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visibilityChangeListener

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

Questo script non dovrebbe essere installato direttamente. È una libreria per altri script da includere con la chiave // @require https://update.greatest.deepsurf.us/scripts/480373/1283462/visibilityChangeListener.js 

  1. // ==UserScript==
  2. // @name         visibilityChangeListener
  3. // @namespace    http://tampermonkey.net/
  4. // @version      0.2
  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 visibilityChangeListener = (onFocus, onBlur, minTime = 0) => {
  11.     let lastExecutionFocusTime = 0;
  12.     let lastExecutionBlurTime = 0;
  13.  
  14.     document.addEventListener('visibilitychange', function () {
  15.         const currentTime = Date.now();
  16.  
  17.         if (document.visibilityState === 'visible') {
  18.             if (onFocus && currentTime - lastExecutionFocusTime >= minTime) {
  19.                 onFocus();
  20.                 lastExecutionFocusTime = currentTime;
  21.             }
  22.         } else if (onBlur && currentTime - lastExecutionBlurTime >= minTime) {
  23.             onBlur();
  24.             lastExecutionBlurTime = currentTime;
  25.         }
  26.     });
  27. };