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color-scheme and media-screen
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| window.addEventListener('load', () => { | |
| const html = document.documentElement, | |
| button = document.createElement('button'), | |
| light = '🔆', | |
| dark = '🌙'; | |
| let styles = { | |
| position: 'absolute', | |
| top: '2px', | |
| right: '2px', | |
| zIndex: 99, | |
| width: '20px', | |
| height: '20px', | |
| cursor: 'pointer', | |
| userSelect: 'none', | |
| outline: 'none', | |
| border: 'none', | |
| padding: 0, | |
| borderRadius: '5px', | |
| fontSize: '14px', | |
| lineHeight: '1.3', | |
| textAlign: 'center', | |
| backgroundColor: 'rgba(200,200,200,0.3)', | |
| }; | |
| for (let key in styles) { | |
| button.style[key] = styles[key]; | |
| } | |
| if ( | |
| localStorage['color-scheme'] === 'dark' || | |
| (!('color-scheme' in localStorage) && | |
| window.matchMedia('(prefers-color-scheme: dark)').matches) | |
| ) { | |
| button.innerText = dark; | |
| html.classList.add('dark'); | |
| } else { | |
| button.innerText = light; | |
| html.classList.remove('dark'); | |
| } | |
| button.addEventListener('click', (event) => { | |
| event.preventDefault(); | |
| if ( | |
| localStorage['color-scheme'] === 'dark' || | |
| (!('color-scheme' in localStorage) && | |
| window.matchMedia('(prefers-color-scheme: dark)').matches) | |
| ) { | |
| button.innerText = light; | |
| html.classList.remove('dark'); | |
| localStorage.setItem('color-scheme', 'light'); | |
| } else { | |
| button.innerText = dark; | |
| html.classList.add('dark'); | |
| localStorage.setItem('color-scheme', 'dark'); | |
| } | |
| }); | |
| // Whenever the user explicitly chooses to respect the OS preference | |
| // localStorage.removeItem('color-scheme') | |
| html.appendChild(button); | |
| }); |
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