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Ensure Tailwind dark: variant works with system theme #6675

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Ensure Tailwind dark: variant works with system theme #6675

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2 changes: 1 addition & 1 deletion installer/templates/phx_web/components/layouts.ex.eex
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Original file line number Diff line number Diff line change
Expand Up @@ -129,7 +129,7 @@ defmodule <%= @web_namespace %>.Layouts do
def theme_toggle(assigns) do
~H"""
<div class="card relative flex flex-row items-center border-2 border-base-300 bg-base-300 rounded-full">
<div class="absolute w-1/3 h-full rounded-full border-1 border-base-200 bg-base-100 brightness-200 left-0 [[data-theme=light]_&]:left-1/3 [[data-theme=dark]_&]:left-2/3 transition-[left]" />
<div class="absolute w-1/3 h-full rounded-full border-1 border-base-200 bg-base-100 brightness-200 left-0 [[data-theme=light]_&]:left-1/3 [[data-theme=dark]_&]:left-2/3 [[data-theme-source=system]_&]:!left-0 transition-[left]" />

<button
class="flex p-2 cursor-pointer w-1/3"<%= if @live do %>
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12 changes: 11 additions & 1 deletion installer/templates/phx_web/components/layouts/root.html.heex.eex
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Original file line number Diff line number Diff line change
Expand Up @@ -11,13 +11,17 @@
</script><%= if @css do %>
<script>
(() => {
const systemTheme = () => matchMedia("(prefers-color-scheme: dark)").matches ? "dark" : "light";

const setTheme = (theme) => {
if (theme === "system") {
localStorage.removeItem("phx:theme");
document.documentElement.removeAttribute("data-theme");
document.documentElement.setAttribute("data-theme", systemTheme());
document.documentElement.setAttribute("data-theme-source", "system");
} else {
localStorage.setItem("phx:theme", theme);
document.documentElement.setAttribute("data-theme", theme);
document.documentElement.setAttribute("data-theme-source", "user");
}
};
if (!document.documentElement.hasAttribute("data-theme")) {
Expand All @@ -35,6 +39,12 @@
})
})<% else %>
window.addEventListener("phx:set-theme", (e) => setTheme(e.target.dataset.phxTheme));<% end %>

matchMedia("(prefers-color-scheme: dark)").addEventListener("change", (e) => {
if (document.documentElement.getAttribute("data-theme-source") === "system") {
document.documentElement.setAttribute("data-theme", systemTheme());
}
});
})();
</script><% end %>
</head>
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