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onVisibilityChange

Waits until the tab is focused, executing a callback function when it happens.

This script should not be not be installed directly. It is a library for other scripts to include with the meta directive // @require https://update.greatest.deepsurf.us/scripts/480374/1283358/onVisibilityChange.js 

  1. // ==UserScript==
  2. // @name         onVisibilityChange
  3. // @namespace    http://tampermonkey.net/
  4. // @version      0.1
  5. // @description  Waits until the tab is focused, executing a callback function when it happens.
  6. // @author       IgnaV
  7. // @grant        none
  8. // ==/UserScript==
  9.  
  10. const onVisibilityChange = (onFocus, onBlur, minTime = 0) => {
  11.     let lastExecutionTime = 0;
  12.  
  13.     document.addEventListener('visibilitychange', function() {
  14.         const currentTime = Date.now();
  15.  
  16.         if (currentTime - lastExecutionTime >= minTime * 1000) {}
  17.             if (document.visibilityState === 'visible') {
  18.                 onFocus?.();
  19.             } else {
  20.                 onBlur?.();
  21.             }
  22.  
  23.             lastExecutionTime = currentTime;
  24.         });
  25. };