Safari, but let's not go there...

Support

Supported browsers

Note: In order to use this package in Internet Explorer, you need a Promise polyfill.

Documentation

Examples

Fullscreen the page

document.getElementById('button').addEventListener('click', () => {
	if (screenfull.enabled) {
		screenfull.request();
	} else {
		// Ignore or do something else
	}
});

Fullscreen an element

const el = document.getElementById('target');

document.getElementById('button').addEventListener('click', () => {
	if (screenfull.enabled) {
		screenfull.request(el);
	}
});

Fullscreen an element with jQuery

const target = $('#target')[0]; // Get DOM element from jQuery collection

$('#button').on('click', () => {
	if (screenfull.enabled) {
		screenfull.request(target);
	}
});

Toggle fullscreen on a image with jQuery

$('img').on('click', event => {
	if (screenfull.enabled) {
		screenfull.toggle(event.target);
	}
});

Detect fullscreen change

if (screenfull.enabled) {
	screenfull.on('change', () => {
		console.log('Am I fullscreen?', screenfull.isFullscreen ? 'Yes' : 'No');
	});
}

Remove listeners with:

screenfull.off('change', callback);

Detect fullscreen error

if (screenfull.enabled) {
	screenfull.on('error', event => {
		console.error('Failed to enable fullscreen', event);
	});
}

See the demo for more examples, and view the source.

Fullscreen an element with Angular.js

You can use the Angular.js binding to do something like:

<div ngsf-fullscreen>
	<p>This is a fullscreen element</p>
	<button ngsf-toggle-fullscreen>Toggle fullscreen</button>
</div>

Fullscreen the page with Angular 2

import {Directive, HostListener} from '@angular/core';
import * as screenfull from 'screenfull';

@Directive({
	selector: '[toggleFullscreen]'
})
export class ToggleFullscreenDirective {
	@HostListener('click') onClick() {
		if (screenfull.enabled) {
			screenfull.toggle();
		}
	}
}

<button toggleFullscreen>Toggle fullscreen<button>

Methods

.request()

Make an element fullscreen.

Accepts a DOM element. Default is <html>. If called with another element than the currently active, it will switch to that if it's a decendant.

If your page is inside an <iframe> you will need to add a allowfullscreen attribute (+ webkitallowfullscreen and mozallowfullscreen).

Keep in mind that the browser will only enter fullscreen when initiated by user events like click, touch, key.

Returns a promise that resolves after the element enters fullscreen.

.exit()

Brings you out of fullscreen.

Returns a promise that resolves after the element exits fullscreen.

.toggle()

Requests fullscreen if not active, otherwise exits.

Returns a promise that resolves after the element enters/exits fullscreen.

.on(event, function)

Events: change error

Add a listener for when the browser switches in and out of fullscreen or when there is an error.

.off(event, function)

Remove a previously registered event listener.

.onchange(function)

Alias for .on('change', function)

.onerror(function)

Alias for .on('error', function)

Properties

.isFullscreen

Returns a boolean whether fullscreen is active.

.element

Returns the element currently in fullscreen, otherwise null.

.enabled

Returns a boolean whether you are allowed to enter fullscreen. If your page is inside an <iframe> you will need to add a allowfullscreen attribute (+ webkitallowfullscreen and mozallowfullscreen).

.raw

Exposes the raw properties (prefixed if needed) used internally: requestFullscreen, exitFullscreen, fullscreenElement, fullscreenEnabled, fullscreenchange, fullscreenerror

FAQ

How can I navigate to a new page when fullscreen?

That's not supported by browsers for security reasons. There is, however, a dirty workaround. Create a seamless iframe that fills the screen and navigate to the page in that instead.

$('#new-page-btn').click(() => {
	const iframe = document.createElement('iframe')

	iframe.setAttribute('id', 'external-iframe');
	iframe.setAttribute('src', 'http://new-page-website.com');
	iframe.setAttribute('frameborder', 'no');
	iframe.style.position = 'absolute';
	iframe.style.top = '0';
	iframe.style.right = '0';
	iframe.style.bottom = '0';
	iframe.style.left = '0';
	iframe.style.width = '100%';
	iframe.style.height = '100%';

	$(document.body).prepend(iframe);
	document.body.style.overflow = 'hidden';
});

Resources

• Using the Fullscreen API in web browsers
• MDN - Fullscreen API
• W3C Fullscreen spec
• Building an amazing fullscreen mobile experience

License

MIT © Sindre Sorhus