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chore: Fix to persist the theme preference across page navigation. (#1974)

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# What does this PR do?
This PR persists the theme preference across page navigation.

Currently, if the default theme is detected, it is used. 

But if a user flips **_the default theme_** and goes to a new page, the
theme will switch back to the default.

This resolves that issue.

## Test Plan
[Describe the tests you ran to verify your changes with result
summaries. *Provide clear instructions so the plan can be easily
re-executed.*]

[//]: # (## Documentation)

Signed-off-by: Francisco Javier Arceo <farceo@redhat.com>
This commit is contained in:
Francisco Arceo 2025-04-16 14:58:25 -06:00 • committed by GitHub
parent b5a9ef4c6d
commit 00b232c282
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1 changed files with 26 additions and 3 deletions
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29
docs/_static/js/detect_theme.js vendored
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@ -1,9 +1,32 @@
document.addEventListener("DOMContentLoaded", function () {
const prefersDark = window.matchMedia("(prefers-color-scheme: dark)").matches;
const htmlElement = document.documentElement;
if (prefersDark) {
htmlElement.setAttribute("data-theme", "dark");
// Check if theme is saved in localStorage
const savedTheme = localStorage.getItem("sphinx-rtd-theme");
if (savedTheme) {
// Use the saved theme preference
htmlElement.setAttribute("data-theme", savedTheme);
document.body.classList.toggle("dark", savedTheme === "dark");
} else {
htmlElement.setAttribute("data-theme", "light");
// Fall back to system preference
const theme = prefersDark ? "dark" : "light";
htmlElement.setAttribute("data-theme", theme);
document.body.classList.toggle("dark", theme === "dark");
// Save initial preference
localStorage.setItem("sphinx-rtd-theme", theme);
}
// Listen for theme changes from the existing toggle
const observer = new MutationObserver(function(mutations) {
mutations.forEach(function(mutation) {
if (mutation.attributeName === "data-theme") {
const currentTheme = htmlElement.getAttribute("data-theme");
localStorage.setItem("sphinx-rtd-theme", currentTheme);
}
});
});
observer.observe(htmlElement, { attributes: true });
});