1 files changed, 14 insertions, 0 deletions
diff --git a/static/app.js b/static/app.js
index e2da02a..4c562ff 100644
--- a/static/app.js
+++ b/static/app.js
@@ -252,8 +252,22 @@ refreshers.push(refreshTheme);
 refreshTheme();
 setInterval(refreshTheme, 5000);
 
+// Keep the tablet's screen on while the dashboard is in front, so it never
+// dims or starts its screensaver. The lock drops whenever the page is hidden
+// and is taken again when it comes back. 127.0.0.1 is a secure context, which
+// the Wake Lock API requires.
+async function keepAwake() {
+  try {
+    if (document.visibilityState === "visible") await navigator.wakeLock?.request("screen");
+  } catch {
+    // refused (battery saver): the screen just follows its own timeout
+  }
+}
+keepAwake();
+
 document.addEventListener("visibilitychange", () => {
   if (document.visibilityState === "visible") refreshers.forEach((fn) => fn());
+  keepAwake();
 });
 
 boot();