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automatically set theme based on browser defaults #26

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automatically set theme based on browser defaults #26

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11 changes: 9 additions & 2 deletions src/app.html
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Original file line number Diff line number Diff line change
Expand Up @@ -15,10 +15,17 @@
/>

<script>
// Prevent flash of light theme on load :)
if (localStorage.getItem('theme') === 'dark') document.documentElement.classList.add('dark');
if (localStorage.getItem('theme') === null) {
if (window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches) {
// Prevent flash of light theme on load
document.documentElement.classList.add('dark');
}
} else if (localStorage.getItem('theme') === 'dark')
// Prevent flash of light theme on load
document.documentElement.classList.add('dark');
</script>
</head>

<body data-sveltekit-preload-data="hover">
<div style="display: contents">%sveltekit.body%</div>
</body>
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7 changes: 7 additions & 0 deletions src/lib/components/ThemeSwitch.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,13 @@
let theme = getContext<ThemeContext>('theme');

function handleClick() {
if ($theme === undefined) {
let browserDefault: 'light' | 'dark' =
window.matchMedia && window.matchMedia('(prefers-color-scheme: light)').matches
? 'light'
: 'dark';
theme.update((value) => browserDefault);
}
theme.update((value) => (value === 'dark' ? 'light' : 'dark'));
}
</script>
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14 changes: 14 additions & 0 deletions src/routes/+layout.svelte
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Original file line number Diff line number Diff line change
Expand Up @@ -21,6 +21,20 @@
} else {
document.documentElement.classList.remove('dark');
}
} else {
if (localStorage.getItem('theme') === null) {
if (window.matchMedia && window.matchMedia('(prefers-color-scheme: light)').matches) {
$theme = 'light';
} else {
$theme = 'dark';
}
} else {
if (localStorage.getItem('theme') === 'light') {
$theme = 'light';
} else {
$theme = 'dark';
}
}
}
});
</script>
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