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webapp: implement color mode switcher
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,37 @@ | ||
| 'use strict' | ||
| /* eslint-env browser */ | ||
|
|
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| /** | ||
| * Get user preferred theme from their past choice or browser | ||
| * @returns {String} User preferred theme | ||
| */ | ||
| function getPreferredTheme () { | ||
| const storedTheme = localStorage.getItem('theme') | ||
| if (storedTheme) { | ||
| return storedTheme | ||
| } | ||
| // Privacy-hardened browsers always return light | ||
| return window.matchMedia('(prefers-color-scheme: dark)').matches ? 'dark' : 'light' | ||
| } | ||
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| // Change body theme early to prevent flash | ||
| let currentTheme = getPreferredTheme() | ||
| document.documentElement.setAttribute('data-bs-theme', currentTheme) | ||
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| // On browser color-scheme change, update | ||
| window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', () => { | ||
| currentTheme = getPreferredTheme() | ||
| document.documentElement.setAttribute('data-bs-theme', currentTheme) | ||
| }) | ||
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| window.addEventListener('load', () => { | ||
| // Toggle on T key, ignore input fields or key repeat | ||
| document.addEventListener('keydown', e => { | ||
| if (e.target.tagName !== 'INPUT' && !e.repeat && !e.ctrlKey && e.key === 't') { | ||
| currentTheme = currentTheme === 'light' ? 'dark' : 'light' | ||
| document.documentElement.setAttribute('data-bs-theme', currentTheme) | ||
| localStorage.setItem('theme', currentTheme) | ||
| e.preventDefault() | ||
| } | ||
| }) | ||
| }) |
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