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fix(theme-toggle): quick flash (light/dark) (#768)

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* fix(theme-toggle): quick flash (light/dark)

* chore: simplify

* chore: simplify

* chore: simplify
This commit is contained in:
Ludovic Fernandez
2025-08-21 01:33:24 +02:00
committed by GitHub
parent 18a9335d4b
commit 201ce3f763
2 changed files with 24 additions and 33 deletions
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37
assets/js/theme.js
View File

@@ -1,49 +1,22 @@
// Light / Dark theme toggle
(function () {
const defaultTheme = '{{ site.Params.theme.default | default `system`}}'
const themes = ["light", "dark"];
const themeToggleButtons = document.querySelectorAll(".hextra-theme-toggle");
const themeToggleOptions = document.querySelectorAll(".hextra-theme-toggle-options p");
function setSystemTheme() {
const prefersColorScheme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
document.documentElement.classList.remove("dark", "light");
document.documentElement.classList.add(prefersColorScheme);
document.documentElement.style.colorScheme = prefersColorScheme;
}
function applyTheme(theme) {
theme = themes.includes(theme) ? theme : "system";
themeToggleButtons.forEach((btn) => btn.parentElement.dataset.theme = theme );
localStorage.setItem("color-theme", theme);
}
function switchTheme(theme) {
switch (theme) {
case "light":
document.documentElement.classList.remove("dark");
document.documentElement.classList.add(theme);
document.documentElement.style.colorScheme = theme;
setTheme(theme);
applyTheme(theme);
break;
case "dark":
document.documentElement.classList.remove("light");
document.documentElement.classList.add(theme);
document.documentElement.style.colorScheme = theme;
applyTheme(theme);
break;
default:
setSystemTheme();
applyTheme("system");
break;
}
}
const colorTheme = "color-theme" in localStorage ? localStorage.getItem("color-theme") : defaultTheme;
@@ -112,7 +85,7 @@
// Listen for system theme changes
window.matchMedia("(prefers-color-scheme: dark)").addEventListener("change", () => {
if (localStorage.getItem("color-theme") === "system") {
setSystemTheme();
setTheme("system");
}
});
})();

18
layouts/_partials/head.html
View File

@@ -59,6 +59,24 @@
{{ partial "google-analytics.html" . -}}
{{- end }}
<script>
// The section must not be in the theme.js file because it can create a quick flash (switch between light and dark).
function setTheme(theme) {
document.documentElement.classList.remove("light", "dark");
if (theme !== "light" && theme !== "dark") {
theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";
}
document.documentElement.classList.add(theme);
document.documentElement.style.colorScheme = theme;
}
setTheme("color-theme" in localStorage ? localStorage.getItem("color-theme") : '{{ site.Params.theme.default | default `system`}}')
</script>
<!-- Math engine -->
{{ $noop := .WordCount -}}
{{- $engine := site.Params.math.engine | default "katex" -}}