use IIFE in app.html to prevent FOUC

This commit is contained in:
Danny Liu 2024-03-17 00:25:33 -07:00
parent 41cb6d7a54
commit a57586a2b7

View file

@ -8,34 +8,36 @@
<meta name="robots" content="noindex,nofollow" />
<script>
// On page load or when changing themes, best to add inline in `head` to avoid FOUC
if (
localStorage.theme === 'light' ||
(!('theme' in localStorage) && window.matchMedia('(prefers-color-scheme: light)').matches)
) {
document.documentElement.classList.add('light');
} else if (localStorage.theme && localStorage.theme !== 'system') {
localStorage.theme.split(' ').forEach((e) => {
document.documentElement.classList.add(e);
});
} else if (localStorage.theme && localStorage.theme === 'system') {
systemTheme = window.matchMedia('(prefers-color-scheme: dark)').matches;
document.documentElement.classList.add(systemTheme ? 'dark' : 'light');
}
else {
document.documentElement.classList.add('dark');
}
window.matchMedia('(prefers-color-scheme: dark)').addListener((e) => {
if (localStorage.theme === 'system') {
if (e.matches) {
document.documentElement.classList.add('dark');
document.documentElement.classList.remove('light');
} else {
document.documentElement.classList.add('light');
document.documentElement.classList.remove('dark');
}
(() => {
if (
localStorage.theme === 'light' ||
(!('theme' in localStorage) && window.matchMedia('(prefers-color-scheme: light)').matches)
) {
document.documentElement.classList.add('light');
} else if (localStorage.theme && localStorage.theme !== 'system') {
localStorage.theme.split(' ').forEach((e) => {
document.documentElement.classList.add(e);
});
} else if (localStorage.theme && localStorage.theme === 'system') {
systemTheme = window.matchMedia('(prefers-color-scheme: dark)').matches;
document.documentElement.classList.add(systemTheme ? 'dark' : 'light');
}
});
else {
document.documentElement.classList.add('dark');
}
window.matchMedia('(prefers-color-scheme: dark)').addListener((e) => {
if (localStorage.theme === 'system') {
if (e.matches) {
document.documentElement.classList.add('dark');
document.documentElement.classList.remove('light');
} else {
document.documentElement.classList.add('light');
document.documentElement.classList.remove('dark');
}
}
});
})();
</script>
%sveltekit.head%