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Keep Screen Awake

Keep screen awake toggle via Tampermonkey menu

  1. // ==UserScript==
  2. // @name         Keep Screen Awake
  3. // @namespace    YMHOMER
  4. // @version      1.0
  5. // @description  Keep screen awake toggle via Tampermonkey menu
  6. // @match        *://*/*
  7. // @grant        GM_registerMenuCommand
  8. // @run-at       document-idle
  9. // @license MIT
  10. // ==/UserScript==
  11.  
  12. (function() {
  13.     'use strict';
  14.  
  15.     let keepAwake = false;
  16.     let wakeLock = null;
  17.  
  18.     async function toggleKeepAwake() {
  19.         if (!keepAwake) {
  20.             try {
  21.                 wakeLock = await navigator.wakeLock.request('screen');
  22.                 keepAwake = true;
  23.                 alert('Keep Screen Awake - ON');
  24.             } catch (err) {
  25.                 console.error('Keep Screen Awake - failed:', err);
  26.                 alert('Keep Screen Awake - failed');
  27.             }
  28.         } else {
  29.             if (wakeLock) {
  30.                 wakeLock.release().then(() => {
  31.                     wakeLock = null;
  32.                     keepAwake = false;
  33.                     alert('Keep Screen Awake - Off');
  34.                 });
  35.             }
  36.         }
  37.     }
  38.  
  39.     if (typeof GM_registerMenuCommand === 'function') {
  40.         GM_registerMenuCommand('Turn ON - Keep Screen Awake', toggleKeepAwake);
  41.     } else {
  42.         alert("GM_registerMenuCommand error");
  43.     }
  44. })();