fix: auto theme does not update when OS switches day/night mode#12278
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wanghe-fit2cloud merged 1 commit into1Panel-dev:dev-v2from Mar 23, 2026
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…l-dev#6813) When theme is set to "auto" (follow system), changing the OS from light to dark (or vice versa) without reloading the page had no effect. The theme was only evaluated once on page load. Added a matchMedia 'change' event listener that calls switchTheme() whenever the OS color scheme changes, but only when theme is "auto". Listener is properly cleaned up on component unmount. Fixes 1Panel-dev#6813 (point 1)
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HynoR
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Mar 29, 2026
…l-dev#6813) (1Panel-dev#12278) When theme is set to "auto" (follow system), changing the OS from light to dark (or vice versa) without reloading the page had no effect. The theme was only evaluated once on page load. Added a matchMedia 'change' event listener that calls switchTheme() whenever the OS color scheme changes, but only when theme is "auto". Listener is properly cleaned up on component unmount. Fixes 1Panel-dev#6813 (point 1)
justadri
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Mar 29, 2026
…l-dev#6813) (1Panel-dev#12278) When theme is set to "auto" (follow system), changing the OS from light to dark (or vice versa) without reloading the page had no effect. The theme was only evaluated once on page load. Added a matchMedia 'change' event listener that calls switchTheme() whenever the OS color scheme changes, but only when theme is "auto". Listener is properly cleaned up on component unmount. Fixes 1Panel-dev#6813 (point 1)
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Summary
Fixes #6813 (point 1) - When theme is set to "auto" (follow system), the panel doesn't switch between dark/light mode when the OS changes without a page reload.
Root Cause
useTheme()infrontend/src/global/use-theme.tsonly evaluateswindow.matchMedia('(prefers-color-scheme: dark)').matcheswhenswitchTheme()is explicitly called. No listener is registered for thechangeevent on the media query.Fix
Added
matchMedia.addEventListener('change', ...)that callsswitchTheme()when the OS color scheme changes, but only when the theme setting is"auto". Listener is cleaned up viaonUnmounted.Changed file
frontend/src/global/use-theme.ts(+14)